Piston pump, vehicle brake assembly, vehicle hydraulic brake system and vehicle

Abstract

The utility model provides a piston pump, a vehicle brake assembly, a vehicle hydraulic brake system and a vehicle. The piston pump comprises a piston cylinder, a piston body, a first sealing part and a second sealing part. An oil through hole is formed in the peripheral wall of the piston cylinder and penetrates through the inner side and the outer side of the piston cylinder; the piston body can reciprocate in the piston cylinder in the axial direction of the piston cylinder. The first sealing part and the second sealing part are arranged on the inner circumferential wall of the piston cylinder in the axial direction of the piston cylinder in a spaced mode and extend by a circle in the circumferential direction of the inner circumferential wall of the piston cylinder, the first sealing part is located on the side, away from the cylinder bottom of the piston cylinder, of the oil through hole, and the second sealing part is located on the side, close to the cylinder bottom of the piston cylinder, of the oil through hole. The first sealing part, the second sealing part, the inner circumferential wall of the piston cylinder and the outer circumferential wall of the piston body define an oil storage cavity, and the oil storage cavity communicates with the oil through hole and extends at least a part of distance in the circumferential direction of the inner circumferential wall of the piston cylinder. The piston pump does not need to be additionally provided with an annular oil storage groove.

Description

Technical Field

[0001] The utility model relates to the technical field of piston pumps, in particular to a piston pump, a vehicle brake assembly, a vehicle hydraulic brake system, and a vehicle. Background Art

[0002] In the related art, a vehicle hydraulic brake system is provided with a piston pump to generate hydraulic braking force. The piston pump includes a piston cylinder and a piston body movably arranged in the piston cylinder. A sealing groove is provided on the inner wall of the piston cylinder, and a sealing ring is provided in the sealing groove to achieve a direct dynamic seal between the piston cylinder and the piston body. However, in order to achieve the purpose of oil storage, some existing piston pumps usually have an additional annular oil storage groove on the inner wall of the piston cylinder, which not only increases the difficulty of processing the piston cylinder, but also causes the structural strength of the piston cylinder to deteriorate due to the thinning of the wall thickness, resulting in the risk of the piston cylinder breaking. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a piston pump, a vehicle brake assembly, a vehicle hydraulic brake system, and a vehicle, wherein the inner peripheral wall of the piston cylinder of the piston pump is provided with a first sealing portion and a second sealing portion at intervals along the axial direction, and an annular oil storage cavity is formed between the first sealing portion, the second sealing portion, the piston cylinder, and the piston body, and no additional annular oil storage groove is required, thereby not increasing the processing difficulty of the piston cylinder, and avoiding reducing the structural strength of the piston cylinder.

[0004] In order to achieve the above objectives, in a first aspect, the utility model provides a piston pump, comprising:

[0005] A piston cylinder, wherein the peripheral wall of the piston cylinder is provided with an oil through hole, and the oil through hole passes through both the inner and outer sides of the piston cylinder;

[0006] a piston body, the piston body being reciprocable in the piston cylinder along the axial direction of the piston cylinder; and

[0007] A first sealing portion and a second sealing portion are arranged at intervals on the inner peripheral wall of the piston cylinder along the axial direction of the piston cylinder and extend along the circumferential direction of the inner peripheral wall of the piston cylinder, respectively, the first sealing portion is located on a side of the oil through hole away from the cylinder bottom of the piston cylinder, and the second sealing portion is located on a side of the oil through hole close to the cylinder bottom of the piston cylinder;

[0008] The first sealing portion, the second sealing portion, the inner circumferential wall of the piston cylinder and the outer circumferential wall of the piston body form an oil storage chamber, which is connected to the oil hole and extends at least part of the distance along the circumferential direction of the inner circumferential wall of the piston cylinder.

[0009] In one embodiment, the first sealing portion includes a first annular groove and a first sealing member, the first annular groove is formed on the inner circumferential wall of the piston cylinder, and the first sealing member is disposed in the first annular groove.

[0010] In one embodiment, the second sealing portion includes a second annular groove and a second sealing member, the second annular groove is formed on the inner circumferential wall of the piston cylinder, and the second sealing member is disposed in the second annular groove.

[0011] In one embodiment, an inner peripheral wall of the piston cylinder is provided with an annular flange portion, and the second sealing portion is provided on the inner peripheral surface of the annular flange portion.

[0012] In one embodiment, the outer peripheral wall of the piston body is provided with one or more recessed portions, and the plurality of recessed portions are spaced apart and distributed along the circumference of the piston body;

[0013] When the piston body is in the retracted position, the recessed portion cooperates with a portion of the piston cylinder where the second sealing portion is provided to form a gap.

[0014] In one embodiment, it further includes a guide ring located on a side of the first sealing portion away from the second sealing portion, the guide ring is fixedly disposed on the inner circumferential wall of the piston cylinder, and the inner circumferential wall of the guide ring is in sliding contact with the outer circumferential wall of the piston body.

[0015] In one embodiment, the piston body is provided with an accommodating cavity along the axial direction, and the piston pump further comprises a spiral transmission mechanism disposed in the accommodating cavity, wherein the spiral transmission mechanism is used to connect the driving member to convert the rotational motion of the driving member into a linear motion, thereby driving the piston body to reciprocate along the axial direction of the piston cylinder in the piston cylinder;

[0016] Wherein, a limiting mechanism is arranged between the piston cylinder and the piston body, and the limiting mechanism is used to limit the circumferential position between the piston body and the piston cylinder to be relatively fixed.

[0017] In one embodiment, the limiting mechanism includes a first limiting structure and a second limiting structure that cooperate with each other, and the first limiting structure and the second limiting structure are respectively arranged on the inner peripheral wall of the piston cylinder and the outer peripheral wall of the piston body;

[0018] Among them, one of the first limiting structure and the second limiting structure is a guide groove, and the other of the first limiting structure and the second limiting structure is a guide boss, and the guide groove extends along the axial direction of the piston cylinder and is adapted to the guide boss.

[0019] In one embodiment, the oil storage chamber is an annular oil storage chamber extending along the circumferential direction of the inner circumferential wall of the piston cylinder.

[0020] In one embodiment, when the piston body reciprocates in the piston cylinder, the first sealing portion always keeps in contact with the outer peripheral wall of the piston body;

[0021] When the piston body is in the retracted position, a gap is formed between the second sealing portion and the outer peripheral wall of the piston body;

[0022] When the piston body moves a preset distance from the retreat position toward the cylinder bottom of the piston cylinder, the second sealing portion contacts the outer peripheral wall of the piston body.

[0023] In a second aspect, the utility model provides a vehicle brake assembly, comprising:

[0024] The hydraulic block is provided with a receiving cavity;

[0025] A driving member, mounted on the hydraulic block; and

[0026] The piston pump as described in any of the above embodiments is mounted on the hydraulic block, and at least a portion of the piston pump is accommodated in the accommodation cavity;

[0027] Wherein, the driving member is used to drive the piston body to reciprocate in the piston cylinder along the axial direction of the piston cylinder.

[0028] In one embodiment, the piston body is provided with an accommodating cavity along the axial direction, the piston pump further comprises a spiral transmission mechanism disposed in the accommodating cavity, and the driving member comprises a driving motor and a reduction mechanism;

[0029] The spiral transmission mechanism is connected to the driving motor through the speed reduction mechanism to convert the rotary motion of the driving motor into linear motion, thereby driving the piston body to reciprocate in the piston cylinder along the axial direction of the piston cylinder;

[0030] Wherein, a limiting mechanism is arranged between the piston cylinder and the piston body, and the limiting mechanism is used to limit the circumferential position between the piston body and the piston cylinder to be relatively fixed.

[0031] In a third aspect, the utility model provides a vehicle hydraulic brake system, comprising a vehicle brake assembly as described in any of the above embodiments.

[0032] In a fourth aspect, the utility model provides a vehicle, comprising the vehicle hydraulic brake system as described above.

[0033] Compared with the prior art, the utility model has the following beneficial effects: in the piston pump provided in the embodiment of the utility model, a first sealing portion and a second sealing portion are axially spaced apart on the inner circumferential wall of the piston cylinder, so that the first sealing portion, the second sealing portion, the piston cylinder and the piston body are surrounded to form an annular oil storage chamber. Compared with the existing piston pump, the inner circumferential wall of the piston cylinder does not need to be additionally provided with an annular oil storage groove, thereby not increasing the processing difficulty of the piston cylinder and avoiding reducing the structural strength of the piston cylinder.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the embodiments of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of a vehicle brake assembly provided by one embodiment of the utility model.

[0037] Figure 2 yes Figure 1 Schematic diagram of the partial structure of the vehicle brake assembly shown.

[0038] Figure 3 yes Figure 2 An enlarged schematic diagram of part A is shown.

[0039] Figure 4 yes Figure 2 A cross-sectional view of the piston cylinder is shown.

[0040] Figure 5 yes Figure 2 A cross-sectional view of the piston body is shown.

[0041] Figure 6 yes Figure 2 The three-dimensional structural schematic diagram of the piston cylinder, piston body and spiral transmission structure is shown.

[0042] Figure 7 yes Figure 2 Schematic diagram of the three-dimensional structure of the reduction mechanism shown.

[0043] Figure 8 yes Figure 7 A top view of the reduction mechanism shown.

[0044] Description of main reference numerals:

[0045] 100. Vehicle brake assembly; 1. Hydraulic block; 2. Driving part; 3. Piston pump;

[0046] 21. driving motor; 22. reduction mechanism; 221. planetary gear ring; 222. sun gear; 223. planetary gear; 224. planetary gear housing; 31. piston cylinder; 311. first accommodating chamber; 312. opening; 313. first annular groove; 314. second annular groove; 315. oil through hole; 316. oil outlet hole; 317. oil storage chamber; 318. annular flange; 32. piston body; 321. second accommodating chamber; 322. step portion; 328. recessed portion; 331. first sealing member; 332. second sealing member; 34. guide ring; 35. spiral transmission mechanism; 351. screw shaft; 352. screw nut; 353. screw bearing; 354. stop pin; 36. limiting mechanism; 361. first limiting structure; 362. second limiting structure; 37. first sealing member; 38. second sealing member.

[0047] The following specific implementation manner will further illustrate the utility model in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] Please combine Figures 1 to 4 The embodiment of the utility model provides a vehicle brake assembly 100, which is used in a vehicle hydraulic brake system. The vehicle brake assembly 100 includes a hydraulic block 1, a driving member 2 and a piston pump 3. Figure 1 As shown, the hydraulic block 1 is provided with a receiving cavity, the driving member 2 is installed on one side of the hydraulic block 1, and the piston pump 3 is installed on the hydraulic block 1 and at least partially received in the receiving cavity. In the embodiment of the utility model, the hydraulic block 1 is generally a component made of metal (such as aluminum), and the hydraulic block 1 is provided with an expanded hole and a blind hole as a receiving portion for loading hydraulic devices such as a hydraulic pump, a solenoid valve, and a hydraulic accumulator, and the hydraulic devices are hydraulically connected to each other through a connecting hole. The hydraulic block 1 can adopt an existing hydraulic block component, which is not described in detail.

[0050] like Figures 1 to 4 As shown, in the embodiment of the present utility model, the piston pump 3 at least includes a piston cylinder 31 , a piston body 32 , a first sealing portion 37 and a second sealing portion 38 .

[0051] Specifically, Figure 4 As shown, the piston cylinder 31 is provided with a first accommodating chamber 311, and the first accommodating chamber 311 passes through one axial end of the piston cylinder 31, that is, the piston cylinder 31 is a cylinder body having an opening 312 at one axial end and being closed at the other axial end. The peripheral wall of the piston cylinder 31 is provided with an oil hole 315, and the oil hole 315 passes through both the inner and outer sides of the piston cylinder 31. Furthermore, the piston cylinder 31 is also provided with an oil outlet hole 316, and the oil outlet hole 316 also passes through both the inner and outer sides of the piston cylinder 31. It should be noted that the oil hole 315 and the oil outlet hole 316 are respectively connected to the corresponding hydraulic components of the hydraulic block 1, and the oil hole 315 is used to introduce hydraulic oil into the piston cylinder 31 when the piston pump 3 is depressurized, and the oil outlet hole 316 is used to pump the hydraulic oil in the piston cylinder 31 out of the piston cylinder 31 when the piston pump 3 is pressurized. The specific working process is the prior art and will not be described in detail. Figures 1 to 4 In the example of , the oil outlet hole 316 is opened on the peripheral wall of the piston cylinder 31. In other embodiments, the oil outlet hole 316 can also be opened on the bottom wall of the piston cylinder 31.

[0052] like Figure 2 As shown, the piston body 32 is at least partially received in the first accommodation chamber 311 of the piston cylinder 31 through the opening 312, and there is a gap between the outer peripheral wall of the piston body 32 and the inner peripheral wall of the piston cylinder 31, and the piston body 32 can reciprocate in the piston cylinder 31 along the axial direction of the piston cylinder 31. Specifically, as Figure 1 As shown, the driving member 2 is installed on the hydraulic block 1 near the opening 312 of the piston cylinder 31 (see Figure 4 ) on one side, the driving member 2 is connected to the piston body 32, so that it can drive the piston body 32 to reciprocate in the piston cylinder 31 along the axial direction of the piston cylinder 31.

[0053] like Figure 1 and Figure 2 As shown, the first sealing portion 37 and the second sealing portion 38 are arranged at intervals along the axial direction of the piston cylinder 31 on the inner peripheral wall of the piston cylinder 31 and extend along the circumferential direction of the inner peripheral wall of the piston cylinder 31. The first sealing portion 37 is located on the side of the oil through hole 315 away from the cylinder bottom of the piston cylinder 31, and the second sealing portion 38 is located on the side of the oil through hole 315 close to the cylinder bottom of the piston cylinder 31. Figure 1 and Figure 2 In the example, the second sealing portion 38 is located between the oil through hole 315 and the oil outlet hole 316 .

[0054] It should be emphasized that in the embodiments of the present invention, Figure 1 and Figure 2 As shown, the first sealing portion 37, the second sealing portion 38, the inner peripheral wall of the piston cylinder 31 and the outer peripheral wall of the piston body 32 can surround and form an oil storage chamber 317, and the oil storage chamber 317 is connected to the oil through hole 315, and the hydraulic oil can be stored in the oil storage chamber 317 through the oil through hole 315. In other words, in the vehicle brake assembly 100 provided by the embodiment of the utility model, the first sealing portion 37 and the second sealing portion 38 oil through holes 315 are arranged axially at intervals on the inner peripheral wall of the piston cylinder 31 of the piston pump 3, so that the first sealing portion 37, the second sealing portion 38, the piston cylinder 31 and the piston body 32 surround and form the oil storage chamber 317. Compared with the existing piston pump, the inner peripheral wall of the piston cylinder 31 does not need to be additionally provided with an annular oil storage groove, so that the processing difficulty of the piston cylinder 31 is not increased, and the structural strength of the piston cylinder 31 is avoided to be reduced.

[0055] It should also be noted that, in the embodiment of the present utility model, when the piston body 32 is at any position in the piston cylinder 31, the first sealing portion 37 always keeps in contact with the outer peripheral wall of the piston body 32, that is, the first sealing portion 37 and the piston body 32 always keep in a sealed state. Due to the sealing of the first sealing portion 37, the volume of the cavity enclosed by the first sealing portion 37, the piston body 32 and the piston cylinder 31 will change with the reciprocating motion of the piston body 32 in the piston cylinder 31, thereby affecting the oil pressure of the hydraulic oil in the cavity. For example, when the piston body 32 is in a position relative to the piston cylinder 31, the volume of the cavity enclosed by the first sealing portion 37, the volume of the cavity enclosed by the first sealing portion 37, the piston body 32 and the piston cylinder 31, and ... Figure 1 When the piston body 32 is in the retracted position shown, the volume of the cavity is the largest, and the oil pressure of the hydraulic oil in the cavity is the smallest. When the piston body 32 moves from the retracted position toward the bottom of the piston cylinder 31, the volume of the cavity gradually decreases, and the oil pressure of the hydraulic oil in the cavity gradually increases. That is, the reciprocating motion of the piston body 32 in the piston cylinder 31 along the axial direction of the piston cylinder 31 can change the volume of the cavity surrounded by the first sealing portion 37, the piston body 32 and the piston cylinder 31, and then adjust the oil pressure of the hydraulic oil in the cavity to achieve the pressure building and pressure relief functions of the piston pump 3. The specific working principle is the existing technology and will not be described in detail.

[0056] In addition, in the embodiments of the present invention, Figure 3As shown, when the piston body 32 is in the retracted position, there is a gap between the second sealing portion 38 and the outer peripheral wall of the piston body 32; when the piston body 32 moves a preset distance from the retracted position toward the cylinder bottom of the piston cylinder 31, the second sealing portion 38 can contact the outer peripheral wall of the piston body 32, and a seal is formed between the second sealing portion 38 and the piston body 32. At this time, the first sealing portion 37, the second sealing portion 38, the inner peripheral wall of the piston cylinder 31 and the outer peripheral wall of the piston body 32 are surrounded to form an oil storage cavity 317 connected to the oil through hole 315. The preset distance can be set according to actual needs and the actual stroke of the piston body 32, and is not limited to this.

[0057] Preferably, Figure 1 and Figure 2 In the example, the oil storage chamber 317 is an annular oil storage chamber extending along the circumferential direction of the inner circumferential wall of the piston cylinder 31. The volume of the oil storage chamber is large, which is conducive to storing more hydraulic oil. Of course, in other embodiments, the oil storage chamber 317 can also be an oil storage chamber of other shapes. For example, by providing a sealing block between the first sealing portion 37 and the second sealing portion 38 located on the same side of the piston body 32, the oil storage chamber 317 becomes a semi-annular oil storage chamber.

[0058] Alternatively, if Figure 1 and Figure 2 As shown, in one embodiment of the present utility model, the first sealing portion 37 includes a first annular groove 313 and a first sealing member 331, the first annular groove 313 is formed on the inner peripheral wall of the piston cylinder 31, and the first sealing member 331 is disposed in the first annular groove 313; the second sealing portion 38 includes a second annular groove 314 and a second sealing member 332, the second annular groove 314 is formed on the inner peripheral wall of the piston cylinder 31, and the second sealing member 332 is disposed in the second annular groove 314. The cross-sectional shapes of the first annular groove 313 and the second annular groove 314 perpendicular to the circumference of the piston cylinder 31 may be, but not limited to, rectangular or arc-shaped, and the first sealing member 331 and the second sealing member 332 may be, but not limited to, elastic sealing rings.

[0059] Of course, in other embodiments, the first sealing portion 37 and the second sealing portion 38 may also adopt other sealing structures, such as but not limited to directly bonding a sealing ring on the inner circumferential wall of the piston cylinder 31 to form a sealing portion, so that the piston cylinder 31 does not need to have an annular groove on the inner circumferential wall, thereby simplifying the structure and processing difficulty.

[0060] Please combine Figure 1 and Figure 2In one embodiment of the utility model, the piston pump 3 further comprises a guide ring 34 located on the side of the first sealing portion 37 away from the second sealing portion 38, the guide ring 34 is fixedly arranged on the inner peripheral wall of the piston cylinder 31, and the inner peripheral wall of the guide ring 34 is in sliding contact with the outer peripheral wall of the piston body 32. The guide ring 34 is not limited to being fixedly connected to the inner peripheral wall of the piston cylinder 31 by riveting. In this embodiment, by arranging the guide ring 34 in sliding contact with the piston body 32 in the piston cylinder 31, when the piston body 32 makes axial reciprocating motion in the piston cylinder 31, the guide ring 34 can guide the movement of the piston body 32, which is beneficial to ensure the coaxiality of the piston body 32 and the piston cylinder 31.

[0061] Please combine again Figures 2 to 4 In one embodiment of the present utility model, the inner circumferential wall of the piston cylinder 31 is provided with an annular flange portion 318, and the second sealing portion 38 is provided on the inner circumferential surface of the annular flange portion 318. Specifically, the second annular groove 314 is provided on the inner circumferential surface of the annular flange portion 318, and the second sealing member 332 is provided in the second annular groove 314. In this embodiment, by providing the annular flange portion 318 on the inner circumferential wall of the piston cylinder 31 and providing the second sealing portion 38 on the inner circumferential surface of the annular flange portion 318, the first sealing portion 37 and the second sealing portion 38 are located on different circumferential surfaces of the piston cylinder 31, that is, the first annular groove 313 and the second annular groove 314 are provided on different circumferential surfaces of the piston cylinder 31, which can reduce the influence on the structural strength of the piston cylinder 31.

[0062] Of course, in other embodiments, the inner wall of the piston cylinder 31 may not be provided with the annular flange portion 318, and the first annular groove 313 and the second annular groove 314 are opened on the same circumferential surface of the piston cylinder 31, as long as it does not affect the normal use of the piston cylinder 31.

[0063] Please combine Figure 3 , Figure 5 and Figure 6 In one embodiment of the present invention, the outer peripheral wall of the piston body 32 is provided with at least one recessed portion 328. When the piston body 32 is in the retracted position, each of the recessed portions 328 and the portion of the piston cylinder 31 provided with the second sealing portion 38 (see Figure 3 The annular flange portion 318 in the piston body 32 cooperates to form a gap, and the hydraulic oil flows into the cavity between the bottom wall of the piston body 32 and the bottom wall of the piston cylinder 31 through the oil hole 315, the oil storage cavity 317 and the gap that are connected in sequence. Figure 5 and Figure 6In the example, the outer peripheral wall of the piston body 32 is provided with a plurality of recessed portions 328 spaced apart along the circumferential direction, and each of the recessed portions 328 may be, but not limited to, a 1 / 4 spherical groove or an arc groove. The provision of a plurality of recessed portions 328 is conducive to increasing the speed at which the hydraulic oil flows into the cavity. Of course, in other embodiments, the outer peripheral wall of the piston body 32 may also be provided with an annular recessed portion 328, and the cross-sectional shape of the recessed portion 328 perpendicular to the circumferential direction of the piston body 32 may be, but not limited to, a rectangle or an arc.

[0064] Please combine Figure 1 , Figure 2 , Figure 5 and Figure 6 In one embodiment of the present utility model, the piston body 32 is provided with a second accommodating chamber 321 along the axial direction, and the piston pump 3 further includes a screw transmission mechanism 35 disposed in the second accommodating chamber 321, and the screw transmission mechanism 35 is used to connect the aforementioned driving member 2 (see Figure 1 ) to convert the rotational motion of the driving member 2 into linear motion, thereby driving the piston body 32 to reciprocate axially in the piston cylinder 31 along the piston cylinder 31. Specifically, in the present embodiment, the spiral transmission mechanism 35 includes a screw shaft 351, a screw nut 352, and a screw bearing 353, and the driving member 2 includes a driving motor 21, wherein the screw nut 352 is accommodated in the second accommodating chamber 321 and is fixedly connected to the piston body 32, the screw shaft 351 is fitted with the screw nut 352 through a ball, the screw bearing 353 is fixedly sleeved on the end of the screw shaft 351 exposed to the piston body 32, and the end of the screw shaft 351 exposed to the piston body 32 is connected to the output shaft of the driving motor 21, so that the spiral transmission mechanism 35 can convert the rotational motion of the driving motor 21 into linear motion, thereby driving the piston body 32 to reciprocate axially in the piston cylinder 31. In the present embodiment, as Figure 2 and Figure 5 As shown, the inner circumferential wall of the piston body 32 is provided with a step portion 322, and the screw nut 352 is provided with a corresponding shoulder. When the screw nut 352 is installed in the piston body 32, the shoulder stops at the step portion 322, which facilitates the installation and positioning of the screw nut 352.

[0065] like Figures 4 to 6 As shown, in one embodiment of the present utility model, a limiting mechanism 36 is provided between the piston cylinder 31 and the piston body 32, and the limiting mechanism 36 is used to limit the circumferential position between the piston body 32 and the piston cylinder 31 to be relatively fixed, so as to prevent the piston body 32 from rotating relative to the piston cylinder 31 when making axial reciprocating motion in the piston cylinder 31.

[0066] exist Figures 4 to 6 In the example, the limiting mechanism 36 includes a first limiting structure 361 and a second limiting structure 362 that cooperate with each other, and the first limiting structure 361 and the second limiting structure 362 are respectively arranged on the inner circumferential wall of the piston cylinder 31 and the outer circumferential wall of the piston body 32. Optionally, one of the first limiting structure 361 and the second limiting structure 362 is a guide groove, and the other of the first limiting structure 361 and the second limiting structure 362 is a guide boss, and the guide groove extends along the axial direction of the piston cylinder 31 and is matched with the guide boss. Specifically, in the present embodiment, the first limiting structure 361 is a guide groove that is opened on the inner circumferential wall of the piston cylinder 31 and extends along the axial direction of the piston cylinder 31, and the second limiting structure 362 is a guide boss that is convexly arranged on the outer circumferential wall of the piston body 32 and is matched with the guide groove. Preferably, in Figures 4 to 6 In the example, the first limiting structure 361 and the second limiting structure 362 are both provided in plurality and are spaced apart along the circumference of the piston cylinder 31, which is beneficial to improving the reliability of preventing the piston body 32 from rotating relative to the piston cylinder 31. The guide boss and the piston body 32 may be integrally formed or may be separately formed and then fixedly connected together, preferably integrally formed to reduce processing difficulty and manufacturing cost.

[0067] In other embodiments, the limiting mechanism 36 may also be a combination of a limiting block and a limiting hole, which is not limited thereto.

[0068] Further, such as Figure 2 As shown, in one embodiment of the present utility model, the driving member 2 preferably further includes a speed reduction mechanism 22 connected between the driving motor 21 and the screw transmission mechanism 35, and the speed reduction mechanism 22 is used to reduce the output speed of the driving motor 21, thereby increasing the torque of the screw shaft 351. Figure 2 , Figure 7 and Figure 8In this embodiment, the reduction mechanism 22 can adopt a planetary gear structure, and the reduction mechanism 22 specifically includes a planetary gear housing 224 for fixedly connecting the outer ring of the screw bearing 353, a planetary gear ring 221 fixedly arranged inside the planetary gear housing 224, a sun gear 222 arranged in the planetary gear ring 221, and a plurality of planetary gears 223, wherein the sun gear 222 is located in the middle area of ​​the planetary gear ring 221, and the plurality of planetary gears 223 are distributed at intervals on the periphery of the sun gear 222 and are respectively meshed with the sun gear 222. The spiral transmission mechanism 35 also includes a plurality of limit pins 354 arranged on the inner ring of the lead screw bearing 353, and the plurality of limit pins 354 are plugged into the shaft holes of the plurality of planetary gears 223 one by one, and the output shaft of the drive motor 21 is plugged into the shaft hole of the sun gear 222, so that the rotation of the drive motor 21 drives the sun gear 222 to rotate, and the sun gear 222 drives the plurality of planetary gears 223 to rotate, and then drives the inner ring of the lead screw bearing 353 and the lead screw shaft 351 to rotate, so as to achieve the above-mentioned deceleration and torque increase effect. It can be understood that the deceleration ratio of the deceleration mechanism 22 can be adjusted by reasonably setting the gear ratio of the sun gear 222 and the planetary gear 223, which will not be described in detail.

[0069] It can be understood that in the embodiments of the present invention, the piston pump 3 can also adopt other structures, for example, but not limited to the driving member 2 adopting a hollow rotor, the spiral transmission mechanism 35 is installed in the hollow rotor, and the rotational motion of the driving member 2 can also be converted into linear motion by the spiral transmission mechanism 35, thereby driving the piston body 32 to perform axial reciprocating motion in the piston cylinder 31, which will not be elaborated.

[0070] Furthermore, an embodiment of the utility model also provides a vehicle hydraulic brake system, including the vehicle brake assembly 100 described in any of the above embodiments, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated on.

[0071] Furthermore, an embodiment of the utility model further provides a vehicle, including a vehicle hydraulic brake system, wherein the vehicle hydraulic brake system includes the vehicle brake assembly 100 described in any of the above embodiments, and thus at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail. The vehicle may be any existing vehicle equipped with a vehicle hydraulic brake system, which is not limited thereto.

[0072] In the description of the present invention, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A piston pump, characterized in that: include: A piston cylinder, wherein the peripheral wall of the piston cylinder is provided with an oil through hole, and the oil through hole passes through both the inner and outer sides of the piston cylinder; a piston body, the piston body being reciprocable in the piston cylinder along the axial direction of the piston cylinder; and A first sealing portion and a second sealing portion are arranged at intervals on the inner peripheral wall of the piston cylinder along the axial direction of the piston cylinder and extend along the circumferential direction of the inner peripheral wall of the piston cylinder, respectively, the first sealing portion is located on a side of the oil through hole away from the cylinder bottom of the piston cylinder, and the second sealing portion is located on a side of the oil through hole close to the cylinder bottom of the piston cylinder; The first sealing portion, the second sealing portion, the inner circumferential wall of the piston cylinder and the outer circumferential wall of the piston body form an oil storage chamber, which is connected to the oil hole and extends at least part of the distance along the circumferential direction of the inner circumferential wall of the piston cylinder.

2. The piston pump according to claim 1, characterized in that The first sealing portion includes a first annular groove and a first sealing member. The first annular groove is formed on the inner peripheral wall of the piston cylinder, and the first sealing member is disposed in the first annular groove.

3. The piston pump according to claim 1 or 2, characterized in that The second sealing portion includes a second annular groove and a second sealing member. The second annular groove is formed on the inner peripheral wall of the piston cylinder. The second sealing member is disposed in the second annular groove.

4. The piston pump according to claim 1, characterized in that An annular flange portion is provided on the inner peripheral wall of the piston cylinder, and the second sealing portion is provided on the inner peripheral surface of the annular flange portion.

5. The piston pump according to claim 1 or 4, characterized in that The outer peripheral wall of the piston body is provided with one or more recessed parts, and the plurality of recessed parts are distributed at intervals along the circumference of the piston body; When the piston body is in the retracted position, the recessed portion cooperates with a portion of the piston cylinder where the second sealing portion is provided to form a gap.

6. The piston pump according to claim 1, characterized in that It also includes a guide ring located on a side of the first sealing portion away from the second sealing portion, the guide ring is fixedly arranged on the inner peripheral wall of the piston cylinder, and the inner peripheral wall of the guide ring is in sliding contact with the outer peripheral wall of the piston body.

7. The piston pump according to claim 1, characterized in that The piston body is provided with an accommodating cavity along the axial direction, and the piston pump further comprises a spiral transmission mechanism disposed in the accommodating cavity, wherein the spiral transmission mechanism is used to connect the driving member to convert the rotary motion of the driving member into linear motion, thereby driving the piston body to reciprocate along the axial direction of the piston cylinder in the piston cylinder; Wherein, a limiting mechanism is arranged between the piston cylinder and the piston body, and the limiting mechanism is used to limit the circumferential position between the piston body and the piston cylinder to be relatively fixed.

8. The piston pump according to claim 7, characterized in that The limiting mechanism comprises a first limiting structure and a second limiting structure that cooperate with each other, wherein the first limiting structure and the second limiting structure are respectively arranged on the inner peripheral wall of the piston cylinder and the outer peripheral wall of the piston body; Among them, one of the first limiting structure and the second limiting structure is a guide groove, and the other of the first limiting structure and the second limiting structure is a guide boss, and the guide groove extends along the axial direction of the piston cylinder and is adapted to the guide boss.

9. The piston pump according to claim 1, characterized in that The oil storage chamber is an annular oil storage chamber extending along the circumferential direction of the inner peripheral wall of the piston cylinder.

10. The piston pump according to claim 1, characterized in that When the piston body reciprocates in the piston cylinder, the first sealing portion always keeps in contact with the outer peripheral wall of the piston body; When the piston body is in the retracted position, a gap is formed between the second sealing portion and the outer peripheral wall of the piston body; When the piston body moves a preset distance from the retreat position toward the cylinder bottom of the piston cylinder, the second sealing portion contacts the outer peripheral wall of the piston body.

11. A vehicle brake assembly, characterized in that: include: The hydraulic block is provided with a receiving cavity; A driving member, mounted on the hydraulic block; as well as The piston pump according to any one of claims 1 to 10, mounted on the hydraulic block, and at least part of the piston pump is accommodated in the accommodation cavity; Wherein, the driving member is used to drive the piston body to reciprocate in the piston cylinder along the axial direction of the piston cylinder.

12. The vehicle brake assembly according to claim 11, characterized in that: The piston body is provided with an accommodating cavity along the axial direction, the piston pump further comprises a spiral transmission mechanism arranged in the accommodating cavity, and the driving member comprises a driving motor and a reduction mechanism; The spiral transmission mechanism is connected to the driving motor through the speed reduction mechanism to convert the rotary motion of the driving motor into linear motion, thereby driving the piston body to reciprocate in the piston cylinder along the axial direction of the piston cylinder; Wherein, a limiting mechanism is arranged between the piston cylinder and the piston body, and the limiting mechanism is used to limit the circumferential position between the piston body and the piston cylinder to be relatively fixed.

13. A vehicle hydraulic brake system, characterized in that: Comprising a vehicle brake assembly as claimed in claim 11 or 12.

14. A vehicle, characterized in that: Comprising the vehicle hydraulic brake system as claimed in claim 13.

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