JPH1129013A - Braking device for buggy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To brake the rear wheels of a buggy with reliability by producing sufficient braking force of a braking device even when the device is reduced in diameter to further heighten a ground clearance. SOLUTION: A wet braking device 43 comprises a plurality of rotatable friction brake disks 48 coupled to the input shaft 24 of a reduction gear 23 connected to a propeller shaft 21 for their axial free slide and against their relative rotation, a plurality of stationary friction brake disks 47 alternated with the rotatable friction brake disks 48, an unrotative brake housing 16 for enclosing both those friction brake disks 48 and 47 so that the stationary friction brake disks 47 are supported for their axial free slide and against their rotation, pressure receiving parts 49 arranged in the housing 16 to support one side of both those friction brake disks 48 and 47, and an actuation means 50 to press the other side of both those friction brake disks 48 and 47 toward the pressure receiving parts 49.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a buggy vehicle used mainly for traveling on rough terrain, in particular, a power unit, a propulsion shaft connected to an output shaft of the power unit and extending in the front-rear direction of the vehicle, A rear axle extending in the left-right direction, a reduction gear for connecting the propulsion shaft and the rear axle to reduce the power transmission from the former to the latter, and a pair of right and left rear wheels with low-pressure tires attached to both ends of the rear axle; The present invention relates to a brake device for braking a rear wheel in a buggy equipped with the vehicle.

[0002]

2. Description of the Related Art In such a buggy vehicle, particularly when traveling on uneven terrain, it is required that the ground height of the brake device be set as large as possible so that a projection on the ground does not interfere with the rear wheel brake device. Is done. Conventionally, in response to such demands,
As disclosed in Japanese Patent Application Laid-Open No. 60-163752, a disk brake device in which a disk rotor is fixed to a propulsion shaft for driving a rear axle at a reduced speed has already been proposed. In such a brake device, since the transmission torque of the propulsion shaft is smaller than that of the axle, the brake torque is also relatively small, so that the diameter of the disk rotor can be reduced accordingly, and the ground clearance of the brake device is set large. There is an advantage that can be.

[0003]

However, even though the diameter of the disk rotor provided on the propulsion shaft can be reduced, the entire brake torque must be borne by a single disk rotor. Have limitations. In addition, the disc brake provided with the disc rotor on the propulsion shaft is located at the rear of the power unit, where it is difficult for the traveling wind to hit, so that it is difficult to say that the cooling by the traveling wind is good. If the disc brake is housed in the brake housing in order to prevent intrusion, etc., the cooling performance is inevitably reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is capable of exerting a sufficient braking force to reliably brake the rear wheels even if the diameter is reduced to further increase the ground clearance. A first object is to provide a brake device for a car, and a second object is to provide a brake device for the buggy vehicle capable of simultaneously performing good cooling.

[0005]

To achieve the above object, the present invention provides a power unit, a propulsion shaft connected to an output shaft of the power unit and extending in the front-rear direction of the vehicle, a rear axle extending in the left-right direction of the vehicle, A speed reduction device that connects a propulsion shaft and the rear axle to reduce the power transmission from the former to the latter, and a buggy vehicle having a pair of left and right rear wheels with low-pressure tires mounted on both ends of the rear axle; A plurality of rotating friction brake plates axially slidably and non-rotatably coupled to a propulsion shaft or a transmission shaft rotating integrally therewith, and a plurality of fixed friction brakes alternately stacked with the rotating friction brake plates The fixed friction brake plates are accommodated in the plate, and the fixed and friction brake plates are slidably supported in the axial direction and non-rotatably supported. A non-rotating brake housing, a pressure receiving portion provided on the brake housing to support one side of the rotating and fixed friction brake plate group, and a second side of the rotating and fixed friction brake plate group connected to the pressure receiving portion. A first feature is that the brake device is constituted by the actuating means that can be pressed.

According to the first feature, the actuation means is operated to press the rotary friction brake plate and the fixed friction brake plate against the pressure receiving portion, whereby the propulsion shaft, the reduction gear, The rear wheel can be braked via the rear axle. At this time, since the brake torque applied to the propulsion shaft is smaller than that applied to the axle as described above, the load on the brake device is relatively small, and the brake torque is applied to the plurality of rotating and fixed friction brakes. Since the plates bear substantially evenly, the load on each friction brake plate is further reduced, and as a result, the diameter of the rotating and fixed friction brake plates and, consequently, the entire brake device is reduced, and the ground clearance is reduced. Can be greatly increased. Therefore, the buggy vehicle can easily travel on uneven terrain without causing the brake device to interfere with a large protrusion on the ground.

[0007] In addition to the above features, the present invention further provides that the brake housing is connected to a reduction case for accommodating the reduction gear, and the reduction case and the brake housing are connected between the reduction case and the reduction gear by the operation of the reduction gear. A second feature is that the lubricating oil stored in the case is communicated with each other so as to circulate.

According to the second feature, the lubricating oil circulates between the reduction case and the brake housing, thereby lubricating and cooling the inside of the brake device, thereby improving the durability and cooling performance of the brake device. .

Further, in addition to the second feature, the present invention stores lubricating oil scattered by rotation of a rotating member of a reduction gear in a lower portion of the reduction case,
An upper oil passage for guiding oil scattered by the rotating member into the brake housing and a lower oil passage for returning oil from the brake housing to the reduction case are provided between the reduction case and the brake housing. This is the third feature.

According to the third feature, the lubrication oil inside the reduction case and the brake housing can be used to lubricate and cool the inside of the brake device more effectively.

Further, the present invention relates to a first, second or third embodiment.
In addition to the above features, the brake housing is constituted by a rear housing half integrally formed at the front end of the reduction case, and a front housing half which is separably bolted to the rear housing half. That fourth
The feature of.

According to the fourth feature, the rear housing half of the brake housing is integrated with the reduction case, so that the number of parts can be reduced and the structure can be simplified. Since the brake housing is supported by the case, a dedicated torque link for connecting the brake housing to the vehicle body is not required to prevent the brake housing from rotating. Further, since the two housing halves can be separated from each other, the separation enables the inspection and maintenance of the brake device to be easily performed, thereby improving the maintainability.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings.

FIG. 1 is a schematic side view of a buggy equipped with a brake device of the present invention, FIG. 2 is a schematic plan view of the buggy, FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, and FIG. 5 is a sectional view taken along line 4-4, FIG. 5 is a sectional view taken along line 5-5 in FIG. 3, and FIG.
7 is a sectional view taken along line 7-7 of FIG.

First, in FIGS. 1 and 2, reference numeral 1 indicates a buggy vehicle. A pair of left and right front wheels 3, 3 and rear wheels 4, 4 are attached to the front and rear of the body frame 2 via a suspension device so as to be able to move up and down. Low-pressure tires are installed. A power unit 7 including an internal combustion engine 5 and a transmission 6 is mounted in the center of the body frame 2, and a fuel tank 8 and a seat 9 are disposed above the power unit 7. 10 are provided. Therefore, this buggy car 1 has the seat 9
And steers with both feet on steps 10 and 10.

The rear suspension 11 for the rear wheels 4 is
The vehicle includes a pair of left and right rear forks 13 and 14 which are connected to the vehicle body frame 2 via a horizontal pivot 12 so as to be able to swing up and down. The left rear fork 13 is a left intermediate portion of a rear axle 15 extending in the left and right direction. The right rear fork 14 supports a right intermediate portion of the rear axle 15 via a brake housing 16 and a reduction case 17 described later. A pair of rear wheels 4, 4 are attached to both ends of the rear axle 15, and the reduction case 1
Between the vehicle body frame 7 and the vehicle body frame 2, a cushion unit 18 for resiliently pushing the reduction case 17 downward is mounted.

Next, a transmission system from the power unit 7 to the rear wheels 4, 4 will be described.

As shown in FIGS. 2 to 4, a propulsion shaft 21 extending in the front-rear direction of the vehicle is connected to an output shaft 20 of the power unit 7 via a universal joint 22. The propulsion shaft 21 is connected to the reduction shaft. It is connected to the rear axle 15 via a reduction gear 23 accommodated in the case 17. At this time, the bending point of the universal joint 22 is arranged on the axis of the pivot 12, so that the transmission between the output shaft 20 and the propulsion shaft 21 is performed regardless of the vertical swing of the left and right rear forks 13, 14. Has become.

The speed reducer 23 has an input shaft 24 which slidably fits a front spline shaft portion 24a into a spline hole 21a at a rear end portion of the propulsion shaft 21, and is formed integrally with a rear end of the input shaft 24. And a large-diameter driven bevel gear 26 meshed with the driving bevel gear 25 and spline-coupled to the rear axle 15. The driving bevel gear 25 is inserted into a spline hole 21 a of the propulsion shaft 21. A spring 27 that urges the driven bevel gear 26 in the meshing direction with the driven bevel gear 26 is contracted.

The reduction case 17 has a cylindrical case body 17a having an oil reservoir 28 at a lower part, an end wall member 17b bolted to an open left end face of the case body 17a, and a right end of the case body 17a. And a bearing cap 17c bolted to the wall, and is mounted on the end wall member 17b.
As a result, the boss 26a of the driven bevel gear 26 is supported, and the boss 26a is also supported by the rear axle 15 via the bush 30. Therefore, the end wall member 17b supports the rear axle 15 via the boss portion 26a of the driven bevel gear 26. Further, the rear axle 15 is also supported by a ball bearing 31 mounted on the case body 17a and the bearing cap 17c.

A bearing bracket 33 for supporting the inner end of the input shaft 24 via a needle bearing 32 and a bearing boss 35 for supporting an intermediate portion of the input shaft 24 via a ball bearing 34 are provided on the case body 17a. A large number of cooling fins 36 are integrally formed on the outer peripheral surface of the case body 17a.

An oil seal 37 that is in close contact with the outer peripheral surface of the rear axle 15 is mounted on the end wall member 17b. A bearing retainer cylinder 38 for holding the inner race of the bearing 31 is fixed to the rear axle 15, and an oil seal 39 that is in close contact with the outer peripheral surface thereof is mounted on the bearing cap 17c, whereby the reduction case 17 is liquid-tight. You.

The lubricating oil 19 is injected into the oil reservoir 28 from a filler port (not shown) to a prescribed level at which the lower part of the driven bevel gear 26 is immersed. A drain bolt 41 is screwed into the drain hole 40 opened at the bottom of the oil reservoir 28 to close it. A permanent magnet 42 is provided in an accommodation recess 41 a formed at the inner end of the drain bolt 41.
Lubricating oil 19 stored in the oil sump 28
It absorbs iron powder and the like inside.

A brake housing 16 is integrally connected to a front end of the reduction case 17, and a brake device 43 of the present invention for the rear wheels 4 is accommodated therein. Next, the brake device 43 will be described.

As shown in FIGS. 3 to 5, the brake housing 16 includes a housing lid 16b integrally formed in a flange shape at the front end of the bearing boss 35, that is, a rear housing half, and the housing lid 16b. bearing cylindrical housing body 16a that is detachably coupled to the open end face by a bolt 46 _1, i.e., is composed of a front housing halves, the front end wall of the housing body 16a, the rear end of the propeller shaft 21 to Ball bearing 44 and an oil seal 45 that is in close contact with the outer peripheral surface of the propulsion shaft 21 are mounted. The front end of the further housing body 16a, the rear end of the propeller shaft 21 the right rear fork 14 configured to a tubular to cover the are attached by bolts 46 _2.

The brake device 43 includes a plurality of rotary friction brake plates 48, 48... Slidably and non-rotatably coupled to the spline shaft portion 24a of the input shaft 24, and the rotary friction brake plates 48, 48. And a plurality of fixed friction brake plates 47, 47... Which are alternately overlapped with each other and slidably and non-rotatably splined and supported on the inner peripheral surface of the housing body 16a, An annular pressure receiving portion 49 formed on the inner surface of the housing lid 16b to receive the fixed friction brake plate 47 located at the rearmost position of the group 47, and the rotary friction brake plate 48 and the fixed friction against the pressure receiving portion 49. Operating means 50 capable of pressing the fixed friction brake plate 47 located at the forefront of the brake plate 47; As described above, the fact that the spline shaft portion 24a of the input shaft 24 is used not only for connection with the propulsion shaft 21 but also for connection with the rotary friction brake plate 48 is effective in simplifying the structure. It is.

The operating means 50 includes an annular rotary cam plate 5 disposed adjacent to the foremost fixed friction brake plate 47.
1, an annular fixed cam plate 52 opposed to the rotating cam plate 51, and a ball 53 formed on the opposing surface of the two cam plates 51, 52 and engaging with a pair of cam grooves 51 a, 52 a. The fixed cam plate 52 is provided on the inner wall of the housing body 16a so as to be concentric with the input shaft 24.
4 and is fixed to the housing body 16a by pins 55, and the rotary cam plate 51 is rotatably fitted to the cylindrical shaft 54.

As shown in FIGS. 5 and 7, a plurality of pairs of the cam grooves 51a, 52a are provided on the opposing surfaces of the cam plates 51, 52 at equal intervals in the circumferential direction. Each pair of cam grooves 51a, 52a extends in the circumferential direction of each of the cam plates 51, 52, and is formed such that the bottom of each groove becomes shallower toward ends opposite to each other. Usually, the two cam grooves 51a and 52a have their deepest portions opposed to each other and sandwich the ball 53 therebetween.
Are placed in close proximity, but the rotating cam plate 51 is
When the ball 53 is rotated in the direction A in which the shallow sides of the ball 1a and 52a are opposed to each other, a thrust is generated in the ball 53 to separate the rotary cam plate 51 from the fixed cam plate 52, that is, the rotating and fixed friction brake plates 48 and 47. It is designed to be pressed toward the group.

As shown in FIGS. 4 to 6, the rotary cam plate 51 has a radially outward driven arm 56 on its outer peripheral surface.
An operating shaft 58 having a corresponding drive arm 57 is supported by the housing body 16a and the housing lid 16b. One end of the operating shaft 58 penetrates an oil seal 59 mounted on the housing body 16a and protrudes out of the housing body 16a. An operating lever 60 is serrated and connected to one end of the operating shaft 58.
The operating lever 60 is provided with first and second connection slots 61 and 62 extending in the rotation direction.
1, a connection terminal 63a of a first brake wire 63 connected to a brake lever (not shown) is provided.
2, a connection terminal 64a of a second brake wire 64 connected to a parking brake lever (not shown) is slidably fitted to the first and second brake wires 63, 6, respectively.
4, the operating lever 60 is rotated, and the driven arm 56, that is, the rotating cam plate 5 is rotated by the driving arm 57.
1 can be rotated in the A direction. At that time, one of the brake wires 63 or 64 at rest
Is operated by sliding the connection terminal 63a or 64a into the corresponding connection slot 61 or 62.
Does not hinder the rotation of The housing body 16a is provided with a stopper 65 for defining a non-operating position of the operating lever 60, and a return spring 66 for urging the operating lever 60 toward the stopper 65 is connected to the operating lever 60.

As shown in FIGS. 4 and 5, some spline teeth 47a of the fixed friction brake plates 47, 47 located on both front and rear outer sides of the group of rotating and fixed friction brake plates 48, 47 are provided with both ends. A guide pin 67 having stop enlarged portions 67a, 67b is slidably mounted, and a release spring 68 penetrated by the guide pin 67 is contracted between the spline teeth 47a, 47a.

Referring again to FIGS. 3 and 5, the reduction case 17 and the brake housing 16 are provided with an upper oil passage 70 which communicates the upper portions thereof with each other.
A lower oil passage 71 that communicates the lower portions of the inside with each other is formed. In the case of the illustrated example, a part of the lower oil passage 71 is formed by a spline groove 72 in the lower portion of the inner peripheral portion of the housing main body 16a with which the spline teeth 47a of the fixed friction brake plate 47 engage. The oil reservoir 28 of the reduction case 17 passes through the lower oil passage 71.
The lubricating oil 19 flows into the brake housing 16 and enters the rotating and fixed friction brake plate 4 in the oil.
The lower part of the 8,47 group is immersed.

A series of guard plates 73 are fixed to the brake housing 16 and the reduction case 17 to cover these lower surfaces and protect them from obstacles on the ground.

Referring again to FIGS. 1 and 3, the reduction case 17 is connected to a breather pipe 74 communicating with the upper space inside the reduction case 17. The outer end of the breather pipe 74 is attached to a high place of the buggy 1, for example, below the fuel tank 8, and is bent downward in a U-shape.

Next, the operation of this embodiment will be described.

During the operation of the power unit 7, its power is
The power is transmitted to the rear axle 15 through the propulsion shaft 21, the input shaft 24, the drive bevel gear 25, and the driven bevel gear 26 in order.
Since the left and right rear wheels 4, 4 are driven, the buggy 1 can be run.

At this time, if the brake device 43 is in a non-operating state, as shown in FIG. 7, a pair of cam grooves 51a,
The rotary cam plate 51 is kept at the retracted position by engaging the ball 53 at the deepest portion of the outermost portion 52a, and the fixed friction brake plates 47 on both front and rear sides are released by the elastic force of the release spring 68.
Are separated from each other, no drag occurs between the fixed friction brake plate 47 and the rotary friction brake plate 48, and the rotation of the input shaft 24 is not hindered.

During traveling, the first brake wire 63 is pulled by operating a brake lever (not shown), and the operating lever 60 is turned. When the drive arm 57 rotates the rotary cam plate 51 via the driven arm 56 in the direction of arrow A, Therefore, each pair of cam grooves 51a and 52a is relatively displaced so that the shallow sides are opposed to each other, and the rotating cam plate 51 cooperates with the pressure receiving portion 49 to rotate by the thrust generated in the ball 53. The input shaft 24 can be braked by the friction brake torque generated between the two friction brake plates 48 and 47 by pinching the fixed friction brake plates 48 and 47 group. , The rear wheels 4, 4 can be braked.

By the way, the input shaft 24 which is good at the speed reducer 23
Of the rear axle 15 below the speed reducer 23, the load on the brake device 43 is relatively small, and the brake torque is applied to a plurality of fixed friction brake plates 47 and rotary friction brake plates 48.
, The friction brake plates 48, 47
Is further reduced, and the diameter of the fixed friction brake plate 47 and the rotary friction brake plate 48, and thus the entire brake device 43, is greatly reduced, and the ground clearance can be greatly increased. Therefore, it is possible to easily travel on uneven terrain without causing the brake device 43 to interfere with a protrusion on the ground.

Since the brake device 43 is housed in the brake housing 16, it is protected from intrusion of earth and sand, muddy water, etc., but frictional heat generated in the fixed friction brake plate 47 and the rotary friction brake plate 48 during braking. Is prevented from diverging by the brake housing 16. However, the heat is cooled as follows.

That is, the rotating and fixed friction brake plates 48,
The lower part of the group 47 is always immersed in the oil sump 28 of the reduction case 17 and the oil 19 filling the bottom of the brake housing 16.
47 is cooled by the oil during rotation.

In addition, while the buggy 1 is running, the speed reducer 2
The large-diameter driven bevel gear 3 scatters oil in the oil reservoir 28 by its rotation in order to lubricate each part of the reduction gear 23. At this time, a part of the scattered oil passes through the upper oil passage 70 and brakes. The oil enters the housing 16 and the oil at the bottom of the brake housing 16 returns to the oil reservoir 28 of the reduction case 17 through the lower oil passage 71. Since the reduction case 17 having a large number of cooling fins 36 on the outer peripheral surface has a large outer surface area and good cooling by the outside air, the oil that has finished cooling the rotating and fixed friction brake plates 48 and 47 group is oil. Reduction case 1 when returning to sump 28
7 is cooled. The oil cooled in this way is scattered again by the rotation of the driven bevel gear 26, and is repeatedly supplied to the brake housing 16, whereby the brake device 43 is effectively cooled.

In this case, in order to promote the flow of oil from the reduction case 17 into the brake housing 16, it is effective to make the upper oil passage 70 have a downwardly sloping slope, and from the brake housing 16 to the oil sump 28. In order to promote the return of the oil, it is effective to provide the lower oil passage 71 with a downward slope.

The upper space in the reduction case 17 is
Because it communicates with the atmosphere through the breather pipe 74,
If there is a pressure change due to a temperature change of the oil 19 or the like in the reduction case 17 and the brake housing 16 communicating with each other, the reduction case 17 and the brake housing 16 can breathe the outside air through the breather pipe 74 in accordance with the pressure change. Therefore, oil leakage due to an increase in the internal pressure of the reduction case 17 and the brake housing 16 can be avoided. Moreover,
Since the outer end of the breather pipe 74 is located at a high place of the buggy 1 and is bent downward, it is possible to prevent dust and rainwater from entering the breather pipe 74 even during traveling.

When iron-based chips or abrasion powder are mixed in the oil circulating in the reduction case 17 and the brake housing 16, the chips or abrasion powder are drained when they reach the oil reservoir 28. It is attracted to the magnet 42 attached to the tip of the drain bolt 41 in the hole 40. Therefore, it is possible to prevent the above-mentioned chips and abrasion powder from recirculating together with the oil and entering the inside of the brake device 43, in particular, between the fixed friction brake plate 47 and the rotary friction brake plate 48 to accelerate the abrasion thereof. This can contribute to improving the durability of the device.

The chips and friction powder adsorbed by the magnet 42 of the drain bolt 41 are removed when the drain bolt 41 is removed in order to discharge dirty oil from the drain hole 40 at the time of oil change in the oil reservoir 28. Removed from 42.

[0046] The housing body brake housing 16, a housing lid 16b which is formed integrally with the front end of the reduction case 17, i.e. in which the rear housing halves are separably connected by a bolt 46 ₁ to the housing lid 16b 16a, that is, the front housing half, the structure of the brake housing 16 can be simplified, and the brake housing 16 is supported by the reduction case 17. A special torque link that connects this to the vehicle body is not required to prevent rotation. The two housing halves 16a by removing the bolts 46 _1, if the separation between 16b, inspection of the brake device 43 can perform maintenance easily, maintenance is good. Particularly, as shown in the illustrated example, when the rotating and fixed friction brake plates 48 and 47 are housed in the housing body 16a separated from the housing lid 16b integrated with the reduction case 17, and the operating means 50 is provided. Since the rotating and fixed friction brake plates 48 and 47 and the operating means 50 can be separated from the reduction case 17 together with the housing body 16a, inspection and maintenance of the main part of the brake device 43 can be performed very easily. It is convenient.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, the brake device 43 can be configured such that the rotary friction brake plates 48, 48,... Are spline-coupled to the propulsion shaft 21, and the operating means 50 of the brake device 43 can be hydraulically configured. . Alternatively, the rear axle 15 may be divided into right and left parts, and they may be connected via a differential device with a differential limiting device.

[0049]

As described above, according to the first aspect of the present invention, a power unit, a propulsion shaft connected to an output shaft of the power unit and extending in the longitudinal direction of the vehicle, a rear axle extending in the lateral direction of the vehicle, A propulsion device for a buggy having a reduction gear for connecting a shaft and the rear axle to reduce the power transmission from the former to the latter, and a pair of right and left rear wheels with low-pressure tires attached to both ends of the rear axle; A plurality of rotating friction brake plates axially slidably and non-rotatably coupled to a shaft or a transmission shaft rotating integrally therewith, and a plurality of fixed friction brake plates alternately stacked with the rotating friction brake plates A non-rotatable housing for accommodating the rotating and fixed friction brake plates and supporting each fixed friction brake plate slidably in the axial direction and non-rotatably. A rake housing, a pressure receiving portion provided on the brake housing and supporting one side surface of the rotating and fixed friction brake plate group, and another side surface of the rotating and fixed friction brake plate group can be pressed against the pressure receiving portion. Since the braking device is constituted by the operating means, the braking torque applied to the propulsion shaft during braking is smaller than that applied to the axle, and the plurality of rotating and fixed friction brake plates bear the braking torque almost equally. As a result, the load on each friction brake plate is further reduced, the diameter of the rotating and fixed friction brake plates, and thus the entire brake device, is reduced, and the ground clearance can be greatly increased. Therefore, the buggy can easily travel on uneven terrain without causing the brake device to interfere with a large protrusion on the ground.

According to a second feature of the present invention, the brake housing is connected to a reduction case accommodating the speed reduction device, and the reduction case and the brake housing are connected therebetween by the operation of the speed reduction device. Since the lubricating oil stored in the reduction case is circulated so as to circulate, the lubricating oil circulates between the reduction case and the brake housing, thereby lubricating and cooling the inside of the brake device and ensuring the durability of the brake device. Performance and cooling performance can be improved.

According to a third feature of the present invention, lubricating oil scattered by rotation of a rotation member of a reduction gear is stored in a lower portion of the reduction case, and a lubricating oil is provided between the reduction case and the brake housing. An upper oil passage for guiding the oil scattered by the rotating member into the brake housing and a lower oil passage for returning the oil from the brake housing to the reduction case are provided, so that the lubricating oil in the reduction case and the brake housing is used. Lubrication and cooling inside the brake device can be performed more effectively.

According to a fourth feature of the present invention,
The brake housing is composed of a rear housing half integrally formed at the front end of the reduction case and a front housing half detachably bolted to the rear housing half. By integrating the housing half and the reduction case, the number of parts can be reduced and the configuration can be simplified, and the brake housing is supported by the reduction case. Therefore, a dedicated torque link for connecting this to the vehicle body is not required. Further, since the two housing halves can be separated from each other, the separation enables the inspection and maintenance of the brake device to be easily performed, thereby improving the maintainability.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a buggy vehicle provided with a brake device of the present invention.

FIG. 2 is a schematic plan view of the buggy vehicle.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

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

FIG. 5 is a sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 3;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 5;

[Explanation of symbols]

 4 ··· Rear wheel 7 ··· Power unit 15 ··· Rear axle 16 ··· Brake housing 16a · · · Front housing half (housing body) 16b · · · Rear housing half ( Housing lid) 17 Reduction case 19 Lubricating oil 20 Output shaft 21 Propulsion shaft 23 Reducer 24 Transmission shaft (input shaft) 26 ··· Rotating member (driven bevel gear) 43 ··· Brake device 47 ··· Fixed friction brake plate 48 ··· Rotation friction brake plate 49 ··· Pressure receiving part 50 ··· Activating device 70 ··· Upper oil passage 71 ··· Lower oil passage

Claims (4)

[Claims] 1. A power unit (7), a propulsion shaft (21) connected to an output shaft (20) of the power unit (7) and extending in the longitudinal direction of the vehicle, a rear axle (15) extending in the lateral direction of the vehicle, and the propulsion. A speed reducer (23) for connecting the shaft (21) and the rear axle (15) to reduce the power transmission from the former to the latter, and a pair of left and right, low-pressure tires attached to both ends of the rear axle (15) In the buggy equipped with the attached rear wheel (4), the propulsion shaft (21) or the transmission shaft (2) rotating integrally therewith.
4) A plurality of rotary friction brake plates (48) slidably coupled in the axial direction and non-rotatable, and a plurality of fixed friction brake plates (47) alternately superimposed on these rotary friction brake plates (48). ) And a non-rotating brake housing (16) that accommodates the rotating and fixed friction brake plates (48, 47) and supports each fixed friction brake plate (47) slidably in the axial direction and non-rotatably. A pressure receiving portion (49) provided on the brake housing (16) for supporting one side surface of the group of rotating and fixed friction brake plates (48, 47); and a portion of the rotating and fixed friction brake plates (48, 47). An actuating means (50) capable of pressing the other side of the group against said pressure receiving part (49). 2. The device according to claim 1, wherein said brake housing is connected to a reduction case housing said reduction gear, said reduction case and said brake housing. 1
6), during which, by the operation of the speed reducer (23),
A brake device for a buggy vehicle, characterized in that a lubricating oil (19) stored in a reduction case (17) is communicated with each other so as to circulate. 3. The device according to claim 2, wherein lubricating oil (19) scattered by rotation of a rotating member (26) of a reduction gear (23) is stored in a lower portion of said reduction case (17). An upper oil passageway (70) for guiding the oil scattered by the rotating member into the brake housing (16) between the reduction case (17) and the brake housing (16); A brake device for a buggy, wherein a lower oil passage (71) for returning oil to the reduction case (17) is provided. 4. The rear housing half (16b) according to claim 1, wherein the brake housing (16) is formed integrally with a front end of the reduction case (17). And a front housing half (16a) detachably bolted to the rear housing half (16b).