JP3751488B2 - Differential device for FF vehicle transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a differential for an FF (front engine / front drive) vehicle transmission, and in particular, prevents leakage of lubricating oil even when a drive shaft is not attached, facilitates processing, reduces weight, and The present invention relates to a differential device for an FF vehicle transmission capable of reducing the cost.
[0002]
[Prior art]
A transmission mounted on an FF (front engine / front drive) vehicle is generally housed in the same case together with a differential gear, and is different from the lubrication of the transmission mechanism by the same lubricating oil sealed in the case. The moving device is lubricated.
[0003]
Conventionally, when this FF vehicle transmission is mounted on a vehicle and the drive shaft is attached to the differential, the inside of the case is sealed by a seal member provided between the outer peripheral surface of the drive shaft and the case. The lubricating oil in the case was not leaked.
[0004]
However, according to the conventional FF vehicle transmission, when the drive shaft is removed and the transmission itself is completed, the lubricant cannot be sealed in the case, so the vehicle manufacturer needs to inject the lubricant. For this reason, it was not possible to meet the demands of vehicle manufacturers without lubrication facilities (such as manufacturers that do not produce transmissions in-house).
[0005]
Therefore, as a conventional FF vehicle transmission that solves the above problem, for example, there is one disclosed in Japanese Patent Laid-Open No. 10-213209.
[0006]
FIG. 4 shows a cross section of the differential device 1 of the FF vehicle transmission having the same structure as that disclosed in the above publication. The differential device 1 has through-holes 3a and 3b through which a drive shaft, which will be described later, passes, and is housed together with a speed change mechanism (partially shown) 2 in a case 3 of a transmission that contains lubricating oil therein. The ring gear 5 meshed with the reduction gear 4 serving as the output member of the speed change mechanism 2, the lid member 6 </ b> A having the through hole 6 a, and the housing member 6 </ b> B having the through hole 6 b are integrated with the ring gear 5 by the bolt 7. The differential case 6 that rotates by inputting a driving force from the collar portion 6 c, the bearings 8 and 9 that rotatably support the differential case 6 in the case 3, and the rotation axis of the differential case 6 in the housing member 6 </ b> B of the differential case 6 The pinion shaft 10 that extends in the direction of rotation and engages with the housing member 6B and rotates integrally with the differential case 6, and the pinion shaft 10 A pinion gear 11 rotatably supported, a gear portion 12a meshing with the pinion gear 11, and a cylindrical portion 12b extending from the gear portion 12a through the through holes 6a and 6b and extending to the outside of the differential case, and drive shafts 15A and 15B and splines Side gears 12A and 12B having hollow portions 12c with splines to be fitted formed on the inner peripheral surface, caps 13A and 13B for closing the openings on the gear portion 12a side of the hollow portions 12c of the side gears 12A and 12B, and a case 3 In the through holes 3a and 3b, oil seal mechanisms 14A and 14B provided between the outer peripheral surface of the cylindrical portion 12b of the side gears 12A and 12B and the case 3 are configured. Reference numeral 6d denotes a window formed in the differential case 6.
[0007]
According to the FF vehicle transmission having the above configuration, the cylindrical portions 12b of the side gears 12A and 12B extend through the through holes 6a and 6b to the outside of the differential case so as to reach the through holes 3a and 3b of the case 3. Since the oil seal mechanisms 14A and 14B are provided between the cylindrical portion 12b and the case 3 in the through holes 3a and 3b, the lubricating oil passes along the outer peripheral surface of the cylindrical portion 12b of the side gears 12A and 12B. , 3b can be prevented by the oil seal mechanisms 14A, 14B. Further, since the opening on the gear portion 12a side of the hollow portion 12c of the side gears 12A and 12B is closed by the caps 13A and 13B, the lubricating oil flows out from the through holes 3a and 3b of the case 3 along the hollow portions 12c of the side gears 12A and 12B. This can be prevented by the caps 13A and 13B. Therefore, leakage of the lubricating oil can be prevented even when the drive shafts 15A and 15B are not attached.
[0008]
[Problems to be solved by the invention]
However, according to the conventional FF vehicle transmission, it is necessary to make the cylindrical portion of the side gear to reach the through hole of the case of the transmission, so the length of the cylindrical portion is several times larger than the normal length. In addition, there is an inconvenience that the processing becomes difficult due to the problem of the mold at the time of processing (particularly at the time of processing by forging). In addition, the differential case is divided into a cover member and a storage member so that the side gear and the like can be stored. Therefore, there is a disadvantage in that the thickness increases to increase the rigidity of each component, thereby increasing the weight. Further, the increase in the number of parts and the necessity of processing of the mating surfaces cause an increase in cost.
[0009]
Accordingly, an object of the present invention is to provide a differential apparatus for a transmission for an FF vehicle that can prevent leakage of lubricating oil even when a drive shaft is not attached, and can facilitate processing, reduce weight, and reduce costs. Is to provide.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is constituted by a single member so as to have a window at a predetermined position and first and second through holes through which the first and second drive shafts pass. A differential case that is housed in a case of the transmission having first and second through holes through which the first and second drive shafts pass and receives torque from the torque output portion of the transmission, and rotates. A pinion gear that passes through the differential case and is inserted into the differential case, and is rotatably supported by a pinion shaft that rotates integrally with the differential case, meshes with the pinion gear, and the first and second drive shafts And the first and second gear members having fitting holes for spline fitting with the first and second through holes of the differential case, so that one end is in front The first and second gears are press-fitted to the end portions of the first and second gear members, the other ends extend outward from the differential case, and have insertion holes through which the first and second drive shafts are inserted. First and second side gears made of cylindrical members, inner peripheral surfaces of the first and second through holes of the transmission case, and the differential cases of the first and second cylindrical members. The first and second oil seal mechanisms inserted between the outer peripheral surfaces of the first and second portions, and the first and second oil seal mechanisms closing the pinion gear side opening of the fitting hole of the first and second gear members. A cap, wherein the pinion gear and the first and second gear members are inserted from the window and disposed at predetermined positions inside the differential case, and the first and second cylindrical members are disposed on the differential case. Inside the pinion gear, and front After the first and second gear members are inserted, they are inserted from the first and second through holes of the differential case and press-fitted to the end portions of the first and second gear members. The present invention provides a differential device for an FF vehicle transmission.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a differential device for an FF vehicle transmission according to the present invention will be described in detail with reference to the accompanying drawings.
[0012]
FIG. 1 shows a differential device for an FF vehicle transmission according to a first embodiment of the present invention. In this figure, the same reference numerals and symbols are assigned to the same parts as in FIG.
[0013]
In this differential device for a FF vehicle transmission, the gear member 12d accommodated in the differential case 6 and the cylindrical member 12e passing through the through holes 6a and 6b of the differential case 6 are connected by press-fitting to connect the side gears 12A and 12B. The oil seal mechanisms 14A and 14B are arranged between the outer peripheral surface of the cylindrical member 12e that protrudes to the outside from the differential case 6 and the inner peripheral surfaces of the through holes 3a and 3b of the case 3.
[0014]
The gear member 12d has a fitting hole 12f for spline fitting with the drive shafts 15A and 15B, and is inserted into the differential case 6 from the window 6d of the differential case 6 together with the pinion gear 11, thereby having a predetermined positional relationship with the pinion gear 11. It has a configuration accommodated in the differential case 6.
[0015]
The cylindrical member 12e has an insertion hole 12g through which the drive shafts 15A and 15B are inserted. After the pinion gear 11 and the gear member 12d are inserted into the differential case 6, the cylindrical member 12e is inserted from the through holes 6a and 6b of the differential case 6. As a result, the through-holes 6a and 6b of the differential case 6 pass through, and one end is connected to the end of the gear member 12d in the differential case 6 by press-fitting and the other end extends from the differential case 6 to the outside. is doing.
[0016]
FIG. 2 shows an enlarged view of the side gear 12A. The gear member 12d and the cylindrical member 12e have step-like pressure contact fitting surfaces 12h and 12i, respectively, and are connected by fitting the two pressure contact fitting surfaces 12h and 12i. Thus, the side gear 12A is formed. For the connection of the gear member 12d and the cylindrical member 12e, a large force does not act on the cylindrical member 12e when the vehicle is running, so an appropriate coupling force is sufficient. Absent. Since the side gear 12B has the same configuration as the side gear 12A, the description of the side gear 12B is omitted.
[0017]
According to the differential device for an FF vehicle transmission of the present embodiment having such a configuration, the gear member 12d accommodated in the differential case 6 and the cylindrical member 12e penetrating the through holes 6a and 6b of the differential case 6 are press-contacted. Since the side gears 12A and 12B are formed by being connected by fitting, the gear member 12d constituting the side gears 12A and 12B can be reduced in size and can be easily processed. Further, since the gear member 12d can be inserted into the differential case 6 through the window 6d of the differential case 6 due to the downsizing of the gear member 12d, the differential case 6 can be configured by a single member, thereby reducing weight and cost. be able to. Further, the cylindrical member 12e constituting the side gears 12A and 12B extends through the through holes 6a and 6b to the through holes 3a and 3b of the case 3, and the inner peripheral surface of the through holes 3a and 3b and the outer peripheral surface of the cylindrical member 12e. Since the oil seal mechanisms 14A and 14B are provided therebetween, the oil seal mechanisms 14A and 14B prevent the lubricating oil from flowing out from the through holes 3a and 3b of the case 3 along the outer peripheral surface of the cylindrical member 12e. be able to. Furthermore, since the opening on the pinion gear 11 side of the fitting hole 12f of the gear member 12d constituting the side gears 12A and 12B is closed by the caps 13A and 13B, the lubricating oil penetrates the case 3 along the fitting hole 12f of the gear member 12d. It is possible to prevent the caps 13A and 13B from flowing out of the holes 3a and 3b. Therefore, leakage of the lubricating oil can be prevented even when the drive shafts 15A and 15B are not attached.
[0018]
FIG. 3 shows a side gear 12A of a differential for a FF vehicle transmission according to a second embodiment of the present invention, and steps of respective press-fitting surfaces 12h and 12i connecting the gear member 12d and the cylindrical member 12e. The direction of the shape is opposite to that of the first embodiment. Even with such a configuration, the same effects as those of the first embodiment can be obtained.
[0019]
【The invention's effect】
As described above, according to the differential device for an FF vehicle transmission of the present invention, the gear member inserted into the differential case from the window of the differential case, and the gear member inserted into the differential case and then inserted from the through hole of the differential case The cylinder member is connected by press-fitting to form a side gear, and the oil seal mechanism is arranged between the outer peripheral surface of the cylindrical member extending from the differential case and the inner peripheral surface of the through hole of the case Therefore, it is possible to prevent the lubricating oil from leaking even when the drive shaft is not attached, and to facilitate the processing, reduce the weight, and reduce the cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a differential device for an FF vehicle transmission according to a first embodiment of the present invention.
FIG. 2 is a partial cross-sectional view showing a side gear according to the first embodiment.
FIG. 3 is a partial sectional view showing a side gear of a differential device of an FF vehicle transmission according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a differential device for a conventional FF vehicle transmission.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Differential device 2 Transmission mechanism 3 Case 3a, 3b Through-hole 4 Reduction gear 5 Ring gear 6 Differential case 6A Cover member 6B Housing member 6a, 6b Through-hole 6c Collar 6d Window 7 Bolt 8, 9 Bearing 10 Pinion shaft 11 Pinion gear 12A, 12B side gear 12a gear part 12b cylindrical part 12c hollow part 12d gear member 12e cylindrical member 12f fitting hole 12g insertion hole 12h, 12i pressure contact fitting surface 13A, 13B cap 14A, 14B oil seal mechanism 15A, 15B drive shaft

Claims (2)

It is constituted by a single member so as to have a window at a predetermined position and first and second through holes through which the first and second drive shafts penetrate, and the first and second drive shafts penetrate therethrough. A differential case that is housed inside a transmission case having first and second through holes, and that receives torque from a torque output portion of the transmission and rotates;
A pinion gear that passes through the differential case and is inserted into the differential case, and is rotatably supported by a pinion shaft that rotates integrally with the differential case;
The first and second gear members having a fitting hole that engages with the pinion gear and is spline-fitted with the first and second drive shafts, and through the first and second through holes of the differential case. By doing so, one end is press-fitted to the end of the first and second gear members, and the other end extends outside from the differential case, and an insertion hole through which the first and second drive shafts are inserted First and second side gears comprising first and second cylindrical members,
First and second inserted between inner peripheral surfaces of the first and second through holes of the transmission case and outer peripheral surfaces of portions of the first and second cylindrical members extending from the differential case to the outside. A second oil seal mechanism;
A first cap and a second cap for closing the pinion gear side opening of the fitting hole of the first and second gear members;
The pinion gear, and the first and second gear members are inserted from the window and disposed at predetermined positions inside the differential case,
The first and second cylindrical members are inserted from the first and second through holes of the differential case after the pinion gear and the first and second gear members are inserted into the differential case. And a differential device for a transmission for an FF vehicle, wherein the differential gear is configured to be press-fitted to end portions of the first and second gear members.   2. The FF vehicle transmission according to claim 1, wherein the first gear member and the second gear member are integrated with the first cylindrical member and the second cylindrical member by fitting a stepped pressure contact fitting surface. 3. Differential device.

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