JPH07156853A - Liquid-pressure master cylinder device for vehicle - Google Patents

Abstract

PURPOSE:To use a liquid pressure master cylinder device widely for various handles or front and rear wheels by fitting a connector and a connector connecting hole to engage mutually with a liquid pressure master cylinder and a reservoir to each other through a bearing, and arranging additionally a weight in a lower part of the reservoir. CONSTITUTION:When a brake pedal 27 is stepped down, a piston 26 rises through a push rod 28, and after a cup seal 29 closes a relief port 36, pressure of operating liquid of a liquid pressure chamber 30 is increased. The pressure- increased operating liquid is supplied to a brake device for rear wheels from a union bolt 35 of a union hole 32. By the way, when a motorcycle or the like is vertically placed in the case of a carry or storage, fixation of a car body is released, and a reservoir 22 of a liquid pressure master cylinder device 20 is rotatably maintained. Afterwards, while maintaining a vertical condition by a weight 43 in a lower part as the front side of the car body is raised up, the reservoir 22 is relatively rotated to the car body front side around a connector 23 through a sealing bearing 44.

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, which includes a hydraulic master cylinder that hydraulically operates a brake or a clutch of a four-wheel vehicle and the like, and a reservoir that replenishes the hydraulic master cylinder with hydraulic fluid. The present invention relates to a structure that prevents air in a reservoir from being trapped in the hydraulic fluid in a hydraulic master cylinder when the vehicle body is set upright for storage or transportation.

[0002]

2. Description of the Related Art In motorcycles and three- and four-wheeled buggy vehicles, the storage space is effectively used by placing the rear wheels upside down for long-term storage and transportation. In this case, the reservoir of the hydraulic master cylinder device falls sideways, the hydraulic master cylinder is positioned higher than the reservoir, and the air above the liquid level inside the reservoir enters the hydraulic master cylinder, May be mixed as air bubbles in the hydraulic fluid of, and the pedal and lever operation feel becomes fluffy and has no sense of rigidity.
Since there is a problem that the pedal stroke or the lever stroke is increased and the initial braking is delayed, or the vapor lock phenomenon is likely to occur.
The technique disclosed in Japanese Patent No. 5 has been proposed.

In this hydraulic master cylinder device, a reservoir is rotatably provided on a bar handle by an attachment holder, a locking pin is planted on the bar handle, and a plurality of engaging and disengaging the locking pin are attached to the attachment holder. The mounting groove of the reservoir makes it possible to change the mounting angle of the reservoir, and by connecting the reservoir and the hydraulic master cylinder with a flexible connector, even when the vehicle body is set upright, The fluid surface of the hydraulic fluid is kept at a position higher than the communication hole with the hydraulic master cylinder so that air is not mixed into the hydraulic fluid of the hydraulic master cylinder.

[0004]

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

Therefore, the present invention provides a vehicle hydraulic master cylinder device 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 intended to be applicable to both front wheels and rear wheels regardless of the shape of the steering wheel of the vehicle.

[0006]

According to the above-mentioned object, the first
According to the invention, the hydraulic master cylinder for increasing the hydraulic fluid of the brake and the clutch and the reservoir for replenishing the hydraulic fluid to the hydraulic master cylinder are formed as separate bodies, and the reservoir and the hydraulic master cylinder are formed into a tubular connector. In the hydraulic master cylinder device for a vehicle connected by, the connector is provided so as to project in the width direction of the vehicle body from one of the hydraulic master cylinder and the reservoir, and the other of the hydraulic master cylinder and the reservoir is provided. A connector connection hole is formed in the side wall, the connector connection hole is fitted to the tip of the connector via a bearing, and a hanging portion is attached to the lower portion of the reservoir.

According to the second aspect of the invention, the hydraulic master cylinder for boosting the hydraulic fluid for the brake and the clutch and the reservoir for replenishing the hydraulic fluid to the hydraulic master cylinder are formed as separate bodies, and the reservoir and the hydraulic master are provided. In a vehicle hydraulic master cylinder device in which a cylinder is connected to a tubular connector, the connector is provided so as to project from the hydraulic master cylinder, and at least a tip of the connector is arranged in a width direction of a vehicle body. A connector connection hole is formed in the side wall of the connector, the connector connection hole is fitted to the tip of the connector through a bearing, and a hanging portion is attached to the lower portion of the reservoir.

[0008]

According to these structures, the reservoir can be rotated around the bearing in the front-rear direction of the vehicle body, and the posture of the reservoir is maintained in the vertical direction at any position due to the downward hanging. 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 linder.

[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. Since the first and second embodiments are applied as a hydraulic master cylinder device for a rear wheel disc brake or a front wheel disc brake for an off-road motorcycle or a three-wheel buggy, they can be mounted on a stand-up vehicle body. FIG. 3 showing a front view will be described in common to both embodiments.

Therefore, first of all, 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 pivotably pivoted to a rear portion of a vehicle body frame 5. A rear wheel 7 is suspended from the lower end of the swing arm 6 which is supported. Rear wheel 7 and rear fender 8
A seat rail 9 extending from the vehicle body frame 5 is disposed between and, and a guide stay 10 is fixed to the rear end of the seat rail 9.

A front disc brake 11 is provided on one side of the front wheel 4, and a rear disc brake 12 is provided on the other side of the rear wheel 7. The bar handle 2 has
The hydraulic master cylinder device 50 used for the front wheel disc brake 11 is attached, and the hydraulic master cylinder 51 of the hydraulic master cylinder device 50 and the caliper body 13 of the front wheel disc brake 11 are connected by a brake hose 14. There is. Further, a hydraulic master cylinder device 20 used for the rear wheel disc brake 12 is attached to the rear portion of the vehicle body frame 5, and the hydraulic master cylinder device 2 is attached.
The hydraulic master cylinder 21 of 0 and the caliper body 15 of the rear wheel disc brake 12 are connected by a brake hose 16.

In the vehicle body 1 described above, the rear wheel 7 and the guide stay 10 are grounded when the vehicle body 1 is stored or transported for a long period of time.
As shown above, or by hanging the front wheel 4 on a guide bar (not shown) appropriately provided in the storage place,
Similarly, by standing it upright, the limited storage space can be effectively used.

Next, a first embodiment of the present invention will be described with reference to FIGS. Of these, FIG. 1 is a 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.

The hydraulic master cylinder device 20 used for the rear wheel disc brake 12 has a vertical hydraulic master cylinder 21 for boosting the hydraulic fluid, a separate reservoir 22 for storing the hydraulic fluid for replenishment, and these. Tubular connector 23 to connect
It consists of

The hydraulic master cylinder 21 is attached to a curved portion on the lower rear side of the vehicle body frame 5 with a cylinder body 24 slightly inclined in the longitudinal direction of the vehicle body.
A piston 26 is fluid-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 the brake pedal 27, and has a cup seal 29 on the upper portion.
Is fitted to form a hydraulic chamber 30 from the piston 26 of the cylinder hole 25 to the upper part.

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

A boss portion 24c is projectingly provided on one side wall 24b of the cylinder body 24, and a fitting recess 24 is formed in the boss portion 24c.
d is formed. Further, 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 the present embodiment, the fitting recess 24d, the relief port 36, and The communication port 38 according to the present invention is configured with the supply port 37.

A flange 23a having the same shape as that of the boss portion 24c is provided around one side of the connector 23, and one side of the flange 23a is connected to the hydraulic master linder 21. 23b, and the same flange 23a
From the other side to the long tube portion 23c for mounting the reservoir 22
Is said. In the connector 23, the short tube portion 23b is liquid-tightly fitted into the fitting recess 24d of the boss portion 24c via the sealing material 39, and the flange 23a is screwed with the boss portion 24.
It is fixed to c and protrudes in the vehicle width direction.

The reservoir 22 is provided with a connector connecting hole 42a and a vehicle body fixing piece 42b on a side wall of a storage tank 42 to which a cap 41 is adhered, and a heavy hanging 4 from a bottom wall 42c.
3 is installed vertically. In the reservoir 22, the long tube portion 23c of the connector 23 is inserted into the connector connection hole 42a,
A seal bearing 44 is provided between the connector connection hole 42a and the long tube portion 23c so as to be fluid-tight and rotatable in the front-rear direction of the vehicle body 1. By this connection, the cylinder hole 25 of the hydraulic master cylinder 21 and the reservoir 42 of the reservoir 22 are
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 flow through each other.

The heavy sag 43 is obtained by casting the upper cast piece 43a into the bottom wall 42c when the storage tank 42 is molded.
Is hung vertically below the connector connection hole 42a, and the reservoir 22 is always kept in a vertical posture by the heavy hanging 43. The vehicle body fixing piece 42b protruding from the storage tank 42 corresponds to the vehicle body 1 shown in FIG.
As described above, the screw 22 is fixed to the body frame 5 by a set screw 45 during normal traveling other than standing upright so that the reservoir 22 does not unnecessarily rotate due to traveling vibration or the like.

Rear hydraulic master cylinder 20 of this embodiment
Is configured as described above, and the brake pedal 27
When is depressed, 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 increased in pressure. Hydraulic chamber 30
The hydraulic fluid whose pressure has been increased by is sent from the union bolt 35 of the union hole 32 to the caliper body 15 of the rear wheel disc brake 12 through the brake hose 16 and brakes the disc rotor 46 that rotates integrally with the rear wheel 7.

When the vehicle body 1 is set upright for storage, transportation, etc., the set screw 45 of the vehicle body fixing piece 42b is removed in advance to make the reservoir 22 rotatable. Next, when the front side of the vehicle body 1 is pulled up, the reservoir 22
However, while maintaining a vertical state by the lower hanging portion 43, the relative rotation is made around the connector 23 through the seal bearing 44 in the front direction of the vehicle body, and the rear wheel 7 and the guide stay 10 are grounded to contact the vehicle body 1. In a state in which the hydraulic master cylinder 21 and the reservoir 22 are placed upright, the imaginary line in FIG.
Deviate as shown in.

In this embodiment, the reservoir 22 is
The seal bearing 44 enables relative rotation around the connector 23 in the front direction of the vehicle body, and the lower hanging portion 43 can maintain the vertical state even when the vehicle body 1 is being pulled up or placed upright. Thus, the liquid level of the hydraulic fluid in the storage tank 42 can be always arranged at a position higher than the communication hole 38, so that the 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 excellently started, and the vapor lock phenomenon is less likely to occur.

Further, in this embodiment, when the vehicle body 1 is not placed upright, the vehicle body fixing piece 42b of the storage tank 42 is attached to the vehicle body frame 5
By screwing the reservoir 22, the reservoir 22 can be prevented from accidentally rotating due to traveling vibration of the vehicle body 1 or the like.

In the case where the entire connector is arranged in the width direction of the vehicle body as in this embodiment, the connector is provided so as to project 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.
It will be described with reference to FIG. Front wheel disc brake 1
The hydraulic master cylinder device 50 used for No. 1 has a hydraulic master cylinder 51 attached to the front part of the bar handle 2 together with a brake lever 54, a separate reservoir 52 for storing replenishing hydraulic fluid, and a tubular structure connecting them. Connector 5
It consists of 3.

The hydraulic master cylinder 51 is formed in a cylinder body 55 having a vehicle body mounting bracket 55a and lever mounting arms 55b and 55b with a cylinder hole 56 opened on the brake lever 54 side.
The piston 57, the cup seal 58, the hydraulic chamber 59, and the return spring 60 are provided in substantially the same manner as in the first embodiment.

The brake lever 54 has a lever mounting arm 5
A pivot 61 is rotatably supported between 5b and 55b, and when the brake lever 54 is gripped and operated,
The working arm 54a facing the rear end of the piston 57 pushes the piston 57 toward the hydraulic pressure chamber 59 to move the hydraulic pressure chamber 59a.
Pressurize the hydraulic fluid of.

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 the 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 on the upper wall 55d of the cylinder body 55 so as to communicate with the cylinder hole 56, and a boss portion that surrounds the relief port 65 and the supply port 66 from the upper wall 55d and projects upward. A fitting recess 55f is formed in 55e, and the ports 65, 66 and the fitting recess 55f form a communication hole 67 between the hydraulic master cylinder 51 and the reservoir 52.

The connector 53 is a hydraulic master linda 5
1 has a shape in which a short tube portion 53a connected to 1 and a long tube portion 53b to which the reservoir 52 is attached are connected in an L shape.
The short pipe portion 53a is liquid-tightly fitted into the fitting recess 55f of the boss portion 55e via the sealing material 68, and the long pipe portion 53b is projected to one side portion of the short pipe portion 53a while facing the width direction of the vehicle body. Fixing the flange 53c to the boss 55e with the screw 69,
It is attached to the hydraulic master linda 51.

The reservoir 52 is provided with a connector connection hole 70a and a vehicle body fixing piece 70b on a side wall of a storage tank 70, and a casting piece 71a is provided at a lower portion of the storage tank 70 with a bottom wall 70c.
A heavy droop 71 cast into is hung. The 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 provided 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-described reservoir 52 is held in a vertical posture by the hanging body 71. However, during normal running except when the vehicle body 1 is placed upright, the vehicle body fixing piece 70b is mounted on the upper surface of the vehicle body mounting bracket 55a. It is fixed by a set screw 73 to prevent undesired rotation.

In both of the above-mentioned embodiments, the reservoir can be fixed to the vehicle body side by the vehicle body fixing piece. However, even if the conventional fixed type reservoir tilts integrally with the vehicle body, the air to the cylinder hole is The present invention does not cause any trouble in normal traveling even if the reservoir is not fixed, in the same manner that the biting of No. 1 and the leakage of liquid do not occur. In particular, in trial running such as climbing up and down a steep cliff, it is possible to keep the reservoir in the vertical direction while rotating it according to the tilted state of the vehicle body, so that ripples of the hydraulic fluid in the reservoir and communication holes may occur. The exposure from the liquid surface can be suppressed as much as possible. Further, when the reservoir is not fixed by the vehicle body fixing piece, it becomes unnecessary to attach and detach the set screw of the vehicle body fixing piece.

[0034]

As described above, according to the configuration of the present invention, even when the vehicle body is placed upright, the level of the hydraulic fluid in the reservoir is set higher than the communication hole with the hydraulic master cylinder. By holding the hydraulic master cylinder device, the hydraulic master cylinder device in which air is not mixed into the hydraulic fluid of the hydraulic master cylinder can be applied to both the clutch and the front / rear wheel brakes. Also, because no special parts or components are required,
It has excellent versatility and economy, and can be applied to front wheel brakes and clutches regardless of the handle shape.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

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

FIG. 3 is a front view showing a state in which a vehicle to which the first embodiment and the second embodiment of the present invention are applied is placed upright.

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

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

[Explanation 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 ... Front wheel disc brake 11 caliper body 14 ... Front wheel disc Brake hose 15 of brake 11 ... Caliper body of rear wheel disc brake 12 16 ... Brake hose of rear wheel disc brake 20 ... Hydraulic master cylinder device 21 used for rear wheel disc brake 12 ... Hydraulic pressure of hydraulic master cylinder device 20 Master cylinder 22 ... Reservoir of hydraulic master cylinder device 20 ... Connector 23a of hydraulic master cylinder device 20 ... Flange of connector 23 23b ... Short pipe part 23c connected to hydraulic master linder 21 ... Long pipe to which reservoir 22 is attached Part 24 ... Hydraulic mass Cylinder body 24c of cylinder 21 ... Boss portion 24d ... Fitting recess formed in boss portion 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 consisting of fitting recess 24d, relief port 36, and supply port 37 42 ... Reservoir 22 storage tank 42a ... Connector connection hole 42b formed on side wall of storage tank 42 ... Vehicle body fixing piece 43 projecting from the side wall of the storage tank 42 ... Heavy drop 44 hanging from the bottom wall 42c of the reservoir 22 ... Seal bearing 50 corresponding to the bearing of the present invention 50 ... Hydraulic master used for the front wheel disc brake 11 Cylinder device 51 ... Hydraulic master cylinder of hydraulic master cylinder device 50 2 ... Reservoir 53 of hydraulic master cylinder device 50 ... Connector 53a of hydraulic master cylinder device 50 ... Short pipe part 53b connected to hydraulic master cylinder 51 ... Long pipe part 54 for mounting reservoir 52 ... Brake lever 54a ... Brake Working arm 55 of the lever 54 ... Cylinder body 55a of the hydraulic master cylinder 51 ... Car body mounting bracket 55e formed on the cylinder body 55 ... Boss portion 55f ... Fitting recess 56 ... Cylinder hole 57 of the cylinder body 55 ... Piston 58 ... Cup seal 59 ... Hydraulic chamber 62 ... Union hole 65 ... Relief port 66 ... Supply port 67 ... Communication hole consisting of relief port 65, supply port 66, and fitting recess 55f 70 ... Reservoir 52 reservoir 70a ... Reservoir 70 side wall Connector connection hole 70b formed in the storage tank 70 Body fixing piece 70c protruding from the side wall of the storage tank 70 ... bottom wall 71 of the storage tank 70 ... heavy drip 72 suspended from the bottom wall 70c of the storage tank 70 ... seal bearing corresponding to the bearing of the present invention

Claims (2)

[Claims] 1. A hydraulic master cylinder for boosting the hydraulic fluid of a brake or a clutch and a reservoir for replenishing the hydraulic fluid to the hydraulic master cylinder are separately formed, and the reservoir and the hydraulic master cylinder are tubular. In the hydraulic master cylinder device for a vehicle to be connected by the connector, the connector is provided so as to project from one of the hydraulic master cylinder and the reservoir in the width direction of the vehicle body, and one of the hydraulic master cylinder and the reservoir is provided. A vehicle hydraulic pressure characterized in that a connector connection hole is formed in the other side wall, the connector connection hole is fitted to the tip of the connector via a bearing, and a heavy drip is attached to the lower portion of the reservoir. Master cylinder device. 2. A hydraulic master cylinder for boosting the hydraulic fluid of a brake or a clutch and a reservoir for replenishing the hydraulic master cylinder with hydraulic fluid are separately formed, and the reservoir and the hydraulic master cylinder are tubular. In the hydraulic master cylinder device for a vehicle connected with the connector, the connector is provided so as to project from the hydraulic master cylinder, and at least the tip of the connector is arranged in the width direction of the vehicle body, and the connector is provided on the 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 the tip of the connector via a bearing, and a weight hanging is attached to a lower portion of the reservoir.