JP2640652B2 - Parking brake device for off-road vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake device for a vehicle using a foot-operated brake as a parking brake.

BACKGROUND OF THE INVENTION In three- and four-wheeled vehicles having a small steering bar handle,
With the increase in the weight of the vehicle body and the increase in the size of the vehicle body, foot-operated parking brakes have been used instead of manual parking brakes.

In this case, it can be considered that the parking brake is set by locking the brake pedal of the foot-operated brake at the braking position. In this case, it is conceivable to lock the brake pedal at the depressed position by the ratchet mechanism,
In a vehicle having a steering bar handle and a straddle-type driving seat, the ratchet mechanism can be easily operated / released in a driving posture in which the bar handle is held with at least one hand and both feet are placed on the footrest. is necessary.
In addition, operating the ratchet mechanism from a distance via a wire or the like has a problem that the number of components increases. Further, in this type of vehicle, an obstacle on the road surface hits the foot pedal or the grass easily winds around. Therefore, it is necessary that the ratchet mechanism and its operation mechanism be sufficiently protected from such obstacles and grass.

(Object of the Invention) The present invention has been made in view of such circumstances,
Utilizing a rigid foot-operated brake, good operability,
It is another object of the present invention to provide a parking brake device for a vehicle in which an obstacle or grass on a road surface is less likely to hit or wind.

(Constitution of the Invention) According to the present invention, an object is to provide a vehicle body frame having a pair of left and right rear wheels, a pair of left and right lower frame members long between the two rear wheels in the front-rear direction, An engine mounted above and near the center of the vehicle body, a straddle-type operation seat disposed above and behind the engine, a steering bar handle located in front of the operation seat, and left and right sides of the engine And a pair of left and right footrests, and a foot-operated brake pedal that is rotatably supported behind one footrest and has a stepped portion extending forward of the footrest. A recess is formed on the side of the engine, facing the support shaft of the brake pedal in front of the rear wheel and facing above one of the lower frame members, and is held on the lower frame member side. A ratchet mechanism having a ratchet claw and a ratchet gear fixed to the support shaft of the brake pedal, and a ratchet mechanism for restricting rotation of the brake pedal in a brake release direction, and a manual operation mechanism for releasing the ratchet mechanism. A lever, which is disposed in the recess, raises the manual operation mechanism higher than the footrest, and a lever for locking a link connected to a rear brake on a support shaft of the brake pedal is provided with the ratchet teeth and the lower frame in plan view. This is achieved by a parking brake device for an all-terrain vehicle, which is fixed to the outside of a member.

(Embodiment) FIG. 1 is a side view showing a partially cutaway four-wheel drive vehicle for running on rough terrain as one embodiment of the present invention, FIG. Is a plan view of the ratchet mechanism,
FIG. 4 is a partially sectional side view of the ratchet mechanism.

In FIGS. 1 and 2, reference numeral 10 denotes a vehicle body frame, reference numerals 12 and 12 denote front wheels, reference numerals 14 and 14 denote rear wheels, and reference numeral 16 denotes an engine mounted near the center of the vehicle body. The body frame 10 has lower frame members 10a and 10b that are long in the front-rear direction passing between the left and right rear wheels 14 and 14.
The engine is located on the lower frame members 10a and 10b and located forward of the rear wheel 14. Wide ultra-low pressure tires (so-called balloon tires) are mounted on the front wheels 12 and the rear wheels 14.

The engine 16 has a distributor 18 extending downward at the left rear thereof.
Is provided. The output shaft of the engine projects rearward through the top of the distributor 18 while the rotation of the output shaft is driven forward from the lower portion of the distributor 18 by a gear train (not shown) within the distributor 18. It is transmitted to the dispenser output shaft 20 projecting toward it.

A front-end reduction gear 26 is fixed to the front of the body frame 10,
The rotation of the distributor output shaft 20 is transmitted to a front-end reduction gear 26 by a front drive shaft 28 passing below the engine 16, and further, by a pair of left and right front drive shafts 30 (only one is shown in FIG. 2), 12a (only one shown). The knuckle bracket (not shown) of the front wheel 12 is held up and down by an upper arm 32 having a substantially A shape in plan view and a lower arm including a front drive shaft 30 and a tension rod 34, and is similar to a so-called double wishbone type. A front wheel suspension is formed. Reference numerals 36, 36 denote cylindrical shock absorbers of the front wheel 12.

Reference numeral 38 denotes a rear arm for holding the rear wheel 14, the front end of which is pivotally supported by the vehicle body frame 10, and the rear end reducer 40 is integrally attached to the rear end capable of moving up and down. Thereafter, the rear wheel 14 is fixed to a rear wheel axle 42 projecting from the final reduction gear 40 to the left and right sides. The rear arm 38 is elastically supported by a cylindrical shock absorber 44. The rotation of the output shaft of the engine 16 is transmitted to a rear final reduction gear 40 via a rear drive shaft (not shown) inserted into a left pipe of the rear arm 38, and further transmitted to a rear wheel shaft 42.

A steering bar handle 46, a fuel tank 48, and a straddle-type operation seat 50 that is long in the front-rear direction are disposed in the upper part of the vehicle body from the front.

Reference numeral 52 denotes an intake cleaner, which is provided below the operation seat 50. Reference numeral 54 denotes a carburetor connected to the rear surface of the cylinder of the engine 16, and intake air is guided from the intake purifier 52 to the carburetor 54 by a duct 56.

In FIGS. 1 and 2, 58 is a front fender, 60 is a rear fender, 62 is an exhaust muffler, 64 is a battery disposed on the right rear of the engine 16, and 66 and 66 are in front of the rear wheel 14. A pair of left and right footrests fixed to the body frame 10 so as to protrude left and right from near the lower portion of the engine 16.

68 is a brake pedal. The brake pedal 68 includes a bearing sleeve 68a rotatably held by a support shaft 70 located behind the right footrest 66, a pedal arm 68b extending forward below the footrest 66, and a pivot end. And a stepped portion 68c fixed thereto. A lever 72 is fixed to the bearing cylinder 68a.
After being attached to 38, the front end of a link 74 that is linked to a brake (not shown) is connected.

Reference numeral 76 denotes a ratchet mechanism. A ratchet gear 78 fixed to the bearing cylinder 68a so as to extend obliquely rearward and upward on the inner side in the vehicle width direction than the lever 72, and a ratchet gear 78
78 has a ratchet pawl 80 that engages from above. A substantially portal-shaped bracket 82 having an open front and rear direction is fixed to the lower tube 10a on the right side of the body frame 10, and a guide cylinder 84 is fixed to the bracket 82 so as to penetrate substantially vertically. The ratchet pawl 80 is held by the guide cylinder 84 so as to be able to move up and down in the vertical direction, and its center line is displaced rearward with respect to the support shaft 70.

86 is a manual operation mechanism for releasing the ratchet mechanism 76. This mechanism 86 is constituted by a knock mechanism frequently used for, for example, a ballpoint pen. A plurality of ridges that protrude in the radial direction and are long in the axial direction are formed on the knob 88 that protrudes upward. Deep grooves and shallow grooves are alternately formed in the inner surface of the case 86A so as to be long in the axial direction, and the ridges of the knob 88 are engaged with every other groove. On the lower end surface of the knob 88, a slope corresponding to the period of the groove is formed. When you push knob 88,
This slope hits a claw (not shown) fixed to the case 86A side and is forcibly rotated by a predetermined angle smaller than the cycle of the groove.
Engage in the groove next to A. Knob 88 if ridge enters deep groove
Is returned to the position of the imaginary line in FIG. 4, and if the ridge enters the shallow groove, the state of the solid line in FIG.

Therefore, the ratchet pawl 80 is pushed downward through a spring 86B by manually pushing the knob 88 projecting upward downward as shown in FIG. 4, and the pushed ratchet pawl 80 and the ratchet gear 78 are separated. Ratchet mechanism
Form 76. When the knob 88 is pushed downward again, the knock mechanism returns the knob 88 so as to protrude upward (the imaginary line position in FIG. 4). If the brake pedal 68 is slightly depressed in this state, the engagement between the ratchet pawl 80 and the ratchet gear 78 is released. Accordingly, the ratchet pawl 80 also retreats upward and separates from the ratchet gear 78.

Press the knob 88 to apply the parking brake
The state shown in FIG. When the brake pedal 68 is depressed in this state, the ratchet gear 78 rotates clockwise while sequentially pushing up the ratchet pawl 80. And this brake pedal 68
The ratchet gear 78 is ratchet pawl
80 is locked by pressing it in a direction substantially orthogonal to the direction in which it moves forward and backward (vertical direction). That is, since the reciprocating direction of the ratchet pawl 80 is deviated rearward of the support shaft 70, the rotation of the brake pedal 68 in the stepping-in direction is permitted, but the rotation in the opposite direction is restricted.

During normal running, the knob 88 is returned to the state shown by the phantom line in FIG. At this time, the ratchet mechanism 76
Is canceled.

Here, the ratchet mechanism 76 and the manual operation mechanism 86 are disposed in a concave portion 16a formed on the right side surface of the engine 16, as is apparent from FIG. The recess 16a is located forward of the rear wheel 14, and faces above the lower frame member 10a on the right side.
The manual operation mechanism 86 stands up to a position sufficiently higher than the footrest 66. For this reason, the ratchet mechanism 76 and the manual operation mechanism 86 located in the recess 16a do not protrude greatly from the engine 16 or the body frame 10, and the footrest 66 is provided in front of them and the rear wheel is provided in the rear.
14 are provided, and below them, the lower frame member 10
Because there is a, obstacles on the road surface are hard to hit these,
There is no danger of grass wrapping around.

In addition, since the manual operation mechanism 86 stands higher than the footrest 66 and is located behind the footrest 66 near the inner end in the vehicle width direction, the driver operates while holding the bar handle 46 with the left hand. can do.
That is, if the upper body is bent and the right hand is inserted between the right foot and the engine 16, or the upper body is twisted to the right and the right hand is turned to the outside of the right foot to bend the upper body, the manual operation mechanism 86 can be easily operated with the right hand Yes, good operability.

The link 74 connected to the rear brake is locked by a lever 72 fixed to the bearing cylinder 68a of the brake pedal 68.Since this lever 72 is located outside the ratchet gear 78 in the vehicle width direction, the link 74 Does not interfere with the lower frame member 10a.

FIG. 5 shows a ratchet mechanism 76A and a manual operation mechanism 86A.
FIG. 10 is a side sectional view showing another embodiment of the present invention. In this embodiment, a ratchet pawl 80A is provided with a return behavior downward by a spring 100, and a cam lever 102 is rotatably attached to the upper end of the ratchet pawl 80A.

According to this embodiment, when the parking brake is activated, the cam lever 102 is tilted forward as shown by the solid line, and the ratchet pawl 80A is projected downward. At this time, the ratchet pawl 80A is pressed against the ratchet gear 78A by the spring 100,
The clockwise rotation of the brake pedal 68 is allowed, and the rotation in the opposite direction is restricted. During normal running, the cam lever 102 may be tilted backward as indicated by the imaginary line, and the ratchet pawl 80A may be disengaged from the ratchet gear 78A.

As the manual operation mechanism for releasing the ratchet mechanism, various configurations other than the above-described embodiment are possible, and for example, a mechanism in which the ratchet pawl is detached from the ratchet gear by a feed screw mechanism may be used.

(Effect of the Invention) As described above, since the present invention uses the foot-acting brake pedal for the parking brake, the rigidity of the brake system is high and a strong parking brake force can be obtained. Further, since the brake pedal can be locked at an arbitrary depressed position by the ratchet mechanism, it is not necessary to perform the locking operation while depressing the pedal, and the operability is improved. Further, even if the amount of depression of the brake pedal changes due to wear of the brake shoes and brake pads, the brake pedal can be locked at an arbitrary position by the ratchet mechanism, so that it is not necessary to frequently perform the brake adjustment.

Furthermore, since the ratchet mechanism and the manual operation mechanism are arranged in the recess provided on the side of the engine, while holding the bar handle with one hand, put the other hand between the foot and the engine, bending the upper body, By passing the other hand through the outside of the foot on the same side while twisting the upper body, the manual operation mechanism can be easily operated, and the operability is good. The recess is located above one of the lower frame members, and the footrest is located in front of the lower frame member, and the rear wheel is located behind and outside, so that the ratchet mechanism and the manual operation mechanism housed in the recess are Therefore, the vehicle is protected by the recess, the footrest, the lower frame member, the rear wheel, and the like, so that it is possible to prevent an obstacle or grass on the road surface from hitting or winding. Further, since the lever on the footrest side to which the link of the rear brake is locked is disposed outside the ratchet gear, there is no possibility that the link interferes with the lower frame member.

[Brief description of the drawings]

FIG. 1 is a side view showing a cross section of a four-wheel drive vehicle for traveling on rough terrain as one embodiment of the present invention, FIG. 2 is a plan view showing a partially cut-away view, and FIG. FIG. 4 is a plan view, FIG. 4 is a side view partially showing a ratchet mechanism, and FIG. 5 is a side view showing a ratchet mechanism according to another embodiment. 10 Body frame, 10a Lower frame member, 16
Engine, 16a …… Recess, 46 …… Steering bar handle, 50
… Driving seat, 66… Foot rest, 68 …… Brake pedal, 68c …… Stepping part, 72 …… Lever, 74 …… Link, 76, 76A …… Ratchet mechanism, 78 …… Ratchet gear, 80, 80A… … Ratchet claw, 86, 86A …… Manual operation mechanism.

Claims (1)

(57) [Claims] 1. A body frame having a pair of left and right rear wheels, a pair of left and right lower frame members extending in the front-rear direction passing between the two rear wheels, and mounted near the center of the vehicle body above the lower frame members. An engine, a straddle-type operation seat long before and after the engine, a steering bar handle located in front of the operation seat, and a pair of left and right footrests located on both left and right sides of the engine. A foot-operated brake pedal that is rotatably supported behind one footrest and has a stepped portion extending forward of the footrest. A recess facing the support shaft of the brake pedal and facing above one of the lower frame members, and the ratchet pawl held on the lower frame member side and the brake A ratchet mechanism having a ratchet gear fixed to a support shaft of a key pedal and restricting rotation of the brake pedal in a brake release direction, and a manual operation mechanism for releasing the ratchet mechanism are provided in the concave portion; While raising the manual operation mechanism higher than the footrest, a lever for locking a link connected to a rear brake is fixed to the spindle of the brake pedal outside the ratchet teeth and the lower frame member in plan view. A parking brake device for an off-road vehicle.