JP4574511B2 - Vehicle differential device - Google Patents

Description

  The present invention relates to a differential apparatus mounted on a vehicle such as an automobile, and more particularly to lubrication of a differential gear mechanism housed in a differential case.

  For example, a differential device mounted on an automobile has a structure including a differential case in which a differential gear mechanism is accommodated and a differential housing that accommodates the differential case and rotatably supports the differential case.

  In this type of differential device, in order to prevent seizure and wear of the differential gear mechanism, a lubricating oil inflow window is formed on the outer peripheral portion of the differential case, and the lubricating oil is forced to flow from the lubricating oil inflow window. I have to.

In this case, it is necessary to efficiently supply the lubricating oil from the lubricating oil inflow window into the rotating differential case. For this reason, for example, it is conceivable that a pipe is connected to a lubricating oil passage communicating with an oil pump, and the pipe is routed in the differential housing so that a discharge port thereof is directed to the lubricating oil inflow window (for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-26018

  By the way, when the pipe is routed in the differential housing as in the above-described conventional device, the pipe and a special dedicated part for routing the pipe are required without interfering with other parts, and the number of parts is accordingly increased. There is a problem that the cost increases as the cost increases.

  The present invention has been made in view of the above-described conventional situation, and an object of the present invention is to provide a vehicle differential apparatus that can efficiently supply lubricating oil into a differential case without requiring special dedicated parts. It is said.

  The present invention includes a differential case in which a differential gear mechanism is accommodated and a lubricating oil inflow window is formed in an outer peripheral portion, a differential housing that accommodates the differential case and rotatably supports the outer periphery of the differential case in the differential housing A differential plate for a vehicle provided with a separate plate disposed so as to substantially surround the portion, an opening portion of a lubricating oil passage communicating with an oil pump is disposed at a portion directed to the lubricating oil inflow window of the differential case, Surrounding the oil path connecting the opening and the substantially central portion of the differential case with the separate plate and a rib formed on the inner wall of the differential housing so as to intersect the rotational direction of the differential case, A passage hole is formed in the portion facing the oil path to allow the lubricating oil ejected from the opening to pass therethrough.

  According to the vehicle differential apparatus of the present invention, the oil path connecting the opening of the lubricating oil passage and the substantially central portion of the differential case is surrounded by the separate plate and the rib formed on the differential housing, and the separate Lubricating oil passage holes are formed in the plate, so that the lubricating oil ejected from the opening is supplied from the passage hole toward the lubricating oil inflow window of the differential case through an oil path surrounded by the separate plate and ribs. Will be. Thus, since the circumference of the oil path is surrounded by the separate plate and the rib, the above-excited lubricating oil is not stirred by the rotation of the differential case, and the lubricating oil can be efficiently supplied into the differential case, The seizure of the differential gear mechanism can be prevented.

  Further, in the present invention, since the oil path is surrounded by the existing separate plate and the existing rib formed to increase the rigidity of the differential housing, an independent oil path can be formed without using any special dedicated parts. And increase in the number of parts and cost can be avoided.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 to FIG. 4 are diagrams for explaining a vehicle differential device according to an embodiment of the present invention. FIG. 1 is an overall configuration diagram of a belt-type continuously variable transmission including the differential device, and FIG. 3 is a side view of the step transmission, FIG. 3 is a side view of the differential device, and FIG. 4 is a cross-sectional view of the differential device.

  In the figure, reference numeral 1 denotes a belt type continuously variable transmission integrally coupled to a crankshaft horizontal engine (not shown) mounted on an automobile. This belt-type continuously variable transmission 1 includes an input shaft 4 disposed in a casing 2 so as to be coaxial with the crankshaft 3, a planetary gear mechanism 5 attached to the input shaft 4, and the input shaft 4 The belt-type continuously variable transmission mechanism 6 to which the rotation of the continuously variable transmission mechanism 6 is transmitted via the planetary gear mechanism 5 and the differential device 7 for transmitting the rotation of the continuously variable transmission mechanism 6 to the left and right output shafts 8 and 8 are accommodated. It has a configuration. An axle 8b is connected to the left and right output shafts 8 and 8 via a universal joint 8a.

  A torque converter 9 that transmits rotation of the crankshaft 3 to the input shaft 4 is attached to the input shaft 4. In addition, 9a is a lockup clutch and 9b is a starter gear.

  The planetary gear mechanism 5 performs a forward / reverse switching operation, and a plurality of pinion gears are provided between a sun gear 4a formed integrally with the input shaft 4 and a ring gear 20 coupled to a primary shaft 13 described later. 21 has a schematic structure including a clutch 21a and a brake 21b for controlling the operation of the pinion gear 21 and the like.

  The belt type continuously variable transmission mechanism 6 includes the primary shaft 13 disposed so as to be coaxial with the input shaft 4, a secondary shaft 16 disposed in parallel with the primary shaft 13, and a primary of the primary shaft 13. A metal V-belt 12 wound around the sheave 10 and the secondary sheave 11 of the secondary shaft 16 is provided.

  The primary sheave 10 is transmitted with the rotation of the input shaft 4, the fixed sheave 13 a formed integrally with the primary shaft 13, the movable sheave 14 inserted and attached to the primary shaft 13 so as to be movable in the axial direction, The movable sheave 14 has a hydraulic plate 15 that forms a hydraulic control chamber 15a.

  The secondary sheave 11 includes a fixed sheave 16 a integrally formed with the secondary shaft 16, a movable sheave 17 inserted in the secondary shaft 16 so as to be movable in the axial direction, and the movable sheave 17. And a hydraulic plate 18 that forms A small reduction gear 16b is splined to the inner end of the secondary shaft 16, and the ring gear 7a of the differential device 7 is meshed with the reduction small gear 16b.

  The differential device 7 includes a differential case 26 in which the differential gear mechanism 25 is accommodated, and a differential housing 27 that accommodates the differential case 26 and rotatably supports it. A plurality of lubricating oil inflow windows 26 e for supplying lubricating oil to the differential gear mechanism 25 are formed on the outer peripheral portion of the differential case 26.

  The differential gear mechanism 25 includes a pair of left and right side gears 28 and 28 coupled to the left and right output shafts 8 and 8, and a pair of upper and lower side gears meshed with the left and right side gears 28 and 28. Pinion gears 29, 29 and a pinion shaft 30 for connecting the upper and lower pinion gears 29 are provided.

  The differential housing 27 is divided into a left housing part 27a and a right housing part 27b fixed to the left housing part 27a with bolts. Boss portions 27c and 27c for rotatably supporting the differential case 26 via bearings 31 and 32 are formed on the left and right housing portions 27a and 27b.

  A plurality of ribs 27e to 27i are integrally formed on the upper side portion of the inner wall of the right housing portion 27b. Each of the ribs 27e to 27i is for increasing the rigidity of the differential housing 27, extends radially from the boss portion 27c toward the outer end portion, and extends in a direction perpendicular to the rotation direction of the differential case 26. .

  The differential case 26 has a structure in which left and right case portions 26 a and 26 b are coupled with the pinion shaft 30 interposed therebetween. Boss portions 26c and 26c are formed in the left and right case portions 26a and 26b, and the left and right boss portions 26c are connected to the left and right boss portions 27c of the differential housing 27 via the bearings 31 and 32, respectively. Is supported by

  A flange portion 26d is formed on the outer peripheral wall of the left case portion 26a, and the differential ring gear 7a is bolted to the flange portion 26d. The diff ring gear 7 a is disposed at a position displaced to the left with respect to the pinion shaft 30.

  A separate plate 35 is disposed in the differential housing 27. The separate plate 35 includes a generally bowl-shaped separate body 35a that surrounds the outer peripheral portion of the right case portion 26b, and a flange portion 35b that is bent and extends in the radial direction along the diffring gear 7a from the outer peripheral edge of the separate body 35a. Have.

  The right end portion of the separate body 35a is in contact with the inner peripheral surface of the boss portion 27c of the right housing portion 27b, and the flange portion 35b is fixed to the right housing portion 27b with bolts.

  The separation plate 35 defines the inside of the differential housing 27 into a lubricating oil stirring chamber A in which the differential ring gear 7a is disposed and a storage chamber B in which the lubricating oil scraped up by the rotation of the differential ring gear 7a is stored. Yes. Thereby, the stirring resistance due to the rotation of the diff ring gear 7a is reduced. A cutout portion 35c is formed in the upper side of the flange portion 35b to allow the lubricating oil in the stirring chamber A that has been scraped up to flow into the storage chamber B side.

  The separate main body 35a and the flange portion 35b are formed so as to substantially abut along the ribs 27e to 27i. Further, an oil reservoir portion 36 is formed by one rib 27i and the separate plate 35 to collect a part of the lubricating oil scraped up by the diff ring gear 7a and supply it to each lubricating portion such as the bearing 32. .

  A pump body 38 having a built-in hydraulic pump (not shown) is disposed at a portion communicating with the differential housing 27 in the casing 2. The pump body 38 is formed with a lubricating oil passage 38a for supplying pressurized lubricating oil to each lubricating portion.

  An opening 38b is formed in a portion of the lubricating oil passage 38a of the pump body 38 closest to the differential case 26 so as to be directed to the lubricating oil inflow window 26e of the differential case 26. The opening 38b is formed with an orifice 38c through which lubricating oil is ejected at an increased flow rate.

  The circumference of the linear oil path a that connects the opening 38a and the rotation center of the pinion shaft 30 that is a substantially central portion of the differential case 26 is surrounded by the separate plate 35 and the pair of ribs 27e and 27f. ing. Specifically, an independent oil passage a is formed by the flange portion 35b of the separate plate 35 and a pair of ribs 27e and 27f formed so as to be in contact with and parallel to the flange portion 35b. .

  A portion of the separate plate 35 facing the oil path a is formed with a passage hole 35d through which the lubricating oil ejected from the opening 38b passes. As a result, the lubricating oil ejected from the opening 38b is supplied from the oil path a through the passage hole 35d to the outer peripheral portion of the differential case 26, flows from the lubricating oil inflow window 26e, and is supplied to the differential gear mechanism 25. .

  According to the present embodiment, the opening 38 b is formed in the portion of the lubricating oil passage 38 a formed in the pump body 38 closest to the differential case 26, and substantially passes through the opening 38 b and the lubricating oil inflow window 26 e of the differential case 26. The periphery of the oil passage a connecting the center portion is surrounded by a separate plate 35 and a pair of ribs 27e and 27f formed in the differential housing, and the lubricating oil passes through a portion corresponding to the oil passage a of the separate plate 35. Since the passage hole 35d is formed, the lubricating oil ejected from the opening 38b flows through the oil path a surrounded by the separate plate 35 and the ribs 27e and 27f from the passage hole 35d into the lubricating oil in the differential case 26. It will be supplied toward the window 26e. Thus, since the circumference of the oil path a is surrounded by the separation plate 35 and the ribs 27e and 27f, the jetted lubricating oil is not agitated by the rotation of the differential ring gear 7a of the differential case 26, and the lubricating oil is not stirred. The differential gear mechanism 25 in the differential case 26 can be efficiently supplied, and seizure and wear of the differential gear mechanism 25 can be prevented.

  In the present embodiment, the existing separate plate 35 for reducing the stirring resistance due to the rotation of the diff ring gear 7a and the existing ribs 27e and 27f formed to increase the rigidity of the differential housing 27 are used effectively. Since the oil path a is formed, an independent oil path a can be configured without requiring any special dedicated parts, and an increase in the number of parts and cost can be avoided.

  In the above embodiment, the differential device for the V-belt type continuously variable transmission has been described as an example. However, the present invention can also be applied to a differential device such as a multi-plate clutch continuously variable transmission or a manual transmission. .

1 is an overall configuration diagram of a belt-type continuously variable transmission including a differential device according to an embodiment of the present invention. It is a side view of the said belt type continuously variable transmission. It is a side view of the said differential apparatus. It is sectional drawing of the said differential apparatus.

Explanation of symbols

7 Differential device 25 Differential gear mechanism 26 Differential case 26e Lubricating oil inflow window 27 Differential housing 27e, 27f Rib 35 Separate plate 35d Passing hole 38a Lubricating oil passage 38b of pump body Opening a Oil path

Claims (1)

  A differential case that houses the differential gear mechanism and has a lubricating oil inflow window formed on the outer periphery thereof, a differential housing that houses the differential case and supports it rotatably, and substantially surrounds the outer periphery of the differential case in the differential housing In the differential apparatus for a vehicle having a separate plate arranged as described above, an opening portion of a lubricating oil passage communicating with an oil pump is disposed at a portion directed to the lubricating oil inflow window of the differential case. The periphery of the oil path connecting the substantially central portion of the differential case is surrounded by the separate plate and a rib formed on the inner side wall of the differential housing so as to intersect the rotation direction of the differential case, and faces the oil path of the separate plate. A vehicle differential having a passage hole through which lubricating oil ejected from the opening is allowed to pass. Shall apparatus.

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