JPH10291426A - Drive unit for four-wheel drive vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive unit for a four-wheel drive vehicle which can supply lubrication oil in a cylindrical rotating body without limiting the shape of a transfer or reducing the strength of the cylindrical rotating body. SOLUTION: Lubrication oil packed in a transfer 104 is stirred when a ring gear mount case 150 is rotated and is passed through a through hole 238 and a spacer 196 to the ring gearmount case 150 from one end 140 of the spacer 196 and then is supplied to an oil seal 248 through a lubrication oil passage 254 made between the inner peripheral surface 250 of the ring gear mount case 150 and the outer peripheral surface 252 of an axle 114. This drive unit for a four-wheel drive vehicle does not need an opening for supplying lubrication oil in a ring gear mount case, which is necessary in a conventional drive unit, and hence does not limit the shape of the transfer 104 nor reduce the strength of the ring gear mount case 150.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lubrication of a drive device of a four-wheel drive vehicle for transmitting the output of an engine to front and rear axles.

[0002]

2. Description of the Related Art A drive device of a four-wheel drive vehicle for transmitting the output of an engine to front and rear axles has been known. For example, the apparatus shown in FIG. 16 is an example of such an apparatus.
It is the same as the one described in the "Toyota Starlet New Model Vehicle Manual" issued on March 31. The drive device 10 shown in FIG. 16 includes a transaxle 12 and a transfer 14. The transaxle 12 includes a parallel two-shaft manual transmission 20 having an input shaft 16 connected to a horizontal engine (not shown) and an output shaft 18 parallel to the input shaft 16, and a rotational force of the output shaft 18. A front wheel differential gear device 26 for transmitting the portion to left and right front wheels via left and right axles 22 and 24 is accommodated in a transaxle case 28 and connected to an engine block (not shown).

The transfer 14 is for transmitting the output of a laterally mounted engine to the rear wheels. One end of the transfer 14 is operatively connected to the output shaft 18 of the manual transmission 20 and the enlarged diameter portion 2 is provided.
9, a ring gear mount case 32 having a ring gear 30 integrally mounted on the outer periphery thereof, and a pinion gear 3 meshing with the ring gear 30 at an end on the vehicle front side.
4 and a pinion gear member 38 having a connecting portion 36 with a propeller shaft (not shown) formed at the rear end of the vehicle, and the ring gear mount case 32 and the pinion gear member 38 both housed around the central axis. A transfer case 40 rotatably supported and connected to the transaxle case 28, and the one axle is disposed so as to pass through the ring gear mount case 32 concentrically. Things.

[0004] One end 44 of the ring gear mount case 32 is, together with the axle 24, a rolling bearing 46.
The other end 48 is rotatably supported by the transfer case 40 by a rolling bearing 50, and the inner peripheral surface of the other end 48 is rotatably supported by the transfer case 40. Differential case 52 of front wheel differential gear device 26
Is spline-fitted to the outer peripheral surface of a cylindrical member 54 integrally provided on the right front wheel side.

[0005] Oil seals 58 and 60 are provided between through holes formed in the transaxle case 28 and the transfer case 40 and the outer peripheral surface of the cylindrical member 54, respectively. Oil seals 64 and 66 are disposed in a cylindrical space between the outer peripheral surface of the end 62 on the side of the transaxle 12 and the inner peripheral surface of the cylindrical member 54. The lubricating oil suitable for the transfer axle 12 enclosed in the transfer and the lubricating oil suitable for the transfer 14 enclosed in the transfer 14 are isolated from each other by the oil seals 64 and 66.

Incidentally, the oil seals 58, 60,
Since the oil seals 64 and 66 need to be lubricated to suppress deterioration due to sliding friction, the oil seal 58 and the oil seal 64 are
The oil seal 60 is disposed at a position where it can be easily lubricated with the lubricating oil in the transfer 14. In addition, the oil seal 66 is provided with the enlarged diameter portion 29 having an outer diameter larger than both end portions 44 and 48 of the ring gear mount case 32.
The oil is supplied to the inside of the ring gear mount case 32 through an opening 70 provided through the outer peripheral wall of the casing and reaches the oil seal 66 through a cylindrical space between the cylindrical member 54 and the axle 24. It was to be lubricated by lubricating oil.

[0007]

However, in the conventional transfer 14, the lubricating oil for lubricating the oil seal 66 is supplied to the ring gear mount case 3.
2 is provided in the enlarged diameter portion 29 of the ring gear mount case 32, so that the ring gear mount case 3
When the ring 2 is rotated, it becomes difficult for lubricating oil to enter the inside of the ring gear mount case 32 due to centrifugal force, and the lubricating oil once entered easily flows out of the ring gear mount case 32 through the opening 70. ,
There is a restriction that the transfer case 40 must be shaped so that the amount of lubricating oil supplied to the opening 70 is increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lubricating oil for lubricating an oil seal in the cylindrical shape without being restricted by the shape of the transfer. To provide a drive device for a four-wheel drive vehicle that can be supplied to the inside of the rotating body.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide an axle having one end projecting from a transfer case to the outside and the other end reaching a transaxle. A transfer housed and fixed to the transaxle, a cylindrical rotating body concentric with the axle in the transfer and rotatably supported on the outer periphery of the axle; and the axle in the transaxle. An end that is concentric and disposed on the outer periphery of the axle and protrudes into the transfer from the transaxle cannot rotate relative to the end of the cylindrical rotating body opposite to the transaxle side. A fitted cylindrical member, and an inner peripheral surface of the cylindrical member and an outer peripheral surface of the other end of the axle vertically passing through the cylindrical member. A drive device for a four-wheel drive vehicle including a lubricating oil sealed in the transfer and an oil seal sealing and isolating the lubricating oil sealed in the transaxle, wherein the lubricating oil is sealed in the transfer. A lubricating oil supply device for supplying the lubricating oil, which is swept up with the rotation of the cylindrical rotating body to the cylindrical rotating body from one end of the axle, and the cylindrical rotating body; A lubricating oil passage provided in the body, for guiding lubricating oil supplied into an end opposite to the transaxle side in the cylindrical rotating body to an end on the transaxle side. is there.

[0010]

According to the above configuration, the lubricating oil supply device is swept up by the rotation of the cylindrical rotator, and the inside of the end of the cylindrical rotator opposite to the transaxle side. The lubricating oil supplied to the transfer axle is guided to the end on the transaxle side through a lubricating oil passage provided in the cylindrical rotating body. It becomes unnecessary to provide an opening such as that provided in the diameter portion in the cylindrical rotating body, and it is possible to supply lubricating oil to the inside of the cylindrical rotating body without being restricted by the shape of the transfer. Can be. Further, the strength of the cylindrical rotating body can be improved.

[0011]

In another embodiment of the present invention, preferably, the inner peripheral surface of the cylindrical rotating body has a tapered shape in which the inner diameter is larger at one end of the axle than at one end thereof. An inner peripheral surface is provided. With this configuration, the lubricating oil is transferred to the other end side of the axle by gravity in a portion located mainly on the lower side of the space between the inner peripheral surface of the cylindrical rotating body and the axle. Therefore, there is an advantage that the oil seal can be suitably lubricated.

[0012] Preferably, the inner diameter of the cylindrical rotating body at the transaxle side end is smaller than that of the other part of the inner peripheral surface, but the axle can be penetrated. Thus, a reduced diameter portion is provided which is reduced to a diameter slightly larger than the outer diameter of the transaxle side end of the axle. With this configuration, the axle is moved from the end on the transaxle side to the cylindrical rotating body,
When the inside of the oil seal is sequentially penetrated and assembled into the transfer and the transaxle, the centering is performed in advance by the reduced diameter portion before the oil seal is penetrated, so that There is an advantage that an assembly failure in which the oil seal is damaged by the end of the axle can be eliminated.

Preferably, the reduced diameter portion is provided with a plurality of oil grooves penetrating in a direction parallel to the axial direction for transferring the lubricating oil in the axial direction of the cylindrical rotating body. It is provided at equal intervals in the circumferential direction of the radial portion. If you do this,
There is an advantage that it is possible to preferably prevent the lubricating oil from being difficult to be transferred in the axial direction of the cylindrical rotating body due to the presence of the reduced diameter portion.

Preferably, at least one of the inner peripheral surface of the cylindrical rotating body and the outer peripheral surface of the axle is provided with the rotation of the cylindrical rotating body in a vehicle advancing state. A helical screw groove for transferring the lubricating oil from one end to the other end is provided. With this configuration, the lubricating oil, which is more contained in the portion located below the helical screw groove by gravity due to gravity, rotates the cylindrical rotator or the axle in the forward traveling state of the vehicle. Accordingly, since the axle is transported from one end to the other end, there is an advantage that the oil seal can be suitably lubricated. The spiral screw groove may be a spiral space formed between the ribs by providing spiral ribs on the inner peripheral surface of the cylindrical rotating body or the outer peripheral surface of the axle. Good.

Preferably, the non-rotatable fitting between the cylindrical member and the cylindrical rotating body is performed between an inner peripheral surface of the cylindrical member and an outer peripheral surface of the cylindrical rotating body. Spline fitting is performed. With this configuration, the outer diameter of the cylindrical rotator is set to be smaller than the conventional case in which the outer peripheral surface of the cylindrical member and the inner peripheral surface of the cylindrical rotator are spline-fitted. Since it can be reduced by the thickness,
While the outer shape of the portion of the transfer that rotatably supports the cylindrical rotating body inside can be reduced, the inner peripheral surface of the cylindrical rotating body because the outer diameter of the axle that transmits the driving force cannot be reduced. In a situation where the distance between the shaft and the outer peripheral surface of the axle is narrowed, the effect of transferring the lubricating oil by the tapered inner peripheral surface and the spiral thread groove becomes remarkable.

Preferably, the lubricating oil supply device comprises:
One opening is provided inside the cylindrical rotating body at a position communicating with one end of the axle, and the other opening is above the one opening and outside the cylindrical rotating body. A lubricating oil inflow passage provided in the outer periphery of the cylindrical rotating body, and a scraping member that scoops up the lubricating oil and reaches the other opening of the lubricating oil inflow passage in a forward traveling state of the vehicle. To be included. With this configuration, the lubricating oil is scooped up by the scooping member that is rotated together with the cylindrical rotating body in the forward traveling state of the vehicle, and reaches the other opening of the lubricating oil inflow passage. Since a part of the lubricating oil flows from the other opening by gravity toward the one opening communicating with the inside of the cylindrical rotating body,
There is an advantage that the lubricating oil can be suitably supplied to the inside of the cylindrical rotating body without using an apparatus such as an oil pump.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a driving device 1 according to the present embodiment.
FIG. 2 is a cross-sectional view taken along the line II of FIG. 4 and FIG. 2 is an enlarged view of a transfer 104 of the driving device 100. FIG. 3 shows the transfer case 134 and the transfer case cover 136 viewed from the front of the vehicle, and FIG. 4 shows the transfer case 13 viewed from the left side of the vehicle.
4, the transfer case cover 136 and the extension housing 130. FIG.
FIG. 3 is a sectional view taken along the line JJ in FIG. 2, showing the bearing cap 190 and the transfer case 134.

As shown in FIG. 1, the driving device 100 of this embodiment includes a transaxle 102 and a transfer 10
4 for transmitting the output of a horizontal engine (not shown) as a prime mover to the axles of the front wheels and the rear wheels.

The transaxle 102 is a parallel two-shaft manual transmission having an input shaft 106 operatively connected to the horizontal engine via a clutch (not shown) and an output shaft 108 parallel to the input shaft 106. Device 110;
A front wheel differential gear device 116, which is a differential device for transmitting a part of the torque of the output shaft 108 to the left and right front wheels via the left and right axles 112 and 114, is housed in the transaxle case 118. As shown, the transaxle 118 is coupled to the engine block 122 of the horizontal engine at a combination surface 120 thereof.

The transfer 104 transmits the output of the horizontal engine to the rear wheels. The transfer 104 includes a combination surface 128 that is brought into close contact with the combination surface 126 of the transaxle case 118.
A transfer case 134 having an elongated extension housing 130 connected to the right side of the vehicle and having a through hole extending in the vehicle front-rear direction on the rear side of the vehicle, and having an opening 132 opened to the front side of the vehicle.
And a transfer case cover 136 that is brought into close contact with a combination surface 138 formed around the opening 132 of the transfer case 134 to close the opening 132, and is opposed to one end, that is, the side of the transaxle 102. The end 140 on the side and the other end, that is, the end 142 on the side of the transaxle 102, are rotatably supported by the transfer case 134 via rolling bearings 144 and 146, and constitute the cylindrical rotating body. A ring gear mount case 150 and a ring gear 1 which is a hypoid gear fixed by bolts to the outer periphery of an enlarged diameter portion 151 provided at an intermediate portion in the axial direction of the ring gear mount case 150.
48, a pinion gear 154 which is a hypoid gear meshed with the ring gear 148 at one end on the front side of the vehicle, and an end 156 on the rear side of the vehicle is connected to a propeller shaft (not shown). It includes a joint member 158 to be connected and a second gear member 160 spline-fitted.

The second gear member 160 is rotatably supported via two rolling bearings 164 and 166 at two positions on the front side of the vehicle, that is, at the end on the side of the ring gear 148, and is mounted in the transfer case 134. At the same time, the end 156 on the rear side of the vehicle is
And, it is supported by the extension housing 130 via a slide bearing 168. The rolling bearings 144, 146, 164, and 166 are tapered roller bearings in which the outer ring and other parts can be separated.

The right front wheel axle 114 has one end, that is, an end 172 on the right front wheel side, via a rolling bearing 174 serving as an axle bearing.
And the other end, that is, the end 176 on the side of the transaxle 102, is connected to a differential case 186 of the front differential gear device 116 via a rolling bearing 178 (see FIG. 1). ) Is rotatably supported on the inner peripheral surface of a cylindrical member 188 integrally provided on the right side of the vehicle.

The other end 142 of the ring gear mount case 150 is connected to the inner peripheral surface of the distal end of the cylindrical member 188 on the outer peripheral surface on the distal end side from the position where the rolling bearing 146 is fitted. Spline fit. Due to the spline fitting, the output of the horizontal engine is changed by the differential case 186, the first gear member 152, the second gear member 160, the joint member 158, the propeller shaft (not shown), the front wheel and the rear wheel of the front wheel differential gear device 116. The transmission is also transmitted to the rear wheels via a not-shown viscous coupling (not shown) as a differential device that allows a difference in rotation speed, and a rear wheel differential gear device (not shown).

The rolling bearing 14 fitted to the one end 140 of the ring gear mount case 150
4, the transfer case 134 has the opening 13
2 is sandwiched between a fixing member attached from the vehicle front side, that is, a bearing cap 190 and the transfer case 134. The transfer case 134
A ring-shaped spacer 196 is fitted on the bearing surface 194 side between the annular bearing surface 194 formed toward the rolling bearing 144 and the outer ring of the rolling bearing 144, and a shim 198 is fitted on the rolling bearing 144 side. Have been.
The other end 14 of the ring gear mount case 150
The rolling bearing 146 fitted to the second case 2 is fitted together with a ring-shaped shim 202 into a stepped hole 200 provided on the transfer axle 102 side of the transfer case 134. By setting the thicknesses of the spacer 196 and the shims 198 and 202, the preload of the two rolling bearings 144 and 146 is properly adjusted.

As shown in FIG. 5, the bearing cap 190 is attached to an attachment surface 208 formed inside the transfer case 134 in parallel with the combination surface 138 by two bolts 210 and the rolling bearing A concave curved surface 212 which forms a part of a cylindrical inner peripheral surface having substantially the same curvature as the outer peripheral surface of 144 is formed. The transfer case 134 includes the concave curved surface 2
A concave curved surface 214 which forms a pair with the concave curved surface 212 and forms an inner peripheral surface of a cylinder having substantially the same curvature as the outer peripheral surface of the rolling bearing 144 is formed together with the concave curved surface 212. These concave surfaces 21
Due to the inner peripheral surface of the cylinder constituted by 2 and 214, the rolling bearing 144
Is fixed to the transfer case 134 by being attached to the transfer case 134.

As shown in detail in FIG. 6, (a) front view, (b) left side view, (c) right side view, and (d) rear view, the spacer 196 is located across the axis. Notch grooves 220 and 222 in the radial direction are formed on the opposite end faces, and projections 224 and 226 for positioning are formed at two places on the outer peripheral surface. As shown, the projections 224 and 226 are fitted into the notches 230 and 232 formed on the mounting surface 208 side of the bearing cap 190, respectively, and the concave curved surface 212 of the bearing cap 190 and the concave It is fitted between the curved surface 214. The spacer 196 and the shim 198
The outer diameter of the roller bearing 144 is slightly smaller than the outer diameter of the rolling bearing 144, and the spacer 196 and the shim indicate that the rolling bearing 144 is sandwiched and firmly fixed between the bearing cap 190 and the transfer case 134. 19
8 will not hinder you. Notch groove 220
As shown in FIG. 8 which is a sectional view taken along the line KK in FIG.
A through-hole 238 serving as a lubricating oil inflow passage and a spacer 1 are formed on the concave curved surface 214 and the flat portion 236 shown in FIG.
The space 96 on the inner peripheral side is formed at a position where communication with the space through the notch groove 220 is possible.

Inside the transfer case 134, a meshing portion between the ring gear 148 and the pinion gear 154, the rolling bearings 142, 144, 164, 1
66, the lubricating oil for lubricating the slide bearing 168 and the like has a height of the oil level of the lubricating oil when the vehicle is stationary.
It is sealed so as to be at the position shown by the two-dot chain line in FIG. The lubricating oil is transferred to the transfer case 134.
As shown in FIG. 2, oil seals 242, 244 and 246 are attached to the transfer case 134 in order to prevent leakage from the outside. The oil seals 248 and 249 prevent the lubricating oil sealed in the transaxle case 118 and the transfer case 134 from mixing with each other. The lubricating oil sealed in the transfer case 134 is adapted to suitably lubricate the ring gear 148 and the pinion gear 154, which are hypoid gears, whereas the lubricating oil sealed in the transfer axle case 118 is Is used for the transaxle 102,
This is in order to prevent these two types of lubricating oils from mixing with each other.

The above oil seals 242, 244, 24
6, 248 and 249 need to be supplied with lubricating oil in the same manner as the hypoid gears and the like in order to form an oil film for preventing deterioration on the sliding portions. The oil seals 242, 244 and 246 are used when the lubricating oil is caused to flow in the transfer case 134 due to the rotation of the first gear member 152 and the second gear member 160 and the vibration of the vehicle body in the running state of the vehicle. As shown in FIG. 2 by a plurality of arrows, an example of the flow pattern is provided at a position where the lubricating oil can be sufficiently distributed. Further, the oil seal 249 is provided at a position where the lubricating oil sealed in the transaxle case 118 can be easily distributed. On the other hand, in order for the oil seal 248 to be lubricated, the ring gear mount case 1
The inside of a cylindrical lubricating oil passage 254 provided between the inner peripheral surface 250 of the wheel 50 and the outer peripheral surface 252 of the axle 114 is moved from the one end 172 side of the wheel 114 to the other end 176 side. Need to be transported towards.

Here, the oil seal 242 is connected to the through hole 238 and the spacer 196 as described later.
Through the notch groove 220 formed in the spacer 1
The lubrication oil is lubricated by lubricating oil supplied to the inside of the 96. Further, the oil seal 244 is provided with a lubricating oil through a through hole 243 for communicating a position of the transfer case 134 where the oil seal 244 is attached and a position inside the transfer case 134 near the pinion gear 154. Is supplied. The oil seal 246 includes the rolling bearings 164 and 1.
66 and through holes 245 and 24 provided in the transfer case 134 near the rolling bearing 164 and the like.
As shown in FIG. 9, which is supplied to the inside of the extension housing 130 through FIG. 7 and is a sectional view taken along the line JJ of FIG. 2 showing the inside of the extension housing 130, a vehicle having a longitudinal through hole of the extension housing 130 Lubricating oil reservoir 24 provided at the rear bottom
The lubricating oil is supplied through 0 and the communication groove 241. Here, the lubricating oil level when the vehicle is stationary shown in FIG. 9 shows the same height as the lubricating oil level when the vehicle is stationary shown in FIG. The lubricating oil thus supplied is supplied to the sliding bearing 168.
Will also lubricate. The lubricating oil sump 240
Is the case where the vehicle is located on a downhill, etc.
Even when the lubricating oil is not sufficiently supplied, the lubricating oil is stored in the lubricating oil reservoir 240 to prevent the lubricating oil from being supplied to the oil seal 246 and the slide bearing 168. is there.

Next, a configuration for suitably lubricating the oil seal 248 will be described. A part of the lubricating oil sealed in the transfer case 134 is supplied to the ring gear 14 functioning as a scraping member when the vehicle is moving forward.
8, the lubricating oil is scooped up in the direction of arrow Q in FIG. 5, and the lubricating oil flow is interrupted by ribs 256 as shown by an example of the flow pattern with arrows other than arrow Q in FIG. 2, the through hole 238 serving as a lubricating oil inflow passage, the cutout groove 220 of the spacer 196, and the spacer 196, which reach the flat portion 236 and open to the flat portion 236 as shown in FIG. The lubricating oil passage 254 is caused to flow into the lubricating oil passage 254 from a side opposite to the transaxle 102 side, that is, from the one end portion 140 side through a path including an inner peripheral space or the like.
Therefore, the lubricating oil is supplied into the lubricating oil passage 254 from the one end 140 side as the vehicle forward state continues. In the drive device 100 of the present embodiment, the ring gear 148 as the scraping member, the through hole 238 as the lubricating oil inflow passage, and the spacer 19
6 and the space on the inner peripheral side of the spacer 196 constitute a lubricating oil supply device 258.

The inner peripheral surface 250 of the ring gear mount case 150 has an inner peripheral surface 260 at one end which is the inner peripheral surface of the one end 140 of the ring gear mount case 150.
And the inside of the enlarged diameter portion 151,
An inner peripheral surface 262 of the enlarged diameter portion whose inner diameter is changed according to the shape of No. 1 and an inner peripheral surface 264 of the other end which is an inner peripheral surface of the other end 142.

The inner peripheral surface 264 of the other end has a structure shown in FIG.
As shown in (a), the inner diameter of the tapered inner peripheral surface 266 becomes larger toward the distal end side of the other end portion 142, and the inner diameter is further located at the distal end side than the tapered inner peripheral surface 266. Is smaller than the minimum inner diameter of the tapered inner peripheral surface 266 and slightly smaller than the outer diameter of the end 176 of the axle 114 on the transaxle 102 side. Have been. A portion of the other end 142 where the reduced diameter inner peripheral surface 268 is provided is a reduced diameter portion 270. The reason why the reduced diameter portion 270 is provided will be described later.

The lubricating oil accommodated in the lower part of the lubricating oil passage 254 located between the tapered inner peripheral surface 266 and the outer peripheral surface 252 of the axle 114 is The lubricating oil reaches the oil seal 248 by gravity and surface tension at the reduced diameter inner peripheral surface 268 by utilizing the fact that the lubricating oil is easily transported toward the tip end of the other end 142 by centrifugal force. Is to make it easier.

The transfer 10 constructed as described above
4 is assembled as follows. First, as shown in FIG. 2, a second gear member 160 in which a part other than the outer ring of the rolling bearing 164 is fitted to a transfer case 134 in which a shim 272 is fitted to the outer ring of the partial bearing 164 is attached. It is inserted through the opening 132 from the part 156 side. Subsequently, after the rolling bearing 166 is fitted into the second gear member 160 from the end portion 156 side, the tightening member 274 is fixed to the second gear member 160, and as shown in FIG. A gear member 160 is rotatably mounted on the transfer case 134. Subsequently, after the outer ring of the shim 202 and the rolling bearing 146 is fitted into the stepped hole 200 of the transfer case 134, the portion other than the outer ring of the rolling bearing 146 and the rolling bearing 144 are fitted and the ring gear 144 is fitted. The ring gear mount case 150 in which the first gear member 152 is attached with the bolts 148 by bolts.
Is inserted through the opening 132 from the other end 142 side of the ring gear mount case 150, and the pinion gear 154 and the ring gear 148 are engaged with each other.

Next, as shown in FIG. 2, the spacer 196 and the shim 198 are fitted between the receiving surface 194 of the transfer case 134 and the rolling bearing 144, and the rolling bearing 1 is rotated by the bearing cap 190.
The transfer case 134 is fixed to the transfer case 134 so as not to be detached, and then the transfer case cover 136 is attached to the transfer case 134. The extension housing 130 is mounted on the transfer case 134 after the slide bearing 168 and the oil seal 246 are fitted therein and the second gear member 160 is rotatably mounted on the transfer case 134, and then the joint member 158 is connected to the second gear member 158. The end 156 of the member 160 is fitted.

After the transfer 104 assembled as described above is fixed to the transaxle 102 as described above, the axle 114 is fitted into the transfer 104 and the transaxle 102 sequentially from the end 176 of the transaxle 102. It is put in and assembled. At that time, the differential case 186, in which the cylindrical member 188 is integrally provided, is already assembled in the transaxle 102, and the oil seal 248 is provided on the inner peripheral surface of the cylindrical member 188.
Is also fitted. Therefore, in order to prevent the oil seal 248 from being damaged by the other end 176 of the axle 114, the axle 114 is fitted into the transfer 104 and the transaxle 102 with the axle 114 centered. Need to be done. The reduced diameter portion 270 provided at the other end 142 of the ring gear mount case 150 is used for centering, and the other end 176 of the axle 114 passes through the reduced diameter portion 270. This allows the axle 114 to be centered before the end portion 176 passes through the oil seal 248.

FIG. 10B shows the reduced diameter portion 270.
Ring gear mount case 15 at equal intervals in the circumferential direction of
A plurality of oil grooves 27 penetrating in a direction parallel to the zero axis direction
6 shows another embodiment in which 6 is provided. In this way, there is an advantage that it is possible to preferably prevent the lubricating oil from being hardly transferred in the axial direction of the ring gear mount case 150 due to the presence of the reduced diameter portion 270.

As described above, in the driving device of each of the above-described embodiments, the lubricating oil supply device 258 is lifted up by the rotation of the ring gear mount case 150 to rotate the ring gear mount case 15.
0 end 1 opposite to the transaxle 102 side
The lubricating oil supplied into the ring gear mount case 150 is guided to the end 142 on the transaxle 102 side through a lubricating oil passage 254 provided in the ring gear mount case 150. It is not necessary to provide the opening 70 provided in the enlarged diameter portion 68 of the ring gear mount case 32 of the ring gear mount case 32 in the ring gear mount case 150, so that the shape of the transfer 104 is restricted or the ring gear mount case 15
The lubricating oil can be supplied to the inside of the ring gear mount case 150 without reducing the strength of the ring gear.

The ring gear mount case 15
0 is provided on one end 1 of the axle 114.
A tapered inner peripheral surface 266 is provided in which the inner diameter increases toward the other end 176 side from the 72 side. By doing so, the inner peripheral surface 25 of the ring gear mount case 150
0 and the axle 114 at a portion located mainly below the space between the axle 114 and the axle 114 due to centrifugal force.
Since the oil seal 248 is transferred to the other end 176 side of the oil seal 14, the oil seal 248 can be advantageously lubricated.

The ring gear mount case 15
0 at the end 142 on the transaxle 102 side.
The end 17 of the axle 114 on the side of the transaxle 102 so that the inner diameter is smaller than that of the other portion of the inner peripheral surface 250 but can pass through the axle 114.
6 is provided with a reduced diameter portion 270 reduced to a diameter slightly larger than the outer diameter. By doing so, the axle 11
4 is sequentially penetrated from the end 176 on the side of the transaxle 102 to the inside of the ring gear mount case 150, the inside of the oil seal 248, and the like, and is assembled into the transfer 104 and the transaxle 102. Since the centering is performed in advance by the reduced diameter portion 270 before the oil seal 248 is penetrated through the inside of the axle 11,
There is an advantage that an assembly failure that is damaged by the end 176 of the fourth member can be eliminated.

Next, another embodiment of the present invention will be described with reference to the drawings. In the following description, portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 10C, the driving device of this embodiment has one end of a ring gear mount case 280 constituting a cylindrical rotating body, that is, an end opposite to the transaxle 102 side. Part 140 and enlarged diameter part 15
1 has the same configuration as that of each of the above-described embodiments,
The other end, that is, the end 282 on the side of the transaxle 102 is different from that of each of the above-described embodiments, and the inner peripheral surface of the other end 282 of the inner peripheral surface 284 of the ring gear mount case 280 is different. A spiral screw groove, that is, a left-handed female screw 28
8 are provided. The inner diameter of the female screw 288 is the same as the inner diameter of the reduced diameter portion 270 in the above-described embodiment, and is the other portion of the inner peripheral surface 284, that is, the inner peripheral surface 2 at one end.
The outer diameter of the outer peripheral surface 292 of the axle 290 is slightly smaller than that of the outer peripheral surface 292 of the axle 290. This is substantially the same as the provision of the reduced diameter portion 270 on the inner peripheral surface 286 of the other end. As described above, a part of the lubricating oil passage 294 on the other end 282 side of the drive device of the present embodiment is formed by the thread groove of the female screw 288.

The portion of the thread groove of the left-handed female screw 288 cut by an imaginary plane fixed to the space including the axis is the ring gear mount case 2.
5 moves from one end 140 side to the other end 142 side of the ring gear mount case 280 in a state of being rotated in the direction of the arrow shown in FIG. The lubricating oil that is more contained inside the portion located below the screw groove than above the screw groove is moved from the one end 140 side to the other end 28.
It will be transported towards the two sides.

FIG. 10D shows the axle 290 instead of the female screw 288 being provided on the inner peripheral surface 286 of the other end of the ring gear mount case 280 of the embodiment shown in FIG. 10C. A left-handed male screw 296 forming a helical screw groove is provided in a portion located inside the other end 282 of the outer peripheral surface 292 of the
This shows another embodiment in which the inner diameter of the inner peripheral surface 295 of the other end 282 is slightly larger than the outer periphery of the male screw 296. In this embodiment, the thread groove of the male screw 296 constitutes a part of the lubricating oil passage 298, and the lubricating oil is supplied to the ring gear mount case 280.
In accordance with the rotation of the axle 290, the one end 140 side and the other end 2
It is transported toward the 82 side.

The ring gear mount case 28
0 and the axle 290,
And the external thread 296 may be provided together. In the case of such an embodiment, there is an advantage that the volume of the lubricating oil to be transferred increases because the volume of the thread groove for storing the lubricating oil increases.

As described above, in the ring gear mount case 280 of each embodiment shown in FIG. 10C or FIG. 10D, the lubricating oil supply device 258 controls the rotation of the ring gear mount case 280. The lubricating oil scooped up and supplied to the end 140 side of the ring gear mount case 280 opposite to the transaxle 102 side is lubricating oil passage 294 or 298 provided in the ring gear mount case 280. Through the transaxle 102 side end 2
Since it is guided to the side 82, it is not necessary to provide the opening 70 provided in the enlarged diameter portion 68 of the ring gear mount case 32 of the conventional transfer 14 of FIG. The lubricating oil can be supplied into the ring gear mount case 280 without being limited by the shape of the ring gear. The ring gear mount case 2
The strength of 80 can also be improved.

The ring gear mount case 28
0 at the end 282 on the transaxle 102 side.
The other end of the inner diameter reduced to a diameter slightly larger than the outer diameter of the axle 290 so that the inner diameter is smaller than the other portion of the inner peripheral surface 284 but can penetrate the axle 290 Since the inner peripheral surface 286 is provided, the axle 290 is sequentially passed through the ring gear mount case 280, the inside of the oil seal 248, and the like from one end 176 thereof, and is assembled into the transfer 104 and the transaxle 102. Before the oil seal 248 is penetrated through the inside of the oil seal 248, the centering is performed in advance by the inner peripheral surface 286 of the other end, so that the oil seal 248 is damaged by the end 176 of the axle 290. There is an advantage that attachment failure can be eliminated.

The ring gear mount case 28
0, at least one of the inner peripheral surface 286 of the other end and the outer peripheral surface 292 of the axle 290 from one end 172 of the axle 290 to the other with the rotation of the ring gear mount case 280 in a vehicle forward state. End 176 of
Since the female screw 288 or the male screw 296 forming the spiral screw groove for transferring the lubricating oil toward the side is provided, the female screw 288 or the male screw 296 is formed by gravity.
The lubricating oil that is more contained in the portion located below the thread groove above the one of the axle 290 with the rotation of the ring gear mount case 280 and the axle 290 in the vehicle forward state is increased. Since the oil seal 248 is transported from the side to the other end 176 side, there is an advantage that the oil seal 248 can be suitably lubricated.

FIG. 11 is a view showing a ring gear mount case 300 constituting a cylindrical rotating body in the drive unit of this embodiment which is still another embodiment of the present invention.
FIG. 12 and FIG. 13 are a right side view and a left side view, respectively, of FIG. FIG. 14 is a front view showing the enlarged diameter portion 302 of the ring gear mount case 300, and FIG. 15 is a plan view thereof.

As shown in FIG. 11, the ring gear mount case 300 of the present embodiment has an enlarged diameter portion 302 of the inner peripheral surface 304.
The spiral rib 310 that draws a spiral in the same direction as the thread of the left-hand thread is formed on the inner peripheral surface 306 of the enlarged diameter portion, which is a portion located inside the
As shown in FIGS. 12 to 15, one end of the ring gear mount case 300 on the outer peripheral surface of the enlarged diameter portion 302, that is, the transaxle 102 side. Opposite end 14
On the 0 side, two flat reinforcing ribs 316, four reinforcing ribs 318, and four reinforcing ribs 320 for improving the rigidity of the ring gear mount case 300 are formed, respectively. Since the outer shape of the ring gear mount case 300 is molded by a two-piece mold, the reinforcing ribs 316 and the like are not shown in FIG.
Are provided at positions axially symmetric with respect to the symmetry axis P shown in FIG.

When the ring gear mount case 300 is rotated in a direction indicated by an arrow A in FIG. 11 when the vehicle is moving forward, the spiral rib 310 forms a spiral screw formed between the spiral rib 310. By applying a force to the lubricating oil accommodated in the spiral groove 324 as a groove in a direction perpendicular to the spiral rib 310, that is, in a direction indicated by an arrow B in FIG. 11, the one end 172 of the axle 114 is applied. The lubricating oil is transferred from the side to the other end 176 side.

The reinforcing ribs 316, 318 and 320
Is provided mainly to increase the rigidity of the enlarged diameter portion 302 of the ring gear mount case 300. By increasing the rigidity of the enlarged diameter portion 302 with ribs such as the reinforcing ribs 316, the enlarged diameter portion 30
The weight of the ring gear mount case 300 can be reduced as compared with a case where the same rigidity is obtained by increasing the thickness of the ring gear mount case 2. Note that the reinforcing ribs 316 and the like also help to scrape up the lubricating oil sealed in the transfer case 134 as the ring mount case 300 rotates.

In the driving device of this embodiment, the lubricating oil supply device 258 is lifted up by the rotation of the ring gear mount case 300 to rotate the transaxle 10 of the ring gear mount case 300.
The lubricating oil supplied in the end 140 opposite to the second side is
The lubricating oil passage 254 provided in the ring gear mount case 300 is guided to the end 142 on the transaxle 102 side, so that the enlarged diameter portion of the ring gear mount case 32 of the conventional transfer 14 in FIG. It is not necessary to provide the opening 70 provided in the ring gear mount case 300 in the ring gear mount case 300, and the ring gear mount can be formed without restricting the shape of the transfer 104 or reducing the strength of the ring gear mount case 300. Lubricating oil can be supplied into the case 300.

The inner peripheral surface 306 of the enlarged diameter portion of the ring gear mount case 300 according to the present embodiment is rotated from the one end 172 side of the axle 114 to the other side by the rotation of the ring gear mount case 300 in a vehicle forward state. End 1
Since the spiral groove 324 for transferring the lubricating oil toward the side 76 is provided by the provision of the spiral rib 310, the inside of the portion located below the spiral groove 324 by gravity is lower. A large amount of lubricating oil is moved from one end 172 of the axle 114 to the other end 176 of the axle 114 as the ring gear mount case 300 and the axle 114 rotate in the vehicle forward state.
The oil seal 2
48 has the advantage that it can be suitably lubricated.

In the drive devices of all the embodiments described above, the cylindrical member 188 and the ring gear mount case 150, 280, or 300 are fitted into the ring gear mount case 150, 280, or 300 so that they cannot rotate relative to each other. The spline fits between the surface and the outer peripheral surface of the ring gear mount case 150 and the like. Therefore, the outer diameter of the ring gear mount case 150 and the like is smaller than that of the conventional driving device 10 in which the outer peripheral surface of the cylindrical member 54 and the inner peripheral surface of the ring gear mount case 32 are spline-fitted. Since the thickness can be reduced by the thickness, the outer shape of the portion of the transfer 104 that rotatably supports the ring gear mount case 150 and the like can be reduced, while the axle 114 or 2 that transmits the driving force.
Because the outer diameter of the axle 114 cannot be reduced, the inner peripheral surface 250 of the ring gear mount case 150 and the like and the axle 114 cannot be reduced.
Alternatively, in a situation where the interval between the outer peripheral surface 252 and the like of the 290 is narrowed, the transfer of the lubricating oil by the tapered inner peripheral surface 266, the female screw 288 and the male screw 296 as the spiral screw groove, and the spiral groove 324. The effect becomes remarkable.

The lubricating oil supply device 258 is positioned such that the one opening opening on the concave curved surface 214 communicates with the inside of the ring gear mount case 150 or the like from one end 172 side of the axle 114 or the like. The other opening provided in the flat portion 236 is provided in the through hole 238 provided above the one opening and outside the ring gear mount case 150 and the like, and in the outer periphery of the ring gear mount case 150 and the like. Provided,
Since the lubricating oil includes the ring gear 148, the reinforcing ribs 316, and the like as a scooping member that scoops up the lubricating oil to reach the other opening of the through hole 238 in the vehicle forward state, the lubricating oil is In this state, the through-hole 23 is scraped up by the ring gear 148 or the reinforcing rib 316 as the scraping member which is rotated together with the ring gear mount case 150 or the like.
8, a part of the lubricating oil flows from the other opening toward the one opening communicating with the inside of the ring gear mount case 150 or the like by gravity. There is an advantage that the lubricating oil can be suitably supplied to the inside of the ring gear mount case 150 or the like without using a device such as the above.

Although the embodiments of the present invention have been described with reference to the drawings, the present invention can be applied to other embodiments. For example, the tapered inner peripheral surface 266, the female screw 288, the male screw 2 provided in the drive device of each of the above-described embodiments.
96, the spiral rib 310 can be implemented in any combination. For example, a tapered screw having the same thread groove as the female screw 288 may be provided on the tapered inner peripheral surface 266.

When the reduced diameter portion 270 is provided together with the tapered inner peripheral surface 266, the reduced diameter portion 2
Whether or not the oil groove 276 passing through 70 is provided is also optional.

The female screw 288 and the male screw 29
6 is, for example, in the embodiment shown in FIG.
The position where these are provided may be arbitrarily changed, for example, by providing a male screw similar to the male screw 296 only in a portion of the outer peripheral surface 252 of the axle 114 facing the reduced diameter portion 270.

The helical rib similar to the helical rib 310 is provided at one end inner peripheral surface 26 which is the inner peripheral surface of the one end 140 of the ring gear mount case 150 and the like.
0 may be provided.

Further, a male screw similar to the male screw 296 or a helical rib may be provided on the outer peripheral surface of the intermediate portion of the second gear member 160.

In addition, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a driving device according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a transfer of the driving device of FIG. 1;

FIG. 3 is a diagram showing the transfer as viewed from the front of the vehicle.

FIG. 4 is a diagram showing the transfer as viewed from the left side of the vehicle.

FIG. 5 is a sectional view taken along the line JJ in FIG. 2 showing the inside of the transfer case of the transfer.

FIG. 6 is a view showing a shape of a spacer shown in FIG. 2;

FIG. 7 is a diagram showing a state in which the spacer is attached to a transfer case of the transfer as viewed from the left side of the vehicle.

8 is a sectional view taken along the line KK of FIG. 7;

FIG. 9 is a sectional view taken along the line JJ in FIG. 2 showing the inside of the extension housing of the transfer.

FIG. 10 is a sectional view showing some embodiments of a part of the lubricating oil passage of FIG. 2;

FIG. 11 is a sectional view taken along line MM in FIG. 12 showing another embodiment of the ring gear mount case of FIG. 2;

FIG. 12 is a right side view of the ring gear mount case of FIG. 11;

FIG. 13 is a left side view of the ring gear mount case of FIG. 11;

FIG. 14 is a front view showing an enlarged diameter portion of the ring gear mount case of FIG. 11;

FIG. 15 is a plan view showing an enlarged diameter portion of the ring gear mount case of FIG. 11;

FIG. 16 is a sectional view showing an example of a conventional driving device.

[Description of sign]

100: drive device 102: transaxle 104: transfer 114, 290: axle 140, 142: end 150, 280, 300: ring gear mount case (cylindrical rotating body) 176: outer peripheral surface 248: oil seal 250, 284 304: inner peripheral surface 288: cylindrical member 254: lubricating oil passage 258: lubricating oil supply device

 ──────────────────────────────────────────────────の Continued from the front page (72) Inventor Satoshi Ashida 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (1)

[Claims] 1. A transfer fixed to the transaxle with one end protruding outside from the transfer case and the other end accommodating the axle reaching the inside of the transaxle; A cylindrical rotating body that is concentric and rotatably supported on the outer periphery of the axle; and is disposed on the outer periphery of the axle in the transaxle and concentric with the axle, and the transfer axle is provided from the transaxle. A cylindrical member whose end protruding inward is fitted into the transaxle-side end of the cylindrical rotating body so as to be relatively non-rotatable;
Lubricating oil disposed between the inner peripheral surface of the cylindrical member and the outer peripheral surface of the other end of the axle vertically passing through the cylindrical member, and encapsulated in the transfer and the transaxle A four-wheel drive vehicle including an oil seal that seals and separates the lubricating oil enclosed in the transfer device, wherein the lubricating oil enclosed in the transfer is rotated with the rotation of the cylindrical rotating body. A lubricating oil supply device that supplies the inside of the cylindrical rotating body on the side opposite to the transaxle side by scraping up, and an inner circumferential surface of the cylindrical rotating body and an outer circumferential surface of the axle. And a lubricating oil passage that guides lubricating oil supplied into an end of the cylindrical rotating body opposite to the transaxle side to an end on the transaxle side. Drive device for four-wheel drive vehicles.