Hydraulic pressure generator
The hydraulic pressure generating device ensures high fluid flow rates and compact size by positioning the liquid passage on the opening surface and connecting passage perpendicular to the cylinder bore, addressing crimping accuracy and sustainability concerns.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- ADVICS CO LTD
- Filing Date
- 2024-12-11
- Publication Date
- 2026-06-23
AI Technical Summary
Existing hydraulic pressure generating devices face challenges in achieving both high flow rates and compact size, with liquid passages often being located at the bottom of mounting grooves, leading to issues with crimping accuracy and increased device size.
The device incorporates a cover that partitions a hydraulic chamber with the housing and piston, featuring a liquid passage opening on the opening surface and a connecting passage perpendicular to the cylinder bore, ensuring fluid flow while minimizing device size and maintaining crimping accuracy.
This configuration allows for high fluid flow rates without increasing the device's size, enhances crimping accuracy, and reduces material and production costs, contributing to sustainable manufacturing practices.
Smart Images
Figure 2026101859000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a hydraulic pressure generating device.
Background Art
[0002] Patent Document 1 discloses a technique in which a cylinder hole is opened on a first surface of a hydraulic block, and a tubular cylinder cover is arranged on a second surface located on the opposite side of the first surface to extend the cylinder hole. This cylinder cover is coupled to the hydraulic block by a surrounding caulking portion. This caulking portion engages so as to cover the mounting flange of the cylinder cover. This mounting flange is arranged in a mounting groove surrounding the opening of the cylinder hole. A brake pipeline opens in a passage provided at the bottom of this mounting groove. This passage connects the brake pipeline to the inner chamber of the cylinder cover inside the cylinder cover. This passage communicates with the inner chamber of the cylinder cover by a notch provided on the groove side wall inside the mounting groove and extending obliquely with respect to the cylinder hole.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In Patent Document 1, a liquid passage opens at the bottom of the mounting groove that receives pressure during caulking. Therefore, it is difficult to achieve both ensuring the flow rate of the liquid passage and suppressing the size of the hydraulic pressure generating device.
Means for Solving the Problems
[0005] To solve the above problems, a hydraulic pressure generating device according to one aspect of the present disclosure comprises a housing having a cylinder bore and a liquid passage connected to the cylinder bore open to a predetermined opening surface, a piston disposed in the cylinder bore, and a cover attached to the opening surface so as to cover the openings of the cylinder bore and the liquid passage, wherein the cover, together with the housing and the piston, partitions a hydraulic chamber whose volume changes with the movement of the piston, and together with the housing, partitions a connecting passage that extends in a direction perpendicular to the axial direction of the cylinder bore and connects the hydraulic chamber and the liquid passage.
[0006] To solve the above problems, a hydraulic pressure generating device according to one aspect of the present disclosure comprises a housing having a cylinder bore and a liquid passage connected to the cylinder bore open to a predetermined opening surface, a piston disposed in the cylinder bore, and a bottomed cylindrical cover attached to the opening surface so as to cover the openings of the cylinder bore and the liquid passage, and together with the housing and the piston, partitions a hydraulic chamber, wherein the cover is positioned such that its central axis is located on the opening side of the liquid passage than the central axis of the cylinder bore. [Effects of the Invention]
[0007] According to one aspect of this disclosure, it is possible to achieve both securing the flow rate of the liquid passage and suppressing the size of the hydraulic pressure generating device. [Brief explanation of the drawing]
[0008] [Figure 1] This is a schematic diagram showing one example configuration of a hydraulic pressure generating device according to Embodiment 1 of this disclosure. [Figure 2] This is a plan view showing an example of an opening surface according to Embodiment 1 of this disclosure. [Figure 3] This is a schematic diagram showing one example configuration of a hydraulic pressure generating device according to Embodiment 2 of the present disclosure. [Figure 4] This is a plan view showing an example of an opening surface according to Embodiment 2 of this disclosure. [Figure 5] This is a schematic diagram showing one example configuration of a hydraulic pressure generating device according to Embodiment 3 of the present disclosure. [Figure 6] This is a schematic diagram showing one example configuration of a hydraulic pressure generating device according to Embodiment 4 of the present disclosure. [Modes for carrying out the invention]
[0009] [Embodiment 1] Figure 1 is a schematic diagram showing one example configuration of a hydraulic pressure generator according to Embodiment 1 of the present disclosure. The hydraulic pressure generator 1 shown in Figure 1 comprises a housing 10, a piston 12, a linear motion conversion mechanism 13, and a cover 20.
[0010] The housing 10 is made of a metal material including aluminum alloy and iron. The housing 10 has a cylinder bore 11 opening in a predetermined opening surface 100. In Figure 1, S1 is the central axis of the cylinder bore 11. The piston 12 is positioned within the cylinder bore 11. The piston 12 is coaxial with the cylinder bore 11. The piston 12 is slidable within the cylinder bore 11 in a direction parallel to the central axis S1 of the cylinder bore 11. Hereinafter, the direction parallel to the central axis S1 of the cylinder bore 11 will be referred to as the axial direction of the cylinder bore 11. The linear motion conversion mechanism 13 is, for example, a screw mechanism and has a rotating part 130 and a linear motion part 131. The rotating part 130 is, for example, a screw shaft and is coaxial with the cylinder bore 11. The rotating part 130 rotates in conjunction with the rotating shaft of an electric motor or the like. The linear motion part 131 converts the rotation of the rotating part 130 into linear motion. The piston 12 moves linearly in conjunction with the linear motion part 131.
[0011] The cover 20 is cylindrical and covers the opening of the cylinder bore 11 and the opening of the liquid passage 101 connected to the cylinder bore 11. The cover 20 is made of a metal material including, for example, an aluminum alloy or iron. The cover 20 has a hole 20A on the surface facing the opening surface 100 of the cylinder bore 11. The hole 20A is connected to the cylinder bore 11. The diameter of the opening of the hole 20A is larger than the diameter of the opening of the cylinder bore 11, and the opening of the hole 20A is surrounded by an annular first connecting portion 22.
[0012] The opening surface 100 of the housing 10 is provided with a second connecting portion 102 that surrounds the outer circumference of the cylinder hole 11. The second connecting portion 102 is, for example, a groove into which the first connecting portion 22 of the cover 20 is inserted. When the first connecting portion 22 is connected to the second connecting portion 102 by crimping or the like, the hole 20A is connected to the cylinder hole 11, and the cylinder hole 11 is extended to the inside of the cover 20.
[0013] The cover 20, to which the first coupling portion 22 is coupled to the second coupling portion 102, partitions the hydraulic chamber together with the housing 10 and the piston 12. The cover 20 has a first bottom portion 21 facing the cylinder bore 11. An inner circumferential side wall 21A extends from the outer circumference of the first bottom portion 21 toward the opening surface 100 of the housing 10 along the central axis S1 of the cylinder bore 11. Inside the cover 20, a cylindrical first hydraulic chamber 30 is partitioned by the first bottom portion 21 and the inner circumferential side wall 21A. This first hydraulic chamber 30 constitutes part of the hydraulic chamber partitioned by the housing 10, the cover 20, and the piston 12. In Embodiment 1, the inner circumferential side wall 21A partitioning the first hydraulic chamber 30 is coaxial with the cylinder bore 11. The hydraulic chamber extends from the first hydraulic chamber 30 partitioned within the hole 20A of the cover 20 to the piston 12 within the cylinder bore 11. The cover 20 extends the hydraulic chamber partitioned within the cylinder bore 11 by the piston 12 to the first hydraulic chamber 30. As the piston 12 slides within the cylinder bore 11 in conjunction with the linear motion of the linear motion unit 131, the volume of the hydraulic chamber changes. As the linear motion unit 131 and the piston 12 move toward the cover 20, the volume of the hydraulic chamber decreases and the hydraulic pressure inside the hydraulic chamber increases.
[0014] A fluid passage 101 is connected to the opening surface 100 of the housing 10, which communicates with the first hydraulic chamber 30, which is part of the hydraulic chamber. The hydraulic pressure generator 1 discharges fluid from the hydraulic chamber, including the first hydraulic chamber 30, via this fluid passage 101. For example, if the hydraulic pressure generator 1 is installed in a braking system, the fluid passage 101 discharges fluid to the master cylinder, wheel cylinder, etc.
[0015] A communication path 31 connecting the first hydraulic chamber 30 and the hydraulic passage 101 is defined between the cover 20 and the opening surface 100 of the housing 10. The communication path 31 extends (extends) from the first hydraulic chamber 30 in a direction orthogonal to the central axis S1 of the cylinder hole 11 and is defined by the first joint portion 22 and the second bottom portion 23 of the cover 20. The hydraulic passage 101 is connected to the cylinder hole 11 via the first hydraulic chamber 30 and the communication path 31. The second bottom portion 23 is closer to the opening surface 100 of the housing 10 than the first bottom portion 21. Therefore, the fluid in the hydraulic chamber is smoothly guided to the hydraulic passage 101.
[0016] FIG. 2 is a plan view showing an example of an opening surface according to Embodiment 1 of the present disclosure. As shown in FIG. 2, the opening of the cylinder hole 11 is located within the opening of the hole 20A. The first joint portion 22 of the cover 20 surrounds the outer periphery of the hole 20A.
[0017] [Embodiment 2] Embodiment 2 of the present disclosure will be described below. For the sake of convenience of explanation, members having the same functions as those described in Embodiment 1 above are given the same reference numerals, and the description thereof will not be repeated.
[0018] FIG. 3 is a schematic view showing a configuration example of a hydraulic generator according to Embodiment 2 of the present disclosure. FIG. 4 is a plan view showing an example of an opening surface according to Embodiment 2 of the present disclosure. In the hydraulic generator 1 according to Embodiment 2, the inner peripheral side wall 21A partitioning the first hydraulic chamber 30 is not coaxial with the cylinder hole 11. The central axis S2 of the inner peripheral side wall 21A according to Embodiment 2 is located on the hydraulic passage 101 side with respect to the central axis S1 of the cylinder hole 11.
[0019] The cover 20 according to Embodiment 2 is cylindrical. As shown in FIG. 4, the cover 20 according to Embodiment 2 has a point-symmetrical shape centered on the central axis S2 in a plan view and has a line-symmetrical shape with respect to any line segment passing through the central axis S2. The first joint portion 22 of the cover 20 according to Embodiment 2 is joined to the second joint portion 102 of the housing 10 by caulking or the like.
[0020] [Embodiment 3] Embodiment 3 of this disclosure will be described below. For the sake of convenience, components having the same function as those described in Embodiments 1 and 2 above will be denoted by the same reference numerals, and their descriptions will not be repeated.
[0021] Figure 5 is a schematic diagram showing one example configuration of a hydraulic pressure generator according to Embodiment 3 of the present disclosure. In the hydraulic pressure generator 1 according to Embodiment 3 of the present disclosure, an O-ring 220 is housed between the first coupling portion 22 of the cover 20 and the second coupling portion 102 of the housing 10. In Figure 5, a groove is formed in the first coupling portion 22 of the cover 20, and the O-ring 220 is housed between the groove of the first coupling portion 22 and the second coupling portion 102 of the housing 10. The portion of the first coupling portion 22 that abuts the second coupling portion 102 is joined by crimping or the like. When the first coupling portion 22 is joined to the second coupling portion 102, the O-ring 220 is compressed between the first coupling portion 22 and the second coupling portion 102, improving the sealing performance of the hydraulic chamber.
[0022] The second coupling portion 102 of the housing 10 may have a protrusion that can be inserted into the groove of the first coupling portion 22, or it may have a groove that, together with the groove of the first coupling portion 22, forms a housing portion for accommodating the O-ring 220.
[0023] [Embodiment 4] Embodiment 4 of this disclosure will be described below. For the sake of clarity, components having the same function as those described in Embodiments 1 to 3 above will be denoted by the same reference numerals, and their descriptions will not be repeated.
[0024] Figure 6 is a schematic diagram showing an example configuration of a hydraulic pressure generator according to Embodiment 4 of the present disclosure. The cover 20 according to Embodiment 4 differs from Embodiment 2 in that the portion of its inner circumferential side wall 21A that demarcates a communication passage 31 between it and the opening surface 100 of the housing 10 is inclined with respect to the central axis S2 of the inner circumferential side wall 21A. The communication passage 31 thus demarcated also extends from the first hydraulic chamber 30 in a direction perpendicular to the axial direction of the cylinder bore 11.
[0025] [Variation] In embodiments 1 to 4 described above, the cover 20 has a first bottom portion 21, and the cylindrical first hydraulic chamber 30 is partitioned by the first bottom portion 21 and the inner circumferential side wall 21A. However, the cover 20 does not need to have a first bottom portion 21 as long as it can partition the hydraulic chamber together with the housing 10 and the piston 12. For example, the inner circumferential side wall 21A of the cover 20 may be provided such that one end faces the cylinder hole 11 and the other end faces another cylinder hole or other parts of the housing 10.
[0026] In the above embodiment 1, the inner circumferential side wall 21A that partitions the first hydraulic chamber 30 in the cover 20 is coaxial with the cylinder bore 11. However, the central axis of the inner circumferential side wall 21A that partitions the first hydraulic chamber 30 may be located on the side of the fluid passage 101 than the central axis S1 of the cylinder bore 11.
[0027] In embodiments 1 to 4 described above, the opening surface 100 of the housing 10 extended in a direction perpendicular to the central axis S1 of the cylinder bore 11, within the illustrated range. However, the direction in which the opening surface 100 of the housing 10 extends does not have to be perpendicular to the central axis S1 of the cylinder bore 11. For example, the direction in which the opening surface 100 of the housing 10 extends may be at an angle other than 90° with respect to the central axis S1 of the cylinder bore 11. Furthermore, the opening surface 100 of the housing 10 may have curved surfaces or irregularities to the extent that they do not affect the connection between the first joint portion 22 and the second joint portion 102 of the cover 20.
[0028] 〔summary〕 A hydraulic pressure generating device according to one aspect of the present disclosure comprises a housing having a cylinder bore and a liquid passage connected to the cylinder bore opening to a predetermined opening surface, a piston disposed in the cylinder bore, and a cover attached to the opening surface so as to cover the openings of the cylinder bore and the liquid passage, wherein the cover, together with the housing and the piston, partitions a hydraulic chamber whose volume changes with the movement of the piston, and together with the housing, partitions a connecting passage that extends in a direction perpendicular to the axial direction of the cylinder bore and connects the hydraulic chamber and the liquid passage. The fluid passage opens to the open surface, and a connecting passage between the hydraulic chamber and the fluid passage is partitioned between the cover and the housing. By making the fluid passage open to the open surface, the opening diameter of the fluid passage can be easily secured, and the flow rate of the fluid flowing through the fluid passage can be easily secured. If a communication passage is provided in the housing and sufficient fluid flow is to be ensured through that passage, the size of the housing may increase in the axial direction of the cylinder bore in order to ensure the durability of the housing. By providing the communication passage in the cover, the size of the housing does not increase in the axial direction of the cylinder bore. By providing the communication passage so that it extends from the hydraulic chamber in a direction perpendicular to the axial direction of the cylinder bore, the size of the cover does not increase in the axial direction of the cylinder bore. The size of the cover in the direction perpendicular to the axial direction of the cylinder bore is sufficiently small compared to the housing. Therefore, even when providing the communication passage in the housing and trying to ensure a sufficient fluid flow rate through the communication passage, the hydraulic generator does not tend to become large in size. Therefore, it is possible to achieve both ensuring sufficient flow rate in the liquid channel and minimizing the size of the hydraulic pressure generator. Furthermore, in conventional technology, the liquid passage is opened at the bottom of the mounting groove that receives pressure during crimping, which leads to a problem of reduced crimping accuracy. Therefore, in one aspect of the present disclosure, the liquid pressure generating device is provided with the liquid passage opening on the opening surface and the connecting passage extending from the liquid pressure chamber in a direction perpendicular to the axial direction of the cylinder bore, thereby preventing the liquid passage from opening in the crimping portion and suppressing the reduction in crimping accuracy when the housing and cover are joined by crimping.
[0029] In one embodiment of the present disclosure, the hydraulic pressure generating device is such that the portion of the cover that demarcates the communication passage is closer to the opening surface than the portion of the cover that demarcates the hydraulic pressure chamber. The cover has a bottomed hole on the side facing the opening, and the hole is positioned so that the second bottom, which partitions the communication passage, is closer to the opening than the first bottom, which partitions the hydraulic chamber. If the communication passage is to be located far from the opening, the shape of the cover becomes complex, making it difficult to mold. By placing the communication passage close to the opening, the cover can be easily molded, and production costs can be reduced. Furthermore, by positioning the bottom of the connecting passage closer to the opening than the bottom of the first section that partitions the hydraulic chamber, the amount of material required for cover production can be reduced. Reducing the amount of material required for cover production reduces the amount of carbon dioxide emitted during the production of that material, thereby achieving carbon neutrality. Such effects contribute to achieving, for example, Goal 12 of the United Nations' Sustainable Development Goals (SDGs), "Ensure sustainable consumption and production patterns."
[0030] A hydraulic pressure generating device according to one aspect of the present disclosure comprises a housing having a cylinder bore and a liquid passage connected to the cylinder bore open to a predetermined opening surface, a piston disposed in the cylinder bore, and a bottomed cylindrical cover attached to the opening surface so as to cover the openings of the cylinder bore and the liquid passage, and together with the housing and the piston, partitions a hydraulic chamber, wherein the cover is positioned such that its central axis is located on the opening side of the liquid passage than the central axis of the cylinder bore. By making the liquid passage open to the opening surface, the opening diameter of the liquid passage can be easily secured, and the flow rate of the fluid flowing through the liquid passage can be easily secured. When a cover is formed in a cylindrical shape and a liquid passage opening in its opening surface communicates with a hydraulic chamber partitioned inside the cover, if the central axis of the cover is aligned with the central axis of the cylinder bore, the cover will be enlarged by the amount of the liquid passage in the direction perpendicular to the central axis of the cylinder bore. By shifting the central axis of the cover toward the fluid passage side relative to the central axis of the cylinder bore, it is possible to suppress the cover from becoming larger in the direction perpendicular to the central axis of the cylinder bore. If the hydraulic chamber and fluid passage are connected by a housing, the size of the housing may increase in the axial direction of the cylinder bore. Connecting the hydraulic chamber and fluid passage with a cover prevents the size of the housing from increasing in the axial direction of the cylinder bore. Even if the hydraulic chamber and fluid passage are connected with a cover, the size of the cover does not increase in the axial direction of the cylinder bore. Therefore, it is possible to achieve both ensuring sufficient flow rate in the liquid channel and minimizing the size of the hydraulic pressure generator.
[0031] [Additional Notes] This disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of this disclosure. [Explanation of symbols]
[0032] 1. Hydraulic pressure generator 10 Housing 11 Cylinder bore 12 pistons 20 Covers 21 1st bottom 23 Second bottom 31 Connecting routes 100 Opening surface 101 Liquid path
Claims
1. A housing in which a cylinder bore and a fluid passage connected to the cylinder bore are open to a predetermined opening surface, A piston positioned within the cylinder bore, The system includes a cover that is attached to the opening surface so as to cover the cylinder bore and the opening of the liquid passage, The cover, together with the housing and the piston, partitions a hydraulic chamber whose volume changes due to the movement of the piston, and together with the housing, partitions a connecting passage that extends in a direction perpendicular to the axial direction of the cylinder bore and connects the hydraulic chamber and the liquid passage, thereby forming a hydraulic pressure generating device.
2. The hydraulic pressure generating device according to claim 1, wherein the portion of the cover that demarcates the communication passage is closer to the opening surface than the portion of the cover that demarcates the hydraulic pressure chamber.
3. A housing in which a cylinder bore and a fluid passage connected to the cylinder bore are open to a predetermined opening surface, A piston positioned within the cylinder bore, A bottomed cylindrical cover is attached to the opening surface so as to cover the cylinder bore and the opening of the liquid passage, and together with the housing and the piston, partitions the hydraulic chamber. The cover is a hydraulic pressure generating device in which the central axis is positioned on the opening side of the liquid passage, relative to the central axis of the cylinder bore.