Hydraulic pressure generation device
The hydraulic generating device achieves high flow rates and compact size by partitioning the hydraulic chamber and communication path orthogonally, enhancing crimping accuracy and reducing production costs and environmental impact.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ADVICS CO LTD
- Filing Date
- 2025-12-10
- Publication Date
- 2026-06-18
AI Technical Summary
Existing hydraulic generating devices face challenges in achieving both high flow rates and compact size, with the liquid passage design complicating the crimping process and increasing the device's size.
A hydraulic generating device with a housing, piston, and cover configuration that partitions a hydraulic chamber and a communication path orthogonal to the cylinder bore, allowing for a fluid passage on the opening surface, reducing the cover's size and maintaining high flow rates.
The solution ensures both high fluid flow rates and compact size, while improving crimping accuracy and reducing production costs and environmental impact.
Smart Images
Figure JP2025043178_18062026_PF_FP_ABST
Abstract
Description
Hydraulic generating device 【0001】 The present disclosure relates to a hydraulic generating device. 【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 through a notch provided on the groove side wall inside the mounting groove and extending obliquely with respect to the cylinder hole. 【0003】 German Patent Application Publication No. 102021210766 【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 generating device. 【0005】 In order to solve the above problems, a hydraulic generating device according to an aspect of the present disclosure includes a housing in which a cylinder hole and a liquid passage connected to the cylinder hole open on a predetermined opening surface, a piston disposed in the cylinder hole, and a cover attached to the opening surface so as to cover the openings of the cylinder hole and the liquid passage. The cover partitions a hydraulic chamber whose volume changes due to the movement of the piston together with the housing and the piston, and partitions a communication path that extends in a direction orthogonal to the axial direction of the cylinder hole and connects the hydraulic chamber and the liquid passage together with the housing. 【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. 【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. 【0008】 This is a schematic diagram showing an example configuration of a hydraulic pressure generating device according to Embodiment 1 of this disclosure. This is a plan view showing an example of an opening surface according to Embodiment 1 of this disclosure. This is a schematic diagram showing an example configuration of a hydraulic pressure generating device according to Embodiment 2 of this disclosure. This is a plan view showing an example of an opening surface according to Embodiment 2 of this disclosure. This is a schematic diagram showing an example configuration of a hydraulic pressure generating device according to Embodiment 3 of this disclosure. This is a schematic diagram showing an example configuration of a hydraulic pressure generating device according to Embodiment 4 of this disclosure. 【0009】 [Embodiment 1] Figure 1 is a schematic diagram showing one example of the configuration of a hydraulic pressure generating device according to Embodiment 1 of the present disclosure. The hydraulic pressure generating device 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 or 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 inside 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, etc. 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 a 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 connecting passage 31 is provided between the cover 20 and the opening surface 100 of the housing 10, connecting the first hydraulic chamber 30 and the fluid passage 101. The connecting passage 31 extends from the first hydraulic chamber 30 in a direction perpendicular to the central axis S1 of the cylinder bore 11 and is provided by the first coupling portion 22 and the second bottom portion 23 of the cover 20. The fluid passage 101 is connected to the cylinder bore 11 via the first hydraulic chamber 30 and the connecting passage 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 into the fluid passage 101. 【0016】 Figure 2 is a plan view showing an example of an opening surface according to Embodiment 1 of the present disclosure. As shown in Figure 2, the opening of the cylinder bore 11 is located within the opening of the hole 20A. The first connecting portion 22 of the cover 20 surrounds the outer circumference of the hole 20A. 【0017】 [Embodiment 2] Embodiment 2 of the present disclosure will be described below. For the sake of convenience of explanation, components having the same function as those described in Embodiment 1 will be denoted by the same reference numerals, and their descriptions will not be repeated. 【0018】 Figure 3 is a schematic diagram showing an example configuration of a hydraulic pressure generator according to Embodiment 2 of the present disclosure. Figure 4 is a plan view showing an example of an opening surface according to Embodiment 2 of the present disclosure. In the hydraulic pressure generator 1 according to Embodiment 2, the inner circumferential side wall 21A that partitions the first hydraulic pressure chamber 30 is not coaxial with the cylinder bore 11. The central axis S2 of the inner circumferential side wall 21A according to Embodiment 2 is located on the side of the liquid passage 101 than the central axis S1 of the cylinder bore 11. 【0019】 The cover 20 according to Embodiment 2 is cylindrical. As shown in Figure 4, the cover 20 according to Embodiment 2 has a point-symmetric shape with respect to the central axis S2 in a plan view, and a line-symmetric shape with respect to any line segment passing through the central axis S2. The first connecting portion 22 of the cover 20 according to Embodiment 2 is connected to the second connecting portion 102 of the housing 10 by crimping or the like. 【0020】 [Embodiment 3] Embodiment 3 of the present disclosure will be described below. For the sake of convenience of explanation, 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 airtightness 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 the present disclosure will be described below. For the sake of convenience of explanation, 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 one example configuration of a hydraulic pressure generating device 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】 [Modification] 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 generator according to one aspect of the present disclosure comprises a housing having a cylinder bore and a fluid 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 fluid 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 fluid passage. The fluid passage opens to the opening surface, and the connecting passage connecting the hydraulic chamber and the fluid passage is partitioned between the cover and the housing. By having the fluid passage open to the opening surface, the opening diameter of the fluid passage can be easily secured, and the flow rate of fluid flowing through the fluid passage can be easily secured. If the connecting passage is provided in the housing and an attempt is made to secure a sufficient flow rate of fluid flowing through the connecting 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 connecting 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 pressure generator does not tend to become large. Thus, it is possible to achieve both ensuring the fluid flow rate in the fluid passage and suppressing the size of the hydraulic pressure generator. Furthermore, in the conventional technology, the fluid passage opens at the bottom of the mounting groove that receives pressure during crimping, which has the problem of reduced crimping accuracy. Therefore, in one aspect of the hydraulic pressure generator of this disclosure, by opening the fluid passage on the opening surface and 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 fluid passage does not open at the crimping portion, and the reduction in crimping accuracy when the housing and cover are joined by crimping can be suppressed. 【0029】In one aspect of the present disclosure, the hydraulic pressure generating device is configured 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 chamber. The cover has a bottomed hole on the surface facing the opening surface, and the hole is configured such that the second bottom portion that demarcates the communication passage is closer to the opening surface than the first bottom portion that demarcates the hydraulic chamber. If the communication passage is to be located far from the opening surface, the shape of the cover becomes complex, making it difficult to mold the cover. By providing the communication passage close to the opening surface, the cover can be easily molded, and production costs can be reduced. Furthermore, by making the bottom portion of the communication passage closer to the opening surface than the bottom portion of the first portion that demarcates the hydraulic chamber, the amount of material required to produce the cover can be reduced. By reducing the amount of material required to produce the cover, the amount of carbon dioxide emitted during the production of that material can be reduced, and carbon neutrality can be achieved. Such effects contribute, for example, to achieving 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 opening 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, partitioning a hydraulic chamber, wherein the central axis of the cover is positioned 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 fluid flowing through the liquid passage can be easily secured. When the cover is formed in a cylindrical shape and the liquid passage opening to the 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 in the direction perpendicular to the central axis of the cylinder bore by the amount of the liquid passage. By shifting the central axis of the cover toward the liquid passage side than the central axis of the cylinder bore, the enlargement of the cover in the direction perpendicular to the central axis of the cylinder bore can be suppressed. 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. By connecting the hydraulic chamber and fluid passage with a cover, the size of the housing does not increase in the axial direction of the cylinder bore. Even if the hydraulic chamber and fluid passage are connected by 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 sufficient fluid flow rate in the fluid passage and a reduced size for 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.
Claims
1. A hydraulic pressure generating device comprising: a housing having a cylinder bore and a liquid passage connected to the cylinder bore opening to a predetermined opening surface; a piston disposed within 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.
2. The hydraulic pressure generating device according to claim 1, wherein the portion of the cover that partitions the communication passage is closer to the opening surface than the portion of the cover that partitions the hydraulic pressure chamber.
3. A hydraulic pressure generating device comprising: a housing having a cylinder bore and a liquid passage connected to the cylinder bore opening to a predetermined opening surface; a piston disposed within 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, partitioning 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.