Piston pump, brake system and vehicle

Abstract

The invention discloses a piston pump, a brake system and a vehicle. The piston pump comprises a guide structure, a piston body and an anti-torsion structure. The piston body is arranged in the guide structure, and the piston body can move in the axial direction of the piston body relative to the guide structure; the anti-torsion structure is arranged between the piston body and the guide structure, the anti-torsion structure comprises an anti-torsion guide column and an anti-torsion guide groove, and the anti-torsion guide column is arranged on one of the piston body and the guide structure; the anti-torsion guide groove is formed in the other one of the piston body and the guide structure, and the anti-torsion guide column is arranged in the anti-torsion guide groove in a guiding fit mode so as to limit rotation of the piston body in the circumferential direction. And the gap between the anti-torsion guide column and the anti-torsion guide groove in the circumferential direction of the piston body is L, wherein L is larger than 0 and smaller than or equal to R + 0.2 * (N-1). Therefore, the piston body can be prevented from rotating in the circumferential direction, the transmission efficiency and the transmission precision of the piston body are improved, the transmission loss is reduced, the reliability and the stability of the piston pump are improved, and the service life of the anti-torsion structure is prolonged.

Description

Technical Field

[0001] This invention relates to the field of vehicle braking technology, and in particular to a piston pump, a braking system, and a vehicle. Background Technology

[0002] In the prior art, the circumferential positional accuracy between the piston body and the guide structure is low, resulting in poor anti-torsion performance of the piston body and easy circumferential rotation between the piston body and the guide structure. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a piston pump that can improve the torsional resistance of the piston body.

[0004] A second objective of the present invention is to provide a braking system comprising the piston pump described in the above embodiments.

[0005] A third objective of the present invention is to provide a vehicle comprising the piston pump or braking system described in the above embodiments.

[0006] According to a first aspect of the present invention, a piston pump includes: a guide structure, a piston body, and an anti-torsion structure; the piston body is disposed within the guide structure and is axially movable relative to the guide structure; the anti-torsion structure is disposed between the piston body and the guide structure, and the anti-torsion structure includes: an anti-torsion guide post and an anti-torsion guide groove; the anti-torsion guide post is disposed on one of the piston body and the guide structure; the anti-torsion guide groove is formed on the other of the piston body and the guide structure; the anti-torsion guide post is guided and fitted within the anti-torsion guide groove to limit the rotation of the piston body relative to the guide structure in the circumferential direction of the piston body; the gap between the anti-torsion guide post and the anti-torsion guide groove in the circumferential direction of the piston body is L, wherein L satisfies: 0 < L ≤ R + 0.2 × (N-1), where R is the gap between the piston body and the guide structure in the circumferential direction of the piston body, and N is the number of the anti-torsion structures.

[0007] According to the piston pump of the present invention, by providing an anti-torsion structure, the rotation of the piston body relative to the guide structure in the circumferential direction of the piston body can be avoided, thereby improving the anti-torsion performance of the piston body, improving the transmission efficiency and transmission accuracy of the piston body, reducing transmission loss, improving the reliability and stability of the piston pump, and extending the service life of the anti-torsion structure.

[0008] In some embodiments, L satisfies: 0.1mm ≤ L ≤ 0.35mm.

[0009] In some embodiments, the anti-torsion guide post or the anti-torsion guide groove on the guide structure has a length of X1 in the axial direction of the piston body; the piston body includes a support flange, the support flange is in contact with the guide structure, the distance of the support flange along the axial direction of the piston body is X2, and the length of the guide structure along the axial direction of the piston body is X, wherein X, X1, and X2 satisfy: X1+X2≥1 / 3X.

[0010] In some embodiments, there are multiple anti-torsion structures, and the multiple anti-torsion structures are evenly spaced along the circumference of the piston body.

[0011] In some embodiments, there are two anti-torsion structures, which are radially opposite to each other along the piston body; the anti-torsion guide post is disposed on the outer wall of the piston body, and the anti-torsion guide groove is formed on the inner wall of the guide structure.

[0012] In some embodiments, there are multiple guiding structures, including a first guiding structure and a second guiding structure, wherein the second guiding structure is disposed within the first guiding structure, the piston body is disposed within the second guiding structure, and the piston body is movable relative to the second guiding structure along the axial direction of the piston body; the anti-torsion structure is disposed between the second guiding structure and the piston body; and / or, the anti-torsion structure is disposed between the second guiding structure and the first guiding structure.

[0013] In some embodiments, one of the anti-torsion guide post and the anti-torsion guide groove is disposed on the second guide structure; the other of the anti-torsion guide post and the anti-torsion guide groove is disposed on the first guide structure; and / or, the other of the anti-torsion guide post and the anti-torsion guide groove is disposed on the piston body.

[0014] In some embodiments, the anti-torsion structure is at least disposed between the second guide structure and the piston body; the anti-torsion guide post is disposed on the inner wall of the second guide structure; the piston body includes a piston body and a support flange, the support flange is connected to one end of the piston body, and the anti-torsion guide groove is formed on the outer periphery of the support flange.

[0015] In some embodiments, the second guide structure is detachably connected to the first guide structure; or, the second guide structure is integrally connected to the first guide structure.

[0016] In some embodiments, the piston pump further includes a wear-resistant ring disposed between the guide structure and the piston body. The wear-resistant ring is in contact with both the guide structure and the piston body. The wear-resistant ring is disposed on the side of the guide structure away from the anti-torsion structure along the axial direction of the piston body, so as to jointly support the piston body.

[0017] In some embodiments, a groove is formed on the guide structure, and the wear-resistant ring is disposed in the groove; the radially inner side of the wear-resistant ring is located on the side of the inner wall of the guide structure corresponding to the groove portion adjacent to the central axis of the piston body.

[0018] In some embodiments, the wear-resistant ring is not in complete contact with the inner wall of the groove.

[0019] In some embodiments, the wear-resistant ring is a discontinuous ring structure.

[0020] The braking system according to a second aspect of the present invention includes the piston pump described in the above embodiments.

[0021] A vehicle according to a third aspect of the present invention includes the piston pump or braking system described in the above embodiments.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a cross-sectional schematic diagram of the piston body assembled only with the first guide structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the piston body being assembled only with the first guide structure according to an embodiment of the present invention; Figure 3 This is an exploded view of the assembly of the piston body and the second guide structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the assembly of the first guide structure, the second guide structure, and the piston body according to an embodiment of the present invention; Figure 5 yes Figure 4 Enlarged schematic diagram of region P in the middle; Figure 6 This is a schematic diagram showing the relationship between the circumferential clearance of the piston body and the guide structure and the noise value according to an embodiment of the present invention.

[0024] Figure label: 100. Piston pump; 10. First guiding structure; 11. Second guiding structure; 20. Piston body; 21. Piston body frame; 22. Support flange; 30. Torsional structure; 31. First torsional guide post; 32. First torsional guide groove; 33. Second torsional guide post; 34. Second torsional guide groove; 35. Third torsional guide post; 36. Third torsional guide groove; 37. Torsional guide post; 38. Torsional guide groove; 40. Wear-resistant ring. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-6 A piston pump 100 according to an embodiment of the present invention is described. The piston pump 100 includes: a guide structure, a piston body 20, and an anti-torsion structure 30.

[0026] Specifically, such as Figures 1-4 As shown, the piston body 20 is disposed within the guide structure, and the piston body 20 is movable relative to the guide structure along the axial direction of the piston body 20; the anti-torsion structure 30 is disposed between the piston body 20 and the guide structure, and the anti-torsion structure 30 includes: an anti-torsion guide post 37 and an anti-torsion guide groove 38. The anti-torsion guide post 37 is disposed on one of the piston body 20 and the guide structure, and the anti-torsion guide groove 38 is formed on the other of the piston body 20 and the guide structure. The anti-torsion guide post 37 is guided and fitted within the anti-torsion guide groove 38. The anti-torsion structure 30 is used to limit the rotation of the piston body 20 relative to the guide structure in the circumferential direction of the piston body 20.

[0027] Optionally, the anti-torsion guide post 37 can be provided on the piston body 20 or the guide structure, and the anti-torsion guide groove 38 can be provided on the piston body 20 or the guide structure. Optionally, both the anti-torsion guide post 37 and the anti-torsion guide groove 38 can be provided on the piston body 20 or the guide structure.

[0028] In this embodiment, taking the anti-torsion guide post 37 disposed on the guide structure and the anti-torsion guide groove 38 disposed on the piston body 20 as an example, both the anti-torsion guide post 37 and the anti-torsion guide groove 38 extend along the axial direction of the piston body 20. One side of the anti-torsion guide post 37 is connected to the inner wall of the guide structure, and the other side of the anti-torsion guide post 37 protrudes towards the center of the guide structure along the radial direction of the piston body 20. The anti-torsion guide groove 38 is disposed on the piston body 20 and first contacts one end or surface of the guide structure along the axial direction of the piston body 20. The anti-torsion guide post 37 and the anti-torsion guide groove 38 form a movable guide fit along the axial direction of the piston body 20, and the anti-torsion guide post 37 and the anti-torsion guide groove 38 form a fit along the circumferential direction of the piston body 20.

[0029] By rationally distributing the anti-torsion guide column 37 and the anti-torsion guide groove 38 onto the piston body 20 or the guide structure, the anti-torsion structure 30 provides guidance for the reciprocating motion of the piston body 20 along the axial direction of the piston body 20, thereby improving the transmission efficiency of the piston body 20. At the same time, it avoids the rotation of the piston body 20 relative to the guide structure in the circumferential direction of the piston body 20, optimizes the stress condition of the piston body 20, and improves the stability and reliability of the piston body 20 during transmission. This results in higher precision in the movement of the piston body 20 within the guide structure and extends the service life of the piston pump 100.

[0030] Optionally, the anti-torsion guide post 37 is provided on the piston body 20, and the anti-torsion guide groove 38 is provided on the guide structure.

[0031] like Figure 4 and Figure 5 As shown, the gap between the anti-torsion guide post 37 and the anti-torsion guide groove 38 in the circumferential direction of the piston body 20 is L, where L satisfies: 0<L≤R+0.2×(N-1), where R is the gap between the piston body 20 and the guide structure in the circumferential direction of the piston body 20, and N is the number of anti-torsion structures 30.

[0032] When the anti-torsion guide post 37 abuts against the edge of the corresponding anti-torsion guide groove 38 on one side of the piston body 20 along the circumference, a gap is formed between the other side of the anti-torsion guide post 37 along the circumference of the piston body 20 and the edge of the corresponding anti-torsion guide groove 38. When gaps are formed between both sides of the anti-torsion guide post 37 along the circumference of the piston body 20 and the edge of the corresponding anti-torsion guide groove 38, the gaps on both sides are L1 and L2, respectively, where L1 + L2 = L. According to the above formula, the gap between the anti-torsion guide post 37 and the anti-torsion guide groove 38 in the circumference of the piston body 20 is determined by the gap between the piston body 20 and the guide structure in the circumference of the piston body 20, and the number of anti-torsion structures 30.

[0033] Optionally, when simulating the impact between a piston body 20 with a circumferential clearance R of 0.1mm-0.4mm and a guiding structure, where the guiding structure is a guiding sleeve, the simulation results of the clearance and sound pressure are as follows: Figure 6 As shown, during the transmission process of piston body 20, the larger the gap between piston body 20 and guide structure in the circumferential direction of piston body 20, the greater the impact force between piston body 20 and guide structure, and the greater the noise value generated. That is, within the allowable range, the gap between piston body 20 and guide structure in the circumferential direction of piston body 20 can be minimized as much as possible, thereby minimizing the impact of the impact.

[0034] Therefore, by reducing the circumferential clearance between the piston body 20 and the guide structure and the number of anti-torsion structures 30, the circumferential clearance between the anti-torsion guide pillars 37 and the anti-torsion guide grooves 38 in the piston body 20 can be reduced. This ensures the assembly accuracy of the piston body 20 and the guide structure, improves the stress condition of the anti-torsion structure 30, thereby reducing the internal friction of the piston pump 100, reducing transmission loss, improving transmission efficiency, reducing the risk of fatigue fracture of the anti-torsion structure 30, and extending the service life of the piston pump 100. At the same time, it reduces the noise generated by the piston body 20 during transmission and improves the NVH performance of the vehicle.

[0035] Optionally, according to the dynamic equation: F=ma+cv+kx, due to the increased circumferential clearance, the impact load (kx) caused by the displacement of the piston body 20 increases. With constant acceleration, the additional load (cv) from the damping force of the piston pump 100 increases, which easily leads to an increased probability of dry friction during transmission, an increase in the actual friction coefficient, and an increase in resistance. This results in a decrease in the transmission efficiency of the piston pump 100 and an increase in internal wear. Therefore, by controlling the circumferential clearance, the load caused by the damping force is reduced, the impact of friction is minimized, and the transmission efficiency is improved. Where m is the mass, a is the acceleration, c is the damping coefficient, v is the velocity, k is the spring constant, and x is the displacement.

[0036] Furthermore, the gap between the anti-torsion guide post 37 and the anti-torsion guide groove 38 in the circumferential direction of the piston body 20 is L, where L satisfies: 0.1mm ≤ L ≤ 0.35mm. To facilitate reducing the gap and noise, preferably, when R is 0.1mm and the number of anti-torsion structures 30 is N=3, the gap between the anti-torsion guide post 37 and the anti-torsion guide groove 38 in the circumferential direction of the piston body 20 is L=0.1+0.2×(3-1)=0.5mm. When the number of anti-torsion structures 30 is N=2, the gap L=0.1+0.2×(2-1)=0.3mm. When R is 0.15mm, the gap between the anti-torsion guide post 37 and the anti-torsion guide groove 38 in the circumferential direction of the piston body 20 is L=0.15+0.2×(3-1)=0.55mm. When the number of anti-torsion structures 30 is N=2, the gap L=0.15+0.2×(2-1)=0.35mm. In this application, the gap L is preferably 0.35mm or less to further reduce wear, improve transmission accuracy, and ensure torsional stiffness.

[0037] Optionally, when the gap between the anti-torsion guide post 37 and the anti-torsion guide groove 38 in the circumferential direction of the piston body 20 is less than 0.1 mm, the gap is too small, resulting in greater frictional resistance. This can easily increase the assembly difficulty of the guide structure and the piston body 20, and reduce the production efficiency of the piston pump 100. When the gap between the anti-torsion guide post 37 and the anti-torsion guide groove 38 in the circumferential direction of the piston body 20 is greater than 0.35 mm, the gap is too large, which may cause dry friction between the guide structure and the piston body 20 during transmission. This can lead to the risk of uneven wear on the anti-torsion structure 30, and noise may be generated during the transmission of the piston body 20. For example, L can be 0.1 mm, 0.2 mm, or 0.35 mm.

[0038] By limiting the gap range of the anti-torsion guide post 37 and the anti-torsion guide groove 38 in the circumferential direction of the piston body 20, the assembly accuracy of the anti-torsion guide post 37 and the anti-torsion guide groove 38 is ensured, the transmission loss is reduced, the transmission efficiency is improved, the service life of the piston pump 100 is extended, the noise generated by the piston body 20 during the transmission process is reduced, the reliability and stability of the piston body 20 during the transmission process are improved, and the NVH performance of the vehicle is enhanced.

[0039] According to the piston pump 100 of the present invention, by providing an anti-torsion structure 30, the rotation of the piston body 20 relative to the guide structure in the circumferential direction of the piston body 20 can be avoided, thereby improving the anti-torsion performance of the piston body 20, improving the transmission efficiency and transmission accuracy of the piston body 20, reducing transmission loss, improving the reliability and stability of the piston pump 100, and extending the service life of the anti-torsion structure 30.

[0040] Optionally, such as Figure 3 As shown, the anti-torsion guide post 37 extends axially along the piston body 20. In this application, the piston body 20 reciprocates within the guide structure along its axial direction. The guide structure is a hydraulic cylinder or a guide sleeve. The piston pump 100 can be used for pressure building and depressurization of the braking system. During pressure building, the piston body 20 in the piston pump 100 moves, pumping fluid from the guide structure into the hydraulic block of the hydraulic unit. The hydraulic block can transmit pressure to the brake caliper to produce a braking effect, thereby achieving vehicle braking. The anti-torsion structure 30 is radially disposed between the piston body 20 and the guide structure on adjacent sides, and extends axially along the piston body 20. The anti-torsion structure 30 is adapted to prevent relative rotation between the piston body 20 and the guide structure in the circumferential direction of the piston body 20, ensuring the accuracy of the piston body 20's movement within the guide structure.

[0041] Therefore, the anti-torsion guide post 37 can provide precise guidance for the anti-torsion guide groove 38, ensuring the displacement and directional accuracy of the piston body 20. At the same time, increasing the contact area between the anti-torsion guide post 37 and the anti-torsion guide groove 38 can better achieve the anti-torsion effect in the circumferential direction of the piston body 20.

[0042] Optionally, the number of torsion-resistant structures 30 is N, where N satisfies: 1 < N ≤ 3, and N is a positive integer.

[0043] Optionally, when the number of anti-torsion structures 30 is greater than three, the excessive number of anti-torsion structures 30 may lead to increased friction between the anti-torsion structures 30 and the piston body 20 and the guide structure, easily causing frictional vibration and wear, and reducing the transmission efficiency of the piston body 20. For example, N=2 or N=3.

[0044] Therefore, by limiting the number of anti-torsion structures 30, the load torque of a single anti-torsion structure 30 can be reduced to the greatest extent, the risk of fatigue fracture of the anti-torsion structure 30 can be reduced, and the service life of the anti-torsion structure 30 can be extended.

[0045] According to some embodiments of the present invention, such as Figures 1-3 As shown, the anti-torsion guide post 37 or anti-torsion guide groove 38 on the guide structure has a length of X1 in the axial direction of the piston body 20. The piston body 20 includes a support flange 22, which contacts the guide structure. The distance of the support flange 22 along the axial direction of the piston body 20 is X2. The lengths of the guide structure along the axial direction of the piston body 20 are X, X1, and X2, which satisfy: X1 + X2 ≥ 1 / 3X. The support flange 22 is located at the end of the piston body 20 that first contacts the guide structure along the axial direction of the piston body 20. The support flange 22 is located at the end of the piston body 20 that guides and engages with the guide structure. The radial diameter of the support flange 22 along the piston body 20 is greater than the radial diameter of the piston body 21. The support flange 22 extends circumferentially along the piston body 20.

[0046] For example, the guide structure is provided with an anti-torsion guide post 37, and the support flange 22 is provided with an anti-torsion guide groove 38. The length of the anti-torsion guide post 37 along the axial direction of the piston body 20, that is, the length of the anti-torsion guide post 37 supported or fixed by the guide structure, is X1. The length of the anti-torsion guide post 37 fixed by the anti-torsion guide groove 38 along the axial direction of the piston body 20, that is, the length of the support flange 22 along the axial direction of the piston body 20, is X2. The sum of the lengths of X1 and X2 along the axial direction of the piston body 20 accounts for more than one-third of the length of the guide structure along the axial direction of the piston body 20.

[0047] Therefore, by limiting the length of the anti-torsion guide post 37 or the anti-torsion guide groove 38 provided on the guide structure in the axial direction of the piston body 20 and the distance of the support flange 22 along the axial direction of the piston body 20, the amplitude of noise vibration during transmission can be suppressed, thereby reducing noise, reducing vibration during transmission, improving stability during transmission, and enhancing the NVH performance of the vehicle.

[0048] According to some embodiments of the present invention, such as Figure 1 and Figure 4 As shown, there are multiple anti-torsion structures 30, which are evenly spaced along the circumference of the piston body 20.

[0049] In this embodiment, there are three anti-torsion structures 30. The three anti-torsion structures 30 are evenly spaced along the circumference of the piston body 20, and the center lines of the three anti-torsion structures 30 intersect on the central axis of the piston body 20.

[0050] Therefore, by setting multiple anti-torsion structures 30, the anti-torsion performance of the piston body 20 can be improved, the load torque of a single anti-torsion structure 30 can be reduced, and the risk of fatigue fracture of the anti-torsion structure 30 can be reduced. By arranging multiple anti-torsion structures 30 evenly at intervals along the circumference of the piston body 20 and optimizing the arrangement of the anti-torsion structures 30, uneven force distribution on the piston body 20 can be avoided, radial force can be avoided, uneven wear of the piston body 20 or the guide structure can be avoided, and the transmission efficiency of the piston body 20 can be improved.

[0051] According to some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, there are two anti-torsion structures 30, which are opposite each other along the radial direction of the piston body 20; the anti-torsion guide post 37 is provided on the outer wall of the piston body 20, and the anti-torsion guide groove 38 is formed on the inner wall of the guide structure.

[0052] In this embodiment, the anti-torsion guide post 37 is disposed on the inner wall of the guide structure and extends along the axial direction of the piston body 20, and the anti-torsion guide groove 38 is formed on the support flange 22 of the piston body 20; optionally, the anti-torsion guide groove 38 is formed on the inner wall of the guide structure and extends along the axial direction of the piston body 20, and the anti-torsion guide post 37 is formed on the support flange 22 of the piston body 20.

[0053] Therefore, by having two anti-torsion structures 30 facing each other radially along the piston body 20, the piston body 20 can be subjected to uniform force, avoiding uneven wear of the piston body 20 or the guide structure, extending the service life of the piston body 20, and reducing transmission loss.

[0054] Optionally, the anti-torsion guide post 37 and the piston body 20 can be integrally molded.

[0055] According to some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, there are multiple guiding structures, including a first guiding structure 10 and a second guiding structure 11. The second guiding structure 11 is disposed within the first guiding structure 10, and a piston body 20 is disposed within the second guiding structure 11. The piston body 20 is movable relative to the second guiding structure 11 along the axial direction of the piston body 20. An anti-torsion structure 30 is disposed between the second guiding structure 11 and the piston body 20. The first guiding structure 10 is a hydraulic cylinder, and the second guiding structure 11 is a guiding sleeve. The outer wall of the second guiding structure 11 contacts and engages with the inner wall of the first guiding structure 10, limiting the circumferential rotation of the second guiding structure 11 relative to the first guiding structure 10. The inner wall of the second guiding structure 11 engages with the outer wall of the piston body 20, limiting the circumferential rotation of the piston body 20 relative to the second guiding structure 11.

[0056] The second guide structure 11 extends axially along the piston body 20 and is sleeved on the outer periphery of the piston body 20. During the assembly of the piston pump 100, the second guide structure 11 is first fixed to the inner wall of the first guide structure 10. The second guide structure 11 is embedded and fixed within the first guide structure 10. The first guide structure 10 can limit the second guide structure 11 in the axial and circumferential directions of the piston body 20. Then, the piston body 20 is movably engaged with the second guide structure 11 along the axial direction of the piston body 20 through the anti-torsion structure 30. Thus, the first guide structure 10 and the second guide structure 11 provide guidance for the piston body 20, improving transmission efficiency and assembly accuracy. The anti-torsion structure 30, located between the second guide structure 11 and the piston body 20, prevents the piston body 20 from rotating relative to the second guide structure 11 in the circumferential direction of the piston body 20, thereby improving the anti-torsion performance of the piston body 20 and the second guide structure 11.

[0057] Optionally, the second guide structure 11 is a flexible plastic part, which can absorb the vibration and impact generated during the movement of the piston body 20, extend the service life of the piston pump 100, and improve the stability of the piston body 20 during the transmission process.

[0058] Optionally, the anti-torsion structure 30 is disposed between the second guide structure 11 and the first guide structure 10. This prevents the second guide structure 11 from rotating relative to the first guide structure 10 in the circumferential direction of the piston body 20, improving the anti-torsion performance of the guide structure and thus enhancing its stability and reliability.

[0059] Optionally, the anti-torsion structure 30 is disposed between the second guide structure 11 and the piston body 20, and simultaneously, the anti-torsion structure 30 is disposed between the second guide structure 11 and the first guide structure 10. This improves the torsional resistance of the piston body 20 and the guide structure, thereby enhancing the stability and reliability of the piston pump 100.

[0060] Optionally, the anti-torsion guide post 37 includes a first anti-torsion guide post 31 and a second anti-torsion guide post 33, and the anti-torsion guide groove 38 includes a first anti-torsion guide groove 32 and a second anti-torsion guide groove 34, such as... Figure 1 and Figure 2 As shown, when the piston body 20 is only located within the first guide structure 10, for example, the first guide structure 10 is a hydraulic cylinder, the first anti-torsion guide post 31 and the first anti-torsion guide groove 32 are located between the first guide structure 10 and the piston body 20.

[0061] Optionally, such as Figure 3 As shown, when the piston body 20 is located inside the second guide structure 11 and the second guide structure 11 is not located inside the first guide structure 10, that is, when only the guide sleeve is provided and no hydraulic cylinder is provided, the second anti-torsion guide column 33 and the second anti-torsion guide groove 34 are located between the second guide structure 11 and the piston body 20.

[0062] Optionally, such as Figure 4 As shown, when the piston body 20 is located inside the second guide structure 11 and the second guide structure 11 is located inside the first guide structure 10, that is, at this time the guide sleeve is located between the hydraulic cylinder and the piston body 20, the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 are located between the second guide structure 11 and the first guide structure 10 and between the second guide structure 11 and the piston body 20.

[0063] Specifically, such as Figure 3 and Figure 4 As shown, when the second guide structure 11 is located within the first guide structure 10, one of the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 is located on the second guide structure 11; the other of the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 is located on the first guide structure 10.

[0064] For example, the second anti-torsion guide post 33 is disposed on the outer wall of the second guide structure 11, and the second anti-torsion guide post 33 extends axially along the piston body 20. One side of the second anti-torsion guide post 33 is connected to the outer wall of the second guide structure 11, and the other side of the second anti-torsion guide post 33 protrudes radially away from the center of the second guide structure 11 along the piston body 20. The second anti-torsion guide groove 34 is disposed on the inner wall of the first guide structure 10. Thus, by rationally distributing the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 onto the second guide structure 11 or the first guide structure 10, the second guide structure 11 is prevented from rotating relative to the first guide structure 10 in the circumferential direction of the piston body 20, thereby improving the anti-torsion performance of the second guide structure 11.

[0065] Optionally, such as Figure 3As shown, when the piston body 20 is located within the second guide structure 11 and the second guide structure 11 is not located within the first guide structure 10, one of the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 is located on the second guide structure 11, and the other of the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 is located on the piston body 20. For example, the second anti-torsion guide post 33 is located on the inner wall of the second guide structure 11 and extends axially along the piston body 20. One side of the second anti-torsion guide post 33 is connected to the inner wall of the second guide structure 11, and the other side of the second anti-torsion guide post 33 protrudes radially toward the center of the second guide structure 11 along the piston body 20. The second anti-torsion guide groove 34 is located on the support flange 22 of the piston body 20. Therefore, by rationally distributing the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 onto the second guide structure 11 or the piston body 20, the piston body 20 is prevented from rotating relative to the second guide structure 11 in the circumferential direction, thereby improving the anti-torsion performance of the piston body 20.

[0066] Optionally, such as Figure 4 As shown, when the piston body 20 is disposed within the second guide structure 11 and the second guide structure 11 is disposed within the first guide structure 10, one of the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 is disposed on the second guide structure 11; the other of the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 is disposed on the first guide structure 10. Simultaneously, one of the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 is disposed on the second guide structure 11, and the other of the second anti-torsion guide post 33 and the second anti-torsion guide groove 34 is disposed on the piston body 20. This improves the torsional resistance of the piston body 20 and the second guide structure 11.

[0067] Optionally, such as Figure 3 and Figure 4As shown, when the piston body 20 is disposed within the second guide structure 11 and the second guide structure 11 is disposed within the first guide structure 10, the anti-torsion guide post 37 further includes a third anti-torsion guide post 35, and the anti-torsion guide groove 38 further includes a third anti-torsion guide groove 36. One of the third anti-torsion guide post 35 and the third anti-torsion guide groove 36 is disposed on the second guide structure 11, and the other of the third anti-torsion guide post 35 and the third anti-torsion guide groove 36 is disposed on the first guide structure 10. The third anti-torsion guide post 35 and the third anti-torsion guide groove 36 are separable. In this application, the third anti-torsion guide post 35 is disposed on the outer wall of the second guide structure 11, and the third anti-torsion guide groove 36 is disposed on the inner wall of the first guide structure 10. The length of the third anti-torsion guide post 35 along the axial direction of the piston body 20 is less than the length of the second anti-torsion guide post 33 along the axial direction of the piston body 20, and the length of the third anti-torsion guide post 35 along the circumferential direction of the piston body 20 is greater than the length of the second anti-torsion guide post 33 along the circumferential direction of the piston body 20. When the second anti-torsion guide post 33 is disposed on the outer wall of the second guide structure 11, the third anti-torsion guide post 35 and the second anti-torsion guide post 33 are arranged at intervals along the circumference of the piston body 20. At least one third anti-torsion guide post 35 is provided between two adjacent second anti-torsion guide posts 33, thereby making the assembly accuracy of the second guide structure 11 and the first guide structure 10 higher and the anti-torsion effect better.

[0068] According to some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the anti-torsion structure 30 is provided at least between the second guide structure 11 and the piston body 20; the second anti-torsion guide post 33 is provided on the inner wall of the second guide structure 11; the piston body 20 includes a piston body 21 and a support flange 22, the support flange 22 is connected to one end of the piston body 21, and the second anti-torsion guide groove 34 is formed on the outer periphery of the support flange 22.

[0069] Optionally, a plurality of second anti-torsion guide posts 33 are provided on both the outer and inner walls of the second guide structure 11. The plurality of second anti-torsion guide posts 33 provided on the outer wall of the second guide structure 11 and the plurality of second anti-torsion guide posts 33 provided on the inner wall of the second guide structure 11 are radially offset along the piston body 20. The support flange 22 is provided at one end of the piston body 21 adjacent to the first guide structure 10, that is, the first guide structure 10 forms a receiving cavity, and the end of the piston body 21 with the support flange 22 is located in the receiving cavity and moves within the receiving cavity. When the second anti-torsion guide post 33 between the second guide structure 11 and the piston body 20 is provided on the inner wall of the second guide structure 11, the second anti-torsion guide groove 34 is provided on the support flange 22 and penetrates at least a portion of the adjacent edge of the support flange 22 along the circumference of the piston body 20.

[0070] Therefore, by forming a movable fit between the second anti-torsion guide groove 34 on the outer periphery of the supporting flange 22 and the second anti-torsion guide post 33 on the second guide structure 11 along the axial direction of the piston body 20, the piston body 20 can be prevented from rotating relative to the second guide structure 11 in the circumferential direction, thus improving the anti-torsion performance of the piston body 20. Simultaneously, since the contact area between the supporting flange 22 and the first guide structure 10 along the axial direction of the piston body 20 is limited, the rotation of the piston body 20 within the first guide structure 10 is restricted. This increases the anti-torsion characteristics while reducing the contact area of ​​the piston body 20 moving axially within the first guide structure 10, reducing the coefficient of friction, and improving the transmission efficiency of the piston body 20 within the first guide structure 10.

[0071] According to some embodiments of the present invention, the second guide structure 11 is detachably connected to the first guide structure 10. This facilitates the maintenance and replacement of both the second guide structure 11 and the first guide structure 10, reducing the operating cost of the piston pump 100. Optionally, replacing only the second guide structure 11 can avoid replacing the first guide structure 10, effectively reducing production and operating costs.

[0072] Optionally, the second guide structure 11 is integrated with the first guide structure 10. That is, the second guide structure 11 and the first guide structure 10 are integrally formed parts, and can be manufactured as a single unit. This avoids relative rotation between the second guide structure 11 and the first guide structure 10, improves the structural strength of the guide structure, and increases the production efficiency of the piston pump 100.

[0073] According to some embodiments of the present invention, such as Figure 1 As shown, the piston pump 100 further includes a wear-resistant ring 40, which is disposed between the guide structure and the piston body 20. The wear-resistant ring 40 is in contact with both the guide structure and the piston body 20. The wear-resistant ring 40 is located on the side of the guide structure away from the anti-torsion structure 30 along the axial direction of the piston body 20, so as to jointly support the piston body 20. The guide structure is the first guide structure 10.

[0074] Optionally, the wear ring 40 is adapted to the shape of the piston body 20. When the wear ring abuts against the piston body 20, the wear ring is fitted to the outer wall of the piston body 20, and together with the guide structure, it can form a support for the piston body 20. The wear ring 40 contacts the inner wall of the guide structure on the side adjacent to the guide structure along the radial direction of the piston body 20, and the wear ring 40 contacts the outer wall of the piston body 20 on the side adjacent to the piston body 20 along the radial direction of the piston body 20. The inner diameter of the wear ring 40 is smaller than the inner wall diameter of the guide structure cavity.

[0075] Therefore, by setting the wear-resistant ring 40, the piston body 20 can be provided with support and guidance, ensuring that at least a portion of the outer wall of the piston body 20 is coaxial with at least a portion of the inner wall of the guide structure, improving the accuracy of the piston body 20 in axial movement, avoiding the piston body 20 from deviating during movement and causing contact friction with the guide structure, extending the service life of the piston body 20 and the guide structure, making the piston body 20 move more smoothly, and improving the stability of the piston body 20 in the transmission process.

[0076] According to some embodiments of the present invention, such as Figure 1 As shown, a groove is formed on the guide structure, and a wear-resistant ring 40 is disposed in the groove; the radial inner side of the wear-resistant ring 40 is located on one side of the central axis of the piston body 20 adjacent to the corresponding groove portion of the inner wall of the guide structure. The guide structure is the first guide structure 10.

[0077] The inner wall of the guide structure has a groove that matches the shape of the wear ring 40. The wear ring 40 is disposed in the groove, which fixes and limits the wear ring 40. The cross-sectional shape of the wear-resistant part along the circumferential direction of the piston body 20 is rectangular.

[0078] Therefore, the groove facilitates the installation and positioning of the wear ring 40. The wear ring 40 is used for radial guidance and support during the reciprocating motion of the piston body 20, so that the center of the anti-torsion structure 30 of the piston body 20 is always located on the central axis of the piston body 20, preventing uneven force on the piston body 20 from causing radial separation and resulting in uneven wear between the piston body 20 and the guide structure, thus extending the service life of the piston pump 100.

[0079] According to some embodiments of the present invention, the wear-resistant ring 40 is not in complete contact with the inner wall of the groove.

[0080] That is, the radially outer surface of the wear ring 40 does not completely contact several surfaces of the inner wall of the groove. Specifically, the groove includes a side surface and a bottom surface. The bottom surface is located on the side surface radially away from the center of the piston body 20 and connects the two side surfaces. When the wear ring 40 is placed in the groove, a gap is formed between the wear ring 40 and the bottom surface. For example, when the bottom surface and the side surface are rounded, the wear ring 40 abuts against the rounded corner, and the gap is 0.3mm-0.5mm. Optionally, a gap of 0.3mm-0.5mm is formed between the wear ring 40 and one of the side surfaces. The radially inner surface of the wear ring 40 fits against the outer wall of the piston body 20, thereby ensuring that the slight deformation of the wear ring 40 during the movement of the piston body 20 can be absorbed by the gap. Optionally, the gap is 0.4mm. This can prevent the wear ring 40 from undergoing large deformation, avoid damage to the wear ring 40, extend the service life of the wear ring 40, improve the reliability of the wear ring 40, and improve the stability of the piston body 20 during transmission.

[0081] According to some embodiments of the present invention, the wear-resistant ring 40 is a discontinuous annular structure. Optionally, the wear-resistant ring 40 is formed with an opening, that is, the annular wear-resistant ring 40 is discontinuous at the opening.

[0082] This facilitates the assembly of the wear ring 40 and improves the assembly efficiency of the wear ring 40.

[0083] Optionally, the wear ring 40 is a flexible plastic part. This can improve the wear resistance of the wear ring 40 and extend its service life.

[0084] The braking system according to a second aspect of the present invention includes the piston pump 100 in the above embodiments.

[0085] A vehicle according to a third aspect of the present invention includes the piston pump 100 or braking system described in the above embodiments.

[0086] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0087] In the description of this invention, "first feature" and "second feature" may include one or more of the features. In the description of this invention, "a plurality of" means two or more. In the description of this invention, "above" or "below" the second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them. In the description of this invention, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0088] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0089] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A piston pump (100), characterized in that, include: Guiding structure; A piston body (20) is disposed within the guide structure and is movable relative to the guide structure along the axial direction of the piston body (20). An anti-torsion structure (30) is provided between the piston body (20) and the guide structure; The torsional structure (30) includes: Torsional guide post (37), the torsional guide post (37) is provided on one of the piston body (20) and the guide structure; Anti-torsion guide groove (38), the anti-torsion guide groove (38) is formed on the other of the piston body (20) and the guide structure, the anti-torsion guide post (37) is guided and fitted in the anti-torsion guide groove (38) to limit the rotation of the piston body (20) relative to the guide structure in the circumferential direction of the piston body (20); The gap between the anti-torsion guide post (37) and the anti-torsion guide groove (38) in the circumferential direction of the piston body (20) is L, wherein, The L satisfies: 0 < L ≤ R + 0.2 × (N-1), Wherein, R is the gap between the piston body (20) and the guide structure in the circumferential direction of the piston body (20), and N is the number of the anti-torsion structures (30).

2. The piston pump (100) according to claim 1, characterized in that, The anti-torsion guide post (37) extends along the axial direction of the piston body (20).

3. The piston pump (100) according to claim 1, characterized in that, The number N of the anti-torsion structure (30) satisfies: 1 < N ≤ 3, where N is a positive integer.

4. The piston pump (100) according to claim 1, characterized in that, The L satisfies: 0.1mm≤L≤0.35mm.

5. The piston pump (100) according to claim 1, characterized in that, Let the length of the anti-torsion guide post (37) or the anti-torsion guide groove (38) on the guide structure in the axial direction of the piston body (20) be X1; The piston body (20) includes a support flange (22) that contacts the guide structure, and the distance of the support flange (22) along the axial direction of the piston body (20) is X2; The length of the guide structure along the axial direction of the piston body (20) is X, and X, X1 and X2 satisfy: X1+X2≥1 / 3X.

6. The piston pump (100) according to claim 1, characterized in that, There are multiple anti-torsion structures (30), and the multiple anti-torsion structures (30) are evenly spaced along the circumference of the piston body (20).

7. The piston pump (100) according to claim 1, characterized in that, There are two anti-torsion structures (30), and the two anti-torsion structures (30) are opposite each other along the radial direction of the piston body (20); The anti-torsion guide post (37) is provided on the outer wall of the piston body (20), and the anti-torsion guide groove (38) is formed on the inner wall of the guide structure.

8. The piston pump (100) according to claim 1, characterized in that, The guide structure is multiple, including a first guide structure (10) and a second guide structure (11). The second guide structure (11) is disposed within the first guide structure (10), and the piston body (20) is disposed within the second guide structure (11). The piston body (20) is movable relative to the second guide structure (11) along the axial direction of the piston body (20). The anti-torsion structure (30) is disposed between the second guide structure (11) and the piston body (20); and / or, The anti-torsion structure (30) is disposed between the second guide structure (11) and the first guide structure (10).

9. The piston pump (100) according to claim 8, characterized in that, One of the anti-torsion guide post (37) and the anti-torsion guide groove (38) is provided on the second guide structure (11); The other of the anti-torsion guide post (37) and the anti-torsion guide groove (38) is provided on the first guide structure (10); and / or, The other of the anti-torsion guide post (37) and the anti-torsion guide groove (38) is provided on the piston body (20).

10. The piston pump (100) according to claim 9, characterized in that, The anti-torsion structure (30) is at least disposed between the second guide structure (11) and the piston body (20); The anti-torsion guide post (37) is provided on the inner wall of the second guide structure (11); The piston body (20) includes a piston body (21) and a support flange (22), the support flange (22) being connected to one end of the piston body (21), and the anti-torsion guide groove (38) being formed on the outer periphery of the support flange (22).

11. The piston pump (100) according to claim 8, characterized in that, The second guiding structure (11) is detachably connected to the first guiding structure (10); or, The second guide structure (11) is connected to the first guide structure (10) as a whole.

12. The piston pump (100) according to any one of claims 1-11, characterized in that, Also includes: Wear-resistant ring (40) is disposed between the guide structure and the piston body (20). The wear-resistant ring (40) is in contact with both the guide structure and the piston body (20). The wear-resistant ring (40) is disposed on the side of the guide structure away from the anti-torsion structure (30) along the axial direction of the piston body (20) to jointly support the piston body (20).

13. The piston pump (100) according to claim 12, characterized in that, The guide structure has a groove, and the wear-resistant ring (40) is disposed in the groove; The radial inner side of the wear-resistant ring (40) is located on one side of the central axis of the piston body (20) adjacent to the corresponding groove portion of the inner wall of the guide structure.

14. The piston pump (100) according to claim 13, characterized in that, The wear-resistant ring (40) is not in complete contact with the inner wall of the groove.

15. The piston pump (100) according to claim 12, characterized in that, The wear-resistant ring (40) has a discontinuous ring structure.

16. A braking system, characterized in that, Includes the piston pump (100) according to any one of claims 1-15.

17. A vehicle, characterized in that, Includes the piston pump (100) according to any one of claims 1-15, or the braking system according to claim 16.

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