JP2022057144A - Liquid pressure generator - Google Patents

Abstract

To provide a liquid pressure generator that can simplify work for assembling a driving transmission mechanism and suppress component costs of the driving transmission mechanism.SOLUTION: The liquid pressure generator comprises a driving transmission mechanism 30 that converts rotary driving force of a motor to force for pushing a piston. The driving transmission mechanism 30 comprises a ball screw mechanism provided between a rod 31 and a nut member 32, and a driven-side pulley 40 (a rotating body). A key member 45 is inserted into a first groove 32a of the nut member 32 and a second key groove 42 of the driven-side pulley 40. Both key grooves 32a and 42 are blocked with a clip 43 assembled into the nut member 32. The driven-side pulley 40 is provided with a positioning part 46A that positions the clip 43. The positioning part 46A comprises a dented part 47a having an outer peripheral part of the clip 43 penetrated thereinto and a recessed part 47b having both end parts of the clip 43 penetrated thereinto.SELECTED DRAWING: Figure 3

Description

The present invention relates to a hydraulic pressure generator used in a vehicle brake system.

The hydraulic pressure generator that generates the brake hydraulic pressure according to the stroke amount (operation amount) of the brake pedal includes a master cylinder connected to the brake pedal, a stroke simulator that applies a pseudo operation reaction force to the brake pedal, and a stroke simulator. Is equipped with.
Further, the hydraulic pressure generator includes a motor, a slave cylinder that generates brake fluid pressure by a piston, and a drive transmission mechanism that converts the rotational driving force of the output shaft of the motor into a force that pushes the piston.

The drive transmission mechanism includes a rod in contact with the piston, a cylindrical nut member surrounding the rod, a ball screw mechanism provided between the rod and the nut member, and rotation in conjunction with the output shaft. Some of them are provided with a pulley (see, for example, Patent Document 1).
In the drive transmission mechanism described above, the nut member is inserted into the pulley, and the key member is inserted into the first key groove formed on the outer peripheral surface of the nut member and the second key groove formed on the inner peripheral surface of the pulley. By inserting, the nut member and the pulley are connected in the rotation direction.

Japanese Unexamined Patent Publication No. 2016-08827

In the drive transmission mechanism of the conventional hydraulic pressure generator described above, two bearings are externally fitted to the nut member, and the key member is sandwiched between the two bearings to prevent the key member from coming off from both key grooves. There is. In this configuration, since it is necessary to assemble the two bearings to the nut member, there is a problem that the assembly work of the drive transmission mechanism becomes complicated and the cost of parts of the drive transmission mechanism increases.

An object of the present invention is to provide a hydraulic pressure generator capable of simplifying the assembly work of the drive transmission mechanism and suppressing the cost of parts of the drive transmission mechanism.

In order to solve the above problems, the present invention is a hydraulic pressure generator, in which a motor, a slave cylinder that generates brake fluid pressure by a piston, and a rotational driving force of an output shaft of the motor are used as a force for pushing the piston. It is equipped with a drive transmission mechanism that converts. The drive transmission mechanism is a ball provided between a rod in contact with the piston, a cylindrical nut member surrounding the rod, and an outer peripheral surface of the rod and an inner peripheral surface of the nut member. It includes a screw mechanism and a cylindrical rotating body that rotates in conjunction with the output shaft. The nut member is inserted into the rotating body, and an end portion of the nut member protrudes from one side surface of the rotating body. The first key groove formed on the outer peripheral surface of the nut member and the second key groove formed on the inner peripheral surface of the rotating body communicate with each other, and the key member is formed in the first key groove and the second key groove. Is inserted. The inner peripheral portion of the C-shaped clip is fitted into the clip mounting groove formed on the outer peripheral surface of the end portion of the nut member, and the opening on one side of the first key groove and the second key groove is the clip. It is blocked by. A positioning portion for positioning the clip is provided on one side surface of the rotating body. The positioning portion includes a recessed portion into which the outer peripheral portion of the clip is inserted, and a recessed portion formed on the outside of the recessed portion. The recess has two protrusions protruding outward in the radial direction from both ends of the clip.

Further, in order to solve the above-mentioned problems, the present invention is a hydraulic pressure generator, in which a motor, a slave cylinder for generating brake fluid pressure by a piston, and a rotational driving force of an output shaft of the motor push the piston. It is equipped with a drive transmission mechanism that converts it into force. The drive transmission mechanism is a ball provided between a rod in contact with the piston, a cylindrical nut member surrounding the rod, and an outer peripheral surface of the rod and an inner peripheral surface of the nut member. It includes a screw mechanism and a cylindrical rotating body that rotates in conjunction with the output shaft. The nut member is inserted into the rotating body, and an end portion of the nut member protrudes from one side surface of the rotating body. The first key groove formed on the outer peripheral surface of the nut member and the second key groove formed on the inner peripheral surface of the rotating body communicate with each other, and the key member is formed in the first key groove and the second key groove. Is inserted. The inner peripheral portion of the C-shaped clip is fitted into the clip mounting groove formed on the outer peripheral surface of the end portion of the nut member, and the opening on one side of the first key groove and the second key groove is the clip. It is blocked by. A positioning portion for positioning the clip is provided on one side surface of the rotating body. The positioning portion includes a convex portion formed on one side surface of the rotating body, and the convex portion is arranged between both ends of the clip.

In the hydraulic pressure generator described above, the positioning portion includes a recessed portion formed on one side surface of the rotating body, and the outer peripheral portion of the clip is inserted into the recessed portion, and the convex portion is formed in the recessed portion. The portion may be formed.

In the hydraulic pressure generator of the present invention, since the key member is prevented from coming off from both key grooves by the C-shaped clip attached to the end of the nut member, the assembly work of the drive transmission mechanism is simplified and the assembly work is simplified. The cost of parts for the drive transmission mechanism can be reduced.

In the hydraulic pressure generator of the present invention, the clip is positioned on the side surface of the rotating body by the positioning portion, and the orientation of the clip in the circumferential direction is also determined by the positioning portion. As a result, when the clip is attached to the nut member and the rotating body, both key grooves can be inevitably closed by the clip.

In the hydraulic pressure generator described above, one side surface in the clip mounting groove is inclined so as to approach the other side surface from the opening edge of the clip mounting groove toward the bottom surface, and the outer peripheral portion of the clip is the rotating body. It is preferable to press it against.

In this configuration, when the inner peripheral portion of the clip is fitted into the clip mounting groove, the clip is guided to the other side surface of the clip mounting groove and moves toward the rotating body, and the outer peripheral portion of the clip is pressed against the rotating body. As a result, the rotating body can be suppressed from moving with respect to the nut member, so that the vibration of the hydraulic pressure generator can be reduced.

In the hydraulic pressure generator of the present invention, the assembly work of the drive transmission mechanism can be simplified and the cost of parts of the drive transmission mechanism can be suppressed. Further, in the hydraulic pressure generator of the present invention, when the clip is attached to the nut member and the rotating body, both key grooves can be inevitably closed by the clip.

It is an overall block diagram which showed the hydraulic pressure generator which concerns on 1st Embodiment of this invention. It is a side sectional view which showed the slave cylinder and the drive transmission mechanism of the hydraulic pressure generator which concerns on 1st Embodiment of this invention. It is a perspective view which showed the drive transmission mechanism of the hydraulic pressure generator which concerns on 1st Embodiment of this invention. It is a figure which looked at the drive transmission mechanism of the hydraulic pressure generator which concerns on 1st Embodiment of this invention from the proximal end side. It is a side sectional view which showed the connection structure of the nut member of the hydraulic pressure generator which concerns on 1st Embodiment of this invention, and a driven side pulley. It is an exploded perspective view which showed the drive transmission mechanism of the hydraulic pressure generator which concerns on 1st Embodiment of this invention. It is a figure which looked at the state before attaching the clip in the drive transmission mechanism of the hydraulic pressure generator which concerns on 1st Embodiment of this invention from the base end side. It is a figure which looked at the drive transmission mechanism of the hydraulic pressure generator which concerns on 2nd Embodiment of this invention from the proximal end side. It is a figure which looked at the drive transmission mechanism of the hydraulic pressure generator which concerns on 3rd Embodiment of this invention from the proximal end side.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the description of each embodiment, the same components are designated by the same reference numerals, and duplicate description will be omitted.
In the present embodiment, a case where the hydraulic pressure generator of the present invention is applied to a vehicle brake system will be described as an example.

[First Embodiment]
As shown in FIG. 1, the vehicle brake system A has a By Wire type brake system that operates when a prime mover (engine, electric motor, etc.) is started, and a hydraulic type that operates when the prime mover is stopped. It is equipped with both brake systems.

The vehicle brake system A can be mounted on a hybrid vehicle that also uses a motor, an electric vehicle / fuel cell vehicle that uses only the motor as a power source, and a vehicle that uses only an engine (internal engine) as a power source.

The vehicle brake system A includes a hydraulic pressure generator 1 that generates brake fluid pressure according to the stroke amount (operation amount) of the brake pedal BP (brake operator) and supports stabilization of vehicle behavior. ..
The hydraulic pressure generator 1 includes a substrate 100, a master cylinder 10, a stroke simulator 50, a slave cylinder 20, an electronic control device 90, and a hydraulic pressure control device 60.

The base 100 is a metal block mounted on a vehicle, and inside the base 100, a bottomed cylindrical first cylinder hole 11, a second cylinder hole 21, a third cylinder hole 51, and a plurality of hydraulic paths are formed. 2a, 2b, 3, 4 and the like are formed.

The master cylinder 10 generates brake fluid pressure according to the stroke amount of the brake pedal BP.
The master cylinder 10 of the first embodiment is a tandem piston type, and has two first pistons 12 and 12 inserted in the first cylinder hole 11 and two coil springs 13 housed in the first cylinder hole 11. , 13, and. Two pressure chambers are formed in the first cylinder hole 11. The coil spring 13 pushes the first piston 12 that has moved to the bottom surface side of the first cylinder hole 11 back to the opening side.

The brake rod R of the brake pedal BP is inserted into the first cylinder hole 11 and is connected to the first piston 12 on the opening side. As a result, both the first pistons 12 and 12 slide in the first cylinder hole 11 by receiving the pedaling force of the brake pedal BP, and pressurize the brake fluid in the first cylinder hole 11.

The stroke simulator 50 applies a pseudo operation reaction force to the brake pedal BP.
The stroke simulator 50 is housed between the third piston 52 inserted into the third cylinder hole 51, the lid member 54 that closes the opening of the third cylinder hole 51, and the third piston 52 and the lid member 54. The coil spring 53 and the cylinder spring 53 are provided.
The third cylinder hole 51 leads to the first cylinder hole 11 via the branch hydraulic passage 3 and the second main hydraulic passage 2b, which will be described later.

As shown in FIG. 2, the slave cylinder 20 uses the motor 24 as a drive source to generate brake fluid pressure.
The slave cylinder 20 of the first embodiment is a single piston type, and has a second piston 22 inserted in the cylinder hole 21, a coil spring 23 housed in the second cylinder hole 21, a motor 24, and drive transmission. It is provided with a mechanism 30 and.

A coil spring 23 is housed in a pressure chamber between the bottom surface of the second cylinder hole 21 and the second piston 22. The coil spring 23 pushes the second piston 22 that has moved to the bottom surface side back to the opening side.

The motor 24 is an electric servomotor that is driven and controlled by the electronic control device 90. The output shaft 24a protrudes from the base end surface of the motor 24.
The motor 24 is attached to the tip surface 101a of the flange portion 101 of the substrate 100. The output shaft 24a projects toward the proximal end side of the flange portion 101 through the insertion hole 101c formed in the flange portion 101.
A drive-side pulley 25 is attached to the base end of the output shaft 24a. On the outer peripheral surface of the drive-side pulley 25, a tooth surface that engages with the inner peripheral surface of the belt 34, which will be described later, is formed.

The drive transmission mechanism 30 is a mechanism that converts the rotational drive force of the output shaft 24a into a force (axial force in the linear direction) that pushes the second piston 22.
The drive transmission mechanism 30 includes a rod 31, a nut member 32 surrounding the rod 31, and a ball screw mechanism 33 provided between the rod 31 and the nut member 32. Further, the drive transmission mechanism 30 includes a driven side pulley 40 connected to the nut member 32, an endless belt 34 hung on the driven side pulley 40 and the drive side pulley 25, and a cover member 35. ..

The rod 31 is inserted into the second cylinder hole 21. The tip of the rod 31 is in contact with the second piston 22. The base end portion of the rod 31 protrudes from the second cylinder hole 21.

The nut member 32 is a cylindrical member arranged in the second cylinder hole 21 and surrounds the rod 31. The outer peripheral surface of the nut member 32 is attached to the inner peripheral surface of the second cylinder hole 21 via the bearing 36. The nut member 32 is rotatable around the axis of the second cylinder hole 21.

A ball screw mechanism 33 is provided between the outer peripheral surface of the rear portion of the rod 31 and the inner peripheral surface of the nut member 32.
The ball screw mechanism 33 converts the rotational motion of the nut member 32 into the linear motion of the rod 31. The ball screw mechanism 33 has a thread groove formed on the outer peripheral surface of the rod 31, a holding groove formed on the inner peripheral surface of the nut member 32, and a plurality of balls inserted between the holding groove and the thread groove (FIG. FIG. Not shown) and.

As shown in FIG. 3, the driven side pulley 40 is a cylindrical member. A tooth surface that engages with the inner peripheral surface of the belt 34 is formed on the outer peripheral surface of the driven side pulley 40.
As shown in FIG. 2, the base end portion of the nut member 32 is inserted into the center hole 41 of the driven side pulley 40. The driven side pulley 40 and the nut member 32 are restricted from rotating in the circumferential direction by the key member 45. As a result, the driven side pulley 40 rotates in conjunction with the nut member 32.

The drive-side pulley 25, the driven-side pulley 40, and the belt 34 are housed in a cover member 35 attached to the proximal end surface 100b of the substrate 100 and the proximal end surface 101b of the flange portion 101.

In the drive transmission mechanism 30, when the output shaft 24a rotates, the rotational driving force is input to the nut member 32 via the drive side pulley 25, the belt 34, and the driven side pulley 40.
When the nut member 32 rotates in the forward direction, the rod 31 is pushed forward by the ball screw mechanism 33. As a result, the second piston 22 receives the input from the rod 31 and slides in the second cylinder hole 21 toward the bottom surface side to pressurize the brake fluid in the pressure chamber.
Further, when the nut member 32 rotates in the reverse direction, the rod 31 is pushed out toward the opening side of the second cylinder hole 21 by the ball screw mechanism 33. As a result, the second piston 22 is pushed back toward the opening side of the second cylinder hole 21 by the coil spring 23, and the brake fluid in the pressure chamber is depressurized.

Next, each hydraulic path formed in the substrate 100 will be described.
As shown in FIG. 1, the two main hydraulic paths 2a and 2b are hydraulic paths starting from the first cylinder hole 11 of the master cylinder 10.
The first main hydraulic passage 2a leads from the pressure chamber on the bottom surface side of the master cylinder 10 to the wheel cylinders W and W of the two wheel brakes via the hydraulic pressure control device 60.
The second main hydraulic passage 2b leads from the pressure chamber on the opening side of the master cylinder 10 to the wheel cylinders W and W of the other two wheel brakes via the hydraulic pressure control device 60.

The branch hydraulic passage 3 is a hydraulic passage from the pressure chamber of the third cylinder hole 51 of the stroke simulator 50 to the second main hydraulic passage 2b. A normally closed solenoid valve V3 is provided in the branch hydraulic passage 3. The normally closed solenoid valve V3 opens and closes the branch hydraulic passage 3.
The communication passage 4 is a hydraulic passage from the pressure chamber of the second cylinder hole 21 to the first main hydraulic passage 2a and the second main hydraulic passage 2b.

A first switching valve V1 which is a three-way valve is provided at a connecting portion between the first main hydraulic passage 2a and the communication passage 4. The first switching valve V1 is a solenoid valve with two positions and three ports.
When the first switching valve V1 is in the first position, the upstream side (master cylinder 10 side) and the downstream side (hydraulic pressure control device 60 side) of the first main hydraulic path 2a communicate with each other, and the first main hydraulic pressure is reached. The road 2a and the communication passage 4 are blocked.
When the first switching valve V1 is in the second position, the upstream side and the downstream side of the first main hydraulic passage 2a are cut off, and the communication passage 4 and the downstream side of the first main hydraulic passage 2a communicate with each other.

A second switching valve V2, which is a three-way valve, is provided at a connecting portion between the second main hydraulic passage 2b and the communication passage 4. The second switching valve V2 is a solenoid valve with 2 positions and 3 ports.
When the second switching valve V2 is in the first position, the upstream side (master cylinder 10 side) and the downstream side (hydraulic pressure control device 60 side) of the second main hydraulic path 2b communicate with each other, and the second main hydraulic pressure is reached. The road 2b and the communication passage 4 are blocked.
When the second switching valve V2 is in the second position, the upstream side and the downstream side of the second main hydraulic passage 2b are cut off, and the communication passage 4 and the downstream side of the second main hydraulic passage 2b communicate with each other.

The electronic control device 90 is attached to the outer surface of the substrate 100. The electronic control device 90 controls the operation of the motor 24 and the opening / closing of each valve based on the information obtained from various sensors, a program stored in advance, and the like.

The hydraulic pressure control device 60 appropriately controls the hydraulic pressure of the brake fluid acting on each wheel cylinder W to support the stabilization of vehicle behavior. Each wheel cylinder W is connected to the hydraulic pressure control device 60 via a pipe.
The hydraulic pressure control device 60 executes control such as anti-lock brake control by increasing, holding, or reducing the hydraulic pressure of the brake fluid acting on each wheel cylinder W.

Next, the operation of the vehicle brake system A will be outlined.
In the vehicle brake system A, when the system is activated, the first switching valve V1 and the second switching valve V2 are excited to switch from the first position to the second position. As a result, the master cylinder 10 and each wheel cylinder W are cut off, and the slave cylinder 20 and each wheel cylinder W communicate with each other.

Further, when the system is started, the normally closed solenoid valve V3 of the branch hydraulic passage 3 is opened. As a result, the hydraulic pressure generated in the master cylinder 10 by operating the brake pedal BP is not transmitted to each wheel cylinder W, but is transmitted to the stroke simulator 50. Then, the third piston 52 moves against the urging force of the coil spring 53, so that the stroke of the brake pedal BP is allowed, and a pseudo operation reaction force is applied to the brake pedal BP.

When the stroke sensor (not shown) detects that the brake pedal BP is depressed, the electronic control device 90 drives the motor 24, and the second piston 22 of the slave cylinder 20 moves to move the second piston 22 in the slave cylinder 20. Brake fluid is pressurized. The hydraulic pressure of the brake fluid generated in the slave cylinder 20 is input to the hydraulic pressure control device 60.
Further, when the brake pedal BP is released from being depressed, the motor 24 is reversely driven by the electronic control device 90, and the brake fluid in the slave cylinder 20 is depressurized.

The hydraulic pressure control device 60 controls the open / closed state of each valve to increase, hold, or reduce the hydraulic pressure acting on each wheel cylinder W, thereby stabilizing vehicle behavior such as anti-lock brake control. Perform controls to assist.

Next, the connection structure between the nut member 32 and the driven side pulley 40 in the drive transmission mechanism 30 of the first embodiment will be described.
As shown in FIG. 6, a first key groove 32a is formed at the upper end of the base end portion of the nut member 32. The first keyway 32a is a recess extending in the axial direction of the nut member 32.
A second key groove 42 is formed on the inner peripheral surface of the center hole 41 of the driven side pulley 40. The second keyway 42 is a recess extending in the axial direction of the driven pulley 40 (see FIG. 5).

As shown in FIG. 7, the first key groove 32a and the second key groove 42 are formed to have the same width. The first key groove 32a and the second key groove 42 face each other in the vertical direction, and the internal space of the first key groove 32a and the internal space of the second key groove 42 communicate with each other. That is, one hole is formed by the first key groove 32a and the second key groove 42.

A rectangular parallelepiped key member 45 (see FIG. 6) is inserted into the first key groove 32a and the second key groove 42. The key member 45 of the first embodiment is fitted in the first key groove 32a and the second key groove 42, and is housed in the first key groove 32a and the second key groove 42.
The lower portion of the key member 45 is fitted into the first key groove 32a of the nut member 32. The upper portion of the key member 45 is fitted into the first key groove 32a of the nut member 32 of the driven side pulley 40.

The key member 45 described above is inserted into the first key groove 32a and the second key groove 42 from the opening on the proximal end side, and the key member 45 is fitted into the first key groove 32a and the second key groove 42. Therefore, the relative rotation of the nut member 32 and the driven side pulley 40 in the circumferential direction is restricted. As a result, the nut member 32 and the driven side pulley 40 are connected in the rotational direction by the key member 45, and rotate in conjunction with the axis.

As shown in FIG. 5, a clip mounting groove 32b having a rectangular shaft cross section is formed on the outer peripheral surface of the base end portion of the nut member 32. The clip mounting groove 32b projects toward the proximal end side of the proximal end surface 40b of the driven side pulley 40.
As shown in FIG. 7, the clip mounting groove 32b extends over the entire circumference of the nut member 32 and communicates with the first key groove 32a.

As shown in FIG. 5, the side surface 32c on the tip end side in the clip mounting groove 32b is formed perpendicular to the axial direction of the nut member 32.
The side surface 32d on the base end side in the clip mounting groove 32b is inclined so as to approach the side surface 32c on the tip side toward the bottom surface from the opening edge (outer peripheral edge) of the clip mounting groove 32b. That is, the clip mounting grooves 32b are formed so as to be closely spaced from the opening toward the bottom. The bottom portion of the clip mounting groove 32b is closer to the tip end side than the opening portion.

As shown in FIG. 3, the inner peripheral portion of the C-shaped clip 43 is fitted in the clip mounting groove 32b. The clip 43 is a snap ring that constitutes a retaining mechanism for the driven side pulley 40 with respect to the nut member 32.
As shown in FIG. 6, two protrusions 43c and 43c protruding outward in the radial direction are formed at both ends of the clip 43, respectively. A circular hole 43d penetrates the protrusion 43c.

When assembling the clip 43 to the clip mounting groove 32b, the tip of the pliers is inserted into the holes 43d and 43d of the protrusions 43c and 43c, respectively, and the tip of the pliers is opened to expand the diameter of the clip 43. Then, the clip 43 is fitted to the nut member 32 in a state where the diameter is expanded, and the diameter of the clip 43 is reduced so that the inner peripheral portion of the clip 43 is fitted into the clip mounting groove 32b as shown in FIG. Can be done.

As shown in FIG. 5, the inner peripheral portion of the base end surface 43b of the clip 43 is inclined so as to approach the tip surface 43a from the outer peripheral side to the inner peripheral side.
When the inner peripheral portion of the clip 43 is fitted into the clip mounting groove 32b, the clip 43 is guided to the inclined surface of the inner peripheral portion of the clip 43 and the side surface 32d on the base end side of the clip mounting groove 32b, and the clip 43 is moved to the tip side. Moving. As a result, the outer peripheral portion of the tip surface 43a of the clip 43 is pressed against the driven side pulley 40.
Then, the driven side pulley 40 is sandwiched between the bearing 36 and the clip 43. In this way, the driven pulley 40 is axially positioned with respect to the nut member 32.

As shown in FIG. 3, a positioning portion 46A for positioning the clip 43 in the circumferential direction is provided on the base end surface 40b of the driven side pulley.
As shown in FIG. 7, the positioning portion 46A includes a recess portion 47a formed around the center hole 41 and a recess 47b formed outside the recess portion 47a, and the recess portion 47a and the recess 47b are provided. Communicat.
The recessed portion 47a is formed in a ring shape along the outer peripheral edge portion of the central hole 41. As shown in FIG. 4, the recessed portion 47a is a recessed portion into which the outer peripheral portion of the clip 43 enters. Therefore, the width and depth of the recessed portion 47a are set according to the shape of the clip 43.

At the lower end of the recess 47a, a recess 47b is formed so as to project outward in the radial direction of the recess 47a. The recess 47b is a portion where both protrusions 43c and 43c of the clip 43 enter. With the clip 43 expanded in diameter, the width of the recess 47b in the circumferential direction is set so that both protrusions 43c and 43c fit within the recess 47b.
Then, the clip 43 is positioned in the circumferential direction with respect to the driven side pulley 40 by the both protrusions 43c and 43c of the clip 43 entering the recess 47b.

When both protrusions 43c and 43c of the clip 43 are positioned in the circumferential direction by the positioning portion 46A, a part of the opening on the proximal end side of the hole formed by the first key groove 32a and the second key groove 42. Is blocked by the upper end of the clip 43. As a result, as shown in FIG. 5, the key member 45 is prevented from coming off with respect to the first key groove 32a and the second key groove 42.

In the hydraulic pressure generator 1 of the first embodiment as described above, as shown in FIG. 3, the key member for the first key groove 32a and the second key groove 42 is provided by the clip 43 attached to the end of the nut member 32. Forty-five retaining stoppers are configured. Therefore, the assembly work of the drive transmission mechanism 30 can be simplified and the component cost of the drive transmission mechanism 30 can be suppressed.

In the hydraulic pressure generator 1 of the first embodiment, as shown in FIG. 4, the clip 43 is positioned on the base end surface 40b of the driven side pulley 40 by the positioning portion 46A, and the clip 43 is positioned in the circumferential direction by the positioning portion 46A. The orientation is also set.
As a result, when the clip 43 is assembled to the nut member 32 and the driven side pulley 40, both key grooves 32a and 42 can be inevitably closed by the clip 43.

In the hydraulic pressure generator of the first embodiment, as shown in FIG. 5, the outer peripheral portion of the clip 43 is pressed against the driven side pulley 40. As a result, it is possible to suppress the driven side pulley 40 from moving with respect to the nut member 32, so that the vibration of the hydraulic pressure generator 1 can be reduced.

Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment and can be appropriately modified without departing from the spirit of the first embodiment.
In the first embodiment, as shown in FIG. 5, the side surface 32d on the base end side of the clip mounting groove 32b is inclined, but the side surface 32d on the base end side of the clip mounting groove 32b is oriented in the axial direction of the nut member 32. It may be formed perpendicular to the opposite.
Further, in the first embodiment, the inner peripheral portion of the base end surface 43b of the clip 43 is inclined, but the base end surface 43b of the clip 43 may be formed on a flat surface.

In the drive transmission mechanism 30 of the first embodiment, as shown in FIG. 2, the rotational drive force of the output shaft 24a is input to the nut member 32 via the belt 34, but the rotational drive force of the output shaft 24a is a gear. It may be input to the nut member 32 via.

In the first embodiment, the master cylinder 10, the stroke simulator 50, and the slave cylinder 20 are provided on the base 100, but only the slave cylinder 20 may be provided on the base 100.

Further, the structures of the master cylinder 10, the slave cylinder 20, and the stroke simulator 50 are not limited. For example, a single piston type master cylinder or a tandem piston type slave cylinder may be used.

[Second Embodiment]
Next, the hydraulic pressure generator of the second embodiment will be described.
The hydraulic pressure generator of the second embodiment has substantially the same configuration as the hydraulic pressure generator 1 of the first embodiment (see FIG. 1), and as shown in FIG. 8, the positioning portion 46B of the drive transmission mechanism 30 The configuration is different.

In the positioning portion 46B of the second embodiment, a convex portion 47c protruding inward in the radial direction from the outer edge portion of the recessed portion 47a is formed at the lower end portion of the recessed portion 47a. The convex portion 47c is inserted between both ends of the clip 43.
As a result, in the second embodiment, the orientation of the clip 43 in the circumferential direction is determined by the convex portion 47c formed in the recessed portion 47a.

Although the second embodiment of the present invention has been described above, the present invention is not limited to the second embodiment, and can be appropriately modified without departing from the spirit of the first embodiment. be.

[Third Embodiment]
Next, the hydraulic pressure generator of the third embodiment will be described.
The hydraulic pressure generator of the third embodiment has substantially the same configuration as the hydraulic pressure generator 1 of the first embodiment (see FIG. 1), and as shown in FIG. 9, the positioning portion 46C of the drive transmission mechanism 30 The configuration is different.

The positioning portion 46C of the third embodiment includes a convex portion 47d formed on the base end surface 40b of the driven side pulley 40. The convex portion 47d is arranged between both ends of the clip 43. As a result, in the third embodiment, the orientation of the clip 43 in the circumferential direction is determined by the convex portion 47d of the base end surface 40b.

Although the third embodiment of the present invention has been described above, the present invention is not limited to the third embodiment, and can be appropriately modified without departing from the spirit of the first embodiment. be.

1 Hydraulic pressure generator 2a 1st main hydraulic passage 2b 2nd main hydraulic passage 3 Branch hydraulic passage 4 consecutive passages 10 Master cylinder 11 1st cylinder hole 12 1st piston 13 Coil spring 20 Slave cylinder 21 2nd cylinder hole 22 Second piston 23 Cylinder spring 24 Motor 24a Output shaft 25 Drive side pulley 30 Drive transmission mechanism 31 Rod 32 Nut member 32a First key groove 32b Clip mounting groove 33 Ball screw mechanism 34 Belt 36 Bearing 40 Driven side pulley 41 Center hole 42 Second key groove 43 Clip 43c Protrusion part 43d Hole part 45 Key member 46A Positioning part (first embodiment)
46B positioning unit (second embodiment)
46C positioning unit (third embodiment)
47a Recessed portion 47b Recessed portion 47c Convex portion (second embodiment)
47d convex part (third embodiment)
50 Stroke Simulator 51 Third Cylinder Hole 52 Third Piston 54 Lid Member 60 Hydraulic Control Device 90 Electronic Control Device 100 Base A Vehicle Brake System BP Brake Pedal R Brake Rod V1 First Switching Valve V2 Second Switching Valve V3 Normally Closed Type solenoid valve W wheel cylinder

Claims (4)

With the motor
A slave cylinder that generates brake fluid pressure by a piston,
A drive transmission mechanism that converts the rotational driving force of the output shaft of the motor into the force for pushing the piston is provided.
The drive transmission mechanism is
The rod in contact with the piston and
A cylindrical nut member surrounding the rod and
A ball screw mechanism provided between the outer peripheral surface of the rod and the inner peripheral surface of the nut member,
A cylindrical rotating body that rotates in conjunction with the output shaft is provided.
The nut member is inserted into the rotating body, and the nut member is inserted into the rotating body.
The end of the nut member protrudes from one side surface of the rotating body.
The first keyway formed on the outer peripheral surface of the nut member and
The second key groove formed on the inner peripheral surface of the rotating body communicates with the second key groove.
A key member is inserted into the first key groove and the second key groove, and the key member is inserted into the first key groove.
The inner peripheral portion of the C-shaped clip is fitted into the clip mounting groove formed on the outer peripheral surface of the end portion of the nut member.
The opening on one side of the first key groove and the second key groove is closed by the clip.
A positioning portion for positioning the clip is provided on one side surface of the rotating body.
The positioning unit is
The recessed portion into which the outer peripheral portion of the clip has entered, and the recessed portion.
With a recess formed on the outside of the recess,
A hydraulic pressure generator characterized in that two protrusions protruding radially outward from both ends of the clip are inserted into the recess. With the motor
A slave cylinder that generates brake fluid pressure by a piston,
A drive transmission mechanism that converts the rotational driving force of the output shaft of the motor into the force for pushing the piston is provided.
The drive transmission mechanism is
The rod in contact with the piston and
A cylindrical nut member surrounding the rod and
A ball screw mechanism provided between the outer peripheral surface of the rod and the inner peripheral surface of the nut member,
A cylindrical rotating body that rotates in conjunction with the output shaft is provided.
The nut member is inserted into the rotating body, and the nut member is inserted into the rotating body.
The end of the nut member protrudes from one side surface of the rotating body.
The first keyway formed on the outer peripheral surface of the nut member and
The second key groove formed on the inner peripheral surface of the rotating body communicates with the second key groove.
A key member is inserted into the first key groove and the second key groove, and the key member is inserted into the first key groove.
The inner peripheral portion of the C-shaped clip is fitted into the clip mounting groove formed on the outer peripheral surface of the end portion of the nut member.
The opening on one side of the first key groove and the second key groove is closed by the clip.
A positioning portion for positioning the clip is provided on one side surface of the rotating body.
The positioning portion includes a convex portion formed on the one side surface of the rotating body.
A hydraulic pressure generator characterized in that the convex portion is arranged between both ends of the clip. The hydraulic pressure generator according to claim 2.
The positioning unit is
A recess formed on one side surface of the rotating body is provided.
The outer peripheral portion of the clip has entered the recessed portion, and the outer peripheral portion of the clip has entered the recessed portion.
A hydraulic pressure generator characterized in that the convex portion is formed in the recessed portion. The hydraulic pressure generator according to any one of claims 1 to 3.
One side surface in the clip mounting groove is inclined so as to approach the other side surface from the opening edge of the clip mounting groove toward the bottom surface.
A hydraulic pressure generator characterized in that the outer peripheral portion of the clip is pressed against the rotating body.

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