JP3282054B2 - Hydraulic master cylinder device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a motorcycle and a motorcycle.
The present invention relates to a hydraulic master cylinder device for a vehicle including a hydraulic master cylinder for hydraulically operating brakes and clutches of a four-wheeled vehicle, and a reservoir for supplying hydraulic fluid to the hydraulic master cylinder. The present invention relates to a structure that prevents air in a reservoir from being caught by hydraulic fluid in a hydraulic master cylinder when a vehicle body is set up for storage or transportation.

[0002]

2. Description of the Related Art In motorcycles and three- and four-wheeled buggies, the storage space is effectively used by standing upright with the rear wheels down for long-term storage and transportation. In this case, the reservoir of the hydraulic master cylinder device is turned over, and the hydraulic master cylinder is positioned higher than the reservoir, so that air above the fluid level in the reservoir enters the hydraulic master cylinder, and the hydraulic master cylinder May be mixed as air bubbles in the hydraulic fluid, and the operation feeling of the pedal and lever will be fluffy and less rigid.
There is a problem that the initial stroke is delayed or the vapor lock phenomenon is likely to occur due to an increase in the pedal stroke or the lever stroke.
A technique disclosed in Japanese Patent Publication No. 5 has been proposed.

In this hydraulic master cylinder device, a reservoir is rotatably mounted on a bar handle by a mounting holder, a locking pin is implanted in the bar handle, and a plurality of locking and disengaging pins are mounted on the mounting holder. By forming a locking groove for the reservoir, the mounting angle of the reservoir can be changed, and the reservoir and the hydraulic master cylinder are connected by a flexible connector. The liquid surface of the hydraulic fluid is held at a position higher than the communication hole with the hydraulic master cylinder to prevent air from entering the hydraulic fluid of the hydraulic master cylinder.

[0004]

However, the above technique is
Since a bar handle is a constituent requirement, it cannot be applied to a vehicle with a round handle, and application to a brake is limited to only front wheels, and cannot be applied to a brake for rear wheels.

Accordingly, the present invention provides a hydraulic master cylinder device for a vehicle in which the air in the reservoir does not mix with the hydraulic fluid of the hydraulic master cylinder when the vehicle is placed upright.
It is an object of the present invention to be applicable to both front wheels and rear wheels regardless of the shape of a steering wheel of a vehicle.

[0006]

According to the above-mentioned object, a first method is provided.
According to the invention, a hydraulic master cylinder for increasing the hydraulic fluid for the brakes and clutches and a reservoir for supplying the hydraulic fluid to the hydraulic master cylinder are formed separately, and the reservoir and the hydraulic master cylinder are formed in a tubular connector. In the vehicle hydraulic master cylinder device, the connector is provided so as to protrude from one of the hydraulic master cylinder and the reservoir in the width direction of the vehicle body, and the other of the hydraulic master cylinder and the reservoir is connected to the connector. A connector connection hole is formed in a side wall, and the connector connection hole is fitted to a tip of the connector via a bearing, and a double drop is attached to a lower portion of the reservoir.

In the second invention, a hydraulic master cylinder for increasing the hydraulic fluid for the brake or clutch and a reservoir for supplying the hydraulic fluid to the hydraulic master cylinder are formed separately, and the reservoir and the hydraulic master are formed separately. A hydraulic master cylinder device for a vehicle that connects a cylinder with a tubular connector, the connector protruding from the hydraulic master cylinder, and at least a distal end of the connector is disposed in a width direction of the vehicle body, A connector connection hole is formed in a side wall of the connector, and the connector connection hole is fitted to the tip of the connector via a bearing, and a double drop is attached to a lower portion of the reservoir.

[0008]

According to these constructions, the reservoir can be pivoted around the bearing in the front-rear direction of the vehicle body, and the position of the reservoir can be held in the vertical direction at any position by the lower suspension. When the vehicle body is placed upright, the level of the hydraulic fluid in the reservoir can be arranged above the communication hole with the hydraulic master cylinder.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3, and a second embodiment of the present invention will be described with reference to FIGS. The first embodiment and the second embodiment are applied as a hydraulic master cylinder device for a rear wheel disc brake or a front wheel disc brake of an off-road motorcycle or a three-wheel buggy. FIG. 3 showing a front view will be described in common with both embodiments.

[0010] First, the outline of the vehicle body 1 shown in FIG. 3 will be described. A front wheel 4 is suspended at a lower end of a front fork 3 steered by a bar handle 2 and pivotally pivoted to a rear portion of the vehicle body frame 5. A rear wheel 7 is suspended from a lower end of the supported swing arm 6. Rear wheel 7 and rear fender 8
A seat rail 9 extending from the vehicle body frame 5 is disposed between the seat rails and a guide stay 10 is fixed to a rear end of the seat rail 9.

A front wheel disc brake 11 is provided on one side of the front wheel 4, and a rear wheel disc brake 12 is provided on the other side of the rear wheel 7. Bar handle 2
A hydraulic master cylinder device 50 used for the front wheel disc brake 11 is attached, and a hydraulic master cylinder 51 of the hydraulic master cylinder device 50 and a caliper body 13 of the front wheel disc brake 11 are connected by a brake hose 14. I have. A hydraulic master cylinder device 20 used for the rear wheel disc brake 12 is attached to a rear portion of the body frame 5.
The hydraulic master cylinder 21 and the caliper body 15 of the rear disc brake 12 are connected by a brake hose 16.

When the vehicle body 1 is stored or transported for a long period of time, the rear wheel 7 and the guide stay 10 are grounded,
Or by hanging the front wheel 4 on a guide bar (not shown) provided appropriately in the storage area,
In the same way, by standing up, the limited storage space can be used effectively.

Next, a first embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view taken along the line II of FIG. 2, and FIG. 2 is an enlarged view of a main part of the vehicle body 1 to which the hydraulic master cylinder device 20 is attached as viewed in a normal traveling state.

A hydraulic master cylinder device 20 used for the rear wheel disc brake 12 includes a vertical hydraulic master cylinder 21 for increasing the working fluid, a separate reservoir 22 for storing the working fluid for replenishment, and these components. Connecting tubular connector 23
It consists of

The hydraulic master cylinder 21 has a cylinder body 24 mounted on the lower curved portion of the rear portion of the body frame 5 with a slight inclination in the vehicle longitudinal direction.
A piston 26 is liquid-tightly and movably inserted into a cylinder hole 25 formed by opening the lower end of the cylinder 4. The piston 26 is supported on the upper end of a push rod 28 pivotally attached to a brake pedal 27 and has a cup seal 29
The upper part of the cylinder hole 25 from the piston 26 serves as a hydraulic chamber 30.

The piston 26 and the cylinder hole 2 of the hydraulic chamber 30
5, a return spring 31 is contracted, and the piston 26 and the push rod 28
Is always urged in the non-operation direction by the return spring 31. In the upper wall 24a of the cylinder hole 25, a union hole 32 serving as a discharge port for the hydraulic fluid is provided.
The union hole 32 is provided with
A hose banjo 34 fixed to an end of the brake hose 16 is connected by a union bolt 35.

A boss 24c protrudes from one side wall 24b of the cylinder body 24.
d is formed. A relief port 36 and a supply port 37 are formed through the one side wall 24b between the cylinder hole 25 and the fitting recess 24d. In this embodiment, the fitting recess 24d, the relief port 36, The supply port 37 forms a communication hole 38 according to the present invention.

A flange 23a having the same shape as the boss 24c is provided around one side of the connector 23. A short pipe portion connected from the flange 23a to the hydraulic master cylinder 21 on one side. 23b and flange 23a
From the other side to the long tube portion 23c for mounting the reservoir 22
And that. In the connector 23, the short tube portion 23b is fitted in a fitting recess 24d of the boss portion 24c in a liquid-tight manner via a sealing material 39, and the flange 23a is screwed to the boss portion 24c.
c, and protrudes in the vehicle width direction.

In the reservoir 22, a connector connection hole 42a and a vehicle body fixing piece 42b are provided on a side wall of a storage tank 42 having a cap 41 attached thereto.
3 is erected. The reservoir 22 inserts the long tube portion 23c of the connector 23 into the connector connection hole 42a,
It is mounted between the connector connection hole 42a and the long tube portion 23c via a seal bearing 44 so as to be liquid-tight and rotatable in the front-rear direction of the vehicle body 1. With this connection, the cylinder hole 25 of the hydraulic master cylinder 21 and the storage tank 42 of the reservoir 22 are connected.
Are communicated with each other through the communication hole 38 and the connector 23 so that the hydraulic fluid in the cylinder hole 25 and the storage tank 42 can be mutually circulated.

The dovetail 43 is formed by casting an upper casting piece 43a into a bottom wall 42c when the storage tank 42 is formed.
The reservoir 22 is vertically suspended at a position below the connector connection hole 42 a so that the vertical position of the reservoir 22 is always maintained by the double suspension 43. The vehicle body fixing piece 42b protruding from the storage tank 42 is used to
During normal running or the like other than standing up as described above, it is fixed to the vehicle body frame 5 with a set screw 45 so that the reservoir 22 does not rotate unnecessarily due to running vibration or the like.

The hydraulic master cylinder 20 for the rear wheel of the present embodiment
Is configured as described above, and the brake pedal 27
Is operated, the push rod 28 moves upward,
After the piston 26 is pushed to the upper part of the cylinder hole 25 and the cup seal 29 closes the relief port 36, the hydraulic fluid in the hydraulic chamber 30 is gradually pressurized. Hydraulic chamber 30
The hydraulic fluid pressurized by the above is sent from the union bolt 35 in the union hole 32 to the caliper body 15 of the rear wheel disc brake 12 through the brake hose 16 to brake the disc rotor 46 which rotates integrally with the rear wheel 7.

When the vehicle body 1 is to be set up for storage or transportation, the set screw 45 of the vehicle body fixing piece 42b is removed in advance, and the reservoir 22 is set in a rotatable state. Next, when the front side of the vehicle body 1 is raised, the reservoir 22
However, while maintaining the vertical state due to the lower suspension 43, the vehicle body 1 relatively rotates toward the front of the vehicle body around the connector 23 via the seal bearing 44, and the rear wheel 7 and the guide stay 10 are grounded to ground the vehicle body 1. When the hydraulic master cylinder 21 and the reservoir 22 are in the upright position, the imaginary line in FIG.
It deviates as shown in FIG.

In this embodiment, the reservoir 22 is
The seal bearing 44 allows the connector 23 to be relatively rotated around the connector 23 toward the front of the vehicle body, and the lower suspension 43 allows the vehicle body 1 to be maintained in a vertical state even when the vehicle 1 is being raised or placed upright. As a result, the liquid level of the hydraulic fluid in the storage tank 42 can be always arranged at a higher position than the communication hole 38, so that air above the liquid level of the storage tank 42 does not enter the cylinder hole 25, The rigidity of the brake pedal 27 is ensured, the initial braking is improved, and the vapor lock phenomenon hardly occurs.

Further, in the present embodiment, when the vehicle body 1 is not set up, the vehicle body fixing piece 42b of the storage tank 42 is
The reservoir 22 can be prevented from turning carelessly due to running vibration of the vehicle body 1 or the like.

In the case where the entirety of the connector is arranged in the width direction of the vehicle body as in the present embodiment, the connector protrudes from the reservoir side, and is provided between the connector connection hole provided in the hydraulic master cylinder and the tip of the connector. The reservoir and the connector may be integrally rotated by interposing a bearing.

Next, a second embodiment of the present invention applied to a hydraulic master cylinder device for a rear wheel disc brake will be described with reference to FIG.
A description will be given based on FIGS. Front wheel disc brake 1
The hydraulic master cylinder device 50 used in the first embodiment has a hydraulic master cylinder 51 attached to a front portion of the bar handle 2 together with a brake lever 54, a separate reservoir 52 for storing hydraulic fluid for replenishment, and a tubular connecting these. Connector 5
It consists of three.

The hydraulic master cylinder 51 has a cylinder hole 55 formed in a cylinder body 55 having a vehicle body mounting bracket 55a and lever mounting arms 55b, 55b with the brake lever 54 side opened.
A piston 57, a cup seal 58, a hydraulic chamber 59, and a return spring 60 are provided in substantially the same manner as in the first embodiment.

The brake lever 54 is connected to the lever mounting arm 5.
5b and 55b, it is pivotally supported by a pivot 61, and when the brake lever 54 is squeezed,
The working arm 54a facing the rear end of the piston 57 pushes the piston 57 in the direction of the hydraulic chamber 59, and the hydraulic chamber 59
Pressure of hydraulic fluid.

A union hole 62 is provided in the front wall 55c of the cylinder hole 56 so as to communicate with the hydraulic chamber 59, and a hose banjo 63 of the brake hose 14 is provided in the union hole 62.
Are connected by a union bolt 64. A relief port 65 and a supply port 66 are provided in the upper wall 55d of the cylinder body 55 so as to communicate with the cylinder hole 56, and a boss portion protruding upward from the upper wall 55d so as to surround the relief port 65 and the supply port 66. A fitting recess 55f is formed in 55e, and a communication hole 67 between the hydraulic master cylinder 51 and the reservoir 52 is formed by the two ports 65 and 66 and the fitting recess 55f.

The connector 53 is a hydraulic master cylinder 5
1 and a long tube portion 53b to which the reservoir 52 is attached is connected in an L-shape.
The short pipe portion 53a is fitted in a fitting recess 55f of the boss portion 55e in a liquid-tight manner via a seal material 68, and projects to one side of the short pipe portion 53a while the long pipe portion 53b is directed in the vehicle width direction. The flange 53c to be fixed to the boss 55e with a screw 69,
It is attached to the hydraulic master cylinder 51.

The reservoir 52 is provided with a connector connection hole 70a and a vehicle body fixing piece 70b on the side wall of the storage tank 70, and a casting piece 71a is provided below the storage tank 70 with a bottom wall 70c.
A double drop 71 cast on the bottom is provided. A long tube portion 53b of the connector 53 is fitted into the connector connection hole 70a via a seal bearing 72, and the reservoir 52 is arranged around the long tube portion 53b of the connector 53 oriented in the vehicle width direction.
It is mounted so as to be liquid-tight and rotatable in the front-rear direction of the vehicle body 1.

The above-mentioned reservoir 52 is held in a vertical position by a heavy drop 71. However, during normal running other than standing up the vehicle body 1, the vehicle body fixing piece 70b is attached to the upper surface of the vehicle body mounting bracket 55a. It is fixed with a set screw 73 so that unnecessary rotation is prevented.

In both of the above embodiments, the reservoir can be fixed to the vehicle body by the vehicle body fixing piece. However, even if the conventional fixed type reservoir is inclined integrally with the vehicle body, the air flowing into the cylinder hole can be prevented. As in the case where no biting or liquid leakage occurs, the present invention does not cause any particular trouble in running normally even if the reservoir is not fixed. In particular, during trial running, such as climbing up a steep cliff or running down, the reservoir can be kept vertical by rotating the reservoir according to the inclination of the vehicle body, so that the ripples and communication holes of the hydraulic fluid in the reservoir Exposure from the liquid surface can be minimized. When the reservoir is not fixed by the vehicle body fixing piece, it is not necessary to attach and detach the set screw of the vehicle body fixing piece.

[0034]

As described above, according to the structure of the present invention, even when the vehicle body is set up, the level of the hydraulic fluid in the reservoir is higher than the communication hole with the hydraulic master cylinder. The hydraulic master cylinder device which does not mix air in the hydraulic fluid of the hydraulic master cylinder while being held can be applied to both the clutch and the front and rear wheel brakes. Also, since no special parts or components are required,
It is excellent in versatility and economy, and can be applied to front wheel brakes and clutches regardless of the handle shape.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG. 2;

FIG. 2 is a front view of a state in which the hydraulic master cylinder device according to the first embodiment of the present invention is mounted on a vehicle body.

FIG. 3 is a front view showing a state where a vehicle to which the first embodiment and the second embodiment of the present invention are applied is set up;

FIG. 4 is a side view of a hydraulic master cylinder device according to a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body 2 ... Bar handle 3 ... Front fork 4 ... Front wheel 5 ... Body frame 7 ... Rear wheel 10 ... Guide stay 11 ... Front wheel disc brake 12 ... Rear wheel disc brake 13 ... Caliper body of front wheel disc brake 11 14 ... Front wheel disc Brake hose for brake 11 15 Caliper body for rear wheel disc brake 12 16 Brake hose for rear wheel disc brake 12 20 Hydraulic master cylinder device used for rear wheel disc brake 12 21 Hydraulic pressure for hydraulic master cylinder device 20 Master cylinder 22: Reservoir of hydraulic master cylinder device 20 23: Connector of hydraulic master cylinder device 20 23a: Flange of connector 23 23b: Short pipe portion connected to hydraulic master cylinder 21 23c: Long pipe for mounting reservoir 22 Part 24: Hydraulic mass Cylinder body 24c of cylinder 21 Boss 24d Fitting recess formed in boss 24c 25 Cylinder hole of cylinder body 24 Piston 27 Brake pedal 28 Push rod 29 Cup seal 30 Hydraulic chamber 32 ... Union hole 36 ... Relief port 37 ... Supply port 38 ... Communication hole composed of fitting recess 24d, relief port 36 and supply port 37 42 ... Storage tank 42a of reservoir 22 ... Connector connection hole 42b formed in the side wall of storage tank 42 ... A vehicle body fixing piece 43 protrudingly provided on a side wall of the storage tank 42... A heavy drop hanging vertically from a bottom wall 42 c of the reservoir 22 44... A seal bearing corresponding to the bearing of the present invention 50. Cylinder device 51: Hydraulic master cylinder of hydraulic master cylinder device 50 2. Reservoir 53 of hydraulic master cylinder device 50 53 Connector 53a of hydraulic master cylinder device 50 Short pipe portion 53b connected to hydraulic master cylinder 51 Long pipe portion for mounting reservoir 52 54 Brake lever 54a Brake Working arm 55 of lever 54 ... Cylinder body 55a of hydraulic master cylinder 51 55 ... Body mounting bracket 55e formed in cylinder body 55 55e Boss portion 55f Fitting recess 56 ... Cylinder hole of cylinder body 55 57 ... Piston 58 ... Cup seal 59 ... Hydraulic chamber 62 ... Union hole 65 ... Relief port 66 ... Supply port 67 ... Communication hole composed of relief port 65, supply port 66, fitting recess 55f 70 ... Reservoir 52 storage tank 70a ... Storage tank 70 side wall Connector connection holes 70b formed in the storage tank 70 A vehicle body fixing piece 70c protruding from a side wall of the storage tank 70: a bottom wall 71 of the storage tank 70 ...

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62L 3/00-3/02 B60T 11/22

Claims (2)

(57) [Claims] 1. A hydraulic master cylinder for boosting hydraulic fluid for a brake or a clutch, and a reservoir for supplying hydraulic fluid to the hydraulic master cylinder are formed separately, and the reservoir and the hydraulic master cylinder are formed in a tubular shape. In the vehicle hydraulic master cylinder device connected by the connector, the connector protrudes from one of the hydraulic master cylinder and the reservoir in the width direction of the vehicle body, and the other of the hydraulic master cylinder and the reservoir. A fluid pressure for a vehicle, wherein a connector connection hole is formed in the other side wall, the connector connection hole is fitted to a tip of the connector via a bearing, and a double drop is attached to a lower portion of the reservoir. Master cylinder device. 2. A hydraulic master cylinder for boosting hydraulic fluid for a brake or a clutch, and a reservoir for supplying hydraulic fluid to the hydraulic master cylinder are formed separately, and the reservoir and the hydraulic master cylinder are formed in a tubular shape. A hydraulic master cylinder device for a vehicle connected by a connector, wherein the connector protrudes from the hydraulic master cylinder, at least a distal end of the connector is disposed in a width direction of the vehicle body, and a connector is provided on a side wall of the reservoir. A hydraulic master cylinder device for a vehicle, wherein a connection hole is formed, the connector connection hole is fitted to a tip of the connector via a bearing, and a double drop is attached to a lower portion of the reservoir.