JP3037933B2 - Vehicle braking system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake system for a vehicle, and more particularly, to a left and right axle interlockingly connected to a drive shaft on a prime mover side via a large reduction gear, a small reduction gear and a differential mechanism in a reduction gear case. And a brake device for a vehicle having a friction brake disposed in the reduction gear case.

[0002]

2. Description of the Related Art FIG. 8 shows a prior art of this type of brake device (Japanese Patent Laid-Open Publication No. Sho 59-130791), in which a large reduction gear 10 is placed in a reduction gear case 101 of a final reduction mechanism.
2, a small reduction gear 103 interlockingly connected to the prime mover side,
It has a differential mechanism 104 and has a built-in wet multi-plate friction brake 105 for braking a differential case 106 that rotates integrally with the large reduction gear 102.

[0003] The friction brake 105 is connected to the reduction gear case 10.
1, the lubricating oil for the differential mechanism 104 and the reduction gear can be used for the friction brake, and the large reduction gear 102 is braked by the friction brake 105, so that the left and right drive axles 109 are braked. Is being shared.

The reduction gear case 101 is divided into a left and right case member 110 and a right case member 111. The arrangement of each mechanism and gears in the reduction gear case 101 is different from that of the large reduction gear 102 in the left and right direction. One side of the
For example, the small reduction gear 103 is arranged on the right side and the center O1 of the differential mechanism 104 is located, and the friction brake 105 is arranged on the opposite left side.

[0005] The friction brake 105 is
A plurality of rotary friction plates 113 spline-fitted to a hub 112 fixed to the left case member so as to be movable in the axial direction;
A number of anti-friction plates 114, which are spline-fitted to the inner splines of the inner case 10 so as to be movable in the axial direction, are arranged at the outermost peripheral portions of the left and right case members 110 and 111, and the end face 110a of the left case member 110 and the right side An end face 111a formed in the case member 111 so as to protrude outward is configured to receive a pressing force of the brake.

[0006]

The structure shown in FIG. 8 uses a multi-plate type friction brake 105 which is wider in the axial direction than a single-plate type brake, and a differential mechanism 104 for the large reduction gear 102.
Is arranged on the opposite side (left side) to the arrangement side (right side), a new space for the friction brake must be secured in the reduction gear case 101 on the left side, and the width of the reduction gear case 101 in the left-right direction is reduced. Be larger.

Since the reduction gear case 101 has a left-right split structure, the diameter of the brake holding end face 111 a of the right case member 111 is adjusted to secure an opening area for incorporating the large reduction gear 102. Must be larger than the outside diameter. Therefore, the diameter of the reduction gear case 101 itself increases, and the friction brake 1
The outer diameter of 05 also increases.

When the outer diameter of the reduction gear case 101 is increased, it becomes difficult to secure a minimum ground clearance of the vehicle, and when the outer diameter of the friction brake 105 is increased,
The peripheral speed increases, the power loss due to drag (dragging torque) of the lubricating oil viscosity resistance increases, and the temperature rises faster.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the size of a reduction gear case having large and small reduction gears, a differential mechanism and a friction brake. In addition, the rotation of the differential case forces the lubricating oil into the differential case, releases the lubrication toward the friction plate, and distributes the lubricating oil between the left and right spaces, forcing the inside and outside of the differential case. Another object is to improve the lubrication performance of the friction brake by circulating the lubricating oil and forcibly lubricating the friction brake.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application comprises a small reduction gear 15 interlockingly connected to a drive shaft on a prime mover side, and a large reduction gear engaged with the small reduction gear 15. 16 and a differential mechanism 17 for transmitting power from the large reduction gear 16 to the left and right axles,
The reduction gear case 14 is composed of a cylindrical central case member 23 having left and right end faces open, a left case member 24 having an end wall 24a, and a right case member 25 having an end wall 25a.
The central case member 23 is sandwiched between the left and right side case members 24 and 25 so as to be divided into two parts.
25, and integrally has an inward flange-shaped brake support wall 23a that projects inward in the radial direction so as to receive the pressing force of the friction brake 6 and is integrally formed with the differential case 17 of the differential mechanism 17. A wet multi-plate type friction brake 6 for braking the brake 18 is arranged in the reduction gear case 14, and the friction brake 6 is spline-fitted to the cylindrical inner peripheral surface of the side case member 25 so as to be movable in the axial direction. A plurality of braking friction plates 41 having an outer diameter smaller than the large reduction gear;
8 and a plurality of rotary friction plates 40 that are spline-fitted to the cylindrical outer peripheral surface of the cylinder case 8. The two friction plates 40 and 41 are disposed between the brake support wall 23a and the end wall 25a of the side case member 25, It is characterized in that the two walls 23a and 25a receive the pressing reaction force of the brake.
Thus, the wet multi-plate type friction brake can be disposed by effectively utilizing the space on the outer peripheral side of the differential case, and the reduction gear case can be made compact, particularly in the left-right direction. Further, by using the multi-plate type friction brake, it is possible to maintain compactness in the radial direction. Furthermore, the rotary friction plate of the friction brake is supported on the cylindrical outer peripheral wall of the differential case that houses the differential gear, so that it is not necessary to newly provide a member for supporting the rotary friction plate, and the number of parts is reduced. Savings. Further, by dividing the reduction gear case into three parts, the radial reduction in size can be achieved while ensuring the assemblability of the large reduction gear.

According to a second aspect of the present invention, in the vehicle brake device according to the first aspect, the friction brake 6 is disposed on the outer peripheral side of the cylindrical outer peripheral wall of the differential case 18 which rotates integrally with the large reduction gear 16. And in the region of the cylindrical outer peripheral wall,
In the area where the rotary friction plates 40, 41 of the friction brake 6 are located, the lubricating oil in the differential case 18 is applied to the rotary friction plates 40, 41.
A lubricating oil outlet hole 60 for discharging toward the inner surface of the differential case is formed in a region of the cylindrical outer peripheral wall where the rotary friction plates 40 and 41 of the friction brake 6 are not located. A lubricating oil intake hole 61 for taking lubricating oil is formed in the lubricating oil intake hole 61 by rotating the differential case 18.
The lubricating oil is taken into the differential case 18 from the front and the lubricating oil in the differential case 18 is supplied to the friction brake through the lubricating oil outlet hole 60.
By rotating the differential case with the large reduction gear, the lubricating oil flowing through the lubricating oil intake hole and the lubricating oil outlet hole
The friction brake is actively lubricated by forcibly lubricating the lubricating oil inside and outside the differential case and supplying the lubricating oil to the rotating friction plate.

According to a third aspect of the present invention, in the vehicle brake device according to the first or second aspect, a friction brake is disposed on an outer peripheral side of a cylindrical outer peripheral wall of a differential case that rotates integrally with the large reduction gear. On the outer peripheral wall, a lubricating oil outlet hole is formed at a portion corresponding to the friction brake, and a lubricating oil intake hole is formed at a portion not corresponding to the friction brake. Lubricating oil is taken into the differential case, and the lubricating oil in the differential case is supplied to the friction brake through a lubricating oil outlet hole. When the differential case rotates together with the large reduction gear, the lubricating oil flowing through the lubricating oil intake hole and the lubricating oil outlet hole forcibly circulates the lubricating oil inside and outside the differential case, and lubricates the rotating friction plate. To actively lubricate the friction brakes.

[0013]

[0014]

FIG. 1 is a left side view of an all-terrain vehicle to which the present invention is applied. A pair of left and right driving front wheels 1 and a pair of left and right driven rear wheels 2 are shown. The four-wheeled vehicle of the front-wheel drive type provided with a tire is mounted on each of the wheels 1 and 2 with a balloon tire which is wide and is used at an extremely low air pressure.

The vehicle body is provided with a bar-shaped steering handle 3 and a straddle-type seat 4, a fuel tank 5 is provided between the handle 3 and the seat 4, and a motor 8 is mounted below the fuel tank 5. Step 10 is provided below the seat 4. The steering wheel 3 is connected to the front wheels 1 via a steering shaft 9 and a pitman.
And the front wheel 1 is steered.

In FIG. 2, which shows a plan view of the drive system, a prime mover 8 includes an internal combustion engine, a clutch, a transmission, and the like. A drive shaft 12 extends forward from the transmission, and the drive shaft 12 The left and right front wheels 1 are driven by being linked to the left and right front axles 20 via the small reduction gear 15, the large reduction gear 16 and the differential mechanism 17 in the reduction gear case 14.

FIG. 3 is an enlarged horizontal cross-sectional view of the reduction gear case 14. The reduction gear case 14 includes a central case member 23 disposed at the center of the left and right widths, a left case member 24 having cooling fins 24c, and cooling fins 25b. The central case member 23 is formed into a tubular shape having a narrow left-right width and open right and left ends, and the right case member 25 has a right end wall 25.
The left case member 24 is formed in a bottomed cylindrical shape integrally having a left end wall 24a and an input boss 24b projecting rearward. These three case members 23, 24, 25 are integrally connected by a plurality of fastening bolts 11. The diameter of the right end opening of the left case member 24 is larger than the diameter of the large reduction gear 16 so that the large reduction gear 16 can be inserted in the axial direction.

In the reduction gear case 14, together with the large and small reduction gears 16, 15 and the differential mechanism 17, the large reduction gear 16
A wet multi-plate type brake 6 for braking a differential case 18 that rotates integrally with the brake is disposed. These arrangement relations are as follows. With respect to the large reduction gear 16, the small reduction gear 15 meshing with the large reduction gear 16 at right angles is arranged on the left side, and the differential mechanism 17 is arranged so that the center O1 is on the right side. Of the differential mechanism 17 is disposed on the same side (right side) as the center O1 side of the differential mechanism 17.

The differential mechanism 17 has a well-known basic structure. A pair of left and right large differential gears 30 and a pair of right and left large differential gears 30 mesh with each other in the differential case 18. A pair of differential small gears 31 is provided. The differential case 18 includes a right-side member 18a having a cylindrical outer peripheral wall, and a shallow bottomed left-side cylindrical member 1 integrally connected to a left end opening of the right-side member 18a.
8b, and has boss portions 21 at the left and right ends. The boss portions 21 are rotatably supported on the inner peripheral surfaces of the left and right end walls 24a and 25a of the reduction gear case 14 via ball bearings 27. ing. Left and right axles 20 are fitted into the inner peripheral surface of the boss portion 21 and protrude into the differential case 18. At the end of each axle 20 in the differential case, each large differential gear 30 is provided. Each is splined. Small differential gear 3
1 is rotatably supported by a support shaft 32 fixed to the differential case 18 in a posture perpendicular to the front axle 20. A friction device 35 is disposed between the rear surface of the large differential gear 30 and the end wall of the differential case 18, and the friction device 35 can move axially on the spline portion 30 a of the large differential gear 30. A spline-engaged intermediate friction plate 36a;
A pair of left and right side friction plates 36b which are arranged on both sides in the axial direction of the differential case 18 and are spline-engaged with the spline portions 18d of the left member 18b of the differential case 18 so as to be movable in the axial direction. Disc spring 37 pressed in the direction
, Thereby limiting the differential.

The large reduction gear 16 is fixed to the outer peripheral surface of the differential case 18 using bolts 19 connecting the left and right side members 18b, 18a of the differential case 18, and the differential case 1
8 to rotate integrally. Reduction gear 1
5 is provided at the front end of the drive shaft 12, and the drive shaft 12 is rotatably supported by the input boss 24b via a bearing 33. A protruding portion 15 a is formed at the tip of the reduction gear 15, and the protruding portion 15 a is rotatably supported by the reduction gear case 14 via a needle bearing 34.

The wet multi-plate friction brake 6 is disposed on the same side (right side) as the differential mechanism 17 as described above, and is disposed on the outer peripheral side of the differential case 18 so as to alternate in the axial direction. Are provided with a plurality of rotating friction plates 40 and a plurality of stopping friction plates 41. These friction plates 40, 4
Numeral 1 is disposed between an inward flange-shaped brake support wall 23b formed on the central case member 23 and an end wall 25a of the right case member 25, and the rotating friction plate 40 is connected to the right member 18a of the differential case 18. The outer peripheral spline portion 38 formed on the cylindrical outer peripheral wall of the right case member 25 is movably fitted only in the axial direction, and the stopping friction plate 41 is axially mounted on the inner peripheral spline portion 39 formed on the cylindrical inner peripheral surface of the right case member 25. It is fitted so that it can move only in the direction. A brake plate 42, a steel ball 46 and a cam ring 47 of a cam mechanism are arranged between the rightmost stopping friction plate 41 and the end wall 25a of the right case member 25, and the brake plate 4
By pressing both friction plates 40 and 41 to the left with 2,
The friction plate 4 is provided between the brake support wall 23b and the brake plate 42.
0 and 41 are pressed against each other to brake the differential case 18. The outer diameter of the stopping friction plate 41 is formed smaller than the outer diameter of the large reduction gear 16.

A cam mechanism for driving the brake plate 42 will be described. In FIG. 4, a movable cam groove 44 is formed on the back (right side) of the braking plate 42, and the end wall 25 a of the right case member 25 is formed.
A cam ring 47 having a fixed cam groove 45 is fixed to the
A steel ball 46 is rotatably held between the two grooves 44 and 45. The cam mechanisms are arranged at three locations at equal intervals in the circumferential direction. When the brake plate 42 is rotated in the direction of arrow R in FIG. Reference numeral 42 moves to the left side in FIG.
To the left.

An operation mechanism for rotating the brake plate 42 will be described. As shown in FIG. 5, a pair of outwardly facing projections 50a and 50b are formed on the braking plate 42 so as to face each other in the circumferential direction.
An operation arm 51 that can be inserted between Oa and 50b and engageable with each of the projections 50a and 50b is fixed to a brake shaft 53 rotatably supported by the right case member end wall 25a.
The brake shaft 53 protrudes out of the reduction gear case 14, and a brake arm 55a is fixed to an outer end of the brake shaft 53 so as to protrude rearward. And is urged to a non-braking position indicated by a solid line by a return spring or the like. That is, by rotating the brake arm 55a in the direction of arrow E against a biasing means such as a return spring,
Brake shaft 53, operating arm 51 and one protrusion 50a
The brake plate 42 is rotated in the direction of the arrow R via. In addition, of the two projections 50a and 50b,
The other protrusion 55b is used, for example, when the cam grooves 44 and 45 are configured in the opposite direction to the above so that the cam mechanism is activated by rotating the brake plate 42 in the direction opposite to the arrow R direction. be able to. In this case, the operation arm 51 and the rearwardly projecting brake arm 55a in the state of FIG. 5 are used as they are, and the brake arm 55a is biased by a return spring to the position shown by the imaginary line. By rotating, it is also possible to rotate the braking plate 42 in the direction opposite to the direction of arrow R via the other protrusion 50b, but in order to make it easier to push the other protrusion 50b,
The operation arm 51 can be attached in a direction opposite to the state shown in FIG. 5 (rearward), and a brake arm 55b projecting forward can be attached to the outer end of the brake shaft 53 as shown by a dashed line. That is, by rotating the forwardly projecting brake arm 55b upward, the brake plate 42 is rotated in the direction opposite to the direction of the arrow R via the other protrusion 50b, and the brake plate 42 of FIG. Can be moved to the left.

The structure for storing and circulating the lubricating oil in the reduction gear case 14 will be described. In FIG. 4, lubricating oil is stored in the reduction gear case 14 to a level L at which the lower end of the differential case 18 is immersed. The lower end of the wet multi-plate type friction brake 6 is always immersed in the lubricating oil. It is in a state of being left. In order to forcibly lubricate the friction brake 6,
On the cylindrical outer peripheral wall of the right side member 18a of the differential case 18,
A lubricating oil outlet hole 60 is formed in a region where the rotary friction plates 40 and 41 are located (the outer peripheral spline portion 38).
In the area where 0 and 41 are not located, the brake support wall 23
b, a lubricating oil intake hole 61 is formed in the left region, and a communication hole 6 penetrating left and right is formed in the brake support wall 23b.
4 are formed.

In FIG. 6, which is a schematic perspective view of the differential case 18, a plurality of lubricating oil intake holes 61, lubricating oil outlet holes 60, and communication holes 64 are formed at intervals in the circumferential direction. The lubricating oil intake hole 61 is formed to be long in the circumferential direction, and the rotation of the differential case 18 takes in the stored lubricating oil at the lower portion of the differential case into the differential case 18. On the other hand, the lubricating oil outlet hole 60 is formed in a substantially circular shape, and the lubricating oil in the differential case 18 is discharged to the two friction plates 40 and 41 to the outside by the rotation of the differential case 18. By forming a guide wall at the rear end of the lubricating oil intake hole 61 in the rotation direction, the intake performance can be improved. In FIG. 3, a breather 63 regulates the pressure inside the reduction gear case 14 and extends upward as shown in FIG. 1 and curves downward near the steering handle 3.

[0026]

In FIG. 3, the operation of the differential mechanism 17 is well known, and the rotation of the drive shaft 12 causes the large reduction gear 16 and the differential case 18 to rotate integrally via the small reduction gear 15; The left and right axles 20 are rotated via the small differential gear 31 and the large differential gear 30. When the loads on the left and right front wheels 1 (FIG. 2) are substantially equal, the left and right wheels rotate at a constant speed, and when the difference between the left and right loads is large, such as when turning, the differential is performed by rotation of the small differential gear 31. .

In order to brake the left and right front wheels 1 simultaneously,
When the large reduction gear 16 and the differential case 18 shown in FIG. 4 are braked, the brake arm 55a, the brake shaft 53, the operation arm 51, and the projection 50a shown in FIG. The brake plate 42 is rotated in the direction of the arrow R via the arrow, and the brake plate 42 is moved to the left by the cam mechanism shown in FIG. As a result, both friction plates 40 and 41 are moved to the left, and are brought into pressure contact between the brake plate 42 and the brake support wall 23b to brake the differential case 18 and the large reduction gear 16. In this case, the pressure receiving surface (right surface) of the brake support wall 23 b of the central case member 23 and the end wall 25 a of the right case member 25 receive the pressing reaction force of the brake.

When the differential case 18 is rotated by the rotation of the drive shaft 12, as shown by the arrow in FIG.
1, the lubricating oil taking-in operation from the lubricating oil outlet hole 60 toward the friction plates 40 and 41 in FIG.
The lubricating oil flows between the left and right spaces to forcibly circulate inside and outside the differential case 18 to forcibly lubricate the friction brake 6 and forcibly cool the friction plates 40 and 41. Thereby, improvement of lubrication performance and cooling performance and cost reduction can be achieved. That is, the friction brake 6 is disposed on the cylindrical outer peripheral wall of the differential case 18, and the lubricating oil outlet hole 60 is formed in a portion corresponding to the friction brake 6, and the lubricating oil intake hole 61 is formed in a portion not corresponding to the friction brake 6. Then, the rotation of the differential case 18 supplies the lubricating oil to the outer friction brake 6 from the lubricating oil outlet hole 60, and the lubricating oil intake hole 6
When the lubricating oil is taken into the differential case 18 from the first, the lubricating oil is forcibly circulated by the rotation of the differential case 18 and the friction plate 40 is provided without providing a special lubricating oil pressure feeding mechanism such as a pump. , 41 can be forcibly cooled, thereby improving lubrication performance and reducing costs.

The reduction gear case 14 is divided into three parts: a center part and a left part, and an inward brake support wall 23b is formed in the center case member 23. The brake support wall 23b and one of the left and right case members, for example, the right case member By receiving the pressing reaction force of the friction brake 6 with the end wall 25 a of the brake 25, the outer diameter of the brake is smaller than the outer diameter of the large reduction gear 16, but the large reduction gear 16 and the friction brake 6 Assembling of the friction plates 40 and 41 becomes possible. That is, after inserting the friction plates 40 and 41 into the right case member 25, the center case member 23 and the differential case 18 are assembled, and then the left case member 24 is assembled to the center case member 23, thereby easily assembling. be able to.

[0030]

[Other Embodiments] (1) FIG. 7 shows a structure in which a reduction gear case 14 is divided into three parts at the center and left and right, and a small reduction gear 15 is disposed on the left side with respect to the large reduction gear 16, and a differential gear is similarly provided on the left side. This is an example in which the differential mechanism 17 is arranged such that the center O1 of the mechanism 17 is located, and the wet multi-plate friction brake 6 is arranged on the opposite side (right side) of the differential mechanism 17. The rotary friction plate 40 of the friction brake 6 is fitted to the outer peripheral spline portion of the cylindrical hub 70 fixed to the differential case 18 so as to be movable only in the axial direction. Other structures are basically the same as those of FIG. 3, and the same components are denoted by the same reference numerals.

(2) The present invention can be applied to a vehicle of a rear wheel drive system, and the present invention can be applied to a vehicle having an annular handle.

(3) The invention is not limited to vehicles for traveling on uneven terrain, but can be applied to four-wheel vehicles such as work vehicles.

[0033]

As described above, according to the present invention,
In a vehicle provided with a friction brake in a reduction gear case having a large reduction gear, a small reduction gear, and a differential mechanism, a small reduction gear meshing with the large reduction gear is arranged on one of the left and right sides, and a differential mechanism is provided on the left and right sides. Arrange so that the center is on the other side,
By disposing a wet-type multi-plate type friction brake for braking the differential case on the other side and on the outer peripheral side of the differential case, or by reducing the reduction gear case to the central case member and the left and right case members. By dividing into three, the reduction gear case can be made compact as described below.

(1) By arranging the center of the differential case and the friction brake on the same side with respect to the large reduction gear, the friction brake is arranged by effectively utilizing the outer peripheral space of the differential case. Accordingly, the width of the reduction gear case can be made compact.

(2) The reduction gear case has a three-part structure,
By forming an inward brake support wall on the central case member and using it as the pressure receiving surface of the friction plate, it is possible to install a large-diameter large reduction gear after incorporating a friction brake with a smaller diameter than the large reduction gear. Becomes That is, a friction brake having a smaller diameter than the large reduction gear can be incorporated, and compactness in the radial direction can be maintained. In addition, this allows a high minimum ground clearance to be secured, which is suitable for vehicles running on uneven terrain.

(3) A spline is formed on the cylindrical outer peripheral wall of the differential case, and the rotary friction plate of the friction brake is directly spline-fitted and supported on the outer peripheral wall of the operating case. It is not necessary to install a hub or the like, so that the number of parts can be saved and the friction brake can be further reduced in the radial direction.

(4) A friction brake is disposed on the cylindrical outer peripheral wall of the differential case, a lubricating oil outlet hole is formed in a portion corresponding to the friction brake, and a lubricating oil intake hole is formed in a portion not corresponding to the friction brake. When the lubricating oil is supplied from the lubricating oil outlet hole to the outer friction brake by the rotation of the differential case and the lubricating oil is taken into the differential case from the lubricating oil intake hole, special Even without providing a lubricating oil pressure feeding mechanism, the lubricating oil can be forcibly circulated by the rotation of the differential case, and the friction plate can be forcibly cooled, so that an improvement in lubrication performance and a reduction in cost can be achieved.

[Brief description of the drawings]

FIG. 1 is a left side view of a vehicle to which the present invention is applied.

FIG. 2 is a plan view showing the drive system of FIG.

FIG. 3 is an enlarged horizontal sectional view of the reduction gear case of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a schematic perspective view of a differential case.

FIG. 7 is a horizontal sectional view showing a modification of the present invention.

FIG. 8 is a horizontal sectional view of a conventional example.

[Explanation of symbols]

 Reference Signs List 8 prime mover 12 drive shaft 14 reduction gear case 15 reduction small gear 16 reduction large gear 17 differential mechanism 18 differential case 23 central case member 24 left case member 25 right case member 30 differential large gear 31 differential small gear 38 outer peripheral spline portion Reference Signs List 40 rotating friction plate 41 stopping friction plate 42 brake plate 60 lubricating oil outlet hole 61 lubricating oil intake hole

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor ▲ Taka Izumi 1-1, Kawasaki-cho, Akashi-shi, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Inside Akashi Factory (56) References JP-A-59-190046 (JP, A) JP-A-61-211561 (JP, A) JP-A-61-262248 (JP, A) JP-A-59-130791 (JP, A) JP-A-54-135435 (JP, U) JP-A-59-8880 (JP, A) (JP, U) JP 47-26615 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60T 1/06 F16H 48/30 F16H 57/02 531

Claims (2)

(57) [Claims] 1. A small reduction gear 15 operatively connected to a drive shaft of a prime mover, and a large reduction gear 1 meshed with the small reduction gear 15.
6 and a differential mechanism 17 for transmitting power from the large reduction gear 16 to the left and right axles in a single reduction gear case 14. A cylindrical central case member 23, a left case member 24 having an end wall 24a, and a right case member 25 having an end wall 25a.
The central case member 23 is divided into left and right side case members 24 and 25.
Between the two case members 24 and 25, and integrally formed with an inward flange-like brake support wall 23a that projects inward in the radial direction so as to receive the pressing force of the friction brake 6. A wet multi-plate type friction brake 6 for braking a differential case 18 of a differential mechanism 17 is disposed in the reduction gear case 14. The friction brake 6 is a cylindrical inner peripheral surface of a side case member 25. A plurality of stopping friction plates 41 which are spline-fitted to be able to move in the axial direction and have an outer diameter smaller than that of the large reduction gear, and a plurality of rotary friction plates 40 which are spline-fitted to the cylindrical outer peripheral surface of the differential case 18. The two friction plates 40, 41 are provided with the brake support wall 23a.
A brake device for a vehicle, wherein the brake device is disposed between an end wall 25a of the side case member 25 and the two walls 23a, 25a to receive a pressing force of the brake. 2. The differential case 1 according to claim 1, wherein the differential case 1 rotates integrally with the large reduction gear 16.
8, a friction brake 6 is arranged on the outer peripheral side of the cylindrical outer peripheral wall,
A lubricating oil for discharging the lubricating oil in the differential case 18 toward the rotary friction plates 40 and 41 in a region of the cylindrical outer peripheral wall where the rotary friction plates 40 and 41 of the friction brake 6 are located. A lubricating oil for taking in lubricating oil from outside the differential case into the differential case is formed in an area where the rotary friction plates 40 and 41 of the friction brake 6 are not located in the area of the cylindrical outer peripheral wall where the outlet hole 60 is formed. The intake hole 61 is formed, and the differential case 1 is formed.
The lubricating oil is taken from the lubricating oil intake hole 61 into the differential case 18 by the rotation of the rotation 8, and the lubricating oil in the differential case 18 is supplied to the friction brake from the lubricating oil outlet hole 60. Vehicle braking device.