Hydraulic pressure control unit, straddle-type vehicle, and method for manufacturing hydraulic pressure control unit

Abstract

To provide a hydraulic control unit for a saddle-riding type vehicle, which includes a pump for moving a brake fluid and a holder for holding a filter through which the brake fluid passes in the pump, can be miniaturized, and can prevent the holder from not being provided in a prescribed posture.SOLUTION: The hydraulic pressure control unit includes a base body in which an internal flow path that allows a wheel cylinder and a master cylinder to communicate with each other is formed, and a pump that moves a brake fluid in the internal flow path, wherein the base body includes a recessed portion in which the pump is provided, the pump includes a cylinder in which a compression chamber that compresses the brake fluid is formed, a piston portion whose input-side end portion is pressed by a motor and whose partition-side end portion is inserted into the compression chamber to partition the compression chamber, and a holder that holds a filter through which the brake fluid flowing into the inflow flow path passes, and the holder includes an abutting portion whose base end portion is connected to the cylinder and that abuts on a wall surface of the recessed portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a hydraulic control unit for a saddle-ride type vehicle, a saddle-ride type vehicle equipped with the hydraulic control unit, and a method for manufacturing a hydraulic control unit for a saddle-ride type vehicle. [Background technology]

[0002] Some vehicles are equipped with a hydraulic control unit that controls the hydraulic pressure of brake fluid in a hydraulic circuit filled with brake fluid. For example, when a driver of the vehicle operates an input device such as a brake lever, the hydraulic control unit increases or decreases the hydraulic pressure of the brake fluid in the hydraulic circuit to adjust the braking force generated at the wheels and perform anti-lock brake control. Such a conventional hydraulic control unit includes a base body having an internal flow path that connects the wheel cylinders and the master cylinder, and a pump that moves the brake fluid through the internal flow path. The pump is provided in a recess formed in the base body.

[0003] The pump of the conventional hydraulic control unit includes a cylinder and a piston. The cylinder defines a compression chamber for compressing brake fluid. One end of the piston, the input end, is pressed by a motor that drives the pump, and the other end, the partition end, is inserted into the compression chamber. The piston defines an inlet flow path through which brake fluid flowing toward the pump through an internal flow path flows and guides the brake fluid to the compression chamber. The piston also defines a partition, the diameter of which is larger than that of the partition end, in a region inserted into the compression chamber, between the input end and the partition end. The partition defines the compression chamber, and the partition reciprocates within the compression chamber. That is, in the pump of the conventional hydraulic control unit, a space is defined between the outer peripheral surface of the partition end of the piston and the inner peripheral surface of the compression chamber. In the pump of the conventional hydraulic control unit, some of the components constituting the pump are disposed in the space (see, for example, Patent Document 1). For example, in the pump described in Patent Document 1, a check valve that prevents the backflow of brake fluid from the compression chamber and a return spring that presses the piston toward the motor are disposed in the space. Furthermore, the pump of a conventional hydraulic control unit is provided with a holder that has one end connected to the cylinder and that holds a filter through which brake fluid flows into the inlet flow path. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-299392 Summary of the Invention [Problem to be solved by the invention]

[0005] A straddle-type vehicle, which is a type of vehicle, has a lower degree of freedom in component layout and installation of a hydraulic control unit compared to vehicles such as four-wheeled automobiles. For this reason, there has been a demand for a smaller hydraulic control unit to be installed in a straddle-type vehicle. Furthermore, when miniaturizing a hydraulic control unit, it is necessary to prevent the holder from being installed in a specified position.

[0006] The present invention has been made in light of the above-mentioned problems, and has as its first object to provide a hydraulic control unit for a saddle-ride type vehicle that includes a pump for moving brake fluid and a holder for holding a filter through which the brake fluid passes, the hydraulic control unit being smaller than conventional units and capable of preventing the holder from being installed in a specified position. A second object of the present invention is to provide a saddle-ride type vehicle that includes such a hydraulic control unit. A third object of the present invention is to provide a method for manufacturing such a hydraulic control unit. [Means for solving the problem]

[0007] The hydraulic control unit of the present invention is a hydraulic control unit for a brake system mounted on a saddle-ride vehicle, and comprises: a base body having an internal flow path formed therein that connects a wheel cylinder and a master cylinder; and a pump that moves brake fluid in the internal flow path; the base body has a recess in which the pump is provided; the pump comprises a cylinder having a compression chamber that compresses brake fluid; and a piston portion having an input side end at one end pressed by a motor that is a drive source of the pump and a partition side end at the other end inserted into the compression chamber to partition the compression chamber, the partition side end reciprocating within the compression chamber; the piston portion has an inlet flow path into which brake fluid that has flowed through the internal flow path toward the pump flows and which guides the brake fluid to the compression chamber; the pump comprises a holder that holds a filter through which brake fluid flowing into the inlet flow path passes; the holder is positioned on the bottom side of the recess relative to the cylinder; one end, a base end, is connected to the cylinder; the holder covers a portion of the piston portion; and the holder has an abutment portion that abuts against the wall of the recess.

[0008] A straddle-type vehicle according to the present invention includes the hydraulic pressure control unit according to the present invention.

[0009] The manufacturing method of a hydraulic control unit according to the present invention is a manufacturing method of a hydraulic control unit of a brake system mounted on a saddle-ride type vehicle, the hydraulic control unit comprising: a base body having an internal flow path formed therein that connects a wheel cylinder and a master cylinder; and a pump that moves brake fluid in the internal flow path, the base body having a recess in which the pump is provided, the pump comprising a cylinder having a compression chamber that compresses brake fluid, an input side end which is one end pressed by a motor that is a drive source of the pump, and a partition side end which is the other end inserted into the compression chamber to partition the compression chamber, the partition side end being a cylinder that compresses brake fluid. and a piston portion that reciprocates within a compression chamber, and the piston portion has an inlet flow path into which brake fluid that has flowed through the internal flow path toward the pump flows and which directs the brake fluid to the compression chamber.The pump has a holder that holds a filter through which brake fluid flowing into the inlet flow path passes, and one end of the holder, a base end, is connected to the cylinder and covers part of the piston portion.The pump is inserted into the recess in an orientation where the holder is positioned on the bottom side of the recess relative to the cylinder, and an abutment step is provided in which the abutment portion of the holder is abutted against the wall of the recess. [Effects of the Invention]

[0010] In the piston portion of the pump of the hydraulic control unit according to the present invention, the partition-side end portion, which has a smaller diameter than the conventional partition portion, defines the compression chamber. Therefore, the hydraulic control unit according to the present invention can have a smaller compression chamber than the conventional one, thereby making it possible to reduce the size of the hydraulic control unit.

[0011] If the compression chamber is partitioned by the partition-side end of the piston, the pump components that were located inside the compression chamber in a conventional hydraulic control unit are now located outside the compression chamber, such as in a space surrounded by the cylinder and a holder that holds a filter. Therefore, the holder of the hydraulic control unit according to the present invention may be longer in the direction of reciprocation of the piston compared to the holder of a conventional hydraulic control unit. In such a case, those skilled in the art may be concerned that the holder will not be installed in the recess of the base in the specified orientation, resulting in the pump not being properly attached to the base. However, in the hydraulic control unit according to the present invention, the holder includes an abutment that abuts against the wall of the recess of the base. Therefore, in the hydraulic control unit according to the present invention, the holder is supported at both the abutment point on the wall of the recess with the abutment and the cylinder. Therefore, the hydraulic control unit according to the present invention can also prevent the holder from being installed in the recess of the base in the specified orientation. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram showing the configuration of a straddle-type vehicle equipped with a brake system including a hydraulic pressure control unit according to an embodiment of the present invention; [Figure 2] 1 is a diagram showing a configuration of a brake system including a hydraulic pressure control unit according to an embodiment of the present invention; [Figure 3] 2 is a cross-sectional view showing the periphery of a pump and a motor of the hydraulic control unit according to the embodiment of the present invention. FIG. [Figure 4] 5 is a flowchart illustrating a method for attaching the hydraulic control unit to the base of the pump according to the embodiment of the present invention. [Figure 5] 1 is a cross-sectional view illustrating a method for attaching a hydraulic control unit to a base of a pump according to an embodiment of the present invention, showing the periphery of the pump. FIG. [Figure 6] FIG. 10 is a cross-sectional view showing a modified example of the hydraulic control unit according to the embodiment of the present invention, illustrating the periphery of the pump and the motor. [Figure 7]FIG. 10 is a cross-sectional view showing a modified example of the hydraulic control unit according to the embodiment of the present invention, illustrating the periphery of the pump and the motor. DETAILED DESCRIPTION OF THE INVENTION

[0013] A hydraulic pressure control unit and a saddle-ride type vehicle according to the present invention will be described below with reference to the drawings. In the following, an example will be described in which the hydraulic control unit according to the present invention is mounted on a motorcycle, which is an example of a saddle-ride type vehicle. However, the hydraulic control unit according to the present invention may also be mounted on other saddle-ride type vehicles other than motorcycles. Examples of other saddle-ride type vehicles other than motorcycles include bicycles (e.g., two-wheeled vehicles, three-wheeled vehicles, etc.), three-wheeled vehicles using at least one of an engine and an electric motor as a drive source, and buggies. Furthermore, the term "bicycle" refers to any vehicle that can be propelled on a road by pedal force applied to the pedals. In other words, bicycles include standard bicycles, electrically assisted bicycles, and electric bicycles. Furthermore, a motorcycle or three-wheeled vehicle refers to a so-called motorcycle, which includes a motorcycle, a scooter, an electric scooter, etc.

[0014] In addition, although the following describes an example in which the hydraulic pressure control unit according to the present invention is used in a brake system equipped with two hydraulic circuits, the number of hydraulic circuits in a brake system in which the hydraulic pressure control unit according to the present invention is used is not limited to two. A brake system in which the hydraulic pressure control unit according to the present invention is used may be equipped with only one hydraulic circuit, or may be equipped with three or more hydraulic circuits.

[0015] Furthermore, the configurations, operations, etc. described below are merely examples, and the present invention is not limited to such configurations, operations, etc. Furthermore, in each drawing, the same or similar members or parts may be assigned the same reference numerals or may not be assigned the reference numerals. Furthermore, detailed structures may be appropriately simplified or omitted from the illustration.

[0016] Embodiment <Brake system configuration and operation> The configuration and operation of a brake system including a hydraulic pressure control unit according to this embodiment will be described. Fig. 1 is a diagram showing the configuration of a saddle-ride type vehicle equipped with a brake system including a hydraulic pressure control unit according to an embodiment of the present invention, and Fig. 2 is a diagram showing the configuration of a brake system including a hydraulic pressure control unit according to an embodiment of the present invention.

[0017] 1 and 2, the brake system 10 is mounted on a saddle-riding vehicle 200. The saddle-riding vehicle 200 is, for example, a motorcycle powered by an engine. The saddle-riding vehicle 200 includes a body 1, a handlebar 2 rotatably held by the body 1, a front wheel 3 rotatably held together with the handlebar 2 by the body 1, and a rear wheel 4 rotatably held by the body 1.

[0018] The brake system 10 includes a brake lever 11, a first hydraulic circuit 12 filled with brake fluid, a brake pedal 13, and a second hydraulic circuit 14 filled with brake fluid. The brake lever 11 is provided on the steering wheel 2 and is operated by the driver's hand. The first hydraulic circuit 12 generates a braking force in a rotor 3a that rotates together with the front wheels 3 according to the amount of operation of the brake lever 11. The brake pedal 13 is provided on the lower part of the body 1 and is operated by the driver's foot. The second hydraulic circuit 14 generates a braking force in a rotor 4a that rotates together with the rear wheels 4 according to the amount of operation of the brake pedal 13.

[0019] The brake lever 11 and the brake pedal 13 are examples of brake input units. For example, a brake pedal other than the brake pedal 13 provided on the body 1 may be used as a brake input unit instead of the brake lever 11. Also, for example, a brake lever other than the brake lever 11 provided on the handlebars 2 may be used as a brake input unit instead of the brake pedal 13. Also, the first hydraulic circuit 12 may generate a braking force on the rotor 4a that rotates together with the rear wheel 4 in accordance with the amount of operation of the brake lever 11 or a brake pedal other than the brake pedal 13 provided on the body 1. Also, the second hydraulic circuit 14 may generate a braking force on the rotor 3a that rotates together with the front wheel 3 in accordance with the amount of operation of the brake pedal 13 or a brake lever other than the brake lever 11 provided on the handlebars 2.

[0020] The first hydraulic pressure circuit 12 and the second hydraulic pressure circuit 14 have the same configuration. Therefore, the configuration of the first hydraulic pressure circuit 12 will be described below as a representative. The first hydraulic circuit 12 includes a master cylinder 21 incorporating a piston (not shown), a reservoir 22 attached to the master cylinder 21, a brake caliper 23 having brake pads (not shown), and a wheel cylinder 24 that operates the brake pads (not shown) of the brake caliper 23.

[0021] An internal flow path 40 that connects the wheel cylinders 24 and the master cylinder 21 is formed in the base 101 of the hydraulic control unit 100. Specifically, the internal flow path 40 connects to the master cylinder 21 via a fluid pipe 15 (described later) and to the wheel cylinders 24 via a fluid pipe 16 (described later). In this embodiment, the base 101 is formed with a main flow path 41, a sub-flow path 42, and a booster flow path 43 as the internal flow path 40. In the first hydraulic circuit 12, the master cylinder 21 and the wheel cylinders 24 communicate with each other via the fluid pipe 15 connected between the master cylinder 21 and a master cylinder port MP formed in the base 101, the main flow path 41 formed in the base 101, and the fluid pipe 16 connected between the wheel cylinders 24 and a wheel cylinder port WP formed in the base 101. Brake fluid in the wheel cylinders 24 is released to a main flow path intermediate portion 41a, which is an intermediate portion of the main flow path 41, via the sub-flow path 42. The brake fluid in the master cylinder 21 is supplied to a secondary flow path intermediate portion 42 a that is an intermediate portion of the secondary flow path 42 via a pressure increasing flow path 43 .

[0022] An inlet valve 25 is provided in a region of the main flow path 41 closer to the wheel cylinder 24 than the main flow path intermediate portion 41a. Opening and closing of the inlet valve 25 opens and closes the portion of the main flow path 41 where the inlet valve 25 is located, thereby controlling the flow rate of brake fluid flowing through this region. In a region of the secondary flow path 42 upstream of the secondary flow path intermediate portion 42a, a release valve 26 and an accumulator 27 that stores brake fluid are provided, in this order from upstream to downstream. Opening and closing of the release valve 26 opens and closes the portion of the secondary flow path 42 where the release valve 26 is located, thereby controlling the flow rate of brake fluid flowing through this region. In addition, a pump 50 is provided in a region of the secondary flow path 42 downstream of the secondary flow path intermediate portion 42a, which applies pressure to the brake fluid in the secondary flow path 42 and moves the brake fluid. In other words, the pump 50 moves the brake fluid in the internal flow path 40. In the following, the portion of the sub-channel 42 that is upstream of the pump 50 may be referred to as a first sub-channel 42b. Also, the portion of the sub-channel 42 that is downstream of the pump 50 may be referred to as a second sub-channel 42c.

[0023] A switching valve 28 is provided in a region of the main flow path 41 closer to the master cylinder 21 than the main flow path intermediate portion 41a. The opening and closing operation of the switching valve 28 opens and closes the flow path portion of the main flow path 41 where the switching valve 28 is installed, thereby controlling the flow rate of brake fluid flowing through this region. A pressure increase valve 29 is provided in the pressure increase flow path 43. The opening and closing operation of the pressure increase valve 29 opens and closes the flow path portion of the pressure increase flow path 43 where the pressure increase valve 29 is installed, thereby controlling the flow rate of brake fluid flowing through the pressure increase flow path 43.

[0024] A master cylinder hydraulic pressure sensor 30 for detecting the hydraulic pressure of the brake fluid in the master cylinder 21 is provided in a region of the main flow path 41 closer to the master cylinder 21 than the switching valve 28. A wheel cylinder hydraulic pressure sensor 31 for detecting the hydraulic pressure of the brake fluid in the wheel cylinder 24 is provided in a region of the main flow path 41 closer to the wheel cylinder 24 than the inlet valve 25.

[0025] In other words, the main flow path 41 communicates between the master cylinder port MP and the wheel cylinder port WP via the inlet valve 25. The secondary flow path 42 is defined as a part or all of the flow path that releases the brake fluid in the wheel cylinder 24 to the master cylinder 21 via the release valve 26. The pressure-boosting flow path 43 is defined as a part or all of the flow path that supplies the brake fluid in the master cylinder 21 to the upstream side of the pump 50 of the secondary flow path 42 via the pressure-boosting valve 29. In other words, the secondary flow path 42 and the pressure-boosting flow path 43 also communicate between the master cylinder port MP and the wheel cylinder port WP.

[0026] The inlet valve 25 is a solenoid valve that switches the flow of brake fluid from open to closed at its installation location when, for example, it changes from a de-energized state to an energized state. The release valve 26 is a solenoid valve that switches the flow of brake fluid from closed to open through its installation location toward the secondary flow path intermediate portion 42a when, for example, it changes from a de-energized state to an energized state. The switching valve 28 is a solenoid valve that switches the flow of brake fluid from open to closed at its installation location when, for example, it changes from a de-energized state to an energized state. The pressure booster valve 29 is a solenoid valve that switches the flow of brake fluid from closed to open through its installation location toward the secondary flow path intermediate portion 42a when, for example, it changes from a de-energized state to an energized state.

[0027] The pump 50 of the first hydraulic pressure circuit 12 and the pump 50 of the second hydraulic pressure circuit 14 are driven by a common motor 90. In other words, the motor 90 is the drive source of the pump 50.

[0028] The hydraulic control unit 100 is composed of a base 101, the various components provided on the base 101 (inlet valve 25, release valve 26, accumulator 27, switching valve 28, pressure booster valve 29, master cylinder hydraulic pressure sensor 30, wheel cylinder hydraulic pressure sensor 31, pump 50, motor 90, etc.), and a control device (ECU) 110.

[0029] Control device 110 controls inlet valve 25, release valve 26, switching valve 28, pressure booster valve 29, and motor 90. There may be one control device 110, or there may be multiple separate control devices. Control device 110 may be attached to base 101, or may be attached to a member other than base 101. Part or all of control device 110 may be configured, for example, by a microcomputer, a microprocessor unit, or the like, or may be configured with updatable firmware, or may be a program module executed by commands from a CPU, or the like.

[0030] For example, under normal conditions, the control device 110 controls the inlet valve 25, the release valve 26, the switching valve 28, and the pressure increase valve 29 to be in a non-energized state. When the brake lever 11 is operated in this state, the piston (not shown) of the master cylinder 21 is pushed in the first hydraulic circuit 12, increasing the hydraulic pressure of the brake fluid in the wheel cylinder 24, and the brake pads (not shown) of the brake caliper 23 are pressed against the rotor 3a of the front wheel 3, thereby braking the front wheel 3. When the brake pedal 13 is operated, the piston (not shown) of the master cylinder 21 is pushed in the second hydraulic circuit 14, increasing the hydraulic pressure of the brake fluid in the wheel cylinder 24, and the brake pads (not shown) of the brake caliper 23 are pressed against the rotor 4a of the rear wheel 4, thereby braking the rear wheel 4.

[0031] The outputs of the various sensors (master cylinder hydraulic pressure sensor 30, wheel cylinder hydraulic pressure sensors 31, wheel speed sensors, acceleration sensors, etc.) are input to the control device 110. In response to these outputs, the control device 110 outputs commands that govern the operation of the inlet valve 25, the release valve 26, the switching valve 28, the pressure increase valve 29, and the motor 90, thereby performing pressure reduction control, pressure increase control, etc.

[0032] For example, when the brake fluid pressure in the wheel cylinder 24 of the first hydraulic pressure circuit 12 is excessive or there is a possibility of excessive brake fluid pressure, the control device 110 executes pressure reduction control to reduce the brake fluid pressure in the wheel cylinder 24 of the first hydraulic pressure circuit 12. In this case, the control device 110 controls the inlet valve 25 to an energized state, the release valve 26 to an energized state, the switching valve 28 to a de-energized state, and the pressure increase valve 29 to a de-energized state in the first hydraulic pressure circuit 12, while driving the motor 90. As a result, the brake fluid in the wheel cylinder 24 of the first hydraulic pressure circuit 12 flows into the secondary flow path 42 through the main flow path 41, and the hydraulic pressure in the wheel cylinder 24 decreases. Then, the brake fluid that flows into the secondary flow path 42 from the wheel cylinder 24 flows into the accumulator 27 through the release valve 26 and is stored in the accumulator 27. The brake fluid stored in the accumulator 27 is returned to the master cylinder 21 by a pump 50 driven by a motor 90 .

[0033] Furthermore, when the brake fluid pressure in the wheel cylinders 24 of the second hydraulic pressure circuit 14 is excessive or there is a possibility of excessive brake fluid pressure, the control device 110 executes pressure reduction control to reduce the brake fluid pressure in the wheel cylinders 24 of the second hydraulic pressure circuit 14. In this case, the control device 110 controls the inlet valve 25 to an energized state, the release valve 26 to an energized state, the switching valve 28 to a de-energized state, and the pressure increase valve 29 to a de-energized state, while driving the motor 90. As a result, the brake fluid in the wheel cylinders 24 of the second hydraulic pressure circuit 14 flows into the secondary flow path 42 through the main flow path 41, and the hydraulic pressure in the wheel cylinders 24 decreases. The brake fluid that flows from the wheel cylinders 24 into the secondary flow path 42 then flows into the accumulator 27 through the release valve 26 and is stored in the accumulator 27. The brake fluid stored in the accumulator 27 is returned to the master cylinder 21 by a pump 50 driven by a motor 90 .

[0034] Furthermore, for example, when the brake fluid pressure in the wheel cylinders 24 of the first hydraulic pressure circuit 12 is insufficient or there is a possibility of such insufficiency, the control device 110 executes pressure-boosting control to increase the hydraulic pressure of the brake fluid in the wheel cylinders 24 of the first hydraulic pressure circuit 12. In this case, the control device 110 controls the inlet valve 25, the release valve 26, the switching valve 28, and the pressure-boosting valve 29 in the first hydraulic pressure circuit 12 to a non-energized state, while driving the motor 90. As a result, the pump 50 driven by the motor 90 causes the brake fluid in the master cylinder 21 of the first hydraulic pressure circuit 12 to flow from the secondary flow path intermediate portion 42a through the main flow path 41 and the pressure-boosting flow path 43 into the secondary flow path 42. The brake fluid that has flowed into the secondary flow path 42 flows from the main flow path intermediate portion 41a into the main flow path 41, passes through the inlet valve 25, and flows into the wheel cylinders 24 of the first hydraulic pressure circuit 12. As a result, the hydraulic pressure of the brake fluid in the wheel cylinder 24 of the first hydraulic pressure circuit 12 increases.

[0035] Furthermore, when the brake fluid pressure in the wheel cylinders 24 of the second hydraulic pressure circuit 14 is insufficient or there is a possibility of such insufficiency, the control device 110 executes pressure-boosting control to increase the hydraulic pressure of the brake fluid in the wheel cylinders 24 of the second hydraulic pressure circuit 14. In this case, the control device 110 controls the inlet valve 25, the release valve 26, the switching valve 28, and the pressure-boosting valve 29 of the second hydraulic pressure circuit 14 to be de-energized, while driving the motor 90. As a result, the pump 50 driven by the motor 90 causes the brake fluid in the master cylinder 21 of the second hydraulic pressure circuit 14 to flow from the secondary flow path intermediate portion 42a through the main flow path 41 and the pressure-boosting flow path 43 into the secondary flow path 42. The brake fluid that has flowed into the secondary flow path 42 flows from the main flow path intermediate portion 41a into the main flow path 41, passes through the inlet valve 25, and flows into the wheel cylinders 24 of the second hydraulic pressure circuit 14. As a result, the hydraulic pressure of the brake fluid in the wheel cylinder 24 of the second hydraulic circuit 14 increases.

[0036] That is, the hydraulic pressure control unit 100 controls the hydraulic pressure of the brake fluid in the wheel cylinders 24 of the first hydraulic pressure circuit 12, thereby enabling pressure reduction control of the first hydraulic pressure circuit 12 (in other words, anti-lock brake control). The hydraulic pressure control unit 100 also controls the hydraulic pressure of the brake fluid in the wheel cylinders 24 of the second hydraulic pressure circuit 14, thereby enabling pressure reduction control of the second hydraulic pressure circuit 14 (in other words, anti-lock brake control). The hydraulic pressure control unit 100 also controls the hydraulic pressure of the brake fluid in the wheel cylinders 24 of the first hydraulic pressure circuit 12, thereby enabling pressure increase control of the first hydraulic pressure circuit 12. The hydraulic pressure control unit 100 also controls the hydraulic pressure of the brake fluid in the wheel cylinders 24 of the second hydraulic pressure circuit 14, thereby enabling pressure increase control of the second hydraulic pressure circuit 14.

[0037] <Configuration of hydraulic control unit> The configuration of the hydraulic pressure control unit according to this embodiment will be described. Fig. 3 is a cross-sectional view showing the periphery of the pump and motor of the hydraulic control unit according to the embodiment of the present invention. The pump 50 shown in Fig. 3 is the pump 50 of the first hydraulic circuit 12. The configuration of the pump 50 of the second hydraulic circuit 14 is similar to the configuration of the pump 50 of the first hydraulic circuit 12.

[0038] As described above, the hydraulic control unit 100 includes the pump 50 and the motor 90. The pump 50 and the motor 90 are mounted on a base 101 made of a metal such as an aluminum alloy.

[0039] The motor 90 includes an output shaft 91 and an eccentric portion 92. The output shaft 91 is driven to rotate by a rotor and a stator of the motor 90. Note that FIG. 3 is a diagram of the hydraulic control unit 100 cut along a cross section perpendicular to the rotation center of the output shaft 91, and is viewed from a direction in which the rotor and stator are not shown. The eccentric portion 92 is provided on the output shaft 91 and rotates eccentrically about the rotation center of the output shaft 91.

[0040] The pump 50 is provided in a recess 102 provided in a base 101. The pump 50 includes a cylinder 51, a piston portion 55, a holder 85, and the like.

[0041] A compression chamber 52 that compresses brake fluid is formed in the cylinder 51. A discharge passage 53 that discharges the brake fluid compressed in the compression chamber 52 is also formed in the cylinder 51. The brake fluid discharged into the discharge passage 53 flows into the second sub-passage 42c of the sub-passage 42. In this embodiment, the brake fluid discharged into the discharge passage 53 flows into the second sub-passage 42c via a discharge passage 68. That is, the discharge passage 53 communicates with the second sub-passage 42c via the discharge passage 68. In this embodiment, an outlet-side check valve 75 is provided between the discharge passage 68 and the discharge passage 53 to regulate the flow of brake fluid from the discharge passage 68 toward the discharge passage 53.

[0042] Specifically, pump 50 according to this embodiment includes lid portion 67 adjacent to cylinder 51. Lid portion 67 is provided in a region of recess 102 that is closer to the opening of recess 102 than cylinder 51. Discharge flow path 68 is formed between cylinder 51 and lid portion 67. In this embodiment, discharge flow path 68 is composed of a groove formed in at least one of the end of cylinder 51 on the lid portion 67 side and the end of lid portion 67 on the cylinder 51 side, and a groove formed in at least one of the outer circumferential surface of cylinder 51 and the outer circumferential surface of lid portion 67.

[0043] An input side end 55a, which is one end of the piston portion 55, abuts against an eccentric portion 92 of the motor 90. In other words, the input side end 55a is the end that is pressed by the motor 90 via the eccentric portion 92. Furthermore, a compartment side end 55b, which is the other end of the piston portion 55, is inserted into the compression chamber 52. The compartment side end 55b is the end that defines the compression chamber 52. The compartment side end 55b reciprocates within the compression chamber 52. At this time, the outer peripheral surface of the compartment side end 55b slides on the inner peripheral surface of the compression chamber 52.

[0044] The piston portion 55 is formed with an inlet flow passage 65 through which brake fluid flowing through the internal flow passage 40 toward the pump 50 flows and guides the brake fluid to the compression chamber 52. Specifically, in this embodiment, the inlet end of the inlet flow passage 65 for brake fluid flows into the side surface of the piston portion 55. The outlet end of the inlet flow passage 65 for brake fluid flows into the compartment-side end 55b. That is, the outlet end of the inlet flow passage 65 for brake fluid flows into the compression chamber 52. The brake fluid flowing through the first sub-flow passage 42b of the sub-flow passage 42 toward the pump 50 flows into the inlet flow passage 65 and then flows out into the compression chamber 52 through the inlet flow passage 65. In this embodiment, to prevent the brake fluid flowing through the first sub-flow passage 42b of the sub-flow passage 42 toward the pump 50 from flowing through the outer periphery of the piston portion 55 into the space in which the eccentric portion 92 is disposed, the piston portion 55 and the base 101 are sealed with a sealing member 88 such as an O-ring.

[0045] A return spring 66 is provided on the outside of the piston portion 55. The return spring 66 presses the piston portion 55 toward the motor 90. In this embodiment, the return spring 66 presses the piston portion 55 toward the eccentric portion 92 of the motor 90. In other words, the return spring 66 presses the piston portion 55 in the direction from the partition-side end 55b toward the input-side end 55a. Specifically, the return spring 66 is configured to press the piston portion 55 toward the motor 90 as follows: The piston portion 55 has a step portion 64 provided on the outer periphery of the piston portion 55. The return spring 66 abuts against the step portion 64. More specifically, one end of the return spring 66 abuts against the step portion 64. The other end of the return spring 66 abuts against a component that does not move when the pump 50 is operating, such as the cylinder 51. As a result, the step portion 64 is pressed by the return spring 66 in the direction toward the motor 90 , and the piston portion 55 is pressed by the return spring 66 in the direction toward the motor 90 .

[0046] While the number of parts constituting the piston portion 55 is not particularly limited, in the present embodiment, the piston portion 55 is composed of a first piston member 56 and a second piston member 61 connected to the first piston member 56. That is, in the present embodiment, the piston portion 55 includes the first piston member 56 and the second piston member 61, which is a separate member from the first piston member 56. The first piston member 56 is a portion of the piston portion 55 that has an input side end portion 55a. The second piston member 61 is formed, for example, from resin, and is a portion of the piston portion 55 that has a partition side end portion 55b. In the present embodiment, the return spring 66 is provided on the outer side of the second piston member 61 of the piston portion 55. Furthermore, the step portion 64 is provided on the outer periphery of the second piston member 61.

[0047] Furthermore, the number of parts constituting the first piston member 56 is not particularly limited, but in this embodiment, the first piston member 56 is composed of two parts. Specifically, the first piston member 56 includes a first part 57 having an input side end portion 55a, and a second part 58 connected to the first part 57 and the second piston member 61. The parts constituting the first piston member 56 are formed of, for example, resin or metal. Note that some of the parts constituting the first piston member 56 may be formed of resin, and other parts of the parts constituting the first piston member 56 may be formed of metal. For example, the first part 57 may be formed of metal, and the second part 58 may be formed of resin.

[0048] The holder 85 holds a filter 87 through which brake fluid flows into the inlet flow passage 65 formed in the piston portion 55. By including the filter 87 in the holder 85, foreign matter can be prevented from entering the compression chamber 52, and damage to the interior of the compression chamber 52 can be suppressed, thereby improving the reliability of the hydraulic control unit 100. The holder 85 and the filter 87 may be formed separately or integrally. The holder 85 is disposed on the bottom surface 105a side of the recess 102 with respect to the cylinder 51. One end of the holder 85, a base end 85a, is connected to the cylinder 51 and covers a portion of the piston portion 55. Specifically, in this embodiment, a portion of the cylinder 51 is press-fitted into the base end 85a of the holder 85, and the base end 85a of the holder 85 is connected to the cylinder 51. In this embodiment, the holder 85 is configured to also cover the return spring 66.

[0049] Here, the brake system 10 requires an inlet check valve 70 that regulates the flow of brake fluid back from the compression chamber 52 to the internal flow path 40 (specifically, the first sub-flow path 42b). The inlet check valve 70 may be provided in the first sub-flow path 42b, but in this embodiment it is provided in the inlet flow path 65. That is, in this embodiment, the piston 55 is provided with the inlet check valve 70 that is provided in the inlet flow path 65 and regulates the flow of brake fluid from the compression chamber 52 to the internal flow path 40 (specifically, the first sub-flow path 42b). The inlet check valve 70 includes a seat 73 provided in the inlet flow path 65, a ball 71 that abuts against the seat 73 and blocks the inlet flow path 65, and a spring 72 that presses the ball 71 toward the seat 73. By providing the inlet side check valve 70 in the inlet flow path 65, it is possible to prevent foreign matter from getting caught between the ball 71 and the seating portion 73, which would cause the inlet side check valve 70 to malfunction, thereby improving the reliability of the hydraulic control unit 100.

[0050] While there is no particular limitation on the method for fixing the pump 50 configured as described above to the base 101, in this embodiment, the pump 50 is fixed to the base 101 as follows. The base 101 has a step 103 on the inner circumferential surface of the recess 102. The cylinder 51 of the pump 50 has a step 54 that protrudes from the outer circumferential surface and abuts against the step 103 of the base 101. The base 101 also has a plastically deformed portion 104 formed by plastically deforming the periphery of the opening of the recess 102. The lid 67 and the cylinder 51 of the pump 50 are sandwiched between the step 103 and the plastically deformed portion 104, thereby fixing the pump 50 to the base 101. Note that FIG. 3 shows the base 101 before the plastically deformed portion 104 is formed. For this reason, the plastically deformed portion 104 is shown in FIG. 3 by imaginary lines.

[0051] In the pump 50 configured as described above, as the outer peripheral surface of the eccentric portion 92 of the motor 90 approaches the compression chamber 52, the piston portion 55 is pushed toward the compression chamber 52, thereby decreasing the volume of the compression chamber 52. Furthermore, as the outer peripheral surface of the eccentric portion 92 of the motor 90 moves away from the compression chamber 52, the piston portion 55, which is pressed toward the eccentric portion 92 by the return spring 66, maintains a state in which the input end 55a abuts against the eccentric portion 92. As a result, the piston portion 55 moves in accordance with the outer peripheral surface of the eccentric portion 92 of the motor 90, or in other words, moves in accordance with the eccentric rotational motion of the eccentric portion 92 of the motor 90, and operates to move out of the compression chamber 52. Therefore, the volume of the compression chamber 52 increases.

[0052] When brake fluid flows into the first sub-path 42b of the sub-path 42, the brake fluid in the first sub-path 42b flows into the inlet path 65 formed in the piston portion 55. For example, during pressure reduction control, the brake fluid in the wheel cylinder 24 flows into the inlet path 65 through the main path 41 and the first sub-path 42b. Also, during pressure increase control, the brake fluid in the master cylinder 21 flows into the inlet path 65 through the main path 41, the pressure increase path 43, and the first sub-path 42b.

[0053] At this time, when the volume of the compression chamber 52 is increasing, the hydraulic pressure of the brake fluid present on the compression chamber 52 side relative to the inlet check valve 70 is low. Therefore, the brake fluid that has flowed into the inlet flow path 65 moves the ball 71 away from the seat 73, opening the inlet check valve 70. As a result, the brake fluid that has flowed into the inlet flow path 65 flows into the compression chamber 52 through the inlet check valve 70. On the other hand, when the volume of the compression chamber 52 is decreasing, the hydraulic pressure of the brake fluid present on the compression chamber 52 side relative to the inlet check valve 70 increases. Therefore, the brake fluid that has flowed into the inlet flow path 65 cannot move the ball 71 away from the seat 73. As a result, the inlet check valve 70 is closed, and the brake fluid that has flowed into the inlet flow path 65 does not flow into the compression chamber 52.

[0054] The brake fluid that has flowed into the compression chamber 52 is compressed as the volume of the compression chamber 52 decreases. When the hydraulic pressure of the brake fluid in the compression chamber 52 reaches a level sufficient to open the outlet check valve 75, the brake fluid in the compression chamber 52 is pressure-fed to the second sub-path 42c of the sub-path 42 through the discharge path 53 and the discharge path 68. For example, during pressure reduction control, the brake fluid that has flowed into the second sub-path 42c is returned to the master cylinder 21 through the main path 41. During pressure increase control, the brake fluid that has flowed into the second sub-path 42c flows into the wheel cylinder 24 through the main path 41.

[0055] However, straddle-type vehicles, which are one type of vehicle, have less freedom in component layout and less freedom in mounting a hydraulic control unit compared to vehicles such as four-wheeled automobiles. For this reason, there has been a demand for miniaturization of hydraulic control units mounted on straddle-type vehicles. To miniaturize a hydraulic control unit, it is necessary to miniaturize the pump. To miniaturize the pump, it is also necessary to reduce the size of the compression chamber, for example by reducing the diameter of the compression chamber. However, with conventional hydraulic control units, it is difficult to reduce the size of the compression chamber, making it difficult to miniaturize the hydraulic control unit.

[0056] Specifically, the piston of a pump of a conventional hydraulic control unit has a partition portion between its input end and its partition end, the portion of the partition portion being inserted into the compression chamber and having a diameter larger than that of the partition end. The partition portion defines the compression chamber and reciprocates within the compression chamber. Furthermore, in the pump of a conventional hydraulic control unit, some of the pump components, such as a return spring, are located between the outer circumferential surface of the partition end of the piston and the inner circumferential surface of the compression chamber, i.e., within the compression chamber. Therefore, in the pump of a conventional hydraulic control unit, the diameter of the partition portion of the piston must be larger than that of the partition end of the piston to ensure sufficient space for these components. Therefore, it has been difficult to reduce the size of the compression chamber in a conventional hydraulic control unit, making it difficult to miniaturize the hydraulic control unit.

[0057] On the other hand, in hydraulic control unit 100 according to this embodiment, partition-side end portion 55b, which has a smaller diameter than a conventional partition, partitions compression chamber 52. Therefore, hydraulic control unit 100 according to this embodiment can have compression chamber 52 smaller than conventional ones, and hydraulic control unit 100 can be made more compact.

[0058] Here, when the compression chamber 52 is partitioned by the partition-side end 55b of the piston 55, the pump components that were disposed inside the compression chamber in a conventional hydraulic control unit are disposed outside the compression chamber 52, such as in a space surrounded by the holder 85 and the cylinder 51. Therefore, the holder 85 of the hydraulic control unit 100 according to this embodiment may be longer in the direction of reciprocation of the piston 55 (the left-right direction on the paper surface of FIG. 3 ) than the holder of a conventional hydraulic control unit. In such a case, those skilled in the art may be concerned that the holder 85 will not be installed in the recess 102 of the base 101 in a specified orientation, and the pump 50 will not be properly attached to the base 101. However, the hydraulic control unit 100 according to this embodiment can also prevent the holder 85 from being installed in the recess 102 of the base 101 in a specified orientation.

[0059] Specifically, the holder 85 of the hydraulic control unit 100 has an abutment portion 86 that abuts against a wall surface 105 of a recess 102 of the base body 101. The recess 102 has a bottom surface 105a and an inner circumferential surface 105b as the wall surface 105. That is, the holder 85 has an abutment portion 86 that abuts against the bottom surface 105a or the inner circumferential surface 105b of the recess 102. The abutment portion 86 is disposed, for example, at the following position. If the end of the holder 85 opposite the base end 85a is defined as the tip end 85b, the abutment portion 86 is disposed midway between the base end 85a and the tip end 85b. Also, for example, the abutment portion 86 is disposed at the tip end 85b. Note that FIG. 3 shows an example in which the abutment portion 86 is disposed midway between the base end 85a and the tip end 85b.

[0060] Furthermore, the specific configuration in which the abutting portion 86 abuts against the wall surface 105 of the recess 102 is not particularly limited, but the abutting portion 86 abuts against the wall surface 105 of the recess 102, for example, as follows: The recess 102 has a first step portion 106 on the wall surface 105. In this embodiment, the recess 102 has the first step portion 106 on the inner circumferential surface 105b. The abutting portion 86 also has a second step portion 86a. The second step portion 86a abuts against the first step portion 106.

[0061] In the hydraulic control unit 100 according to this embodiment, the holder 85 is supported at both ends by the cylinder 51 and the contact portion of the abutting portion 86 on the wall surface 105 of the recess 102. Therefore, in the hydraulic control unit 100 according to this embodiment, when the pump 50 is installed in the recess 102, the abutting portion 86 abuts against the wall surface 105 of the recess 102, thereby correcting the pump 50's posture. Therefore, the hydraulic control unit 100 according to this embodiment can also prevent the holder 85 from being installed in the recess 102 of the base 101 in a specified posture. That is, the hydraulic control unit 100 according to this embodiment can prevent the pump 50 from being installed incorrectly on the base 101. In particular, the configuration in which the second step 86a of the abutting portion 86 abuts against the first step 106 further enhances the stability of the holder 85 when supported at both ends, thereby more effectively preventing the holder 85 from being installed in the recess 102 of the base 101 in a specified posture.

[0062] Here, it is preferable that the hydraulic pressure control unit 100 according to this embodiment has the following configuration.

[0063] Preferably, the abutting portion 86 is disposed midway between the base end 85a and the tip end 85b. When the abutting portion 86 abuts against the wall surface 105 of the recess 102, a load compressing the holder 85 in the reciprocating direction of the piston portion 55 acts on the region between the base end 85a of the holder 85 and the abutting portion 86. At this time, if the abutting portion 86 is disposed at the tip end 85b, the abutting portion 86 disposed at the tip end 85b is likely to deform under the load. In contrast, if the abutting portion 86 is disposed midway between the base end 85a and the tip end 85b, the abutting portion 86 is closer to the base end 85a than when the abutting portion 86 is disposed at the tip end 85b. Therefore, if the abutting portion 86 is disposed midway between the base end 85a and the tip end 85b, deformation of the holder 85 can be suppressed compared to when the abutting portion 86 is disposed at the tip end 85b. This can further prevent the holder 85 from being unable to be placed in the recess 102 of the base 101 in a specified orientation due to the deformation.

[0064] When the abutting portion 86 is located midway between the base end 85a and the tip end 85b, the abutting portion 86 is preferably located in an area on the base end 85a side with respect to the filter 87. In the hydraulic control unit 100 having such a configuration, the load acting when the abutting portion 86 abuts against the wall surface 105 of the recess 102 does not act on the filter 87, which is easily deformed by the load. Therefore, the hydraulic control unit 100 having such a configuration can further suppress deformation of the holder 85 (particularly deformation of the filter 87). This further suppresses the occurrence of a state in which the holder 85 cannot be installed in the recess 102 of the base 101 in a specified orientation due to the deformation.

[0065] When the abutting portion 86 is located midway between the base end 85a and the tip end 85b, a gap 89 is preferably formed between the holder 85 and the wall surface 105 of the recess 102 in the direction of reciprocation of the piston portion 55 in a region on the tip end 85b side relative to the abutting portion 86. In the hydraulic control unit 100 having such a configuration, a load in the direction of reciprocation of the piston portion 55 is not applied to the region on the tip end 85b side relative to the abutting portion 86. Therefore, the hydraulic control unit 100 having such a configuration can further suppress deformation of the holder 85. This further suppresses the occurrence of a state in which the holder 85 cannot be installed in the recess 102 of the base 101 in a specified orientation due to the deformation. Note that the region on the tip end 85b side relative to the abutting portion 86 may be in contact with the wall surface 105 of the recess 102 in a direction perpendicular to the direction of reciprocation of the piston portion 55.

[0066] <Manufacturing method for hydraulic control unit> A method for manufacturing the hydraulic control unit according to this embodiment will be described below. Note that the following describes a method for attaching the pump 50 to the recess 102 of the base 101.

[0067] Fig. 4 is a flowchart illustrating a method for attaching a hydraulic control unit to a pump base according to an embodiment of the present invention, and Fig. 5 is a cross-sectional view illustrating the periphery of the pump, illustrating a method for attaching a hydraulic control unit to a pump base according to an embodiment of the present invention.

[0068] When the pump 50 is attached to the recess 102 of the base 101, an abutment step, step S1, is first performed. In the abutment step, the pump 50 is inserted into the recess 102 in an orientation in which the holder 85 is disposed on the bottom surface 105a side of the recess 102 relative to the cylinder 51, and the abutment portion 86 of the holder 85 is abutted against the wall surface 105 of the recess 102. Note that, at the abutment step, the press-fit depth of the cylinder 51 into the base end portion 85a of the holder 85 is shallower than the press-fit depth after the pump 50 has been attached to the recess 102. Therefore, as shown in FIG. 5(a), when the abutment step is completed, the step 54 of the cylinder 51 has not yet abutted against the step 103 of the recess 102.

[0069] Step S2 after the abutting step is a pushing step. In the pushing step, the pump 50 is pushed further into the recess 102. As a result, as shown in FIG. 5(b), the cylinder 51 is press-fitted into the base end 85a of the holder 85, and the step 54 of the cylinder 51 abuts against the step 103 of the recess 102. Step S3 after the pushing step is a fixing step. In the fixing step, the periphery of the opening of the recess 102 is plastically deformed to form a plastically deformed portion 104, and the lid 67 and the cylinder 51 of the pump 50 are sandwiched between the step 103 and the plastically deformed portion 104. This fixes the pump 50 to the recess 102, completing the installation of the pump 50 in the recess 102.

[0070] <Modification> FIG. 6 is a diagram showing a modified example of the hydraulic control unit according to the embodiment of the present invention, and is a cross-sectional view showing the periphery of the pump and the motor. 3 described above, an example in which the second step 86a of the abutting portion 86 abuts against the first step 106 of the wall surface 105 of the recessed portion 102 has been described as an example of a configuration in which the abutting portion 86 abuts against the wall surface 105 of the recessed portion 102. In this case, in FIG. 3 described above, the abutting surfaces of the first step 106 and the second step 86a are surfaces perpendicular to the direction of reciprocation of the piston portion 55. However, this is not limiting, and the abutting surfaces of the first step 106 and the second step 86a may be surfaces that are inclined obliquely with respect to the direction of reciprocation of the piston portion 55, as shown in FIG. 6. Even in a hydraulic control unit 100 in which the first step 106 and the second step 86a are configured in this manner, the holder 85 is supported at both ends by the cylinder 51 and the abutting point of the wall surface 105 of the recessed portion 102 where the abutting portion 86 abuts against the abutting portion 86. Therefore, even in the hydraulic control unit 100 in which the first step portion 106 and the second step portion 86a are configured in this manner, it is possible to prevent the holder 85 from being placed in the recess 102 of the base body 101 in a specified orientation.

[0071] FIG. 7 is a diagram showing a modified example of the hydraulic control unit according to the embodiment of the present invention, and is a cross-sectional view showing the periphery of the pump and the motor. 3, the abutment portion 86 is disposed midway between the base end portion 85a and the tip end portion 85b of the holder 85. However, this is not limiting, and as described above and as shown in FIG. 7, the abutment portion 86 may be disposed at the tip end portion 85b of the holder 85. In the hydraulic control unit 100 configured in this manner, the holder 85 is also supported at both ends, by the abutment portion with the abutment portion 86 on the wall surface 105 of the recess 102 and by the cylinder 51. Therefore, in the hydraulic control unit 100 configured in this manner, it is possible to prevent the holder 85 from being installed in the recess 102 of the base 101 in a specified orientation.

[0072] <Effects of the hydraulic control unit> The effects of the hydraulic pressure control unit according to this embodiment will be described.

[0073] The hydraulic control unit 100 according to this embodiment is a hydraulic control unit for a brake system 10 mounted on a saddle-ride type vehicle 200. The hydraulic control unit 100 includes a base 101 having an internal flow path 40 that connects the wheel cylinders 24 and the master cylinder 21, and a pump 50 that moves brake fluid through the internal flow path 40. The base 101 includes a recess 102 in which the pump 50 is disposed. The pump 50 includes a cylinder 51 having a compression chamber 52 that compresses the brake fluid, and a piston 55 having an input end 55a at one end pressed by a motor 90 that serves as a drive source for the pump 50 and a partition end 55b at the other end inserted into the compression chamber 52 to define the compression chamber 52, the partition end 55b reciprocating within the compression chamber 52. The piston 55 is formed with an inflow flow path 65 through which brake fluid flowing through the internal flow path 40 toward the pump 50 flows and guides the brake fluid to the compression chamber 52. The pump 50 also includes a holder 85 that holds a filter 87 through which brake fluid flows into the inlet flow path 65. The holder 85 is disposed on the bottom surface 105a side of the recess 102 with respect to the cylinder 51, and has a base end 85a, which is one end of the holder 85, connected to the cylinder 51, covering part of the piston 55, and including an abutting portion 86 that abuts against the wall surface 105 of the recess 102.

[0074] As described above, the hydraulic control unit 100 configured in this manner can be made smaller than conventional hydraulic control units, and can also prevent the holder 85 from being installed in the recess 102 of the base 101 in the specified orientation.

[0075] The hydraulic control unit 100 according to this embodiment has been described above, but the hydraulic control unit according to the present invention is not limited to the description of this embodiment. The hydraulic control unit according to the present invention may implement only a part of this embodiment. For example, the hydraulic control unit according to the present invention may be configured not to perform the above-described pressure increase control. In this case, the hydraulic control unit according to the present invention does not include the switching valve 28, the pressure increase valve 29, and the pressure increase flow path 43, which are necessary for pressure increase control. [Explanation of symbols]

[0076] 1 fuselage, 2 handle, 3 front wheel, 3a rotor, 4 rear wheel, 4a rotor, 10 brake system, 11 brake lever, 12 first hydraulic circuit, 13 brake pedal, 14 second hydraulic circuit, 15 fluid pipe, 16 fluid pipe, 21 master cylinder, 22 reservoir, 23 brake caliper, 24 wheel cylinder, 25 inlet valve, 26 release valve, 27 accumulator, 28 switching valve, 29 booster valve, 30 master cylinder fluid pressure sensor, 31 wheel cylinder fluid pressure sensor, 40 internal flow path, 41 main flow path, 41a main flow path intermediate portion, 42 secondary flow path, 42a secondary flow path intermediate portion, 42b first secondary flow path, 42c second secondary flow path, 43 booster flow path, 50 pump, 51 cylinder, 52 compression chamber, 53 discharge flow path, 54 step portion, 55 Piston portion, 55a input side end portion, 55b compartment side end portion, 56 first piston member, 57 first part, 58 second part, 61 second piston member, 64 step portion, 65 inlet flow passage, 66 return spring, 67 lid portion, 68 discharge flow passage, 70 inlet side check valve, 71 ball, 72 spring, 73 seat portion, 75 outlet side check valve, 85 holder, 85a base end portion, 85b tip portion, 86 abutment portion, 86a second step portion, 87 filter, 88 seal member, 89 gap, 90 motor, 91 output shaft, 92 eccentric portion, 100 hydraulic pressure control unit, 101 base body, 102 recess, 103 step portion, 104 plastically deformed portion, 105 wall surface, 105a bottom surface, 105b inner peripheral surface, 106 First stage, 110 control device, 200 saddle-type vehicle, MP master cylinder port, WP wheel cylinder port.

Claims

1. A hydraulic pressure control unit (100) for a brake system (10) mounted on a saddle-ride type vehicle (200), comprising: a base body (101) in which an internal flow path (40) that connects a wheel cylinder (24) and a master cylinder (21) is formed; a pump (50) for moving brake fluid through the internal flow path (40); Equipped with The base (101) has a recess (102) in which the pump (50) is provided, The pump (50) a cylinder (51) in which a compression chamber (52) for compressing brake fluid is formed; a piston portion (55) having an input side end (55a) at one end pressed by a motor (90) that is a drive source of the pump (50) and a partition side end (55b) at the other end inserted into the compression chamber (52) to partition the compression chamber (52), the partition side end (55b) reciprocating within the compression chamber (52); Equipped with The piston portion (55) is formed with an inflow flow path (65) through which brake fluid that has flowed through the internal flow path (40) toward the pump (50) flows and which guides the brake fluid to the compression chamber (52). The pump (50) includes a holder (85) that holds a filter (87) through which brake fluid flows into the inlet flow path (65), The holder (85) is The cylinder (51) is disposed on the bottom surface (105a) side of the recess (102) based on the cylinder (51), One end, that is, a base end portion (85a), is connected to the cylinder (51) and covers a part of the piston portion (55); The recess (102) has a contact portion (86) that contacts the wall surface (105). Hydraulic control unit (100).

2. When the end portion of the holder (85) opposite to the base end portion (85a) is the tip end portion (85b), The abutment portion (86) is disposed midway between the base end portion (85a) and the tip end portion (85b). The hydraulic control unit (100) of claim 1.

3. The abutment portion (86) is disposed in a region on the base end portion (85a) side with respect to the filter (87). The hydraulic control unit (100) of claim 2.

4. In a region on the tip end portion (85b) side with respect to the abutment portion (86), a gap (89) is formed between the holder (85) and the wall surface (105) of the recess (102) in the reciprocating direction of the piston portion (55). A hydraulic control unit (100) according to claim 2 or claim 3.

5. When the end portion of the holder (85) opposite to the base end portion (85a) is the tip end portion (85b), The abutment portion (86) is disposed on the tip portion (85b). The hydraulic control unit (100) of claim 1.

6. The recess (102) has a first step (106) on the wall surface (105), The abutment portion (86) includes a second step portion (86a), The second step portion (86a) abuts against the first step portion (106). A hydraulic control unit (100) according to any one of claims 1 to 3.

7. The pump further includes a return spring (66) provided on the outside of the piston portion (55) and pressing the piston portion (55) toward the motor (90). A hydraulic control unit (100) according to any one of claims 1 to 3.

8. The piston portion (55) is provided in the inlet flow path (65) and includes an inlet-side check valve (70) that regulates the flow of brake fluid from the compression chamber (52) toward the internal flow path (40). A hydraulic control unit (100) according to any one of claims 1 to 3.

9. The hydraulic control unit (100) according to any one of claims 1 to 3 is provided. Saddle-type vehicle (200).

10. A method for manufacturing a hydraulic control unit (100) of a brake system (10) mounted on a saddle-ride type vehicle (200), comprising: The hydraulic control unit (100) a base body (101) in which an internal flow path (40) that connects a wheel cylinder (24) and a master cylinder (21) is formed; a pump (50) for moving brake fluid through the internal flow path (40); Equipped with The base (101) has a recess (102) in which the pump (50) is provided, The pump (50) a cylinder (51) in which a compression chamber (52) for compressing brake fluid is formed; a piston portion (55) having an input side end (55a) at one end pressed by a motor (90) that is a drive source of the pump (50) and a partition side end (55b) at the other end inserted into the compression chamber (52) to partition the compression chamber (52), the partition side end (55b) reciprocating within the compression chamber (52); Equipped with The piston portion (55) is formed with an inflow flow path (65) through which brake fluid that has flowed through the internal flow path (40) toward the pump (50) flows and which guides the brake fluid to the compression chamber (52). The pump (50) includes a holder (85) that holds a filter (87) through which brake fluid flows into the inlet flow path (65), The holder (85) has a base end (85a) connected to the cylinder (51) and covering a part of the piston portion (55). and an abutting step (S1) of inserting the pump (50) into the recess (102) in a position where the holder (85) is disposed on the bottom surface (105a) side of the recess (102) with the cylinder (51) as a reference, and abutting the abutting portion (86) of the holder (85) against the wall surface (105) of the recess (102). A method for manufacturing a hydraulic control unit (100).

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