Brake hydraulic control device

Abstract

To inhibit occurrence of resonance phenomenon of a brake fluid pressure unit.SOLUTION: A brake fluid pressure control device (80) includes: a brake fluid pressure unit (1) which controls a fluid pressure of brake fluid supplied to a brake part; and a support structure (40) for attaching the brake fluid pressure unit (1) to a vehicle. The support structure (40) has: a fixing member (49); a bracket (41); a first vibration absorption member (51); and a second vibration absorption member (52). The first vibration absorption member (51) is fixed to an opening (41d) formed at the bracket (41). The fixing member (49) penetrates through the first vibration absorption member (51) and the second vibration absorption member (52) and one end part thereof is press-fitted in the brake fluid pressure unit (1).SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a brake hydraulic control device.

Background Art

[0002] Conventionally, in a braking device of a vehicle such as a motorcycle (motorcycle or three-wheeled vehicle), when a vehicle rider operates a brake lever, the pressure of the working fluid in a brake fluid circuit filled with brake fluid increases, and braking force can be generated on the wheels. Further, in order to improve the safety of the braking operation, it is known to employ an ABS (Antilock Brake System) unit as a brake hydraulic unit that adjusts the braking force. The brake hydraulic unit can increase or decrease the pressure of the working fluid in the brake fluid circuit and adjust the braking force generated on the wheels. Such a brake hydraulic unit is attached to a bracket provided on the vehicle side by a support structure via an anti-vibration rubber or the like (see Patent Document 1, etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When vibrations of a frequency close to the natural frequency of the vibration system of the brake hydraulic unit are applied from the vehicle side, a resonance phenomenon occurs and the brake hydraulic unit vibrates greatly. In the support structure of the conventional brake hydraulic unit, an anti-vibration rubber of a single hardness is interposed between the brake hydraulic unit and the bracket to support the brake hydraulic unit. Then, in order to suppress the occurrence of resonance phenomenon, it was necessary to make design changes to the vibration isolation rubber of a single hardness, or to make design changes to the structure of the brake hydraulic unit and its support structure.

[0005] The present invention has been made in view of the above problems, and an object thereof is to obtain a brake hydraulic control device provided with a support structure for a brake hydraulic unit that can suppress the occurrence of a resonance phenomenon in the brake hydraulic unit by adjusting the frequency of vibration applied from the vehicle side so as not to overlap with the natural frequency of the vibration system of the brake hydraulic unit.

Means for Solving the Problems

[0006] In a brake hydraulic control device according to the present invention, in a brake hydraulic control device (80) including a brake hydraulic unit (1) that controls the hydraulic pressure of brake fluid supplied to a braking unit and a support structure (40) for attaching the brake hydraulic unit (1) to a vehicle, the support structure (40) includes a fixing member (49), a bracket (41), a first vibration absorbing member (51), and a second vibration absorbing member (52). The first vibration absorbing member (51) is fixed to an opening (41d) formed in the bracket (41). The fixing member (49) penetrates through the first vibration absorbing member (51) and the second vibration absorbing member (52), and one end portion is press-fitted into the brake hydraulic unit (1). On the side of the second vibration absorbing member (52) facing the brake hydraulic unit (1), the surface abuts against the bracket (41), and the surface on the side opposite to the surface abutting against the bracket (41) abuts against a lower disk portion (49d) formed at the other end portion of the fixing member (49). The edge portion of the opening (41d) has a bent portion (41e) standing upright toward the brake hydraulic unit (1) side, and the bent portion (41e) is fitted into a groove portion formed in the first vibration absorbing member (51).

Effects of the Invention

[0007] According to the present invention, vibration absorption members with different hardnesses are freely combined so as to avoid the natural frequency of the vibration system of the brake hydraulic unit, and the dynamic spring constant of the support structure is easily adjusted to suppress the occurrence of the resonance phenomenon of the brake hydraulic unit.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0009] Hereinafter, the brake hydraulic control device according to the present invention will be described with reference to the drawings. Note that the brake hydraulic control device according to the present invention may be used in vehicles other than motorcycles (for example, four-wheel automobiles, trucks, etc.). Further, the configurations, operations, etc. described below are examples, and the brake hydraulic control device according to the present invention is not limited to such configurations, operations, etc. For example, the brake hydraulic unit according to the present invention may not have a pump device. For example, the brake hydraulic unit according to the present invention may perform operations other than those as an ABS. Also, in each figure, the illustration of detailed parts is appropriately simplified or omitted. Also, duplicate explanations are appropriately simplified or omitted.

[0010] <Overall Configuration of Brake Hydraulic Control System 100> First, the overall configuration of the brake hydraulic control system 100 will be described. FIG. 1 is a schematic configuration diagram of a brake hydraulic control system 100 including a brake hydraulic unit 1 according to the present embodiment.

[0011] The brake hydraulic control system 100 is mounted on a vehicle such as a motorcycle, for example, and includes a brake hydraulic unit 1 that changes the braking force of the wheels of the motorcycle. In the present embodiment, the case where the brake hydraulic control system 100 is mounted on a motorcycle will be described as an example. The motorcycle includes a front wheel 20 and a rear wheel 30, and a handle lever 24 and a foot pedal 34 that are operated by a user or the like who drives the motorcycle. When the handle lever 24 is operated, the braking force of the front wheel 20 changes, and when the foot pedal 34 is operated, the braking force of the rear wheel 30 changes.

[0012] The brake hydraulic control system 100 includes a front wheel hydraulic circuit C1 through which brake fluid used to generate the braking force of the front wheel 20 flows, and a rear wheel hydraulic circuit C2 through which brake fluid used to generate the braking force of the rear wheel 30 flows. The front wheel hydraulic circuit C1 and the rear wheel hydraulic circuit C2 include an internal flow path 4 in the brake hydraulic unit 1 described later. Also, various brake oils can be used as the brake fluid.

[0013] The brake hydraulic control system 100 has the following configuration as a mechanism for generating braking force on the front wheels 20. That is, the brake hydraulic control system 100 includes a front brake pad 21 attached to the front wheels 20, a front wheel cylinder 22 in which a front brake piston (not shown) for operating the front brake pad 21 is slidably provided, and a brake fluid pipe 23 connected to the front wheel cylinder 22. The front brake pad 21 is provided so as to sandwich a floating rotor (not shown) that rotates with the front wheels 20. When the front brake pad 21 is pushed by the front brake piston in the front wheel cylinder 22, it contacts the floating rotor and a frictional force is generated, and a braking force is generated on the front wheels 20 that rotate with the floating rotor.

[0014] The brake hydraulic control system 100 includes a first master cylinder 25 attached to the handle lever 24, a first reservoir 26 for storing brake fluid, and a brake fluid pipe 27 connected to the first master cylinder 25. A master cylinder piston (not shown) is slidably provided in the first master cylinder 25. When the handle lever 24 is operated, the master cylinder piston in the first master cylinder 25 moves. Since the pressure of the brake fluid applied to the front brake piston changes according to the position of the master cylinder piston, the force with which the front brake pad 21 sandwiches the floating rotor changes, and the braking force of the front wheels 20 also changes.

[0015] The brake hydraulic control system 100 has the following configuration as a mechanism for generating braking force on the rear wheels 30. That is, the brake hydraulic control system 100 includes a rear brake pad 31 attached to the rear wheels 30, a rear wheel cylinder 32 in which a rear brake piston (not shown) for moving the rear brake pad 31 is slidably provided, and a brake fluid pipe 33 connected to the rear wheel cylinder 32. The rear brake pad 31 is provided so as to sandwich a floating rotor (not shown) that rotates with the rear wheels 30. When the rear brake pad 31 is pushed by the rear brake piston in the rear wheel cylinder 32, it contacts the floating rotor and a frictional force is generated, and a braking force is generated on the rear wheels 30 that rotate with the floating rotor.

[0016] The brake hydraulic control system 100 includes a second master cylinder 35 attached to the foot pedal 34, a second reservoir 36 for storing brake fluid, and a brake fluid pipe 37 connected to the second master cylinder 35. A master cylinder piston (not shown) is slidably provided in the second master cylinder 35. When the foot pedal 34 is operated, the master cylinder piston in the second master cylinder 35 moves. Since the pressure of the brake fluid applied to the rear brake piston changes depending on the position of the master cylinder piston, the force with which the rear brake pad 31 sandwiches the floating rotor changes, and the braking force of the rear wheels 30 also changes.

[0017] <Configuration of the Brake Hydraulic Unit 1> FIG. 2 is an exploded perspective view showing the brake hydraulic unit 1 according to Embodiment 1. As shown in FIGS. 1 and 2, the brake hydraulic unit 1 is incorporated into a vehicle such as a motorcycle. The brake hydraulic unit 1 includes an internal flow path 4 through which the brake fluid flows, a pump device 2 used to convey the brake fluid in the internal flow path 4 to the first master cylinder 25 and the second master cylinder 35 side, and an adjustable control valve 3 provided in the front wheel hydraulic circuit C1 and the rear wheel hydraulic circuit C2. The control valve 3 includes a first pressure increasing valve 3A and a first pressure reducing valve 3B, and a second pressure increasing valve 3C and a second pressure reducing valve 3D.

[0018] The brake hydraulic unit 1 also includes various ports P connected to corresponding fluid pipes such as the brake fluid pipe 23, a first float restrictor 5A and a second float restrictor 5B for regulating the flow rate of the brake fluid flowing through the internal flow path 4, and a first accumulator section 6A and a second accumulator section 6B capable of storing the brake fluid. The various ports P include a first port P1, a second port P2, a third port P3, and a fourth port P4.

[0019] Furthermore, the brake hydraulic unit 1 includes an electronic control unit 7 having an electronic control board for controlling the opening and closing of the control valve 3, etc., and a detection section 8 including a first pressure sensor 8A for detecting the pressure of the front wheel cylinder 22 and a second pressure sensor 8B for detecting the pressure of the rear wheel cylinder 32. The brake hydraulic unit 1 integrates the internal flow path 4, the pump device 2, the control valve 3, the various ports P, the first float restrictor 5A and the second float restrictor 5B, and the first accumulator section 6A and the second accumulator section 6B on a metal base 10.

[0020] (Internal flow path 4) The internal flow path 4 is formed in the base 10 and includes a first internal flow path 4A, a second internal flow path 4B, and a third internal flow path 4C that constitute part of the front wheel hydraulic circuit C1, and a fourth internal flow path 4D, a fifth internal flow path 4E, and a sixth internal flow path 4F that constitute part of the rear wheel hydraulic circuit C2.

[0021] The first internal flow path 4A is connected to the outflow side of the brake fluid of the pump device 2, the first pressure increasing valve 3A, and the first port P1. Further, a first float restrictor 5A is provided in the first internal flow path 4A. The second internal flow path 4B is connected to the first pressure increasing valve 3A, the first pressure reducing valve 3B, and the third port P3. Further, a first pressure sensor 8A is provided in the second internal flow path 4B. The third internal flow path 4C is connected to the inflow side of the brake fluid of the pump device 2 and the first pressure reducing valve 3B. Further, a first accumulator section 6A is provided in the third internal flow path 4C.

[0022] The fourth internal flow path 4D is connected to the outflow side of the brake fluid of the pump device 2, the second pressure increasing valve 3C, and the second port P2. Further, a second float restrictor 5B is provided in the fourth internal flow path 4D. The fifth internal flow path 4E is connected to the second pressure increasing valve 3C, the second pressure reducing valve 3D, and the fourth port P4. Further, a second pressure sensor 8B is provided in the fifth internal flow path 4E. The sixth internal flow path 4F is connected to the inflow side of the brake fluid of the pump device 2 and the second pressure reducing valve 3D. Further, a second accumulator section 6B is provided in the sixth internal flow path 4F.

[0023] (Pump device 2) The pump device 2 includes a drive mechanism 2A that can be configured by, for example, a DC motor or the like, and two pump elements 2B to which a driving force is applied by the drive mechanism 2A. The drive mechanism 2A includes a stator, a rotor, etc., and the rotational speed is controlled by the electronic control unit 7. One pump element 2B is used for conveying the brake fluid in the front wheel hydraulic circuit C1. Also, one pump element 2B conveys the brake fluid in the third internal flow path 4C to the first internal flow path 4A side. The other pump element 2B is used for conveying the brake fluid in the rear wheel hydraulic circuit C2. Also, the other pump element 2B conveys the brake fluid in the sixth internal flow path 4F to the fourth internal flow path 4D side.

[0024] (Adjusting valve 3) The regulating valve 3 is a valve provided in the internal flow path 4. The opening and closing of the regulating valve 3 are controlled by the electronic control unit 7. The regulating valve 3 includes a first pressure increasing valve 3A, a first pressure reducing valve 3B, a second pressure increasing valve 3C, and a second pressure reducing valve 3D. The regulating valve 3 can be configured, for example, using a solenoid-operated electromagnetic valve, and the energization is controlled by the electronic control unit 7 to switch the open / closed state.

[0025] One side of the first pressure increasing valve 3A is connected to the first internal flow path 4A, and the other side is connected to the second internal flow path 4B. The first pressure increasing valve 3A is a valve that is opened when increasing the pressure of the brake fluid in the front wheel cylinder 22 during ABS operation. That is, when the first pressure increasing valve 3A is opened, the brake fluid on the first internal flow path 4A side is pushed into the second internal flow path 4B side by the action of the first master cylinder 25 and one of the pump elements 2B corresponding to the first master cylinder 25. As a result, the pressure in the front wheel cylinder 22 increases, the opening of the front brake pad 21 becomes smaller, and the braking force of the front wheel 20 increases.

[0026] One side of the first pressure reducing valve 3B is connected to the third internal flow path 4C, and the other side is connected to the second internal flow path 4B. The first pressure reducing valve 3B is a valve that is opened when reducing the pressure of the brake fluid in the front wheel cylinder 22 during ABS operation. That is, when the first pressure reducing valve 3B is opened, the brake fluid in the brake fluid pipe 23 and the second internal flow path 4B is drawn into the third internal flow path 4C side by the action of one of the pump elements 2B. As a result, the pressure in the front wheel cylinder 22 decreases, the opening of the front brake pad 21 becomes larger, and the braking force of the front wheel 20 decreases. When opening the first pressure reducing valve 3B during ABS operation, the first pressure increasing valve 3A is closed, and when opening the first pressure increasing valve 3A, the first pressure reducing valve 3B is closed.

[0027] The second pressure increasing valve 3C also has a configuration and function corresponding to those of the first pressure increasing valve 3A. One side of the second pressure increasing valve 3C is connected to the fourth internal flow path 4D, and the other side is connected to the fifth internal flow path 4E. The second pressure increasing valve 3C is a valve that opens when increasing the pressure of the brake fluid in the rear wheel cylinder 32 during ABS operation. That is, when the second pressure increasing valve 3C opens, the brake fluid on the fourth internal flow path 4D side is pushed into the fifth internal flow path 4E side by the action of the second master cylinder 35 and the other pump element 2B corresponding to the second master cylinder 35. As a result, the pressure in the rear wheel cylinder 32 increases, the opening of the rear brake pad 31 becomes smaller, and the braking force of the rear wheel 30 increases.

[0028] The second pressure reducing valve 3D also has a configuration and function corresponding to those of the first pressure reducing valve 3B. One side of the second pressure reducing valve 3D is connected to the sixth internal flow path 4F, and the other side is connected to the fifth internal flow path 4E. The second pressure reducing valve 3D is a valve that opens when reducing the pressure of the brake fluid in the rear wheel cylinder 32 during ABS operation. That is, when the second pressure reducing valve 3D opens, the brake fluid in the brake fluid pipe 33 and the fifth internal flow path 4E is drawn into the sixth internal flow path 4F side by the action of the other pump element 2B. As a result, the pressure in the rear wheel cylinder 32 decreases, the opening of the rear brake pad 31 becomes larger, and the braking force of the rear wheel 30 decreases. When the second pressure reducing valve 3D is opened during ABS operation, the second pressure increasing valve 3C is closed, and when the second pressure increasing valve 3C is opened, the second pressure reducing valve 3D is closed.

[0029] (Various ports P) The various ports P include a first port P1 corresponding to a drive mechanism such as the handle lever 24, a second port P2 corresponding to a drive mechanism such as the foot pedal 34, a third port P3 corresponding to a drive mechanism such as the front brake pad 21, and a fourth port P4 corresponding to a drive mechanism such as the rear brake pad 31. The first port P1 is connected to the brake fluid pipe 27 and the first internal flow path 4A. The second port P2 is connected to the brake fluid pipe 37 and the fourth internal flow path 4D. The third port P3 is connected to the second internal flow path 4B and the brake fluid pipe 23. The fourth port P4 is connected to the fifth internal flow path 4E and the brake fluid pipe 33.

[0030] (The first float restrictor 5A and the second float restrictor 5B) The first float restrictor 5A is provided at a portion on the outflow side of the brake fluid of one pump element 2B in the first internal flow path 4A. The second float restrictor 5B is provided at a portion on the outflow side of the brake fluid of the other pump element 2B in the fourth internal flow path 4D. Due to the action of the first float restrictor 5A, the brake fluid can flow out from the side of one pump element 2B to the side of the first master cylinder 25, and the rapid increase in the pressure of the brake fluid in the first master cylinder 25 can be suppressed. The second float restrictor 5B also has an action corresponding to that of the first float restrictor 5A, and the rapid increase in the pressure of the brake fluid in the second master cylinder 35 can be suppressed.

[0031] (The first accumulator section 6A and the second accumulator section 6B) The first accumulator section 6A is provided in the third internal flow path 4C. The first accumulator section 6A is used, for example, to hold the hydraulic pressure of the brake fluid in the front wheel hydraulic circuit C1. The second accumulator section 6B is provided in the sixth internal flow path 4F. The second accumulator section 6B is used to hold the hydraulic pressure of the brake fluid in the rear wheel hydraulic circuit C2.

[0032] (The electronic control unit 7 and the detection unit 8) The electronic control unit 7 receives the signal from the detection unit 8 and controls the rotational speed of the drive mechanism 2A of the pump device 2, the opening and closing of the regulating valve 3, etc. When the ABS is activated, the electronic control unit 7 controls the opening and closing of the regulating valve 3 to adjust the brake fluid pressure in the front wheel cylinder 22 and the rear wheel cylinder 32, thereby avoiding the front wheels 20 and the rear wheels 30 from locking up.

[0033] <Support structure 40 of the brake fluid pressure unit 1> Next, the support structure 40 of the brake fluid pressure unit 1 will be described. FIG. 3 is a perspective view showing the support structure 40 of the brake fluid pressure unit 1 according to the first embodiment. FIG. 4 is an exploded perspective view showing the support structure 40 of the brake fluid pressure unit 1 according to the first embodiment. As shown in FIG. 3, the brake fluid pressure unit 1 is attached to the vehicle-side brackets 60 and 61 by the support structure 40 of the brake fluid pressure unit 1. The configuration in which the brake fluid pressure unit 1 is assembled to the support structure 40 is defined as the brake fluid pressure control device 80 of the present invention. The support structure 40 is composed of a bracket 41 made of a plate-like member, a fixing member 49, and a first support portion 42 and a second support portion 43 which are composed of a first vibration absorbing member 51, a second vibration absorbing member 52, etc. having elasticity.

[0034] <Bracket 41> The bracket 41 supports the base body 10 of the brake fluid pressure unit 1. The bracket 41 is formed by bending a flat plate member such as a steel plate, and is mainly composed of a first plate-like portion 41a and a second plate-like portion 41b formed substantially perpendicular to the first plate-like portion 41a.

[0035] The first plate-like portion 41a and the second plate-like portion 41b support the lower surface portion 10b and the side surface portion 10c which are configured substantially perpendicular to the motor attachment surface portion 10a to which the drive mechanism 2A in the base body 10 is attached, respectively. The first plate-like portion 41a supports the lower surface portion 10b via the first support portion 42, and the second plate-like portion 41b supports the side surface portion 10c via the second support portion 43.

[0036] As shown in FIG. 4, a circular first opening 41da for assembling the first support portion 42 is formed to penetrate in the thickness direction of the first plate-like portion 41a. Also, at one end of the first plate-like portion 41a, a mounting piece 41c bent substantially perpendicular to the first plate-like portion 41a is formed. In the mounting piece 41c, a first fixing hole 41f for connecting the bracket 41 to the vehicle-side brackets 60, 61 with bolts or the like is formed to penetrate in the thickness direction of the mounting piece 41c.

[0037] In the second plate-like portion 41b, a circular second opening 41db for assembling the second support portion 43 is formed to penetrate in the thickness direction of the second plate-like portion 41b. Furthermore, in the second plate-like portion 41b, a second fixing hole 41g for connecting the bracket 41 to the vehicle-side brackets 60, 61 with bolts or the like is formed to penetrate in the thickness direction of the second plate-like portion 41b.

[0038] Since the first support portion 42 and the second support portion 43 have the same structure, in the following description, the first opening 41da of the first support portion 42 and the second opening 41db of the second support portion 43 may both be referred to as the opening 41d.

[0039] <The first support portion 42 and the second support portion 43> FIG. 5 is a cross-sectional view passing through the axis C when the first support portion 42 and the second support portion 43 according to the present embodiment are assembled. FIG. 6 is an exploded cross-sectional view of the first support portion 42 and the second support portion 43 according to the present embodiment. The configuration of the first support portion 42 will be described with reference to FIGS. 5 and 6. Since the configuration of the second support portion 43 is the same as that of the first support portion 42, the description thereof will be omitted.

[0040] Still, in the first support portion 42 and the second support portion 43 described below, for convenience of explanation, the base 10 side (upper side on the paper surface) of the brake hydraulic unit 1 shown in FIGS. 5 and 6 is regarded as the upper surface side of the first support portion 42 and the second support portion 43, and the opposite side (lower side on the paper surface) is regarded as the lower surface side of the first support portion 42 and the second support portion 43 for explanation.

[0041] As shown in FIGS. 5 and 6, the first support portion 42 includes a first vibration absorbing member 51, a second vibration absorbing member 52, and a fixing member 49. The first vibration absorbing member 51 and the second vibration absorbing member 52 are cylindrical vibration absorbing members formed of elastic rubber, resin, or silicon, etc., and having a hole in the central portion. The first vibration absorbing member 51 and the second vibration absorbing member 52 are fixed between the lower disk portion 49d located at the lower end surface of the fixing member 49 and the base 10 of the brake hydraulic unit 1 by the fixing member 49 in a state where the first support portion 42 is assembled. At this time, the first vibration absorbing member 51 is disposed between the brake hydraulic unit 1 and the second vibration absorbing member 52 and is fixed to the first opening 41da of the bracket 41. At this time, it is desirable as the support structure 40 that the position of the first support portion 42 is such that the axis C of the fixing member 49 passes through the center of gravity of the brake hydraulic unit 1.

[0042] (First vibration absorbing member 51) The first vibration absorption member 51 is formed in a substantially cylindrical shape centered on the axis C. The first vibration absorption member 51 includes a main body portion 51a, an outer cylindrical portion 51b formed on the outer side in the radial direction below the main body portion 51a, and an inner cylindrical portion 51c formed on the inner side in the radial direction below the main body portion 51a. The outer cylindrical portion 51b and the inner cylindrical portion 51c form a circumferential groove on the lower surface of the main body portion 51a. In the present embodiment, a bent portion 41e is formed in which the edge of the first opening 41da of the bracket 41 is bent upward and erected, and the bent portion 41e fits into the circumferential groove formed by the outer cylindrical portion 51b and the inner cylindrical portion 51c. Further, the first vibration absorption member 51 has a stepped through-hole through which the fixing member 49 is inserted in the direction of the axis C. The stepped through-hole includes an upper through-hole 51d and a lower through-hole 51e, and the inner diameter of the upper through-hole 51d is formed smaller than the inner diameter of the lower through-hole 51e.

[0043] (The second vibration absorption member 52) The second vibration absorption member 52 has a different hardness from the first vibration absorption member 51 and is formed in a substantially cylindrical shape centered on the axis C. The second vibration absorption member 52 includes a concave portion 52d on the upper surface portion, and when the first support portion 42 is assembled, the inner cylindrical portion 51c of the first vibration absorption member 51 fits into the concave portion. The outer peripheral portion of the second vibration absorption member 52 has an outer cylindrical shape portion 52c with a cylindrical shape on the upper side and an outer conical portion 52b with an outer diameter that decreases downward on the lower side. And the outer diameter of the lower end surface 52a of the second vibration absorption member 52 is formed to be equal to the outer diameter of the lower disk portion 49d of the fixing member 49. Further, the second vibration absorption member 52 has a through-hole 52e through which the fixing member 49 is inserted in the direction of the axis C.

[0044] (The fixing member 49) The fixing member 49 includes an upper cylindrical portion 49a press-fitted into the mounting hole 10d of the base body 10, a second cylindrical portion 49b located below the upper cylindrical portion and having a larger diameter than the upper cylindrical portion 49a, a third cylindrical portion 49c located below the second cylindrical portion 49b and having a larger diameter than the second cylindrical portion 49b, and a lower disk portion 49d located below the third cylindrical portion 49c and having a larger diameter than the third cylindrical portion 49c.

[0045] (Assembly of the first support portion 42 and the second support portion 43) In the present embodiment, a region with a slightly smaller diameter is provided in the lower portion of the third cylindrical portion 49c of the fixing member 49, and the second vibration absorbing member 52 is fitted into the region. By adopting such a configuration, when assembling the first support portion 42, the second vibration absorbing member 52 is first assembled to the fixing member 49 (hereinafter, this is referred to as the first sub-assembly). Further, in the present embodiment, the first vibration absorbing member 51 is assembled to the opening 41d of the bracket 41 (hereinafter, this is referred to as the second sub-assembly). Then, the second assembly is arranged at a predetermined position with respect to the base body 10, and the fixing member 49 of the first sub-assembly is inserted into the upper through hole 51d and the lower through hole 51e of the first vibration absorbing member 51 of the second assembly, and the upper cylindrical portion 49a of the fixing member 49 is press-fitted into the mounting hole 10d formed in the base body 10. At this time, the second cylindrical portion 49b of the fixing member 49 is located within the upper through hole 51d of the first vibration absorbing member 51, and the third cylindrical portion 49c of the fixing member 49 is located within the lower through hole 51e of the first vibration absorbing member 51. As described above, by creating the first assembly and the second assembly in advance, the assembly work becomes easy. Further, in the present embodiment, since the outer diameter of the lower end surface of the second vibration absorbing member 52 is formed to be equal to the outer diameter of the lower disk portion 49d of the fixing member 49, the press-fitting force of the fixing member 49 can be effectively transmitted to the second vibration absorbing member 52 and the first vibration absorbing member 51.

[0046] Furthermore, according to the present invention, if the first vibration absorbing member 51 and the second vibration absorbing member 52 are accidentally arranged in reverse, the fixing member 49 cannot be assembled. Specifically, FIG. 7 shows a case where the second vibration absorbing member 52 is arranged between the bracket 41 and the base body 10, and the first vibration absorbing member 51 is arranged below the bracket 41. In this case, when the fixing member 49 is inserted, when the second cylindrical portion 49b of the fixing member 49 is arranged in the upper through hole 51d of the first vibration absorbing member 51, the fixing member 49 can no longer rise. Therefore, the upper cylindrical portion 49a of the fixing member 49 does not reach the mounting hole 10d of the base body 10. In other words, the fixing member 49 cannot be press-fitted into the mounting hole 10d of the base body 10. That is, the present invention has a function of preventing incorrect assembly of the first vibration absorbing member 51 and the second vibration absorbing member 52. FIG. 8 shows a case where the second vibration absorbing member 52 is arranged upside down with respect to FIG. 7. FIG. 9 shows a case where the first vibration absorbing member 51 is arranged upside down with respect to FIG. 7. FIG. 10 shows a case where the second vibration absorbing member 52 is arranged upside down with respect to FIG. 9. In any of the cases from FIG. 7 to FIG. 10, the upper cylindrical portion 49a of the fixing member 49 cannot be press-fitted into the mounting hole 10d of the base body 10, that is, the structure is such that incorrect assembly cannot occur.

[0047] As described above, according to the present invention, by combining different vibration absorbing members, it is possible to avoid the natural frequencies of the vibration system of the brake hydraulic unit. Further, when assembling the first support portion 42 and the second support portion 43, by first creating the first assembly and the second assembly, the assembly work becomes easier. Further, the bent portion 41e of the bracket 41 is fitted into the circumferential groove formed by the outer cylindrical portion 51b and the inner cylindrical portion 51c of the first vibration absorbing member 51, so that the stability after the first support portion 42 and the second support portion 43 are assembled can be improved. Further, since the outer diameter of the lower end surface of the second vibration absorbing member 52 is formed to be equal to the outer diameter of the lower disk portion 49d of the fixing member 49, the fixing force by press-fitting the fixing member 49 can be transmitted more efficiently to the second vibration absorbing member 52 and the first vibration absorbing member 51. Further, the first vibration absorbing member 51 and the second vibration absorbing member 52 cannot be assembled in reverse.

Explanation of Signs

[0048] 1: Brake hydraulic unit, 10: Base body, 10d: Mounting hole, 40: Support structure, 41: Bracket, 41d: Opening, 41e: Bent portion, 49: Fixing member, 49d: Lower disk portion, 51: First vibration absorbing member, 52: Second vibration absorbing member, 80: Brake hydraulic control device

Claims

1. In a brake hydraulic control device (80) comprising a brake hydraulic unit (1) for controlling the hydraulic pressure of the brake fluid supplied to a braking unit, and a support structure (40) for attaching the brake hydraulic unit (1) to a vehicle, the support structure (40) has a fixing member (49), a bracket (41), a first vibration absorbing member (51), and a second vibration absorbing member (52); the first vibration absorbing member (51) is fixed to an opening (41d) formed in the bracket (41); the fixing member (49) penetrates through the first vibration absorbing member (51) and the second vibration absorbing member (52), and one end portion thereof is press-fitted into the brake hydraulic unit (1); on the second vibration absorbing member (52), the surface on the brake hydraulic unit (1) side abuts against the bracket (41), and the surface on the side opposite to the surface abutting against the bracket (41) abuts against a lower disk portion (49d) formed at the other end portion of the fixing member (49); the edge portion of the opening (41d) has a bent portion (41e) standing upright toward the brake hydraulic unit (1) side; the bent portion (41e) fits into a groove portion formed in the first vibration absorbing member (51); A brake hydraulic control device (80).

2. The bent portion (41e) has a cylindrical shape, The brake hydraulic control device (80) according to Claim 1.

3. The first vibration absorbing member (51) and the second vibration absorbing member (52) have different hardnesses from each other. The brake hydraulic control device (80) according to Claim 1 or 2.

4. The first vibration absorbing member (51) and the second vibration absorbing member (52) are formed of different materials from each other. The brake hydraulic control device (80) according to any one of Claims 1 to 3.

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