JPH11170989A - Braking device for buggy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure and reduce a manufacturing cost by engaging bevel gears of a large gear supported by a shell part and a small gear supported by a cylindrical part, overlapping a rotation frictional plate fixed slidingly axially to an input shaft and a stop frictional plate fixed slidingly axially to the cylindrical part. SOLUTION: A reduction gear case 23 has a shell part 23a formed around a driving axle 21 and a cylindrical part 23b projecting from the shell part 23a forward, the shell part 23a supports a large gear 24, and the cylindrical part 23b supports a small gear 25. Multiple polygonal splines are respectively formed on the inner surface of a front surface cover 23c axially and on the outer surface of the outer end of an input shaft 21, a stop frictional plate 26a and a rotation frictional plate 26b are respectively spline-engaged with the former and the latter movably only in the axial direction. The both frictional plates 26a, 26b are grabbed between the end surface of the cylindrical part 23b and a pressing cam 27, which entirely constitute a multi-plate type frictional brake 26. Thus, the structure can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device mainly used for a vehicle for traveling on rough terrain, and more particularly to a brake device provided with a friction brake on a drive shaft connecting a power unit and a drive axle.

[0002]

2. Description of the Related Art Conventionally, in an automobile or a four-wheel buggy for traveling on uneven terrain, a final reduction gear is provided with an axle connected to drive wheels arranged on the left and right sides of the vehicle body and a propulsion shaft extending rearward from an engine in front. Is known. Also,
An electromagnetic brake on the propeller shaft for the purpose of avoiding the brake fade phenomenon when descending on a heavy truck,
A technique of providing a so-called retarder is known. On the other hand,
A so-called buggy car is known as a small vehicle mainly for traveling on uneven terrain. In a buggy vehicle, the large-diameter brake provided on the axle could make the vehicle unstable when traveling on uneven terrain, so the applicant first applied multi-plate friction to the drive shaft corresponding to the propeller shaft of a large vehicle. The one with a brake was proposed (Japanese Patent Application No. Hei 9-137561).

[0003]

However, a retarder used in a large vehicle rotates an electromagnet to absorb the energy of a propeller shaft and functions substantially as a generator. In addition to being too heavy, such as a coil wound with a wire, it is not suitable as a braking device for a vehicle because it is originally intended to decelerate the vehicle and not to stop the vehicle. As described above, the applicant has proposed and tested a drive shaft provided with a friction brake. As a result, when the differential gear mechanism is disposed between the left and right wheels, there is a problem that the braking force cannot be applied evenly to the left and right wheels in the rough terrain. In addition, if lubrication oil for gears stored in the body of the speed reducer case is to be used for lubrication of the friction brake, it is necessary to provide an oil supply path to the friction brake at a position away from the body. And a pump must be installed, and the structure becomes complicated, which raises production costs.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a speed reducer case which rotatably supports an input shaft extending in the front-rear direction and an axle extending in the left-right direction. A torso formed and a tubular portion protruding forward from the torso are provided, and a bevel gear of a large gear supported by the torso and a small gear supported by the tubular portion meshes with the input shaft. This problem is solved by forming a multi-plate type friction brake by arranging a rotating friction plate locked slidably in the axial direction and a stopping friction plate locked slidably in the axial direction on the cylindrical portion. . Further, an oil supply path extending in a tangential direction from a body portion outside the large gear and extending to an upper portion of the multi-plate friction brake provided in the cylindrical portion is formed, and the multi-plate friction brake is made wet. In this case, it is preferable to form a return oil passage in the speed reducer case from below the multi-plate friction brake to the bottom of the body. In addition, the right and left drive wheels are directly connected by a drive axle, and a large gear connected to the drive axle,
A transmission is meshed with a small gear provided on an input shaft extending rearward from a front power unit, and a friction brake is attached to the input shaft.

[0005]

The friction plate constituting the multi-plate type friction brake is supported by utilizing an existing small gear existing as a reduction gear and a reduction gear case. Further, the multi-plate type friction brake is provided on a shaft that rotates at a high speed as compared with the drive axle, and the torque to be transmitted is small, so that the outer shape of the friction plate is small. The multi-plate type friction brake is provided at the outer end of the cylindrical portion of the speed reducer case, and is provided away from the meshing position between the small gear and the large gear. Ride through the refueling path and swing from above the multi-plate friction brake. As a result, the multi-plate type friction brake is lubricated by the lubricating oil and operates with the friction plate wet. The lubricating oil sent to the multi-plate friction brake located in front of the gear type speed reducer returns to the vicinity of the gear type speed reducer via the lower oil passage. The input shaft and the left and right wheels are integrally connected to each other via a reduction gear and a drive axle, and when the input shaft is braked, the left and right wheels stop simultaneously.

[0006]

An embodiment of the present invention will be described. 1 and 2
Among them, 10 is a buggy vehicle utilizing the present invention. The buggy 10 has left and right front wheels 11, 11 fitted with balloon tires.
Frame 1 made of steel pipe and supported by rear wheels 12 and 12
And 3. The body frame 13 is provided with a bar-shaped steering handle 14 connected to the front wheels 11, a fuel tank 15, an occupant seat 16, and the like. Reference numeral 17 denotes a power unit in which the engine and the transmission are integrally formed, and a footrest bar 13a is attached to a lower surface thereof. 19
Is a swing arm that supports the rear wheel 12 at the rear end,
Its front end is rotatably supported by the vehicle body frame 13. Reference numeral 18 denotes a cushion spring.

The swing arm 19 is made of a steel pipe.
Gear reducer 20 supporting rear wheels 12, 12 at the rear end
Is attached. As shown in FIGS. 3 and 4, the gear reducer 20 supports a drive axle 21 extending in the left-right direction and an input shaft 22 arranged in the front-rear direction on a reducer case 23. A large gear 24 made of a bevel gear is fixed to the drive axle 21, and a small gear 25 is fixed to the input shaft 22.
They are meshed with each other to change the rotation direction of the input shaft 22 to 9
It is converted to 0 ° and transmitted to the drive axle 21 after deceleration. Thus, the input shaft 22 and the left and right rear wheels 12, 12 always rotate at a constant speed ratio. Reference numeral 28 denotes a propulsion shaft spline-coupled to the front end of the input shaft 22. The front end of the propulsion shaft 28 is connected to the power unit 17 via a universal joint 29. The bent portion of the universal joint 29 is disposed on the axis of a pivot for pivotally supporting the swing arm 19 to the vehicle body frame 13.

The reduction gear case 23 has a body 23a formed around the drive axle 21 by casting a light alloy, and a tubular part 23b projecting forward from the body 23a. The gear 23 is supported by the cylindrical portion 23.
The small gear 25 is supported by b. 23c is the cylindrical portion 23b
Is a front cover that closes an open end of the vehicle, and is bolted to the open end. 23d is a side cover that closes the open end of the body 23a. In this embodiment, the speed reducer case 23 is supported by the vehicle body frame 13 at a position where the front side of the cylindrical portion 23b is directed upward by 2 to 3 degrees with respect to the horizontal line.

A large number of square splines formed in the axial direction are formed on the inner surface of the front cover 23c. On the other hand, similar splines are formed on the outer surface of the outer end of the input shaft 21. The plate 26a is spline-engaged with the latter in such a way that the rotary friction plate 26b is movable only in the axial direction. One side of the friction plates 26a and 26b is supported by the end face of the cylindrical portion 23b, and the other side is in contact with the pressing cam 27. That is, the two friction plates 26a and 26b are sandwiched between the end surface of the tubular portion 23b and the pressing cam 27, and the multi-plate type friction brake 26 is configured as a whole. As shown in FIG. 4, the pressing cam 27 has a fixed cam plate 27a fixed to the front cover 23c by a knock pin 27c and a movable cam plate 2 rotatably supported by a lever 27d.
7b. As shown in FIGS. 5 and 6, the lever 27d is connected to an external operation arm 27e via a support shaft, and is connected to a brake pedal and a brake lever (not shown) via an operation wire 27f. Therefore, the movable cam plate 2 is moved by the lever 27d.
By rotating 7b, the movable cam plate 27b advances and retreats toward the friction plates 26a and 26b, and brakes or releases.

An oil supply passage 31 is formed in the reduction gear case 23 outside the large gear 24 and extends tangentially through the outside of the cylindrical portion 23b. A return oil passage 32 is formed. Refueling channel 3
1 and the reflux oil passage 32 are connected to the front cover 2 from the reduction gear case 23.
3c. The other end of the oil supply passage 31 is bent downward inside the front cover 23c and opens above a pressing cam 27 constituting a friction brake 26. Therefore, when the large gear 24 rotates, the airflow rotating with the rotation of the large gear 24 and the splash of the lubricating oil form the oil supply path 3.
1 and falls on the friction brake 26 to lubricate the pressing cam 27 and the friction plates 26a and 26b. After lubricating the friction brake 26, the lubricating oil drops downward and flows into the return oil passage 32, through which it returns to the body 23a. In this embodiment, the lubricating oil is recirculated to the return oil passage 32 by gravity.
The reduction gear case 23 is suspended so that the front side of the cylindrical portion 23b is slightly upward so as to be able to recirculate inside.
Needless to say, it is only necessary to incline only the bottom portion. Thus, the oil supply passage 31 and the recirculation oil passage 32 are formed at the same time when the reduction gear case 23 and the front cover 23c are cast, so that the number of parts does not need to be increased. Further, since the lubricating oil is fed from inside the body portion 23a using the rotation of the large gear 24, there is no need to provide a dedicated oil tank or oil pump for the friction brake, and the structure can be simplified.

[0011]

According to the first aspect of the present invention, a small and compact multi-disc type friction brake can be obtained by utilizing the reduction gear case. Further, since the friction plate requires only a small diameter, if the height of the axle is the same as that of the conventional product, the minimum ground clearance can be kept high. According to the invention of claim 2, oil is supplied by using the oil supply path formed in the reduction gear case and by utilizing the rotation of the reduction gear in the reduction gear case. Therefore, no additional oil supply pump or piping is required, and the structure is reduced. Simple and easy to assemble and maintain. According to the third aspect of the invention, the lubricating oil supplied to the friction brake is returned to the body by gravity through the return oil passage. According to the invention of claim 4, by integrally connecting the left and right drive wheels by the drive axle, both wheels can be simultaneously braked only by providing a friction brake on the input shaft. And so on.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a buggy vehicle showing one embodiment of the present invention.

FIG. 2 is a schematic plan view of FIG. 1 showing a power transmission system.

FIG. 3 is an enlarged sectional view showing a III-III section in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 3;

FIG. 6 is a view taken in the direction of arrow VI in FIG. 3;

[Explanation of symbols]

10 ··· Buggy car 11 · · · front wheel 12 · · · rear wheel 13 · · · body frame 14 · · · steering wheel 15 · · · fuel tank 16 · · · seat 17 · ··· Power unit 18 ··· Cushion spring 19 ··· Swing arm 20 ··· Gear reducer 21 ··· Drive axle 22 ··· Input shaft 23 ··· Reducer case 23a ··· Body 23b ··· Cylindrical part 23c · · · Front cover 23d · · · Side cover 24 · · · Large gear 25 · · · Small gear 26 · · · Multi-plate friction brake 26a · ··· Stopping friction plate 26b ··· Rotating friction plate 27 ··· Pressing cam 27a ··· fixed cam plate 27b ··· movable cam plate 27c ··· knock pin 27d ··· lever 27e ··· brake arm 27f ... Operation wire 28 ... Propeller shaft 29 ... universal joint 31 ... oil supply passage 32 .... reflux oil passage

Claims (4)

[Claims] An input shaft extending in the front-rear direction and an axle extending in the left-right direction are rotatably supported by the speed reducer case, and a body formed around the axle and the body at the speed reducer case are provided. And a bevel gear of a large gear supported by the body portion and a small gear supported by the cylindrical portion are engaged with each other, and are slidably engaged with the input shaft in the axial direction. A brake device for a buggy vehicle comprising a multi-plate friction brake in which a rotating friction plate and a stopping friction plate axially slidably engaged with a cylindrical portion are superposed. 2. The multi-plate type friction brake according to claim 1, wherein an oil supply path extending tangentially from a body portion outside the large gear and communicating with an upper portion of the multi-plate type friction brake provided on the cylindrical portion is formed. For wet buggy vehicles. 3. The brake device for a buggy vehicle according to claim 2, wherein the reduction gear case has a return oil passage formed from below the multi-plate friction brake to the bottom of the body. 4. The left and right driving wheels are directly connected by a driving axle,
A large gear connected to the drive axle and a small gear provided on an input shaft extending rearward from a front power unit are meshed with each other so as to be transmittable, and a brake of a buggy vehicle having a friction brake attached to the input shaft. apparatus.