JP3329957B2 - Rear wheel brake pressure control device for motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing provided with a hydraulic pressure shut-off means capable of shutting off a connection between a master cylinder and a rear wheel brake, and a pressure reducing means capable of increasing a capacity of a pressure reducing chamber communicating with a rear wheel brake. The present invention relates to a rear wheel brake pressure control device for a motorcycle.

[0002]

2. Description of the Related Art Conventionally, such an apparatus is disclosed in, for example,
It is already known from, for example, JP-A-71951.

[0003]

In such a rear wheel brake pressure control system, when braking the front and rear wheels of a motorcycle, the distribution ratio of the braking force of the front and rear wheels is made closer to an ideal distribution ratio. However, in the above-described conventional apparatus, a part of the components of the hydraulic pressure interrupting unit and a part of the components of the pressure reducing unit are housed in the housing holes provided in the housing with different shapes, respectively. Further, the hydraulic pressure passage provided in the housing through the hydraulic pressure cutoff means and the pressure reduction means is complicated. For this reason, the assembling operation is complicated, and the number of processing steps for the housing is inevitably increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rear wheel brake pressure control device for a motorcycle which facilitates an assembling operation and reduces the number of processing steps for a housing. I do.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a hydraulic pressure shut-off means capable of shutting off a space between a master cylinder and a rear wheel brake, and an increase in the volume of a pressure reducing chamber communicating with the rear wheel brake. A rear-wheel brake pressure control device for a motorcycle, comprising: a large-diameter hole having one end opened; and a medium-diameter having one end coaxially connected to the other end of the large-diameter hole. A pair of storage holes having the same shape and having axes parallel to each other, and each having a small-diameter hole portion which is coaxially connected to the other end of the hole portion, and the middle-diameter hole portion via a step portion, and the other end is closed by an end wall, A master cylinder side connection path connected to the master cylinder and connected to the middle part of both large diameter holes and a rear wheel brake side connection path connected to the rear wheel brake and connected to both small diameter holes are provided. Blocking means for the step A cup-shaped sheet member that abuts and is fitted into the other end of the medium-diameter hole portion, and an input chamber that communicates with the master cylinder-side connection path are formed between the sheet member and a liquid is formed at one end side of the large-diameter hole portion. An end wall member that is tightly fitted and fixed, and an annular valve portion that can be brought into contact with the seat member from the small-diameter hole side, are movably inserted into the small-diameter hole portion, and are connected to the rear wheel brake side. A small-diameter piston portion having an output chamber communicating with the inner surface of the small-diameter hole portion, and a large-diameter piston portion having a diameter larger than that of the small-diameter piston portion and fitted to the end wall member in a liquid-tight and slidable manner. A piston which is coaxially connected via a connecting shaft portion penetrating the seat member with a smaller diameter than those piston portions, and a piston which exerts a spring force in a direction in which the valve portion separates from the seat member, and With both valve springs provided between the end wall members The pressure reducing means forms an annular chamber communicating with the master cylinder side connection passage between the inner surface of the large-diameter hole and the large-diameter hole and the medium-diameter hole. A large-diameter portion and a small-diameter portion slidably fitted to each other coaxially connected to each other, and a decompression piston formed between the end wall of the small-diameter hole portion and a decompression chamber communicating with the rear-wheel brake-side connection path; A receiving member fitted and fixed to one end of the large-diameter hole portion, and a decompression spring provided between the decompression piston and the receiving member by exerting a spring force on the side for reducing the volume of the decompression chamber. It is characterized by being stored in the other of the storage holes.

[0006]

According to the above construction, a pair of parallel storage holes, a master cylinder side connection path and a rear wheel brake side connection path, which are opened in the same direction, may be formed in the housing. Since the path may be provided in the housing so as to communicate with both large-diameter holes, the housing can be easily pierced, and the components of the hydraulic pressure interrupting means are stored in one of the storage holes, and the pressure is reduced. Since the components of the means may be housed in the other of the two storage holes in the same direction as the components of the hydraulic pressure interrupting means, the mounting direction of the hydraulic pressure interrupting means and the pressure reducing means can be easily set to be the same. Become.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment of the present invention. FIG. 1 is a simplified plan view of a motorcycle provided with a braking device, and FIG. 2 is a hydraulic circuit diagram of the braking device. 3 is a vertical cross-sectional view of the rear wheel brake pressure control device, FIG. 4 is a vertical cross-sectional view of the rear wheel brake pressure control device in a state where the storage positions of the hydraulic pressure shutoff means and the pressure reducing means are different from those of FIG. FIG. 5 is a brake pressure characteristic diagram by the rear wheel brake pressure control device.

[0009] First, in FIG. 1 and FIG. 2, the front wheel brake B _F is the front wheel W _F in the motorcycle V is, the rear wheel W _R
The rear wheel brake B _R is mounted on. Also on the right end portion of the steering wheel 1, the first master cylinder M ₁ is provided for outputting a hydraulic pressure corresponding to the operation of the brake lever 2, the left end portion of the steering wheel 2, the operation of the brake lever 3 the second master cylinder M ₂ for outputting a corresponding liquid pressure is provided. When the brake lever 2 is operated alone without operating the brake lever 3, the first master cylinder M ₁
The front wheel brake B _F hydraulically output is actuated brakes, also when the single operation of the brake lever 3 in a state which does not operate the brake lever 2 and the brake operates in conjunction front wheel brake B _F and the rear wheel brake B _R from .

[0010] The first master cylinder M ₁ is directly connected to the front wheel brake B _F. Also, the second master cylinder M
₂ is connected to the rear wheel brake B _R via the rear wheel braking pressure control device 4 is connected directly to the front wheel brake B _F.

In FIG. 3, a rear wheel brake pressure control device 4
Includes a second master cylinder M ₂ and the rear wheel hydraulic blocking means 8 capable of blocking between brake B _R, a and the rear wheel brake B _R volume of the decompression chamber 35 communicating with the possible increase a pressure reducing means 9 housing 10 It is provided.

The housing 10 has a pair of storage holes 11 ₁ and 11 ₂ having the same shape and arranged in parallel with each other, and is connected to the second master cylinder M _2.
A pair of rear wheels connected to the master cylinder side connection path 12 communicated with the intermediate portion of 11 ₁ and 11 ₂ and the rear wheel brake _BR and individually connected to the inner ends of both storage holes 11 ₁ and 11 _2. Brake-side connection paths 13 ₁ and 13 ₂ are provided.

The two housing holes 11 ₁ and 11 ₂ are provided in the housing 1.
0, a large-diameter hole 14 having one end open, a medium-diameter hole 15 having one end coaxially connected to the other end of the large-diameter hole 14, and a step 16 at the other end of the medium-diameter hole 15. They are formed in the same shape, each having a small-diameter hole portion 18 which is coaxially connected via the other end and the other end of which is closed by an end wall 17, and is formed in the housing 10 with their axes parallel to each other. The master cylinder side connection path 12 has an axis orthogonal to the axis of the two storage holes 11 ₁ and 11 _2.
It is formed in the housing 10 so as to allowed to open the inner end to the inner surface of the large-diameter portion 14 at the other receiving hole 11 ₂ with crossing the large diameter portion 14 in 1 _1. Furthermore wheel brake side connecting path 13 ₁ after the other is if one of the housing holes 11 ₁ has an axis parallel to the axis, one of the housing holes 11 ₁ of the inner end or connecting the inner end to the small-diameter hole portion 18 is bored in the housing 10 so as to, wheel brake side connecting path 13 ₂ after the other has the other housing hole 11 ₂ of axis parallel to the axis, the inner end of the other housing hole 11 ₂ i.e. Small hole 18
Are formed in the housing 10 such that the inner ends thereof are connected to each other. In addition, the two rear wheel brake side connection paths 13 ₁ and 13 ₂ are communicated with each other outside the housing 10.

The hydraulic pressure interrupting means 8 includes a cup-shaped sheet member 20, an end wall member 21, a piston 22
And the valve spring 23 are housed in _{one of} the housing holes 11 ₁ and 11 ₂ (11 _{1 in} FIG. 3).

The sheet member 20 has an annular plate portion 20a which is brought into contact with the step portion 16 so that an inner peripheral edge portion of the sheet member 20 protrudes inward from the step portion 16, and a medium-diameter hole connected to the outer periphery of the annular plate portion 20a. A lip portion 20b which resiliently contacts the inner surface of the portion 15; and a plurality of protrusion portions 20c which are provided on the opposite side of the step portion 16 from the annular plate portion 20a and are arranged at intervals in the circumferential direction.
Are formed in an approximately L-shaped vertical section by an elastic material,
It is fitted into the end of the middle diameter hole 15 on the side of the step 16.

The end wall member 21 is formed in a cylindrical shape with a bottom having an open inner end side. The end wall member 21 has an annular seal member 24 on the outer periphery which comes into contact with the inner surface of the large diameter hole portion 14 and has a large diameter. Hole 1
4 is fitted to one end side, that is, the outer end side, and the inner surface of the large-diameter hole portion 14 abuts on the outer peripheral edge of the end wall member 21 to prevent the end wall member 21 from separating from the large-diameter hole portion 14. A retaining ring 25 is fitted. A spring force is applied to the end wall member 21 in the axially outward direction of the large-diameter hole portion 14 by the valve spring 23, and the end wall member 21 is pressed against the retaining ring 25 by the spring force. The wall member 21 is substantially fixed at one end side in the large-diameter hole portion 14. In the large-diameter hole portion 14 and the medium-diameter hole portion 15, an input chamber 26 is formed between the sheet member 20 and the end wall member 21 so as to communicate with the master cylinder side connection path 12.

The piston 22 includes a small-diameter piston portion 22a movably inserted into the small-diameter hole portion 18, a large-diameter piston portion 22b having a diameter larger than the small-diameter piston portion 22a, and a piston 22a, 22b. And a connecting shaft portion 22c for connecting the two piston portions 22a, 22b coaxially and integrally with each other.

The small-diameter piston portion 22a has an output chamber 27 communicating with the rear-wheel brake-side connecting passages 13 ₁ and 13 _2.
8 and is inserted into the small-diameter hole portion 18 so as to be movable in the axial direction.
a, the sheet member 2
An annular valve portion 28 for projecting from the side of the small-diameter hole portion 18 to shut off the space between the input chamber 26 and the output chamber 27 is provided in a protruding manner.

The large-diameter piston portion 22b is slidably fitted to the end wall member 21. The end wall member 21 has an annular seal member 29 that is slidably contacted with the outer surface of the large-diameter piston portion 22b. Be attached. Therefore, the large-diameter piston 2
2b is slidably and liquid-tightly fitted to the end wall member 21.

Large-diameter piston portion 22 of piston 22
A flange 22d that protrudes outward in the radial direction is provided at an end of the connection shaft 22b on the side of b, and a valve spring 23 is contracted between the flange 22d and the end wall member 21.

The pressure reducing means 9, the vacuum piston 31 which is a component receiving member 32 and the pressure spring 33 is comprised is housed in two accommodation holes 11 _1, 11 ₂ in the other (Fig. 3, 11 _2).

In the pressure reducing piston 31, a large-diameter portion 31a slidably fitted in the large-diameter hole portion 14 and a small-diameter portion 31b slidably fitted in the middle-diameter portion 15 are coaxially connected. An annular chamber 34 communicating with the master cylinder side connection passage 12 is formed between the pressure reducing piston 31 and the inner surface of the large-diameter hole portion 14. A decompression chamber 35 is formed between the inner end of the decompression piston 31 and the end wall 17 of the small-diameter hole portion 18 and communicates with the rear-wheel brake-side connection paths 13 ₁ and 13 ₂ . An annular chamber 3 is provided around the outer periphery of the large diameter portion 31a and the small diameter portion 31b of the pressure reducing piston 31.
4 to seal both sides of the large-diameter hole 14 and the medium-diameter hole 1
The annular seal members 36 and 37 that are in sliding contact with the inner surface of No. 5 are mounted.

The receiving member 32 is formed in a disk shape and is fitted to one end side, that is, the outer end side of the large-diameter hole portion 14. A retaining ring 38 is fitted in contact with the peripheral edge of the receiving member 32 to prevent the receiving member 32 from being detached from the large-diameter hole portion 14. Thus, the decompression piston 3
A pressure reducing spring 33 for urging the pressure reducing piston 31 toward the side of reducing the volume of the pressure reducing chamber 35 is contracted between the first member 1 and the receiving member 32. When the spring force directed outward in the direction acts on the receiving member 32 and is pressed against the retaining ring 38, the receiving member 32 is substantially fixed at one end side in the large-diameter hole portion 14.

The open ends of the two storage holes 11 ₁ and 11 ₂ , that is, the outer ends of the large-diameter holes 14 and 14, are connected to the large-diameter holes 14 and 14.
It is closed by the cap 39 _1, 39 ₂ screwed to the outer end.

With such a rear wheel brake pressure control device 4,
Is a pair of storage holes 11 provided in the housing 10.₁,
11_TwoIn any case, the components of the hydraulic pressure shut-off means 8
Sheet member 20, end wall member 21, piston 22, and
The valve spring 23 can be housed, and
The decompression piston 31, the receiving member 32 and the
The pressure spring 33 can be housed, and is therefore shown in FIG.
As shown in FIG. ₁Side constitutes the hydraulic pressure cutoff means 8
And the other storage hole 11_TwoSide constitutes the decompression means 9
4, and as shown in FIG.₁
Side constitutes the pressure reducing means 9 and the other receiving hole 11_Two
The hydraulic pressure cutoff means 8 may be configured on the side.

The control characteristics of the rear wheel brake pressure by the rear wheel brake pressure control device 4 are as shown in FIG. That is, in the piston 22 of the hydraulic pressure interrupting means 8, since the large-diameter piston portion 22b which is slidably fitted to the end wall member 21 in a liquid-tight manner has a larger diameter than the small-diameter piston portion 22a, the second master the output hydraulic pressure of the cylinder M ₂ is provided a liquid pressure facing the valve spring 23 to the piston 22, in a relatively low state (brake pressure of the front wheel brake B _F) second master output hydraulic pressure of the cylinder M _2, Piston 2
2 causes the valve portion 28 to move to the seat member 2 by the spring force of the valve spring 23.
It has moved to a position where it is separated from zero, and the input chamber 26 and the output chamber 27 are in communication. The brake fluid pressure of the rear wheel brake B _R therefore also continue to increase in response to the brake fluid pressure increase of the front wheel brake B _F.

The output hydraulic pressure of the second master cylinder M ₂ increases, and the hydraulic pressure that overcomes the spring force of the valve spring 23 is applied to the piston 2.
When the pressure reaches the first set pressure P _A , which is the hydraulic pressure applied to the valve 2, the piston 22 moves so as to abut the valve portion 28 against the seat member 20 against the spring force of the valve spring 23, and shuts off the hydraulic pressure. means 8 becomes in a state of being cut off between the input chamber 26 and output chamber 27, the second master output hydraulic fluid pressure blocking means 8 even pressure further increases in cylinder M ₂ is maintained at the hydraulic pressure cut-off state.

However, in the decompression means 9, the second cell
Ta cylinder M_TwoThe hydraulic pressure in the annular chamber 34 communicating with the
The hydraulic pressure opposing to the spring force of No. 3 is applied to the pressure reducing piston 31.
And the first set pressure P_ASecond set pressure P larger than
_BUp to the second master cylinder M _TwoOutput hydraulic pressure increases
And the pressure reducing piston 31 resists the spring force of the pressure reducing spring 33.
It moves to the side which increases the volume of the decompression chamber 35, and
Wheel brake B_RBrake pressure decreases.

Therefore, according to the rear wheel brake pressure control device 4, it is possible to obtain the rear wheel brake pressure approximate to the ideal distribution characteristic for the front wheel brake pressure, as shown by the point 0-ABC in FIG. Becomes

Next, the operation of this embodiment will be described. The housing 10 of the rear wheel brake pressure control device 4
A pair of parallel storage holes 11 ₁ and 11 ₂ opened in the same direction and having the same shape, the master cylinder side connection path 12 and the rear wheel brake side connection paths 13 ₁ and 13 ₂ are connected to the master cylinder side. Since the path 12 may be provided in the housing 10 so as to communicate with both large-diameter holes 14, 14,
The configuration of the hydraulic passage provided in the housing 10 can be simplified, and the drilling of the housing 10 is facilitated.

Further components of a hydraulic shut-off means 8 is accommodated in one of the two housing Naruyoshi 11 _1, 12 _2, the components of the pressure reducing means 9 the hydraulic blocking the other of the two housing holes 11 _1, 11 ₂ Since it is only necessary to be stored from the same direction as the components of the means 8,
With the same direction of assembly of the hydraulic shut-off means 8 and the pressure reducing means 9, the assembling work as can accommodate either housing holes 11 _1, 11 ₂ can be facilitated.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, the rear-wheel brake-side connection path is formed in the housing 10 so as to be connected to the small-diameter holes 18, 18 as a single connection having an axis orthogonal to the axes of the two storage holes 11 ₁ , 11 _2. It is also possible.

[0034]

As described above, according to the present invention, a pair of storage holes having the same shape and the axes parallel to each other are formed in the housing.
A master cylinder side connection path connected to the master cylinder and connected to the middle part of both large diameter holes and a rear wheel brake side connection path connected to the rear wheel brake and connected to both small diameter holes are provided. Since the shutoff means and the decompression means are provided with components which function even when housed in any of the storage holes, the operation of piercing the housing is simplified and the hydraulic pressure cutoff means and the decompression means are assembled. Work can be facilitated and work steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a simplified plan view of a motorcycle including a braking device.

FIG. 2 is a hydraulic circuit diagram of the braking device.

FIG. 3 is a longitudinal sectional view of a rear wheel brake pressure control device.

FIG. 4 shows the storage positions of the hydraulic pressure interrupting means and the pressure reducing means in FIG.
FIG. 4 is a longitudinal sectional view of the rear wheel brake pressure control device in a state different from FIG.

FIG. 5 is a brake pressure characteristic diagram by a rear wheel brake pressure control device.

[Explanation of symbols]

4 Rear wheel brake pressure control device 8 Liquid pressure shut-off means 9 Pressure reducing means 10 Housing 11 ₁ and 11 ₂ Storage hole 12 Connection path on master cylinder side 13 ₁ , 13 ₂ ··· Rear wheel brake side connection path 14 ··· Large diameter hole 15 ··· Middle diameter hole 16 ··· Stepped portion 17 ··· End wall 18 ··· Small diameter hole 20.・ Sheet member 21 ・ ・ ・ End wall member 22 ・ ・ ・ Piston 22a ・ ・ ・ Small diameter piston part 22b ・ ・ ・ Large diameter piston part 22c ・ ・ ・ Connection shaft part 23 ・ ・ ・ Valve spring 26 ・ ・ ・ Input chamber 27 ... output chamber 28 ... valve part 31 ... decompression piston 31a ... large diameter part 31b ... small diameter part 32 ... receiving member 33 ... decompression spring 34 ... annular chamber 35 ... decompression chamber B _R · · · rear wheel brake M ₂ · · · master cylinder

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60T 8/26

Claims (1)

(57) [Claims] And 1. A master cylinder (M ₂₎ and the rear wheel brake (B _R) hydraulic blocking means between can block (8), decompression chamber leading to the rear wheel brake (B _R) of the volume (35) In a motorcycle rear wheel brake pressure control device in which a pressure reducing means (9) that can be increased is provided in a housing (10), a large-diameter hole (14) having one end opened in the housing (10) is provided. A medium-diameter hole portion (15) having one end coaxially connected to the other end of the radial hole portion (14), and a coaxially connected other end of the medium-diameter hole portion (15) via a step (16). A pair of storage holes (1) having the same shape and having axes parallel to each other, each having a small diameter hole (18) closed by the end wall (17).
11 ₁ , 11 ₂ ), the master cylinder side connection path (12) connected to the master cylinder (M ₂ ) and connected to the middle part of both large diameter holes (14), and the rear wheel brake ( _BR ). A rear wheel brake side connection path (13 ₁ , 13 ₂ ) connected to the two small diameter holes (18) is provided, and the hydraulic pressure cut-off means (8) comes into contact with the step (16) to form a middle part. Diameter hole (1
5) A cup-shaped sheet member (20) fitted into the other end of (5).
And an input chamber (26) communicating with the master cylinder side connection path (12) is formed between the seat member (20) and the input chamber (26) is liquid-tightly fitted and fixed to one end of the large-diameter hole (14). The small diameter hole (1) is formed in the end wall member (21) and the sheet member (20).
8) can contact the side annular valve portion (28) and has a small diameter bore portion (18) rear wheel brake side connecting path while being movably inserted into the (13 _1, 13 ₂₎ in communication with the output Room (2
7) and a small-diameter piston portion (22a) formed between the small-diameter hole portion (18) and the inner surface of the small-diameter hole portion (18).
The large-diameter piston portion (22b), which is larger in diameter than the piston portions (22a, 22b) and which is fitted to the end wall member (21) in a liquid-tight and slidable manner, has a smaller diameter than the piston portions (22a, 22b). The piston (22), which is coaxially connected via a connecting shaft portion (22c) penetrating the (20), and the valve portion (28) exert a spring force in a direction away from the seat member (20). Piston (22) and end wall member (21)
A valve spring (23) provided between the two storage holes (1).
1 ₁ , 11 ₂ ), and the pressure reducing means (9) is provided between the annular chamber (34) leading to the master cylinder side connection path (12) and the inner surface of the large diameter hole (14). A large-diameter portion (31a) and a small-diameter portion (31b) formed and slidably fitted to the large-diameter hole portion (14) and the medium-diameter hole portion (15), respectively, are coaxially connected. a pressure reducing piston formed (31) between the end wall (17) of the rear wheel brake side connecting passage (13 _1, 13 ₂₎ communicating the decompression chamber (35) the small-diameter hole portion (18) both made Te, large A receiving member (32) fitted and fixed to one end side of the radial hole (14) and a decompression piston (31) and a receiving member ( 32) and a pressure reducing spring (33) provided between the two receiving holes (11 ₁ , 1).
A rear wheel brake pressure control device for a motorcycle, wherein the rear wheel brake pressure control device is housed in the other of ₁₂ ).