Hydraulic cylinder assembly, hydraulic brake device and vehicle

Abstract

The present disclosure relates to a hydraulic cylinder assembly, a hydraulic brake device and a vehicle, wherein the hydraulic cylinder assembly comprises a first hydraulic cylinder and a second hydraulic cylinder, wherein the first hydraulic cylinder comprises a first cylinder body and a first piston movably mounted on the first cylinder body, and the second hydraulic cylinder comprises a second cylinder body and a second piston movably mounted on the second cylinder body; the first piston has a first end face and a second end face opposite to each other along its moving direction, and the second piston has a third end face and a fourth end face opposite to each other along its moving direction, the first end face and the inner surface of the first cylinder body jointly define a first oil chamber, a second oil chamber is provided between the second end face and the third end face, and a first through hole connected to the first oil chamber is formed on the first cylinder body; wherein the area of ​​the first end face is greater than the area of ​​the second end face, and the area of ​​the third end face is greater than the area of ​​the second end face. The hydraulic cylinder assembly of the present disclosure can achieve the effect of lifting the output force of the piston.

Description

Technical Field

[0001] The present disclosure relates to the field of hydraulic technology, and in particular to a hydraulic cylinder assembly, a hydraulic brake device and a vehicle. Background Art

[0002] At present, there are generally three ways to increase the output force of the hydraulic cylinder. One is to directly increase the cross-sectional area of ​​the piston, but this method will increase the volume of the entire device and is difficult to implement when space is limited. The second method is to have the pistons of two or more hydraulic cylinders push against the piece to be pushed at the same time, but this method is difficult to ensure that the extension speeds of the pistons of multiple hydraulic cylinders are consistent, which will cause uneven force on the piece to be pushed. In addition, when the volume of the piece to be pushed is small, it may be difficult to implement the problem of having the pistons of multiple hydraulic cylinders push against the piece to be pushed at the same time. Another method is to set multiple hydraulic cylinders in series, and use the piston of the hydraulic cylinder closest to the piece to be pushed to push against the piece to be pushed. This series-connected hydraulic cylinder assembly can only adjust the output force of the entire hydraulic cylinder assembly by adjusting the number of series-connected hydraulic cylinders. Summary of the invention

[0003] The purpose of the present disclosure is to provide a hydraulic cylinder assembly, a hydraulic brake device and a vehicle to solve the technical problems existing in the related art.

[0004] To achieve the above object, according to one aspect of the present disclosure, a hydraulic cylinder assembly is provided, comprising a first hydraulic cylinder and a second hydraulic cylinder, wherein the first hydraulic cylinder comprises a first cylinder body and a first piston movably mounted on the first cylinder body, and the second hydraulic cylinder comprises a second cylinder body and a second piston movably mounted on the second cylinder body;

[0005] The first piston has a first end face and a second end face opposite to each other along its moving direction, the second piston has a third end face and a fourth end face opposite to each other along its moving direction, the first end face and the inner surface of the first cylinder body jointly define a first oil chamber, a second oil chamber is defined between the second end face and the third end face, and a first through hole communicating with the first oil chamber is formed on the first cylinder body;

[0006] The area of ​​the first end face is larger than that of the second end face, and the area of ​​the third end face is larger than that of the second end face.

[0007] Optionally, the second cylinder body is connected to the first cylinder body, a second through hole for the first piston to pass through is formed on the second cylinder body, and the second end surface, the inner surface of the second cylinder body and the third end surface jointly define the second oil chamber.

[0008] Optionally, at least part of the second cylinder is located within the first cylinder.

[0009] Optionally, there are multiple first hydraulic cylinders, and the first cylinder bodies of the multiple first hydraulic cylinders are connected in sequence. The first through hole on the first cylinder body of the first hydraulic cylinder located at the head end of the multiple first hydraulic cylinders is used to connect with the oil supply source, and the first cylinder body of the first hydraulic cylinder located at the tail end of the multiple first hydraulic cylinders is connected to the second cylinder body. The first piston of the previous first hydraulic cylinder of each two adjacent first hydraulic cylinders passes through the first through hole on the first cylinder body of the next first hydraulic cylinder, and the first piston of the first hydraulic cylinder located at the tail end of the multiple first hydraulic cylinders passes through the second through hole, and the second end face of the first piston together with the inner surface of the second cylinder body and the third end face define the second oil chamber.

[0010] Optionally, the first cylinder body of one of two adjacent first hydraulic cylinders is at least partially located in the first cylinder body of the other first hydraulic cylinder.

[0011] Optionally, the first piston includes a piston body and a piston rod protruding from the piston body, the piston rod is used to pass through the second through hole, the end face of the piston body away from the piston rod is the first end face, the end face of the piston rod away from the piston body is the second end face, a first air gap is provided between an end of the piston body close to the piston rod and an outer surface of the second cylinder body, a first air vent hole connected to the first air gap is formed on the first cylinder body, a first oil replenishing hole connected to the first air gap and the second oil chamber is formed on the second cylinder body, and a first oil replenishing pipe passes through the first air vent hole and the first oil replenishing hole and is connected to the second oil chamber.

[0012] Optionally, a central axis of the first air vent hole and a central axis of the first oil replenishing hole are located in the same plane parallel to the moving direction of the first piston.

[0013] Optionally, a first oil replenishing port communicating with the second oil chamber is formed on the second piston;

[0014] Wherein, a first stop valve is provided at the first oil replenishing port; or a detachable first blocking member is provided at the first oil replenishing port.

[0015] Optionally, a first mounting boss is formed on the first cylinder body, a second mounting boss is formed on the second cylinder body, a first mounting hole for a fastener to pass through is formed on the first mounting boss, and a second mounting hole for the fastener to pass through is formed on the second mounting boss.

[0016] Optionally, the second end face and the inner surface of the first cylinder body jointly define a first sub-oil chamber, the third end face and the inner surface of the second cylinder body jointly define a second sub-oil chamber, the first sub-oil chamber is connected to the second sub-oil chamber through a first oil pipe, and the first sub-oil chamber, the oil channel inside the first oil pipe and the second sub-oil chamber jointly constitute the second oil chamber.

[0017] Optionally, there are multiple first hydraulic cylinders, and the first cylinder bodies of the multiple first hydraulic cylinders are connected in series in sequence through a second oil pipeline. The first through hole on the first cylinder body of the first hydraulic cylinder located most upstream among the multiple first hydraulic cylinders is used to communicate with an oil supply source. The second end surface of the first piston of the first hydraulic cylinder located most downstream among the multiple first hydraulic cylinders and the inner surface of the first cylinder body of the first hydraulic cylinder jointly define the first sub-oil chamber. The second end surface of the first piston of the first hydraulic cylinder located upstream among every two adjacent first hydraulic cylinders and the inner surface of the first cylinder body of the first hydraulic cylinder jointly define a third oil chamber. The third oil chamber is connected with the first oil chamber of the first hydraulic cylinder located downstream among every two adjacent first hydraulic cylinders through the second oil pipeline.

[0018] Optionally, there are multiple first hydraulic cylinders, and the first cylinder bodies of the multiple first hydraulic cylinders are connected in sequence. The first through hole on the first cylinder body of the first hydraulic cylinder located at the head end of the multiple first hydraulic cylinders is used to connect with the oil supply source. The second end surface of the first piston of the first hydraulic cylinder located at the tail end of the multiple first hydraulic cylinders and the inner surface of the first cylinder body of the first hydraulic cylinder jointly define the first sub-oil chamber, and the first piston of the previous first hydraulic cylinder in every two adjacent first hydraulic cylinders passes through the first through hole on the first cylinder body of the next first hydraulic cylinder.

[0019] Optionally, a second oil replenishing port communicating with the second oil sub-chamber is formed on the second cylinder body, and a second stop valve or a detachable second blocking member is provided at the second oil replenishing port; and / or,

[0020] The first oil delivery pipe is connected to a third oil replenishment pipe, and the third oil replenishment pipe is provided with a third stop valve.

[0021] Optionally, the areas of the first end surfaces of the plurality of first pistons are the same, and the areas of the second end surfaces of the plurality of first pistons are the same.

[0022] Optionally, the first cylinder body includes a first cylinder groove, the first piston is installed in the first cylinder groove, and the second cylinder body includes a second cylinder groove, the second piston is installed in the second cylinder groove;

[0023] The inner diameter of the first cylinder groove is equal to the outer diameter of the first end face, the inner diameter of the second cylinder groove is equal to the outer diameter of the third end face, the outer diameter of the first end face is equal to the outer diameter of the third end face, and the ratio of the outer diameter of the third end face to the outer diameter of the second end face is greater than or equal to 2.

[0024] Optionally, an annular groove is formed on the inner surface of the second cylinder body, an annular sealing ring is sleeved on the outer circumferential surface of the second piston, the annular sealing ring is located in the annular groove, and a chamfer is formed on the side wall of the annular groove away from the third end face.

[0025] According to another aspect of the present disclosure, a hydraulic brake device is provided, comprising the hydraulic cylinder assembly, brake pad and friction pad described in any of the above technical solutions, wherein the fourth end surface of the second piston is used to press against the brake pad and push the brake pad toward the friction pad to press the friction pad.

[0026] According to yet another aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned hydraulic brake device.

[0027] Through the above technical solution, since the area of ​​the first end face of the first piston in the hydraulic cylinder assembly of the present application is larger than the area of ​​the second end face, and the area of ​​the third end face of the second piston is larger than the area of ​​the second end face, in this way, when the pressure of the hydraulic medium transmitted by the hydraulic cylinder remains unchanged, since the area of ​​the force-bearing surface (i.e., the third end face) of the second piston is larger than the area of ​​the force-applying surface (i.e., the second end face) of the first piston, the output force of the second piston is larger than the input force received by the first piston. In other words, by combining the first hydraulic cylinder and the second hydraulic cylinder, and setting the area of ​​the first end face of the first piston to be larger than the area of ​​its second end face, and the area of ​​the third end face of the second piston to be larger than the area of ​​the second end face of the first piston, the effect of increasing the output force of the piston can be achieved.

[0028] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0030] Figure 1 is a schematic diagram of a three-dimensional structure of a hydraulic cylinder assembly provided by an exemplary embodiment of the present disclosure;

[0031] Figure 2 is a schematic diagram of a longitudinal cross-sectional structure of an exemplary hydraulic cylinder assembly provided in a first embodiment of the present disclosure;

[0032] Figure 3 yes Figure 2 A schematic diagram of the enlarged local structure at point A in the middle;

[0033] Figure 4 is a schematic diagram of a transverse cross-sectional structure of a hydraulic cylinder assembly provided by an exemplary embodiment of the present disclosure;

[0034] Figure 5 is a schematic diagram of a three-dimensional structure of a first piston of a first hydraulic cylinder of a hydraulic cylinder assembly provided by an exemplary embodiment of the present disclosure;

[0035] Figure 6 is a schematic diagram of the three-dimensional structure of a second cylinder body of a second hydraulic cylinder of a hydraulic cylinder assembly provided by an exemplary embodiment of the present disclosure;

[0036] Figure 7 is a schematic structural diagram of a second piston of a second hydraulic cylinder of a hydraulic cylinder assembly provided by an exemplary embodiment of the present disclosure;

[0037] Figure 8 is a schematic cross-sectional structure diagram of a hydraulic cylinder assembly provided by an exemplary embodiment of the present disclosure, wherein only a first piston, a second cylinder body and a second piston are shown;

[0038] Fig. 9 is a schematic cross-sectional structural diagram of a hydraulic cylinder assembly provided in another exemplary embodiment of the present disclosure;

[0039] Fig.10 is a schematic cross-sectional structural diagram of a hydraulic cylinder assembly provided in yet another exemplary embodiment of the present disclosure;

[0040] Fig.11 is a schematic cross-sectional structural diagram of a hydraulic cylinder assembly provided in yet another exemplary embodiment of the present disclosure;

[0041] Fig.12 is a schematic cross-sectional structural diagram of a hydraulic cylinder assembly provided in yet another exemplary embodiment of the present disclosure;

[0042] Fig.13 It is a schematic cross-sectional structure diagram of a hydraulic cylinder assembly provided in yet another exemplary embodiment of the present disclosure.

[0043] Description of Reference Numerals

[0044] 100-hydraulic cylinder assembly; 1-first hydraulic cylinder; 11-first cylinder body; 111-first through hole; 112-first mounting boss; 12-first piston; 121-first end face; 122-second end face; 123-piston body; 124-piston rod; 13-first cylinder groove; 2-second hydraulic cylinder; 21-second cylinder body; 211-second through hole; 212-second mounting boss; 213-second oil replenishment port; 214-second stop valve; 215-second blocking member; 216-third oil replenishment port; 216-third stop valve; 218-third blocking member; 22-second piston; 221-third end face; 222-fourth end face; 23-second cylinder groove; 3 -First oil chamber; 4-Second oil chamber; 41-First sub-oil chamber; 42-Second sub-oil chamber; 51-First air gap; 52-First ventilation hole; 53-Second air gap; 54-Second ventilation hole; 61-First oil replenishing hole; 62-First oil replenishing pipe; 63-Shut-off valve; 64-Second oil replenishing hole; 65-Second oil replenishing pipe; 71-First oil replenishing port; 72-First stop valve; 73-First blocking member; 81-First oil delivery pipe; 811-Third oil replenishing pipe; 812-Third stop valve; 82-Second oil delivery pipe; 821-Fourth oil replenishing pipe; 822-Fourth stop valve; 83-Third oil chamber; 91-Annular groove; 92-Chamfer; 93-Annular sealing ring. DETAILED DESCRIPTION

[0045] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0046] In the present disclosure, unless otherwise stated, the directional words used, such as "inside" and "outside", refer to the inside and outside of a specific structural outline. The terms used, such as "first" and "second", are only used to distinguish one element from another element, and do not have order or importance. In addition, the directional words used above are only used to simplify the description of the present disclosure, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present disclosure.

[0047] like Figures 1 to 13As shown, according to one aspect of the present disclosure, a hydraulic cylinder assembly 100 is provided, comprising a first hydraulic cylinder 1 and a second hydraulic cylinder 2, wherein the first hydraulic cylinder 1 comprises a first cylinder body 11 and a first piston 12 movably mounted on the first cylinder body 11, and the second hydraulic cylinder 2 comprises a second cylinder body 21 and a second piston 22 movably mounted on the second cylinder body 21. The first piston 12 has a first end face 121 and a second end face 122 opposite to each other along its moving direction, and the second piston 22 has a third end face 221 and a fourth end face 222 opposite to each other along its moving direction, the first end face 121 and the inner surface of the first cylinder body 11 jointly define a first oil chamber 3, a second oil chamber 4 is provided between the second end face 122 and the third end face 221, and a first through hole 111 communicating with the first oil chamber 3 is formed on the first cylinder body 11. The area of ​​the first end face 121 is greater than the area of ​​the second end face 122, and the area of ​​the third end face 221 is greater than the area of ​​the second end face 122.

[0048] The working process / working principle of the above-mentioned hydraulic cylinder assembly 100 is: when the pressure of the hydraulic medium in the first oil chamber 3 increases, the first end face 121 of the first piston 12 is thrust, and the first piston 12 moves, and the second end face 122 of the first piston squeezes the hydraulic medium in the second oil chamber 4 between the second end face 122 and the third end face 221, so that the second piston 22 moves and outputs force outward.

[0049] Through the above technical solution, since the area of ​​the first end face 121 of the first piston 12 in the hydraulic cylinder assembly 100 of the present application is larger than the area of ​​the second end face 122, and the area of ​​the third end face 221 of the second piston 22 is larger than the area of ​​the second end face 122, in this way, when the pressure of the hydraulic medium transmitted by the hydraulic cylinder remains unchanged, since the area of ​​the force-bearing surface (i.e., the third end face 221) of the second piston 22 is larger than the area of ​​the force-applying surface (i.e., the second end face 122) of the first piston 12, the output force of the second piston 22 is larger than the input force received by the first piston 12. In other words, by providing the first hydraulic cylinder 1 and the second hydraulic cylinder 2, and setting the area of ​​the first end face 121 of the first piston 12 to be larger than the area of ​​its second end face 122, the area of ​​the third end face 221 of the second piston 22 is larger than the area of ​​the second end face 122 of the first piston 12, and the effect of increasing the output force of the piston can be achieved.

[0050] Compared with the method of setting multiple hydraulic cylinders and making the pistons of multiple hydraulic cylinders press against the part to be pushed at the same time in the related art, the above-mentioned technical scheme provides a hydraulic cylinder assembly 100 provided in the present invention, the end face of which is used to press against the part to be pushed is the fourth end face 222 of the second piston 22. It can ensure that the force on the part to be pushed is uniform while ensuring the lifting output force, and can act on the smaller part to be pushed, thereby avoiding the situation in the related art where multiple pistons act on the part to be pushed at the same time, resulting in uneven force on the part to be pushed, or the situation where it is difficult to press the pistons of multiple hydraulic cylinders against the smaller part to be pushed at the same time. Compared with the method of setting multiple hydraulic cylinders in series in the related art, the above-mentioned technical scheme can only be achieved by increasing the number of hydraulic cylinders in series when it is necessary to further improve the output force of the entire hydraulic cylinder assembly. The present invention can achieve the effect of further improving the output force of the entire hydraulic cylinder assembly 100 by adjusting the area ratio of the third end face 221 and the second end face 122 on the basis of keeping the number of hydraulic cylinders unchanged; that is, when the same number of hydraulic cylinders are set, the hydraulic cylinder assembly 100 provided by the present invention can provide a greater output force than the method of setting multiple hydraulic cylinders in series in the related art.

[0051] The area of ​​the first end face 121 of the first piston 12 is larger than the area of ​​the second end face 122 thereof, and the area of ​​the third end face 221 of the second piston 22 is larger than the area of ​​the second end face 122 of the first piston 12, so that the output force of the second piston 22 can be greater than the input force of the first piston 12. For ease of understanding, the following will refer to Figure 8 The exemplary embodiments shown are computationally illustrative.

[0052] like Figure 8 As shown, let the area of ​​the first end face 121 be S1, let the area of ​​the second end face 122 be S2, let the area of ​​the third end face 221 be S3, the input force applied to the first piston 12, that is, the force received by the first end face 121 of the first piston 12 is F1, the force output by the second end face 122 of the first piston 12 is F2, and the force received by the third end face 221 of the second piston 22 is F3. According to the formulas of force, pressure and area, it can be known that: F1=P1S1, F2=P2S2, F3=P3S3. When the pressure in the hydraulic cylinder is the same, that is, P1=P2=P3, since the force received by the first piston 12 is the same as the force output by the first piston 12, that is, F1=F2, it can be obtained that That is to say, The force F3 received by the second piston 22 is equal to the force F4 output by the second piston 22. Therefore, the force F4 output by the second piston 22 is equal to the force F3 received by the second piston 22. In other words, the output force of the second piston 22 is equal to the ratio of the area of ​​the third end face 221 to the area of ​​the second end face 122 multiplied by the input force, and the area of ​​the third end face 221 is larger than the area of ​​the second end face 122. The output force of the hydraulic cylinder assembly provided by the present invention is greater than its input force, which can achieve the effect of increasing the output force.

[0053] Optionally, the first cylinder body 11 includes a first cylinder groove 13, the first piston 12 is installed in the first cylinder groove 13, the second cylinder body 21 includes a second cylinder groove 23, and the second piston 22 is installed in the second cylinder groove 23. The inner diameter of the first cylinder groove 13 is equal to the outer diameter of the first end face 121, the inner diameter of the second cylinder groove 23 is equal to the outer diameter of the third end face 221, the outer diameter of the first end face 121 is equal to the outer diameter of the third end face 221, and the ratio of the outer diameter of the third end face 221 to the outer diameter of the second end face 122 is greater than or equal to 2. The first cylinder body 11 and the second cylinder body 21 with the same inner diameter can achieve the same internal pressure. At this time, the magnitude of the output force will increase in multiples of the square of the ratio of the outer diameter of the third end face 221 to the outer diameter of the second end face 122.

[0054] Specifically, the output force is calculated by taking the ratio of the outer diameter of the third end face 221 to the outer diameter of the second end face 122 as 2 as an example: the outer diameter of the second end face 122 is D2, and the outer diameter of the third end face 221 is D3. Can get When the first cylinder 11 and the second cylinder 21 have the same inner diameter (ie, the oil pressure is the same), the output force of the second piston 22 is four times the input force received by the first piston 12 .

[0055] Here, it should be noted that the hydraulic cylinder assembly 100 mentioned above can be applied to any appropriate technical field. For example, the hydraulic cylinder assembly 100 can be applied to a hydraulic brake device of a vehicle. It can be understood that when the hydraulic cylinder assembly 100 is applied to the hydraulic brake device, the fourth end surface 222 of the second piston 22 is used to push the brake pad to move so that the brake pad can press the friction pad to achieve braking. It can be understood that in the case where the hydraulic cylinder assembly 100 is applied to the hydraulic brake device, the first cylinder body 11 can be installed on the brake caliper body, or it can be integrally formed with the brake caliper body (that is, the first cylinder body 11 is a part of the brake caliper body, or the first cylinder groove of the first cylinder body 11 is formed on the brake caliper body).

[0056] The first hydraulic cylinder 1 and the second hydraulic cylinder 2 mentioned above may be connected to each other or not directly connected to each other, and the number of the first hydraulic cylinder 1 may be one or more, which is not specifically limited in the present disclosure.

[0057] For the case where the first hydraulic cylinder 1 and the second hydraulic cylinder 2 are connected to each other, in the first embodiment provided by the present disclosure, as Figures 1 to 8 As shown, the second cylinder body 21 of the present disclosure can be connected to the first cylinder body 11, and a second through hole 211 for the first piston 12 to pass through is formed on the second cylinder body 21, and the second end surface 122, the inner surface of the second cylinder body 21 and the third end surface 221 jointly define the second oil chamber 4. In this way, when the number of the first hydraulic cylinder 1 of the hydraulic cylinder assembly 100 of the present disclosure is one, and the first cylinder body 11 of the first hydraulic cylinder 1 and the second cylinder body 21 of the second hydraulic cylinder 2 are connected to each other, the entire hydraulic cylinder assembly 100 can be made highly integrated, small in size, and small in space, and the hydraulic cylinder assembly 100 can be installed as a whole.

[0058] In the second embodiment of the present disclosure, Fig. 9 As shown, there are multiple first hydraulic cylinders 1, and the first cylinder bodies 11 of the multiple first hydraulic cylinders 1 are connected in sequence. The first through hole 111 on the first cylinder body 11 of the first hydraulic cylinder 1 located at the head end of the multiple first hydraulic cylinders 1 is used to communicate with the oil supply source, and the first cylinder body 11 of the first hydraulic cylinder 1 located at the tail end of the multiple first hydraulic cylinders 1 is connected to the second cylinder body 21. The first piston 12 of the first hydraulic cylinder 1 of each adjacent two first hydraulic cylinders 1 passes through the first through hole 111 on the first cylinder body 11 of the next first hydraulic cylinder 1, and the first piston 12 of the first hydraulic cylinder 1 located at the tail end of the multiple first hydraulic cylinders 1 passes through the second through hole 211, and the second end face 122 of the first piston 12 and the inner surface and third end face 221 of the second cylinder body 21 jointly define the second oil chamber 4. In this way, compared with the technical solution of setting one first hydraulic cylinder 1, this embodiment can further improve the output force of the second piston 22.

[0059] For the case where the first hydraulic cylinder 1 and the second hydraulic cylinder 2 are not directly connected to each other, in the third embodiment of the present disclosure, as Fig.11 As shown, the second end face 122 and the inner surface of the first cylinder body 11 define the first sub-oil chamber 41 together, the third end face 221 and the inner surface of the second cylinder body 21 define the second sub-oil chamber 42 together, the first sub-oil chamber 41 is connected with the second sub-oil chamber 42 through the first oil delivery pipe 81, and the first sub-oil chamber 41, the oil passage inside the first oil delivery pipe 81 and the second sub-oil chamber 42 together constitute the second oil chamber 4. In this way, the first cylinder body 11 and the second cylinder body 21 can be placed separately, and the second cylinder body 21 can be placed at the position where the output force is required, so that the requirements for the installation space can be further reduced, and it can be suitable for a more limited installation space.

[0060] In the fourth embodiment provided by the present disclosure, Fig.12As shown, there are multiple first hydraulic cylinders 1, and the first cylinder bodies 11 of the multiple first hydraulic cylinders 1 are sequentially connected in series through the second oil delivery pipe 82. The first through hole 111 on the first cylinder body 11 of the first hydraulic cylinder 1 located most upstream among the multiple first hydraulic cylinders 1 is used to communicate with the oil supply source. The second end face 122 of the first piston 12 of the first hydraulic cylinder 1 located most downstream among the multiple first hydraulic cylinders 1 and the inner surface of the first cylinder body 11 of the first hydraulic cylinder 1 jointly define the first sub-oil chamber 41. The second end face 122 of the first piston 12 of the first hydraulic cylinder 1 located upstream among every two adjacent first hydraulic cylinders 1 and the inner surface of the first cylinder body 11 of the first hydraulic cylinder 1 jointly define the third oil chamber 83. The third oil chamber 83 is connected to the first oil chamber 3 of the first hydraulic cylinder 1 located downstream among every two adjacent first hydraulic cylinders 1 through the second oil delivery pipe 82. In this way, the multiple first hydraulic cylinders 1 can be placed separately, and the second hydraulic cylinder 2 can be placed at the position where the output force is required. In this way, the requirements for the installation space can be further reduced, and it can be suitable for a more limited installation space.

[0061] In the fifth embodiment provided by the present disclosure, Fig.13 As shown, there are multiple first hydraulic cylinders 1, and the first cylinder bodies 11 of the multiple first hydraulic cylinders 1 are connected in sequence. The first through hole 111 on the first cylinder body 11 of the first hydraulic cylinder 1 located at the head end of the multiple first hydraulic cylinders 1 is used to communicate with the oil supply source. The second end surface 122 of the first piston 12 of the first hydraulic cylinder 1 located at the tail end of the multiple first hydraulic cylinders 1 and the inner surface of the first cylinder body 11 of the first hydraulic cylinder 1 jointly define the first sub-oil chamber 41. The first piston 12 of the first hydraulic cylinder 1 of each adjacent two first hydraulic cylinders 1 passes through the first through hole 111 on the first cylinder body 11 of the next first hydraulic cylinder 1. In this way, the multiple first hydraulic cylinders 1 can be connected to each other and placed in the same position, and the second hydraulic cylinder 2 can be placed at the location where the output force is required, reducing the requirements for the installation space.

[0062] Optional, such as Figure 2 , Figure 8 , Fig. 9 As shown, in the case where the second cylinder body 21 is connected to the first cylinder body 11, at least part of the second cylinder body 21 is located in the first cylinder body 11. In this way, the axial length of the hydraulic cylinder assembly 100 can be further reduced, and the overall volume of the hydraulic cylinder assembly 100 can be reduced, so that the hydraulic cylinder assembly 100 can be suitable for installation environments with limited space without affecting the output force.

[0063] Optionally, in the case where there are multiple first hydraulic cylinders 1 and they are connected to each other, as Fig. 9 and Fig.13As shown, the first cylinder body 11 of one of the two adjacent first hydraulic cylinders 1 is at least partially located in the first cylinder body 11 of the other first hydraulic cylinder 1. In this way, the axial length of the hydraulic cylinder assembly 100 can be further reduced, and the overall volume of the hydraulic cylinder assembly 100 can be reduced.

[0064] Optional, such as Figure 2 , Figure 5 and Fig. 9 As shown, the first piston 12 may include a piston body 123 and a piston rod 124 protruding from the piston body 123, the piston rod 124 is used to pass through the second through hole 211, the end face of the piston body 123 away from the piston rod 124 is the first end face 121, the end face of the piston rod 124 away from the piston body 123 is the second end face 122, and a first air gap 51 is provided between the end of the piston body 123 close to the piston rod 124 and the outer surface of the second cylinder body 21, a first air vent 52 connected to the first air gap 51 is formed on the first cylinder body 11, a first oil replenishing hole 61 connected to the first air gap 51 and the second oil chamber 4 is formed on the second cylinder body 21, and a first oil replenishing pipe 62 passes through the first air vent 52 and the first oil replenishing hole 61 and is connected to the second oil chamber 4.

[0065] In the above embodiment, the first air vent 52 has a dual function. The first function is to connect the first air gap 51 with the outside atmosphere through the first air vent 52, so as to maintain the first air gap 51 consistent with the outside atmospheric pressure at all times, thereby ensuring that the movement of the first piston 12 is not affected by the air pressure in the first air gap 51; the second function is to serve as an entry hole for the first oil replenishment pipe 62 to replenish the oil in the second oil chamber 4, thereby avoiding the need to open another opening for the first oil replenishment pipe 62 to penetrate at other positions of the first cylinder body 11, thereby reducing the number of openings on the first cylinder body 11, which is beneficial to enhancing the structural strength of the first cylinder body 11.

[0066] It is understandable that if Figure 2 and Fig. 9 As shown, a corresponding cut-off valve 63 may be provided on the first oil replenishing pipe 62 to cut off the first oil replenishing pipe 62 after the second oil chamber 4 is filled with hydraulic medium, so that the second oil chamber 4 is in a sealed state.

[0067] Optional, such as Figure 2 As shown, the central axis of the first air vent 52 and the central axis of the first oil replenishing hole 61 are located in the same plane parallel to the moving direction of the first piston 12. In this way, the air outlet of the first air vent 52 and the oil inlet of the first oil replenishing hole 61 can be spaced relatively short, so that the first oil replenishing pipe 62 can directly enter the first oil replenishing hole 61 on a relatively short path after passing through the first air vent 52. In other words, the first oil replenishing pipe 62 can have a relatively short length to shorten the oil replenishing path.

[0068] Of course, other embodiments may also be used to replenish the oil in the second oil chamber 4. For example, in one embodiment of the present disclosure, Fig.10 As shown, a first oil replenishing port 71 communicating with the second oil chamber 4 is formed on the second piston 22. A first stop valve 72 is provided at the first oil replenishing port 71; or a detachable first blocking member 73 is provided at the first oil replenishing port 71. In this way, the second oil chamber 4 can be replenished directly through the first oil replenishing port 71 without opening the second cylinder body 21, which is conducive to enhancing the structural strength and sealing performance of the second cylinder body 21.

[0069] In another embodiment of the present disclosure, Figures 11 to 13 As shown, a second oil replenishing port 213 communicating with the second sub-oil chamber 42 is formed on the second cylinder body 21, and a second stop valve 214 or a detachable second blocking member 215 is provided at the second oil replenishing port 213. In this way, the second sub-oil chamber 42 can be replenished with oil through the second oil replenishing port 213, and then the hydraulic oil in the second sub-oil chamber 42 is kept at oil pressure during braking through the second stop valve 214 or the second blocking member 215.

[0070] Among them, Fig.12 As shown, a fourth oil replenishing pipe 821 may be connected to the second oil delivery pipe 82, and a fourth stop valve 822 may be provided on the fourth oil replenishing pipe 821. The second oil delivery pipe 82 may be replenished with oil through the fourth oil replenishing pipe 821, thereby replenishing the third oil chamber 83 and the first oil chamber 3 connected to the second oil delivery pipe 82, and the fourth stop valve 822 may be used to ensure that the second oil delivery pipe 82, the first oil chamber 3, and the third oil chamber 83 can all maintain oil pressure during braking.

[0071] At the same time, if Figures 11 to 13 As shown, a third oil replenishing pipe 811 may be connected to the first oil delivery pipe 81, and a third stop valve 812 may be provided on the third oil replenishing pipe 811. The first oil delivery pipe 81 is directly replenished with oil through the third oil replenishing pipe 811, so as to replenish the first sub-oil chamber 41 and the second sub-oil chamber 42 connected with the first oil delivery pipe 81, and the third stop valve 812 may be used to ensure that the first oil delivery pipe 81, the first sub-oil chamber 41 and the second sub-oil chamber 42 can all maintain oil pressure during braking.

[0072] In the case where there are multiple first hydraulic cylinders 1 and they are connected to each other in the above embodiment, in order to facilitate the replenishment of oil in the first oil chambers 3 in at least some of the multiple first hydraulic cylinders 1, as shown in FIG. Fig. 9 and Fig.13As shown, there is a second air gap 53 between the piston body 123 of the first piston 12 of the first hydraulic cylinder 1 of each two adjacent first hydraulic cylinders 1 and the first cylinder body 11 of the next first hydraulic cylinder 1, a second air vent 54 is formed on the first cylinder body 11 of the first hydraulic cylinder 1 of each two adjacent first hydraulic cylinders 1, and a second oil replenishing hole 64 is formed on the first cylinder body 11 of the next first hydraulic cylinder 1, and a second oil replenishing pipe 65 passes through the second air vent 54 and the second oil replenishing hole 64 to communicate with the first oil chamber 3 of the next first hydraulic cylinder 1.

[0073] Optionally, the central axis of the second air vent 54 and the central axis of the second oil replenishing hole 64 are located in the same plane parallel to the moving direction of the first piston 12 , so that the second oil replenishing pipe 65 passes through the second air vent 54 and the second oil replenishing hole 64 .

[0074] Optionally, in the case where the first cylinder body 11 and the second cylinder body 21 are connected to each other, in order to achieve the connection between the first cylinder body 11 and the second cylinder body 21, as shown in FIG. Figure 4 As shown, a first mounting boss 112 is formed on the first cylinder body 11, a second mounting boss 212 is formed on the second cylinder body 21, a first mounting hole for a fastener to pass through is formed on the first mounting boss 112, and a second mounting hole for a fastener to pass through is formed on the second mounting boss 212. In this way, the first cylinder body 11 and the second cylinder body 21 can be firmly mounted, which is conducive to enhancing the integrity and structural strength of the hydraulic cylinder assembly 100.

[0075] Optionally, in the case where there are multiple first cylinder bodies 11 that are connected to each other, the multiple first cylinder bodies 11 can be welded together or connected together via multiple first mounting bosses 112 .

[0076] Optionally, the first mounting hole may be a threaded hole, the second mounting hole may be a countersunk hole, and the fastener may be a countersunk bolt.

[0077] Alternatively, if Figure 2 and Figure 3 As shown, an annular groove 91 is formed on the inner surface of the second cylinder body 21, and an annular sealing ring 93 is sleeved on the outer peripheral surface of the second piston 22. The annular sealing ring 93 is located in the annular groove 91, and a chamfer 92 is formed on the side wall of the annular groove 91 away from the third end face 221. In this way, on the one hand, the annular sealing ring 93 can seal the gap between the second piston 22 and the second cylinder body 21 to prevent the oil in the second oil chamber 4 from leaking; on the other hand, when the second piston 22 loses pressure, the annular sealing ring 93 can rebound to drive the second piston 22 to reset. Among them, the chamfer 92 is helpful to accommodate the deformed annular sealing ring 93, and helps to increase the deformation of the annular sealing ring 93, providing a greater rebound force for the reset of the second piston 22.

[0078] In the above embodiment, the working process / working principle of the annular seal ring 93 is as follows: when the second piston 22 is pushed by the first piston 12, the annular seal ring 93 deforms to a certain extent in the moving direction of the second piston 22 along with the movement of the second piston 22. When the second piston 22 loses pressure (i.e., when the first hydraulic cylinder 1 loses the hydraulic action), the annular seal ring 93 recovers the deformation and drives the second piston 22 to reset.

[0079] In the case where there are multiple first hydraulic cylinders 1, optionally, the areas of the first end faces 121 of the multiple first pistons 12 are the same, and the areas of the second end faces 122 of the multiple first pistons 12 are the same. In this way, on the one hand, the output force can be controlled by controlling the number of the first pistons 12, which is conducive to controlling the output force; on the other hand, it is conducive to establishing standardized accessories, which is very convenient for processing, installation, replacement and maintenance.

[0080] According to another aspect of the present disclosure, a hydraulic brake device is provided, including the above-mentioned hydraulic cylinder assembly 100, a brake pad and a friction pad, and the fourth end surface 222 of the second piston 22 is used to abut the brake pad and push the brake pad to move toward the friction pad to compress the friction pad.

[0081] The hydraulic brake device configured in this way can provide a greater output force through the second piston 22 of the hydraulic cylinder assembly 100, so that the braking effect of the brake pad is better. In addition, the hydraulic cylinder assembly 100 disclosed in the present invention has a small requirement for installation space and can be suitable for limited installation space. When the above-mentioned hydraulic cylinder assembly 100 is applied to the hydraulic brake device, under the same braking force requirement, the hydraulic cylinder assembly 100 disclosed in the present invention can have a smaller cylinder diameter and a smaller number of hydraulic cylinders, which is conducive to realizing the miniaturization, lightness and high efficiency of the hydraulic cylinder in the hydraulic brake device.

[0082] According to another aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned hydraulic brake device. The vehicle provided with the above-mentioned hydraulic brake device can have a more stable and powerful braking effect, thereby improving the braking safety of the vehicle.

[0083] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0085] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A hydraulic cylinder assembly, characterized in that: The invention comprises a first hydraulic cylinder and a second hydraulic cylinder, wherein the first hydraulic cylinder comprises a first cylinder body and a first piston movably mounted on the first cylinder body, and the second hydraulic cylinder comprises a second cylinder body and a second piston movably mounted on the second cylinder body; The first piston has a first end face and a second end face opposite to each other along its moving direction, the second piston has a third end face and a fourth end face opposite to each other along its moving direction, the first end face and the inner surface of the first cylinder body jointly define a first oil chamber, a second oil chamber is defined between the second end face and the third end face, and a first through hole communicating with the first oil chamber is formed on the first cylinder body; Wherein, the area of ​​the first end surface is larger than the area of ​​the second end surface, and the area of ​​the third end surface is larger than the area of ​​the second end surface; The first cylinder body comprises a first cylinder groove, the first piston is installed in the first cylinder groove, the second cylinder body comprises a second cylinder groove, the second piston is installed in the second cylinder groove; The inner diameter of the first cylinder groove is equal to the outer diameter of the first end face, the inner diameter of the second cylinder groove is equal to the outer diameter of the third end face, the outer diameter of the first end face is equal to the outer diameter of the third end face, and the ratio of the outer diameter of the third end face to the outer diameter of the second end face is greater than or equal to 2.

2. The hydraulic cylinder assembly according to claim 1, characterized in that: The second cylinder body is connected to the first cylinder body. A second through hole for the first piston to pass through is formed on the second cylinder body. The second end surface, the inner surface of the second cylinder body and the third end surface jointly define the second oil chamber.

3. The hydraulic cylinder assembly according to claim 2, characterized in that: At least a portion of the second cylinder is located within the first cylinder.

4. The hydraulic cylinder assembly according to claim 2, characterized in that: There are multiple first hydraulic cylinders, and the first cylinder bodies of the multiple first hydraulic cylinders are connected in sequence. The first through hole on the first cylinder body of the first hydraulic cylinder located at the head end of the multiple first hydraulic cylinders is used to communicate with the oil supply source. The first cylinder body of the first hydraulic cylinder located at the tail end of the multiple first hydraulic cylinders is connected to the second cylinder body. The first piston of the first hydraulic cylinder of each adjacent two first hydraulic cylinders passes through the first through hole on the first cylinder body of the next first hydraulic cylinder. The first piston of the first hydraulic cylinder located at the tail end of the multiple first hydraulic cylinders passes through the second through hole, and the second end surface of the first piston, the inner surface of the second cylinder body and the third end surface jointly define the second oil chamber.

5. The hydraulic cylinder assembly according to claim 4, characterized in that: The first cylinder body of one of the two adjacent first hydraulic cylinders is at least partially located in the first cylinder body of the other first hydraulic cylinder.

6. The hydraulic cylinder assembly according to any one of claims 2 to 5, characterized in that: The first piston includes a piston body and a piston rod protruding from the piston body, the piston rod is used to pass through the second through hole, the end face of the piston body away from the piston rod is the first end face, the end face of the piston rod away from the piston body is the second end face, a first air gap is provided between an end of the piston body close to the piston rod and an outer surface of the second cylinder body, a first air vent hole connected to the first air gap is formed on the first cylinder body, a first oil replenishing hole connected to the first air gap and the second oil chamber is formed on the second cylinder body, and a first oil replenishing pipe passes through the first vent hole and the first oil replenishing hole and is connected to the second oil chamber.

7. The hydraulic cylinder assembly according to claim 6, characterized in that: A central axis of the first vent hole and a central axis of the first oil replenishing hole are located in the same plane parallel to the moving direction of the first piston.

8. The hydraulic cylinder assembly according to any one of claims 1 to 5, characterized in that: The second piston is formed with a first oil replenishing port communicating with the second oil chamber; Wherein, a first stop valve is provided at the first oil replenishing port; or a detachable first blocking member is provided at the first oil replenishing port.

9. The hydraulic cylinder assembly according to any one of claims 2 to 5, characterized in that: A first mounting boss is formed on the first cylinder body, a second mounting boss is formed on the second cylinder body, a first mounting hole for a fastener to pass through is formed on the first mounting boss, and a second mounting hole for the fastener to pass through is formed on the second mounting boss.

10. The hydraulic cylinder assembly according to claim 1, characterized in that: The second end face and the inner surface of the first cylinder body jointly define a first sub-oil chamber, the third end face and the inner surface of the second cylinder body jointly define a second sub-oil chamber, the first sub-oil chamber is connected to the second sub-oil chamber through a first oil pipe, and the first sub-oil chamber, the oil channel inside the first oil pipe and the second sub-oil chamber jointly constitute the second oil chamber.

11. The hydraulic cylinder assembly according to claim 10, characterized in that: There are multiple first hydraulic cylinders, and the first cylinder bodies of the multiple first hydraulic cylinders are connected in series in sequence through the second oil delivery pipe. The first through hole on the first cylinder body of the first hydraulic cylinder located most upstream among the multiple first hydraulic cylinders is used to communicate with the oil supply source. The second end surface of the first piston of the first hydraulic cylinder located most downstream among the multiple first hydraulic cylinders and the inner surface of the first cylinder body of the first hydraulic cylinder jointly define the first sub-oil chamber. The second end surface of the first piston of the first hydraulic cylinder located upstream among every two adjacent first hydraulic cylinders and the inner surface of the first cylinder body of the first hydraulic cylinder jointly define a third oil chamber. The third oil chamber is connected with the first oil chamber of the first hydraulic cylinder located downstream among every two adjacent first hydraulic cylinders through the second oil delivery pipe.

12. The hydraulic cylinder assembly according to claim 10, characterized in that: There are multiple first hydraulic cylinders, and the first cylinder bodies of the multiple first hydraulic cylinders are connected in sequence. The first through hole on the first cylinder body of the first hydraulic cylinder located at the head end of the multiple first hydraulic cylinders is used to communicate with the oil supply source. The second end surface of the first piston of the first hydraulic cylinder located at the tail end of the multiple first hydraulic cylinders and the inner surface of the first cylinder body of the first hydraulic cylinder jointly define the first sub-oil chamber, and the first piston of the previous first hydraulic cylinder of every two adjacent first hydraulic cylinders passes through the first through hole on the first cylinder body of the next first hydraulic cylinder.

13. The hydraulic cylinder assembly according to any one of claims 10 to 12, characterized in that: A second oil replenishing port communicating with the second sub-oil chamber is formed on the second cylinder body, and a second stop valve or a detachable second blocking member is provided at the second oil replenishing port; and / or, The first oil delivery pipe is connected to a third oil replenishment pipe, and the third oil replenishment pipe is provided with a third stop valve.

14. The hydraulic cylinder assembly according to any one of claims 4, 10 or 12, characterized in that: The first end surfaces of the plurality of first pistons have the same area, and the second end surfaces of the plurality of first pistons have the same area.

15. The hydraulic cylinder assembly according to any one of claims 1-5, 10-12, characterized in that: An annular groove is formed on the inner surface of the second cylinder body, an annular sealing ring is sleeved on the outer circumferential surface of the second piston, the annular sealing ring is located in the annular groove, and a chamfer is formed on the side wall of the annular groove away from the third end surface.

16. A hydraulic brake device, characterized in that: It comprises a hydraulic cylinder assembly, a brake pad and a friction pad according to any one of claims 1 to 15, wherein the fourth end surface of the second piston is used to abut against the brake pad and push the brake pad to move toward the friction pad to compress the friction pad.

17. A vehicle, characterized in that: Comprising a hydraulic brake device according to claim 16.

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