JPS60255592A - Brake gear for car with rear two-wheel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tricycle or a four-wheeled motor vehicle in which engine power is transmitted to two left and right rear wheels via a drive shaft extending in the longitudinal direction of the vehicle body. The present invention relates to a vehicle such as a vehicle, and particularly to a brake device for braking rear wheels.

[Technical background of the invention and its problems]

Conventionally, in this type of vehicle for traveling on rough terrain, the braked member of the rear wheel brake, such as the 'disc rotor, has been generally installed on the rear axle that supports the two left and right rear wheels. Recently, the applicant of the present invention has attempted to provide a drive shaft for transmitting engine power to the rear axle, and has already filed a patent application as Japanese Patent Application No. 59-18416.

However, when a braked member is provided on the drive shaft as shown in the above-mentioned prior art, the projected area from the front and back becomes larger than when it is provided on the rear axle, so obstacles on the road surface or the front wheels are The brakes are more likely to be hit by mud or pebbles, leaving room for improvement in terms of brake protection.

At the same time, in this type of vehicle, various functional parts such as an air cleaner, accessory case, and fuel tank are housed in the space between the left and right rear wheels, so it is necessary to provide a braked member on the drive shaft as described above. , the entire brake fits between the rear wheels, resulting in problems such as a reduction in space for arranging various functional parts.

[Purpose of the invention]

The present invention was made based on these circumstances,
To provide a brake device for a vehicle having two rear wheels, which can more reliably protect the brakes and secure a sufficient accommodation space between the rear wheels.

[Summary of the invention]

That is, in order to achieve the above-mentioned object, the present invention deviates the drive shaft of the rear axle toward the side in the width direction of the vehicle body, and arranges it so that it is inclined upward as it moves toward the front engine side. A brake member for a rear wheel brake is provided at the front of the vehicle.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, 1 is a frame that constitutes a vehicle body, and a front axle 4 is supported by a support pipe 3 located at the front end of a main pipe 2 of the frame. At both ends of the front axle 4 are left and right front wheels 5,5.
is supported so that it can be steered, and left and right underpipes 6, 6 are led out rearward from this front axle 4, and the rear ends of these underpipes 6, 6 are raised up so that the main It is connected to the rear ends of left and right seat rails 7.7 extending rearward from the pipe 2. Further, the rear end of the main pipe 2 and the rear portions of the underpipes 6, 6 are connected by a connecting vibe 2a extending in the vertical direction.

Between the main pipe 2 and the underpipe 6, 6,
An engine 8 is mounted, and a fuel tank 9 and a seat 10 are installed in the front and rear above the engine 8, and footrests 12, 12 are installed on both left and right sides of a crankcase 11 of the engine 8. ing.

On the other hand, the rising edge 811 of the rear end of the amplifier pipes 6, 6
A support case 13 is removably fixed between 6a and 6a via a bolt 6b, and a differential case 14 is attached to an opening on one side of the support case 13. Inside these cases 13 and 14 are left and right rear wheels 15.
Rear axles 16a, 16b supporting the rear wheels 15a, 15b are rotatably supported.
In the space 17 surrounded by the seat '10 and the air cleaner 20, there are various functional parts, that is, in this embodiment, an air cleaner 20 connected to the cylinder 18 of the engine 8 via a carburetor 19, and a box-shaped accessory case. 21 are arranged at the front and rear. In addition, the front wheels 5, 5 and the rear wheel 15a
, 15b are both equipped with ultra-low pressure wide balloon tires.

The differential case 14 is located outside one underpipe 6, and the differential case 14 and the crankcase 1
A drive shaft 23 for transmitting engine power to the rear axles 16a and 16b is installed between the vehicle and a case cover 22 attached to one side of the vehicle. The drive shaft 23 of this embodiment connects the front shaft 24a and the rear shaft 24b to the universal joint 1.
The front end of the front shaft 24a is connected to the output shaft 26 of the engine power inside the case cover 22 with a bevel gear 27, 28 and an msm mechanism 2 for overload prevention.
9, and the rear end of the rear shaft 24b is housed in the differential case 14. A differential gear with a slip prevention mechanism, a so-called non-slip differential 30
via the rear axle 16a.

16b. Such a drive shaft 23 extends in the front-rear direction at a position offset to the side in the width direction from the center line 0l-Os of the vehicle body, that is, on the outside of one underpipe 6, and extends toward the front engine 8. It is sloped upward as it advances to the side, and stops in front of the road surface A.

The above-mentioned non-slip differential 30 (also referred to as limited slip differential) has the same structure as that shown in Japanese Patent Application No. 57-121945 or Japanese Patent Application No. 59-18416, which has already been filed by the applicant. Although a detailed description thereof will be omitted, the non-slip differential 30 is configured such that in a straight running state where the left and right rear wheels 15a, 15b rotate at the same speed, both the rear wheels 15a, 15b rotate at a constant speed.
15b, and when turning, the driving force is transmitted to the inner rear wheel 15a (15b) in the turning direction.
The outer rear wheel 15b (15a) is made to idle. Further, when a braking force is applied to the drive shaft 23, the braking force is transmitted to both rear wheels 15a and 15b when driving straight, and when the driving shaft is turning, the braking force is transmitted to the outer rear wheels 15 when driving in a corner.
b (15a), and transmits braking force to the inner rear wheel 15a.
(15b) is made to spin idly.

By the way, a mechanical disc brake 31 for braking the rear wheels is provided on the front shaft 24a, which is the front end of the drive shaft 23. That is, the reference numeral 32 is a braked member to which a braking force is applied, that is, in this embodiment, a disk-shaped disc rotor, and this disc rotor 32 has a boss portion 33 engaged in spline engagement with the front shaft 24a. As a result, it is fixed so that it can slide only in the axial direction. The disc rotor 32 is located immediately behind the case cover 22, and in this embodiment, the periphery of the disc rotor 32 is covered with a cover 34. The cover 34 is divided into two parts: a front cover 35a that is integrated with the case cover 22, and a rear cover 35b that covers the rear opening of the front cover 35a. It covers the periphery of 24a. Further, a protective case 36 that covers the rear shaft 24b is fixed to the front end opening of the differential case 14, and this protective case 36
A rubber boot 37 that covers the periphery of the universal joint 25 is placed between the front end opening of the rear cover 35b and the rear opening of the rear cover 35b, and is removably tightened by a hand 38. has been done. As is clear from FIG. 2, the cover 34 is moved in the longitudinal direction of the vehicle body with respect to the rising portion 6a of the connecting pipe 2a and the underpipe 6 that constitute the frame 1 as the drive shaft 23 shifts. The positional relationship is such that they overlap.

Circular guide holes 39 and 39 are formed opposite to each other in the upper portions of the front and rear surfaces of the cover 34, and a pair of pads for sandwiching one string portion of the disc rotor 32 is inserted into these guide holes 39 and 39. 40a and 40b are accommodated. The guide hole 39 on the front side of the disc rotor 32 is closed by a cap 41 that holds the pad 40a, and the guide hole 39 on the rear side is closed by the support member 4.
2, and a slide tube 43 is screwed into this support member 42 so as to be movable forward and backward.

The front end of the slide tube 43 is in contact with the pad 40b via a back plate 44, and a brake lever 45 is fixed to the rear end, and this brake lever 45 is connected via a brake wire 46. Footrest 1
2 is connected to a nearby brake pedal 47. Therefore, when the brake pedal 47 is depressed, the slide tube 43 is rotated in the screwing direction and moved forward as shown by the arrow in FIG. rotor 3
2 moves in the axial direction and is also pressed against the pad 40a on the opposite side, so that it is pinched between the pads 40a and 40b.

A piston 48 for adjusting the gap between the disc rotor 32 and the pads 40a, 40b is housed in the front end of the slide cylinder 43. After loosening the lock nut 49, the piston 48 is adjusted by the screwing amount of the adjustment bolt 50. Slide back and forth by increasing/decreasing pad 4.
0b is pressed.

According to this configuration, the drive shaft 23 is tilted upward as the engine 8 moves forward, and the disc rotor 32 is provided at the front rising end of the drive shaft 23, so that the road surface A
The position of the entire disc brake 31 is raised relative to the
Therefore, obstacles on the road surface and mud, pebbles, etc. thrown up by the front wheels 5, 5 are less likely to hit the vehicle while the vehicle is running, and the disc brake 31 can be more reliably protected.

Further, as described above, the disc brake 31 is connected to the drive shaft 23.
In addition to being located at the front of the rear wheel 15a, the drive shaft 23 itself is disposed biased toward the side in the width direction of the vehicle body, so the cover 34 that holds the disc rotor 32 and pads 40a, 40b is located at the front of the rear wheel 15a. , 15b space 17
Therefore, the rear wheel 15a
, 15b, sufficient space can be secured for arranging various functional parts such as the air cleaner 20 and the accessory case 22.

Further, in this embodiment, the drive shaft 23 is connected to the front shaft 24a and the rear shaft 24a.
4b and 4b, and a disc brake 31 is provided on the front axle 24a connected to the engine 8 side. Therefore, when performing maintenance and inspection of the non-slip differential 30 and the rear axles 16a and 16b, the protective cover 36 and rubber boots 37 are attached. At the same time, if the connection between the rear shaft 24b and the universal joint 25 is released, and in this state, the bolt 6b is loosened to separate the support case 13 from the frame 1 side.
The rear axles 1ea and 1ab can be pulled out rearward together with the non-slip differential 30 and the rear axle 24b.

That is, since the disc brake 31 and cover 34 remain on the engine 8 side, they remain on the rear axle 16a.

Even if the disc brake 16b is pulled out rearward, the disc brake 31 will not get caught on the rising portion 6a of the frame 1 or the connecting pipe 2a, and therefore, it can be easily attached to and detached from the frame 1, improving maintainability.

Although the rear axle is rigidly fixed to the frame in the first embodiment described above, the present invention is not limited to this, and a second embodiment of the present invention is shown in FIGS. 5 and 6. . That is, in this second embodiment, the underpipe 6
, 6 are started up immediately after the engine 8, and a back vibro 0°60 is installed between the undervib 6°6 and the seat rail 1.7, and these underpipes 6.
A rear arm 62 extending rearward is pivotally supported between brackets 61 and 61 provided at the joint between the rear arm 6 and the back vibro 0.60. The rear arm 62 consists of left and right rear forks 63.64 and a cross tube 65 that connects the front ends of these rear forks 3.64, and a differential case 14 and a support case 13 are fixed to the rear ends of each rear fork 3.64. There is. One rear fork 63 located toward one side of the vehicle body has a hollow cylindrical shape, through which the drive shaft 23 is inserted, and between this rear fork 3 and the case cover 22 there is a disc. A brake 31 is provided. . Also,
Between the support case 13 and the rear end of the main pipe 2,
A single hydraulic shock absorber 66 is installed to suspend the rear arm 62, and this hydraulic shock absorber 66 is connected to the rear wheels isa, i.
It is inserted through the space 17 between sb in a forward-inclined posture.

According to the second embodiment having such a configuration, since the disc brake 32 does not protrude into the space 17, it is possible to secure a space for installing the hydraulic shock absorber 66 in this space 17, and the rear arm 62 can be installed in the space 17. Using the rear axle 16a
, 16b are pivotably supported.

In carrying out the present invention, the heat dissipation of the disc brake may be improved by providing ventilation holes in the cover or directly exposing the disc rotor to the outside.

Furthermore, the brake device according to the present invention is not limited to mechanical disc brakes, but can be similarly applied to hydraulic disc brakes and drum brakes, and in the case of a drum brake, the brake drum corresponds to the braked member. .

〔Effect of the invention〕

According to the present invention described in detail above, the drive shaft is tilted upward as it moves forward toward the engine, and the brake member is provided at the front of the drive shaft, so the position of the brake relative to the road surface is raised. Therefore, obstacles on the road surface and mud and pebbles thrown up by the front wheels are less likely to hit the vehicle while the vehicle is running, making it possible to protect the brakes even more reliably.

Furthermore, in addition to the fact that the braked member is located at the front of the drive shaft as described above, the drive shaft itself is disposed biased toward the side in the width direction of the vehicle body, so the brake is placed in the space between the rear wheels. There is no large overhang in the rear wheels, and therefore there is an advantage that sufficient space can be secured between the rear wheels for arranging various functional parts such as an air cleaner, accessory case, or hydraulic shock absorber.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the present invention.
The figure is a side view of a four-wheeled motor vehicle, and the second figure is a plan view of the same.
3 is a view in the direction of the arrow in FIG. 1, FIG. 4 is a sectional view of the power transmission line, FIGS. The figure is a side view of the four-wheeled motor vehicle, and FIG. 6 is a plan view thereof. 1... Vehicle body (frame), 5... Front wheel, 8... Engine, 15a, 15b-... Rear wheel, 16a,
16b--Rear axle, 20°21, 66--Various functional parts (air cleaner, accessory case, hydraulic shock absorber), 23--Drive shaft, 31--Brake (disc brake), 32-- Braked member (disc rotor). Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Scope of Claims] An engine is disposed between the front wheels and the two left and right rear wheels, and the power of the engine is transmitted to the rear axle of the rear wheels via a drive shaft extending in the longitudinal direction of the vehicle body. In a vehicle in which a braked member for a rear wheel brake is provided on the shaft and various functional parts are arranged between the rear wheels, the drive shaft is deviated toward the side in the width direction of the vehicle body, and 1. A brake device for a vehicle having two rear wheels, characterized in that the brake member is arranged to be inclined upward toward the front engine side, and a brake member of the brake is provided at the front of the drive shaft.