JP4212009B2 - Parking brake device for motorcycles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a parking brake device provided in a two-wheeled vehicle provided with a hydraulic disc brake including a disc rotor attached to one end surface in the width direction of a wheel boss portion of a wheel and a hydraulic caliper disposed around the disc rotor.
[0002]
[Prior art]
In a motorcycle equipped with a hydraulic disc brake, a master cylinder is operated by a turning operation force of a brake lever provided on a handle to generate hydraulic pressure, and the disc brake is operated by this hydraulic pressure to obtain a required braking force. .
[0003]
Incidentally, it has been impossible in the past to provide a parking function to such a hydraulic disc brake. In other words, even if the brake lever is fixed at the operating position and the hydraulic disc brake is maintained in the operating state, the hydraulic power fluctuates due to the passage of time or temperature, so that the braking force gradually decreases. There was a problem that the parking brake function could not be obtained.
[0004]
Therefore, conventionally, a mechanical brake is integrally incorporated in a caliper of a hydraulic disc brake, and when the car is parked, the caliper is driven by the mechanical brake to perform a required parking function.
[0005]
[Problems to be solved by the invention]
However, when a mechanical brake is integrated into the caliper of a hydraulic disc brake, the caliper becomes larger and heavier, resulting in an increase in cost and a decrease in appearance. This is disadvantageous and causes problems such as knitting wear on the brake pads.
[0006]
The present invention has been made in view of the above problems, and the purpose of the process is to ensure a parking brake function with a simple configuration without incurring an increase in caliper size, weight, and knitting center of gravity. An object of the present invention is to provide a parking brake device for a motorcycle that can prevent knitted wear of a brake pad.
[0007]
In order to achieve the above object, the invention according to claim 1 is a transmission case including a power transmission mechanism of a unit swing type engine disposed on one side in the width direction of a wheel boss portion of the wheel, and the wheel. A parking brake device provided in a motorcycle, comprising: a disc rotor attached to the other surface side of the boss portion in the width direction; and a hydraulic disc brake including a hydraulic caliper disposed around the disc rotor. And a brake shoe disposed in the wheel boss portion, and a drum brake that is disposed so as to project from the wheel boss portion toward the disc rotor mounting surface side and expands the brake shoe. It is characterized by.
[0008]
The invention according to claim 2 is characterized in that the lever protruding toward the disk rotor mounting surface penetrates the inner peripheral portion of the disk rotor in the rear axle direction.
[0009]
Therefore, according to the first aspect of the present invention, since the existing wheel boss portion is used as a brake drum of a mechanical drum brake provided separately from the hydraulic disc brake, the structure is not complicated or enlarged. The desired parking function can be stably secured, and there is no need to integrate a mechanical brake into the caliper of the hydraulic disc brake as in the past, and the caliper is increased in size and weight, resulting in an increase in cost. Appearance is not deteriorated, and the center of gravity of the caliper is biased, so that it is not disadvantageous against vibration and problems such as knitting wear of the brake pad do not occur.
[0010]
According to the second aspect of the present invention, since the parking brake device is constituted by the disk rotor that is one of the components of the hydraulic disk brake and the mechanical caliper that sandwiches the disk rotor, the structure is complicated and large-sized. The desired parking function can be stably ensured without incurring a reduction in size, and it is not necessary to integrate a mechanical brake into the caliper of a hydraulic disc brake as in the prior art. Therefore, there is no increase in cost and appearance deterioration, and the center of gravity of the caliper is biased, so that it is not disadvantageous against vibrations and problems such as knitting wear of the brake pad do not occur.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0012]
<Embodiment 1>
FIG. 1 is a side view of a scooter type motorcycle, and FIG. 2 is a cross-sectional view of a rear wheel portion of the motorcycle.
[0013]
In the scooter type motorcycle 1 shown in FIG. 1, a head pipe 2 is located at the front upper part of the vehicle body, and a steering shaft 3 is rotatably inserted into the head pipe 2. A steering wheel 4 is attached to the upper end of the steering shaft 3, and a front fork 5 is attached to the lower end of the steering shaft 3, and a front wheel 6 is connected to a front axle 7 at the lower end of the front fork 5. Is rotatably supported by the shaft. A disc rotor 8 of a hydraulic disc brake that is hydraulically operated is attached to the hub of the front wheel 6.
[0014]
From the top and bottom of the head pipe 2, the main pipe 9 and the down tube 10 extend obliquely downward toward the rear of the vehicle body, and then bend and extend obliquely upward toward the rear of the vehicle body. It is connected by a lug 11. A seat rail frame 12 extends from the lug 11 toward the rear of the vehicle body.
[0015]
On the other hand, 13 is a tandem seat disposed behind the handle 4, and a unit swing type engine 14 as a power unit is provided below the seat 13. The unit swing type engine 14 is configured by integrating an engine 15 as a drive source and a transmission case 16 having a built-in V belt type automatic transmission and a power transmission mechanism (not shown). A rear wheel 17 is rotatably supported by a rear axle 18 at the rear end of the rear wheel 17.
[0016]
Thus, the unit swing type engine 14 is supported at its front upper part by the lug 11 via the link member 19 so as to be swingable, and its rear end upper part together with the rear wheel 17 via the rear cushion 20 is the seat. It is supported by the rail frame 12.
[0017]
In FIG. 1, 21 is a fuel tank, 22 is a rear carrier, 23 is a backrest, and the vehicle body is covered with a resin vehicle body cover 24.
[0018]
As shown in FIG. 2, the rear axle 18 is rotatably supported by a bearing 25 on the transmission case 16 of the unit swing type engine 14, and the rear wheel 17 is attached to the rear axle 18. .
[0019]
A boss portion 26A of the wheel 26 of the rear wheel 17 is formed in a drum shape, and a ring-shaped disk rotor 27 is attached to one end surface in the width direction by a plurality of bolts 28. The disc rotor 27 and a caliper (not shown) that sandwiches the disc rotor 27 with a brake pad (not shown) that is operated by hydraulic pressure constitute a hydraulic disc brake.
[0020]
And the large diameter part 26A-1 formed in the width direction substantially center part of the wheel boss | hub part 26A of the rear wheel 17 comprises the brake drum, and the inner side of the large diameter part 26A-1 which comprises this brake drum. Two brake shoes 29 that can be expanded are arranged, and these constitute a mechanical drum brake 30. In the drum brake 30, a cam (not shown) is driven by operating a brake lever (not shown) and rotating the lever 31, whereby the two brake shoes 29 are opened in the radial direction and serve as a brake drum. The wheel boss 26A is pressed to the inner periphery of the large diameter portion 26A-1. Therefore, if the brake lever is locked in the operating state, the rotation of the rear wheel 17 is locked and the drum brake 30 functions as a parking brake.
[0021]
Further, a sensor ring 32 having a gear tooth surface engraved on the inner peripheral portion thereof is fitted to the inner peripheral surface of the small diameter portion 26A-2 on the side of the wheel boss portion 26A of the rear wheel 17 where the disk rotor 27 is attached. A wheel sensor 33 for optically detecting the rotational speed of the rear wheel 17 is fixed in the vicinity of the sensor ring 32. The rotational speed detected by the wheel sensor 33 is used for controlling the brake hydraulic pressure in the antilock brake system (ABS).
[0022]
As described above, in the present embodiment, since the existing wheel boss portion 26A is used as a brake drum of the mechanical drum brake 30 provided separately from the hydraulic disc brake, the structure is complicated and enlarged. The desired parking function can be stably secured. Therefore, there is no need to integrate a mechanical brake into the caliper of the hydraulic disc brake as in the prior art, the caliper does not increase in size and weight, resulting in an increase in cost and appearance, and the caliper As a result, the center of gravity is not disadvantageous against vibrations, and problems such as knitting wear of the brake pads do not occur.
[0023]
Further, since the sensor ring 32, the wheel sensor 33, and the brake shoe 29 are partitioned by the wall portion 26a of the wheel 26, the wear powder of the brake shoe 29 is prevented from adhering to the sensor ring 32 and the wheel sensor 33.
[0024]
<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view of the rear wheel portion of the motorcycle showing the configuration of the parking brake device according to the second embodiment of the present invention. In this figure, the same elements as those shown in FIG. Hereinafter, description thereof will be omitted.
[0025]
The parking brake device according to the present embodiment is configured by using a small-diameter portion 26A-2 of the wheel boss portion 26A of the rear wheel 17 as a brake drum of the drum brake 30, and disposing a brake shoe 29 inside thereof. Yes. A sensor ring 32 and a wheel sensor 33 are disposed on the opposite side of the brake shoe 29 across the wall portion 26 a of the wheel 26.
[0026]
Thus, also in this embodiment, since the existing wheel boss portion 26A is used as the brake drum of the mechanical drum brake 30 provided separately from the hydraulic disc brake, the same effect as in the first embodiment is obtained. It is done.
[0027]
Further, since the sensor ring 32, the wheel sensor 33, and the brake shoe 29 are partitioned by the wall portion 26a of the wheel 26, the wear powder of the brake shoe 29 is prevented from adhering to the sensor ring 32 and the wheel sensor 33.
[0028]
<Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIGS. 4 is an exploded perspective view of the parking brake device according to Embodiment 3 of the present invention, and FIG. 5 is a side view of the parking brake device.
[0029]
The parking brake device according to the present embodiment includes a disk rotor 27 of a hydraulic disk brake and a mechanical caliper 35 that mechanically clamps the disk rotor 27. The mechanical caliper 35 is centered by a bolt 36. A pair of arms 38 and 39 pivotally attached to the stopper 37 are provided, and the stopper 37 is attached to a transmission case of a unit swing type engine (not shown).
[0030]
The arms 38 and 39 are biased to the opening side by the torsion coil spring 40, and the opening angle thereof is regulated by the contact of one end of each of them with the corner 37a of the stopper 37 (FIG. 5). reference).
[0031]
That is, as shown in FIG. 4, circular holes 38a (only one is shown in FIG. 4) are formed in the central portions of the arms 38, 39, and the collar 41 is passed through these circular holes 38a. The torsion coil spring 40 is wound around the outer periphery of the collar 41. Both ends of the torsion coil spring 40 are bent in an L shape, and these are engaged with circular holes 38b and 39b formed in the arms 38 and 39, respectively.
[0032]
Thus, the bolt 41 is inserted into the collar 41, and the bolt 36 is screwed to the nut member 42 attached to the back surface of the stopper 37, whereby the pair of arms 38 and 39 are attached to the stopper 37. The arms 38 and 39 are pivotally mounted so as to be rotatable, and are biased to the open side by a torsion coil spring 40.
[0033]
By the way, the brake shoes 43 are respectively attached to the opposing surfaces of the respective one ends of the arms 38 and 39, and a notch 39c through which the brake wire 44 is inserted is formed at the other end of the one arm 39. The other end of the other arm 38 is formed in a bifurcated shape, and a circular hole 38c for fitting and holding the columnar piece 45 is formed in this portion.
[0034]
On the other hand, a screw member 46 is attached to the end portion of the brake wire 44, and this screw member 46 is inserted through the top 45 fitted and held in a circular hole 38c formed in the end portion of the arm 38. It is attached to the end of the arm 38 so as to be adjustable in length by a nut 47 threaded through the circular hole 45a and screwed into the end.
[0035]
In the mechanical caliper 35 having the above configuration, the arms 38 and 39 are open as shown in FIG. 5 when not in operation, and the rear wheel and the disc rotor 27 can freely rotate.
[0036]
Thus, when the motorcycle is parked, if a brake wire (not shown) is operated and the brake wire 44 is pulled, the arms 38 and 39 of the mechanical caliper 35 are closed against the urging force of the torsion coil spring 40, and these are applied to the brake. The mechanical caliper 35 functions as a parking brake because the both sides of the disk rotor 27 are clamped via the shoe 43 to lock the rotation of the disk rotor 27 and the rear wheels.
[0037]
As described above, the parking brake device according to the present embodiment uses the disk rotor 27 that is one of the components of the hydraulic disk brake, and includes the mechanical caliper 35 that holds the disk rotor 27. The desired parking function can be stably ensured without complicating the structure or increasing the size. Therefore, there is no need to integrate a mechanical brake into the caliper of the hydraulic disc brake as in the prior art, the caliper does not increase in size and weight, resulting in an increase in cost and appearance, and the caliper As a result, the center of gravity is not disadvantageous against vibrations, and problems such as knitting wear of the brake pads do not occur.
[0038]
As apparent from the above description, according to the first aspect of the invention, since the form of the brake drum portion constituting the drum brake of the machine械式separately from the hydraulic disc brake, as in the prior art Because there is no need to integrate a mechanical brake into the caliper of a hydraulic disc brake, the caliper does not increase in size and weight, resulting in an increase in cost and appearance, and the center of gravity of the caliber is biased. There is no disadvantage to vibration, and problems such as knitted wear of the brake pad do not occur.
[Brief description of the drawings]
FIG. 1 is a side view of a scooter type motorcycle.
FIG. 2 is a cross-sectional view of the rear wheel portion of the scooter type motorcycle showing the configuration of the parking brake device according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view of a rear wheel portion of a scooter type motorcycle showing a configuration of a parking brake device according to a second embodiment of the present invention.
FIG. 4 is an exploded perspective view of a parking brake device according to a third embodiment of the present invention.
FIG. 5 is a side view of a parking brake device according to a third embodiment of the present invention.
[Explanation of symbols]
1 Scooter type motorcycle (motorcycle)
17 Rear wheel
26 Wheel 26A Wheel boss portion 27 Disc rotor 29 Brake shoe 30 Drum brake 35 Mechanical caliper

Claims (2)

A transmission case incorporating a power transmission mechanism of a unit swing engine disposed on one surface side in the width direction of the wheel boss portion of the wheel ;
A hydraulic disc brake including a disc rotor attached to the other surface side in the width direction of the wheel boss portion and a hydraulic caliper disposed around the disc rotor ;
A parking brake device provided in a motorcycle comprising:
A brake shoe disposed in the wheel boss ,
A lever that projects from the wheel boss portion to the disk rotor mounting surface side and widens the brake shoe;
A parking brake device for a two-wheeled vehicle comprising a drum brake comprising: 2. The parking brake device for a motorcycle according to claim 1, wherein the lever protruding toward the disk rotor mounting surface passes through an inner peripheral portion of the disk rotor in a rear axle direction.

Images