JPH04231760A - Differential gear - Google Patents

Abstract

PURPOSE: To provide the structure of a light cover to be manufactured at a low cost by centering the cover in a cylindrical hole for driven shaft gear through a centering projection provided in the cover itself. CONSTITUTION: Covers 103, 104 provided in a differential case 101 close at least one of cylindrical holes 105, 106 for driven shaft gears 109, 110 so as to hold the driven shaft gears 109, 110 in the axial direction. Centering of the covers 103, 104 is performed inside of the cylindrical holes 105, 106 through outside centering projections 107, 108. The covers 103, 104 have projecting parts 129, 130 for receiving a bearing for the differential case 101. Notches of a peripheral part of the covers 103, 104 partially open holes 115, 116 for supporting multiple differential gears 117, 118 axially parallel with each other, and the differential gears 117, 118 are positioned by the covers 103, 104 in the axial direction, and the lubricant can achieve the differential gears 117, 118.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a differential device comprising a driveable differential case rotatably supported within a device housing, the differential case having a driveable differential case rotatable within a cylindrical bore. Two driven shaft gears coaxial with each other are arranged so that they can be held together, and a number of differential gears are mounted in a differential case and move circularly together with the differential case, each differential gear partially is in mesh with and intermeshed with one of the driven shaft gears, and the differential case is provided with at least one lid, the lid connecting the at least one cylindrical hole for the driven shaft gear to the driven shaft. Relating to a closed form for holding in direction.

0002

2. Description of the Related Art In this type of differential, when two driven shaft gears are inserted into a differential case from one end via a spacer or from both ends into a cylindrical hole in the case, both One or two lid sections are required to axially position the driven shaft gear. If the differential has a number of differential gears held in axis-parallel bearing bores, such a lid part can also be used for the axial positioning of these differential gears. In this case, all the bearing holes for the differential gear can be closed by one cover if all the bearing holes are drilled from only one end of the differential housing. However, in order to axially position the differential gear that meshes with the driven shaft gear located deep within the cylindrical hole, a spacer or support disk must be provided for the differential gear. The spacer may be provided directly on the differential gear or press-fit into the bearing hole. The support disc is disposed between the driven shaft gears and partially extends into the bore for the differential gear. Centering with respect to the differential case is required since the lid typically includes a sealing member for the driven shaft passing through the lid. This centering is particularly necessary if the lid has a coaxial projection onto which the bearing member for the device housing fits.

It is known that the differential case has an outer centering fitting part, and a lid member having an inner centering collar is inserted into the fitting part. This centering portion is located outside the axis-parallel differential gear hole.

[0004]Such an arrangement necessarily involves a number of disadvantages, which are of greater importance depending on whether there is only one lid or two lids. That is, the lid must be compatible in diameter with the differential case. In short, they must be made of at least the same size, which results in an undesirably high weight. Since the holes for the many axially parallel differential gears are blocked by the lid, the supply of lubricating oil is impeded, so that oil holes must be formed in the lid or in the middle of the case. To ensure sufficient centering of the lid, the case middle part of the differential case must have an approximately cylindrical outer shape, although a different shape would be advantageous in terms of weight.

[0005]

OBJECTS OF THE INVENTION It is an object of the invention to enable a construction of the lid in a differential of the type mentioned at the outset, which is advantageous in terms of weight and inexpensive in terms of manufacturing technology, and which provides additional benefits. The purpose is to provide other advantages as well.

[0006]

[Means for Solving the Problems] The present invention has solved these problems as follows. That is, at least one lid is centered in one cylindrical bore for the driven shaft gear via an outer centering projection.

The cylindrical hole provided to support the driven shaft gear has sufficient fitting precision so that it can also be used for centering the lid member, or has such a fitting precision. can be formed without any significant increase in cost. Therefore, a step for providing a separate centering section in the middle of the case is not necessary. As a result, the outer shape of the intermediate housing part can also be advantageously shaped so that it has approximately the same wall thickness in the area of the bearing opening for the differential gear, and the mass can therefore also be significantly reduced. The outer shape in this case is non-circular with a partially cylindrical ridge around the periphery.

[0008]According to a particularly advantageous embodiment, the contour of the end face of the lid which extends beyond the centering lug is designed to be irregular in the circumferential direction, so that on the one hand it is sufficient to secure the lid in the middle part of the housing. A large number of differential gears with a large screw-receiving surface and parallel to the axis on the other side are axially positioned in the bearing hole, and the cross-section of the bearing hole is left partially open to allow lubricant to enter. It is also possible to make it possible.

If the differential gear is axially positioned in this way by the lid, the centering projection can be provided with circumferentially distributed recesses for the tooth tips of the differential gear. In order to enable the lid to hold the differential gear in its axial position in the case of a centering projection that does not have a circumferential notch, a toothless pin-shaped projection is provided on the end face of the differential gear on the lid side. It is also possible to provide a pin-like protrusion so that the pin-like protrusion rests on a protruding end face of the lid. According to another embodiment, the aforementioned pin-like projection is omitted by clamping and holding a separate support disc for the differential gear between the end face of the differential gear and the projecting centering projection of the lid. can do.

The configuration of the present invention includes a differential device with equal torque distribution, a differential device with unequal torque distribution in which the size of the driven shaft gear is different, and a differential device in which the differential gears are distributed unevenly in the circumferential direction. It can be applied to differentials, and also to differentials in which the differential gears are not arranged axially parallel or have a different configuration. In this case, the types of teeth of the driven shaft gear and the differential gear, ie, the types of teeth such as straight teeth, helical teeth, or pitch teeth of different types in the case of differential gears, are arbitrary.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained according to three embodiments shown in the drawings. 1, 2 and 3 each show one case middle part 102, 202, 302 and two lid parts 103, 203, 303; 104, 204, 304.
A differential case 101, 201, 301 is shown. Lid part 103, 203, 303; 104, 204
, 304 are axial cylindrical holes 105, 205, 305; 1
06,206,306, and within these cylindrical holes centering projections 107,207,307;108
, 208, 308. Axial cylindrical holes 105, 205, 305; 106, 20
Driven shaft gears 109, 209, 309; 110, 210, 310 are held within 6, 306 by the lid portion. In the driven shaft gear, there is a driven shaft 111, 211, 311;
12, 212, 312 are inserted. Blind hole 115, 215, 315;
6,316 are formed, and differential gears 117, 217, 317; 118, 218, 318 are formed in these blind holes.
is inserted. All blind holes have centering protrusion 1
07, 207, 307; Lid end surface 119, 219, 319; 120, 2 protruding beyond 108, 208, 308
20, 320, which allows lubricant to flow from the remaining open cross-sectional section of the blind hole to the differential gear 1.
17,217,317; 118,218,318 can be reached. Furthermore, this lid end surface 119, 219,
319; 120, 220, 3210 are fixing screws 121,
221, 321; 122, 222, 322 have room to form fixing holes therethrough. Lid part 103, 203
, 303; 104, 204, 304, the bearing seat 131
, 231, 331; 132, 232, 332 protrusion 129, 229, 329; 130, 23
0,330 is provided.

FIG. 1b shows the asymmetrical contour of the lid end surface 119. Four blind holes 115 distributed in the circumferential direction
, with the differential gear 117 held inside, is partially closed off by a lid part, which at the same time forms a support surface for the fastening screw 121 .

In the embodiment of FIG. 1, the differential gear 117;
18, a notch 123; 124 is formed in the collar-shaped centering projection 107; 108, which provides free space for the teeth of the differential gear 117; It contacts the end surfaces 119 and 120.

In the embodiment of FIG. 2, the centering projection 2
07; 208 remains completely uninterrupted over the entire circumference; instead, the differential gears 217; 218 have axial projections 225;
19; is in contact with 220.

In the embodiment according to FIG. 3, the centering projections 307; 308 are again produced without interruption in the circumferential direction, as in the embodiment according to FIG. However, the differential gears 317 and 318 do not have an axial extension. Instead, between the driven shaft gear 309; 310 and the centering projection 307; 308 of the lid part 303;
28 is inserted, and a differential gear 217 is inserted into this support disk.
;318 is in contact.

[Brief explanation of the drawing]

1 is a longitudinal sectional view and a transverse sectional view showing a first embodiment of a differential case of a differential device according to the present invention, divided into FIG. 1a and FIG. 1b; FIG.

FIG. 2 is a longitudinal sectional view showing a second embodiment.

FIG. 3 is a longitudinal sectional view showing a third embodiment.

[Explanation of symbols]

101, 201, 301 Differential case 102, 202
, 302 Case middle part 103, 203, 303, 1
04,204,304 Lid 105,205,305,
106, 206, 306 Cylindrical hole 107, 207, 307, 108, 208, 308
Centering protrusion 109, 209, 309, 110, 210, 310
Driven shaft gear 115, 215, 315, 116, 216, 316
Blind hole 117, 217, 317, 118, 218, 318
Differential gear 119, 219, 319, 120, 220, 320
Lid end surface 327, 328 Support disk

Claims (13)

[Claims] 1. A differential device comprising a drivable differential case rotatably supported within a device housing;
Inside the differential case are two mutually coaxial driven shaft gears rotatably held in a cylindrical bore, and a number of differential gears supported within the differential case and moving circularly together with the differential case. wherein the differential gears are each partially intermeshing with and intermeshed with one of the driven shaft gears, and the differential case is provided with at least one lid, the lid being at least one of the driven shaft gears. 1
In the type in which the two cylindrical holes are closed for axial retention of the driven shaft gear, at least one lid (103, 203, 303; 104, 204, 304
) is the driven shaft gear (109, 209, 309; 1
one cylindrical hole (105,2
05,305; 106,206,306) within the outer centering protrusion (107,207,307; 108,2
08,308). Claim 2: At least one lid (103, 203
, 303; 104, 204, 304) is different from the differential case (
101, 201, 301) for receiving bearings (129, 229, 329; 130, 230, 33)
0). The differential device according to claim 1, wherein the differential device has: 0). Claim 3: At least one lid (103, 203
, 303; 104, 204, 304) have notches in their edges, and these notches are used to form a number of axis-parallel differential gears (117, 217, 317; 118, 218, 318).
Holes (115, 215,
315; 116, 216, 316) are partially opened, which allows the differential gear to move in the axial direction from the lid (103, 2
3. The differential gear according to claim 1 or 2, wherein the differential gear is positioned by a lubricant (03,303; 104,204,304) and is accessible to the differential gear. 4. At least one lid (103; 104
) centering projections (107; 108) are notched (1
4. The differential device according to claim 1, wherein the differential gear has a plurality of notches (23; 124), and the tips of the differential gears (117; 118) are inserted into these notches. 5. At least one lid (203; 204
) has toothless pin-shaped projections (225; 226);
4. Differential device according to claim 1, wherein the differential gear is supported via this pin-shaped projection on a lid part (203; 204) that projects beyond the centering projection. 6. At least one lid (303; 304
one support disk ( 327; 328) are fixed, and the support disc (327; 328) is partially fixed to the differential gear (327; 328).
4. The differential gear according to claim 1, wherein the differential gear is inserted into a bore for a motor (117, 217, 317; 118, 218, 318). 7. One cylindrical hole is provided for both driven shaft gears, and one cylindrical hole is provided between both driven shaft gears.
7. Differential device according to claim 1, wherein one spacer is inserted. 8. An axially parallel hole for the differential gear is formed from the same side as the cylindrical hole for the driven shaft gear, and the differential gear that meshes with the rear driven shaft gear in the cylindrical hole is axially parallel to the driven shaft gear by the spacer. Claim 7
The differential device described in . Claim 9: Driven shaft gear (109, 209,
309; 110, 210, 310) cylindrical hole (105
, 205, 305; 106, 206, 306) are provided from both sides of the differential case (101, 201, 301), each with one lid (103, 203, 303; 1
9. The differential device according to claim 1, wherein the differential device is closed by a differential (04,204,304). Claim 10: Differential gear (117, 217, 317
;118,218,318) holes (115,215,
10. Differential device according to claim 9, wherein the differential case (101, 201, 301) is partially formed from both sides of the differential case (101, 201, 301). [Claim 11] Case middle part (102, 202, 3
02), the differential gear (117, 217, 317; 11
8 , 8 , 218 , 318 ), wherein all the bores for bearing the differential gear are designed as axial through bores of constant internal cross section. 8 . . [Claim 12] Differential gear (117, 217, 317
; 118, 218, 318) is positioned by a support disc (327, 328), which supports the driven shaft gear (109, 209, 30).
9; 110, 210, 310),
Partially differential gears (117, 217, 317; 118,
12. The differential according to claim 11, wherein the differential is inserted into a bearing hole for a shaft (218, 318). Claim 13: Driven shaft gear (109, 209
, 309; 110, 210, 310) have mutually different diameters, resulting in an unequal torque distribution to the driven shafts.