Hydraulic braking device

Abstract

The invention relates to the field of braking systems, in particular to a hydraulic braking device which comprises a cylinder body. A motor driving shaft and a piston are arranged in the cylinder body; a driving shaft of the motor is connected with the piston through a linkage mechanism; the linkage mechanism comprises a linkage push rod connected to the motor driving shaft and an insertion sinking groove formed in the piston; a driving shaft of the motor is connected with an inserting sinking groove in the piston through a linkage push rod; the linkage push rod can move in the insertion sinking groove; through the arrangement of the linkage mechanism, the traditional connection mode between the motor driving shaft and the piston is changed, the linkage push rod is fixedly connected with the motor driving shaft and is equivalently movably connected with the piston, and in actual use, even if the motor driving shaft and the piston have a relative eccentric error, the linkage push rod can be moved to the piston, so that the motor driving shaft can be driven to rotate. When the motor driving shaft drives the piston to move, the piston and the motor driving shaft have the automatic deviation compensation capacity, and the eccentric wear phenomenon of the piston to the cylinder body is reduced or avoided.

Description

Technical Field

[0001] The invention relates to the field of brake systems, in particular to a hydraulic brake device. Background Art

[0002] The currently known vehicle brake-by-wire device generally comprises: a motor and a transmission mechanism, a cylinder body, a master cylinder piston, and a rubber seal, wherein the drive shaft of the motor and the transmission mechanism is directly connected to the piston by mechanical connection.

[0003] The basic working process is as follows: the motor and transmission mechanism convert rotational motion into linear motion, the motor drive shaft drives the piston to move linearly in the cylinder hole, generates hydraulic pressure, and transmits the braking pressure to the vehicle's brake wheel cylinder through the oil circuit.

[0004] In actual use, it is required to limit the connection method between the motor drive shaft and the piston to ensure that the two can perform linear motion durably and reliably.

[0005] The prior art directly connects the motor drive shaft to the piston, the two are completely coaxially distributed, and are fixedly connected by a mechanical structure.

[0006] Although the traditional design can realize the operation of the motor drive shaft driving the piston, it has the following problems:

[0007] The motor drive shaft and the master cylinder piston are mechanically connected in the same direction of movement. Regardless of whether it is due to processing or assembly reasons, there is inevitably a certain eccentricity error between the motor drive shaft and the piston.

[0008] There is inevitably an eccentricity error between the cylinder hole of the cylinder body and the bearing seat hole of the motor drive shaft.

[0009] Therefore, in actual use, eccentric wear of the cylinder bore is likely to occur; because the motor drive shaft will generate a radial component force, which will cause eccentric wear on the cylinder body during the movement of the piston, thereby reducing the service life of the cylinder body and even the braking device.

[0010] Therefore, in order to improve the above problems, it is necessary to optimize the design of the existing braking device. Summary of the invention

[0011] The object of the present invention is to provide a novel hydraulic brake device which can avoid or reduce the eccentric wear of a cylinder body caused by the eccentricity between a motor drive shaft and a master cylinder piston.

[0012] In order to achieve the above object, the technical solution adopted by the present invention is:

[0013] A hydraulic brake device comprises a cylinder body; a motor drive shaft and a piston are arranged in the cylinder body; the motor drive shaft is connected to the piston through a linkage mechanism;

[0014] The linkage mechanism comprises a linkage push rod connected to the motor drive shaft and a plug-in sink groove arranged on the piston;

[0015] The motor drive shaft is connected to the plug-in sink groove on the piston through a linkage push rod;

[0016] The linkage push rod can move in the insertion sink.

[0017] The linkage mechanism also includes a support plunger arranged in the plug-in sink; the linkage push rod and the support plunger are arranged to press against each other; the linkage push rod is connected to the piston through the support plunger.

[0018] The support plunger is provided with a positioning groove, which is a spherical groove or a conical groove.

[0019] The linkage push rod comprises a base rod, and a connecting ball head is arranged at the end of the base rod; the maximum outer diameter of the connecting ball head is greater than the outer diameter of the base rod.

[0020] The linkage mechanism also includes a pre-tightening mechanism, which includes an elastic member arranged in the plug-in sink groove; one end of the elastic member is connected to the linkage push rod, and the other end is connected to the piston.

[0021] A support seat is arranged in the plug-in sink.

[0022] The support seat is provided with a through hole, and the linkage push rod passes through the support seat and is inserted into the insertion groove of the piston.

[0023] The plug-in groove is arranged through the piston; a support seat is arranged at one end of the plug-in groove away from the motor drive shaft; and the through-hole is clearance-matched with the linkage push rod.

[0024] The plug-in groove includes a first groove and a second groove, the inner diameter of the second groove is larger than the inner diameter of the first groove; the first groove is connected to the second groove, and the first groove is arranged close to the drive motor shaft.

[0025] The supporting plunger and the connecting ball head are both clearance-matched with the inner walls of the adjacent plug-in sinks.

[0026] The advantages of the present invention are:

[0027] The invention discloses a hydraulic braking device.

[0028] The present invention changes the traditional connection mode between the motor drive shaft and the piston by setting a linkage mechanism. The linkage push rod of the present invention is fixedly connected to the motor drive shaft, and is flexibly connected to the piston. In actual use, even if the motor drive shaft and the piston have a relative eccentric error, when the motor drive shaft drives the piston to move, the piston and the motor drive shaft have automatic deviation compensation capability, thereby reducing or avoiding the eccentric wear of the piston on the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0030] Figure 1 FIG. 1 is a schematic structural diagram of a first embodiment of the present invention.

[0031] Figure 2 It is a structural schematic diagram of the second embodiment of the present invention.

[0032] Figure 3 It is a schematic diagram of the structure when the present invention is connected with a motor during actual use.

[0033] The marks in the above figure are:

[0034] 1-1, motor, 2-1, transmission mechanism, 1, motor drive shaft, 2, piston, 21, plug-in groove, 211, first groove, 213, second groove, 3, cylinder body, 31, pressure chamber, 4, linkage push rod, 41, first connecting rod, 42, second connecting rod, 43, connecting ball head, 5, support plunger, 51, positioning groove, 6, support seat, 61, through hole, 7, sealing member, 8, elastic member. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0036] A hydraulic brake device comprises a cylinder body 3; a motor drive shaft 1 and a piston 2 are arranged in the cylinder body 3; the motor drive shaft 1 is connected to the piston 2 through a linkage mechanism; the present invention changes the traditional connection mode between the motor drive shaft 1 and the piston 2 by setting the linkage mechanism, the linkage push rod 4 of the present invention is fixedly connected to the motor drive shaft 1, and is connected to the piston 2 in a manner equivalent to a movable connection, based on such a setting, in actual use, even if the motor drive shaft 1 and the piston 2 have a relative eccentricity error, when the motor drive shaft 1 drives the piston 2 to move, the linkage push rod 4 and the piston 2 have a certain offset, and then the piston 2 and the motor drive shaft 1 have the ability of automatic deviation compensation, thereby reducing or avoiding the eccentric wear of the piston 2 on the cylinder body 3.

[0037] Specifically, the linkage mechanism disclosed in the present invention mainly functions to change the connection mode between the motor drive shaft 1 and the piston 2. In the present invention, the linkage mechanism includes a linkage push rod 4 connected to the motor drive shaft 1 and a plug-in groove 21 arranged on the piston 2; the motor drive shaft 1 is connected to the plug-in groove 21 on the piston 2 through the linkage push rod 4; during the actual connection, one end of the linkage push rod 4 is connected to the motor drive shaft 1, and the other end is plugged into the plug-in groove 21. During actual use, the linkage push rod 4 is fixedly connected to the motor drive shaft 1, and the linkage push rod 4 is plugged into the plug-in groove 21, and the linkage push rod 4 is required to be able to move in the plug-in groove 21; in order to prevent the linkage push rod 4 from detaching from the plug-in groove 21, the following structure, such as the support seat 6, can be used for restraint and fixation, or the plug-in groove 21 can be optimized by optimizing its own structure to achieve mutual restraint.

[0038] For example, the linkage push rod 4 can be made into a spherical push rod, and the plug-in groove 21 can be designed as a groove structure with a large inner cavity and a small opening. When the linkage push rod 4 is set to a spherical push rod, the linkage push rod 4 is also formed as a structure with one end large and the other end small. During subsequent use, the larger end of the linkage push rod 4 is plugged into the plug-in groove 21, and the relative clamping and limiting between the spherical push rod and the plug-in groove 21 can prevent the linkage push rod 4 from being separated from the plug-in groove 21; at the same time, by limiting the inner cavity size of the plug-in groove 21, the linkage push rod 4 can be moved in the plug-in groove 21, thereby avoiding a rigid connection between the linkage push rod 4 and the piston 2; that is, the two have a certain offset; it is convenient to realize that when the motor drive shaft 1 drives the piston 2 to move, the piston 2 and the motor drive shaft 1 have the ability to automatically compensate for deviations, thereby reducing or avoiding the eccentric wear of the piston 2 on the cylinder body 3.

[0039] Furthermore, the linkage mechanism in the present invention also includes a support plunger 5 arranged in the plug-in groove 21; the support plunger 5 plays a good supporting and pressing role, which is convenient for cooperating with the linkage push rod 4, so that the linkage push rod 4 can control the position of the piston 2 in subsequent use.

[0040] In addition, in the present invention, the linkage push rod 4 and the support plunger 5 are arranged to press against each other; the linkage push rod 4 is connected to the piston 2 through the support plunger 5; in subsequent use, the linkage push rod 4 is pressed against the support plunger 5, and the support plunger 5 fits in the plug-in groove 21; so that in subsequent use, the motor drive shaft 1 drives the linkage push rod 4 to move, and the linkage push rod 4 drives the piston 2 to move, thereby realizing the control of the movement of the piston 2 by the motor drive shaft 1.

[0041] Furthermore, in the present invention, a positioning groove 51 is provided on the support plunger, and the positioning groove 51 is a spherical groove or a conical groove. Through the setting of the positioning groove 51, the present invention provides a sink structure on the support plunger 5, and such a setting facilitates the mutual clamping and limiting between the linkage push rod 4 and the support plunger 5 during subsequent use. At the same time, the setting of the positioning groove 51 better ensures the stability of the linkage between the linkage push rod 4 and the support plunger 5.

[0042] In addition, it should be noted that although the present invention is limited to the positioning groove 51 structure in the above statement, the positioning groove 51 here can generally be set as a spherical groove or a conical groove, mainly for use with the connecting ball head on the linkage push rod 4, but it does not mean that rectangular grooves, arc grooves and other groove structures cannot be used on the support plunger 5; in other words, in conventional design, rectangular grooves, arc grooves and other groove structures can also be used to replace the above-mentioned positioning groove 51; they mainly play a limiting role.

[0043] Furthermore, in the present invention, the linkage push rod 4 includes a base rod, and a connecting ball head 43 is provided at the end of the base rod; the base rod plays a basic connection role, which facilitates the connection arrangement of the linkage push rod 4 on the motor drive shaft 1, and at the same time facilitates extension to the plug-in groove 21 of the piston 2, so as to facilitate the subsequent linkage effect.

[0044] In addition, in the present invention, the connecting ball head 43 also plays a good pressing and fitting role, because the outer side surface of the connecting ball head 43 is an arc-shaped surface structure, and in subsequent use, it can cooperate with the positioning groove 51 on the support plunger 5, thereby greatly ensuring the contact area between the linkage push rod 4 and the support plunger 5; ensuring the linkage of the movement of the support plunger 5 and the linkage push rod 4.

[0045] Similarly, the connecting ball head here can also be replaced by a structure such as a rectangular block or a round ball. The present invention uses a connecting ball head structure mainly to cooperate with the above-mentioned positioning groove 51 to further optimize the use effect of the present invention, but it does not mean that block structures of other structures cannot be used in practice.

[0046] In addition, in the present invention, the maximum outer diameter of the connecting ball head 43 is greater than the outer diameter of the base rod; based on such a setting, a step is formed at the connection between the connecting ball head 43 and the base rod. Such a setting is convenient for limiting the position of the elastic member 8 during subsequent use, and avoids the need to add a connection method between the elastic member 8 and the linkage push rod 4 when the elastic member 8 is actually arranged.

[0047] Furthermore, the linkage mechanism described in the present invention also includes a pre-tightening mechanism, and the provision of the pre-tightening mechanism is mainly to ensure the tightness of the fit between the linkage push rod 4 and the support plunger 5, and to ensure the stability of the connection between the linkage push rod 4 and the support plunger 5.

[0048] Specifically, the linkage mechanism in the present invention also includes a pre-tensioning mechanism, which includes an elastic member 8 arranged in the plug-in groove 21; one end of the elastic member 8 is connected to the linkage push rod 4, and the other end is connected to the piston 2; here the early warning mechanism mainly includes an elastic member 8, and the elastic member 8 is used to provide a lateral driving force to the linkage push rod 4, so that the linkage push rod 4 can be pressed against the support plunger 5; to facilitate the subsequent pushing operation of the motor drive shaft 1 on the piston 2.

[0049] In actual design, because the structure of the piston 2 is diverse, different piston 2 structures require different connection methods of the elastic member 8; but the essential requirement is that one end of the elastic member 8 is connected to the linkage push rod 4, and the other end is connected to the piston 2. How the elastic member 8 is connected to the piston 2 is selected according to needs. It can be directly pressed against the support seat 6 below, or it can be pressed against the step formed by the first groove 211 and the second groove 212. Of course, it can also be bridged by other structures; the main purpose is to enable the elastic member 8 to provide a lateral driving force to the linkage push rod 4, so that it has a tendency to maintain pressure on the support plunger 5 for a long time.

[0050] Specifically, with Figure 1 As shown, the pre-tightening mechanism in the present invention includes an elastic member 8 arranged in the plug-in groove 21 and a support seat 6 connected to the plug-in groove 21; in actual arrangement, the support seat 6 is arranged at the end of the plug-in groove 21, and the connection between the support seat 6 and the plug-in groove 21 can be connected in an interference fit manner, or can be snap-connected, or can be screwed, etc.

[0051] In the present invention, the setting of the elastic member 8 mainly plays a good supporting role, which facilitates the pushing of the linkage push rod 4 so that the linkage push rod 4 fits on the supporting plunger 5; it is convenient for the linkage push rod 4 to control the sensitivity of the piston 2 movement during subsequent use.

[0052] At the same time, in the present invention, one end of the elastic member 8 is connected to the linkage push rod 4, and the other end is connected to the support seat 6; based on such a setting, under the joint action of the support seat 6 and the elastic member 8, the elastic member 8 pushes the linkage push rod 4 to make it fit with the support plunger 5, which not only ensures the stability of the position of the support plunger 5 in the plug-in groove 21, but also facilitates the motor drive shaft 1 to push and pull the piston 2; in the normal state, the elastic member 8 plays a pre-tightening role to ensure the tightness of the linkage push rod 4 and the support plunger 5.

[0053] When the motor drive shaft 1 pulls the piston 2 to operate, the elastic member 8 plays a good supporting and buffering role, and can also interact with the linkage push rod 4 to realize the pulling operation of the motor drive shaft 1 on the piston 2.

[0054] In addition, a through hole 61 is provided on the support seat 6 in the present invention. The setting of the through hole 61 facilitates the through arrangement of the linkage push rod 4 on the support seat 6. In actual use, the linkage push rod 4 in the present invention passes through the support seat 6 and is inserted into the insertion groove 21 of the piston 2. Such an operation method facilitates the insertion of the linkage push rod 4 into the piston 2. When the support seat 6 realizes the position limitation of the motor drive shaft 1, it can also facilitate the subsequent control of the motor drive shaft 1 over the movement of the piston 2.

[0055] In addition, in the present invention, the through hole 61 is a frustum hole; such a configuration can reduce the motion interference between the linkage push rod 4 and the support seat 6 when the linkage push rod 4 is pulled back.

[0056] Attach Figure 2 As shown; in actual arrangement, the inner diameters of the first groove 211 and the second groove 212 are different, so that a step is formed at the connection between the first groove 211 and the second groove 212. The step can be used to support and limit the elastic member 8 on one side close to the motor drive shaft 1, and the other side is in contact with the inner side of the connecting ball head, thereby realizing the supporting effect of the elastic member 8 of the present invention on the linkage push rod 4.

[0057] Furthermore, in the present invention, a support seat 6 is provided in the plug-in sink 21; the support seat 6 has different functions due to different setting positions in the present invention.

[0058] At the same time, in actual use, whether the support seat 6 is provided is also selected according to the structure of the plug-in sink 21.

[0059] When the plug-in recess 21 is designed as a stepped groove structure and the plug-in recess 21 does not penetrate the piston 2 , the support seat 6 may not be arranged in the plug-in recess 21 .

[0060] When the plug-in groove 21 passes through the piston 2; if the plug-in groove 21 is not a stepped groove; support seats 6 must be set at both ends of the plug-in groove 21, and the support seat 6 close to the side of the motor drive shaft 1 is required to have a through hole 61, and the support seat 6 away from the side of the motor drive shaft 1 is not provided with a through hole 61; because the support seat 6 close to the side of the motor drive shaft 1 is provided with a through hole 61, it mainly plays a avoidance role, and can also limit the end of the elastic member 8, while the support seat 6 away from the side of the motor drive shaft 1 is not provided with a through hole 61, which mainly plays a blocking role, used to close the piston 2 and ensure the integrity of the piston 2. At the same time, the support seat 6 and the piston 2 can be designed as a detachable structure. Such a setting facilitates the assembly of the linkage push rod 4 in the piston 2; at the same time, this is that the support seat 6 can also laterally limit the support plunger 5; it is convenient for the motor drive shaft 1 to push the support plunger 5, and finally realize the operation of the piston 2.

[0061] When the plug-in groove 21 passes through the piston 2, if the plug-in groove 21 is a stepped groove structure (for details, please refer to the plug-in groove 21 structure below); it is only necessary to set a support seat 6 on the side of the plug-in groove 21 away from the motor drive shaft 1, and no through hole 61 is set on the support seat 6, and the support seat 6 and the piston 2 can be connected by a detachable connection method, which can be a threaded connection, an interference fit, etc.

[0062] When the plug-in groove 21 is a cylindrical groove structure and the plug-in groove 21 does not penetrate the piston 2; it is only necessary to set a support seat 6 on the side of the plug-in groove 21 close to the motor drive shaft 1. The support seat 6 here mainly plays a role in limiting the end of the elastic member 8; please refer to the above statement for details.

[0063] Furthermore, in the present invention, a through hole 61 is provided on the support seat 6, and the linkage push rod 4 passes through the support seat 6 and is inserted into the insertion groove 21 of the piston 2; based on such a setting, the present invention facilitates the linkage push rod 4 to pass through the support seat 6 and be inserted into the insertion groove 21.

[0064] Furthermore, in the present invention, the plug-in groove 21 is arranged to penetrate the piston 2; a support seat 6 is provided at one end of the plug-in groove 21 away from the motor drive shaft 1; the through hole 61 is clearance-matched with the linkage push rod 4; such an arrangement can seal the piston 2 and facilitate the actual assembly operation of the linkage push rod 4.

[0065] Furthermore, in the present invention, the plug-in groove 21 includes a first groove 211 and a second groove 212, and the inner diameter of the second groove 212 is larger than the inner diameter of the first groove 211; the first groove 211 is connected to the second groove 212, and the first groove 211 is arranged close to the drive motor shaft; based on the above design, the present invention makes the plug-in groove 21 equivalent to a stepped groove structure, and such a setting is mainly convenient for limiting the end of the elastic member 8.

[0066] Furthermore, in the present invention, the support plunger 5 and the connecting ball head are both clearance-matched with the inner wall of the adjacent plug-in recess 21. Based on such a setting, the support plunger 5 and the connecting ball head 43 can have a certain offset in the plug-in recess 21, which better avoids interference problems and increases the deviation compensation capability of the piston 2 and the motor drive shaft 1 itself.

[0067] Furthermore, in the present invention, the through hole 61 and the linkage push rod 4 are clearance-matched; the above-mentioned design can avoid motion interference between the support seat 6 and the linkage push rod 4.

[0068] Based on the above design, even if the motor drive shaft 1 and the piston 2 have a relative eccentricity error, when the motor drive shaft 1 drives the piston 2 to move, the piston 2 and the motor drive shaft 1 have automatic deviation compensation capabilities, thereby reducing or avoiding eccentric wear of the piston 2 on the cylinder body 3.

[0069] Furthermore, the elastic member 8 in the present invention is a cylindrical coil spring or a rubber spring; of course, it can also be other elastic structures; in addition, the elastic member 8 in the present invention is sleeved on the base rod; based on the above design, it is convenient to sleeve the elastic member 8 on the linkage push rod 4. At the same time, the present invention adopts the above design, which also makes the elastic member 8 equivalent to being directly arranged on the linkage push rod 4. Based on such a setting, it is convenient to arrange and place the elastic member 8 in the plug-in groove 21.

[0070] Furthermore, in the present invention, the basic rod includes a first connecting rod 41 and a second connecting rod 42, the inner diameter of the second connecting rod 42 is larger than the outer diameter of the first connecting rod 41; the second connecting rod 42 is connected to the drive motor shaft through the first connecting rod 41; the present invention facilitates the connection between the motor drive shaft 1 and the piston 2 through the arrangement of the first connecting rod 41 and the second connecting rod 42.

[0071] In addition, in the present invention, the outer diameter of the second connecting rod 42 is not less than the inner diameter of the through hole 61 or the first groove 211; based on such a setting, the second connecting rod 42 can be used to support the elastic member 8. Here, by limiting the size of the second connecting rod 42, it is possible to prevent the elastic member 8 from entering the through hole 61 or the first groove 211 and affecting the normal use of the elastic member 8; at the same time, based on the above design, the present invention allows the elastic member 8 to be directly sleeved on the base rod without the need for an additional fixed connection method.

[0072] Furthermore, in the present invention, the outer diameter of the support plunger 5 and the outer diameter of the connecting ball head 43 are both smaller than the inner diameter of the plug-in groove 21; based on such a setting, the support plunger 5 and the connecting ball head 43 can have a certain offset in the plug-in groove 21, so as to better avoid interference problems; and increase the deviation compensation capability of the piston 2 and the motor drive shaft 1 themselves.

[0073] A wire-controlled hydraulic brake system includes the hydraulic brake device; in other words, the hydraulic brake device disclosed in the present invention can be used in a wire-controlled hydraulic brake system; based on such a setting, the present invention facilitates subsequent application on the whole vehicle; and performs active pressure-building braking or emergency braking to avoid collision on the vehicle.

[0074] In addition, in the present invention, the motor drive shaft 1 is connected to the motor through a "rotational-linear" transmission mechanism 2-1, and the transmission mechanism 2-1 converts the rotational motion of the motor 1-1 into the linear motion of the motor drive shaft 1; the above-mentioned transmission mechanism 2-1 can be a worm gear, a gear rack, a ball screw, etc.

[0075] In addition, the above structures can be reasonably allocated and selected according to needs, and do not need to be all set in one braking device. The essential purpose is to enable the motor drive shaft 1 and the piston 2 to have automatic self-aligning ability under the premise that the motor drive shaft 1 can control the movement of the piston 2, thereby reducing the wear on the cylinder body.

[0076] specific:

[0077] The present invention discloses a hydraulic brake device, which mainly comprises a cylinder body 3 and a pressure chamber 31 arranged in the cylinder body 3, and a motor drive shaft 1 drives a piston 2 to make a linear motion in the cylinder body 3 to generate a hydraulic pressure; in the present invention, the motor drive shaft 1 is connected with a linkage push rod 4, and the linkage push rod 4 comprises a base rod, and a connecting ball head 43 is provided at the end of the base rod, and the connecting ball head 43 is equivalent to a convex spherical structure. At the same time, a support plunger 5 is provided on the inner wall of the plug-in groove 21 on the piston 2, and a positioning groove 51 is provided on the support plunger 5. Based on the setting of the positioning groove 51, a conical surface (or concave spherical surface) structure is formed on the support plunger 5. In addition, an elastic member 8 is sleeved on the linkage push rod 4, and the elastic member 8 makes its elastic force act between the motor drive shaft 1 and the piston 2, so that the connecting ball head 43 and the supporting plunger 5 are in contact with each other and connected; at the same time, in the present invention, the connecting ball head 43 and the supporting plunger 5 have a radial gap with the inner side wall of the plug-in groove 21, and such a setting enables the connecting ball head 43 and the supporting plunger 5 to move radially.

[0078] The piston 2 has a support seat 6 with a hole structure, and the linkage push rod 4 is installed through the hole and has a radial gap with the hole; the support seat 6 can be configured to radially cooperate with the linkage push rod 4.

[0079] The elastic member 8 is a cylindrical helical spring or a rubber spring.

[0080] One or more seals 7 are arranged on the piston 2 , or one or more seals 7 are arranged on the cylinder body 3 .

[0081] The motor drive shaft 1 is connected to the motor via a “rotation-to-linear” transmission mechanism 2 - 1 , and the transmission mechanism 2 - 1 converts the rotational motion of the motor 1 - 1 into the linear motion of the motor drive shaft 1 .

[0082] The transmission mechanism 2-1 can be a worm gear, a gear rack, a ball screw, etc.

[0083] The device can be applied to a wire-controlled hydraulic brake system.

[0084] Based on the above design, the present invention can realize the hydraulic brake device with the function of automatic centering, automatically compensate for angular direction deviation and translation direction deviation, avoid eccentric wear of the cylinder body 3, and improve the durability; in addition, the overall structure of the hydraulic brake device is relatively simple and the material cost is low.

[0085] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A hydraulic brake device, It is characterized in that It comprises a cylinder body; a motor drive shaft and a piston are arranged in the cylinder body; the motor drive shaft is connected to the piston through a linkage mechanism; The linkage mechanism comprises a linkage push rod connected to the motor drive shaft and a plug-in sink groove arranged on the piston; The motor drive shaft is connected to the plug-in sink groove on the piston through a linkage push rod; The linkage push rod can move in the insertion sink.

2. A hydraulic brake device according to claim 1, It is characterized in that The linkage mechanism also includes a support plunger arranged in the plug-in sink; the linkage push rod and the support plunger are arranged to press against each other; The linkage push rod is connected with the piston through a supporting plunger.

3. A hydraulic brake device according to claim 2, It is characterized in that The support plunger is provided with a positioning groove, which is a spherical groove or a conical groove.

4. A hydraulic brake device according to any one of claims 1 to 3, It is characterized in that The linkage push rod comprises a base rod, and a connecting ball head is arranged at the end of the base rod; the maximum outer diameter of the connecting ball head is greater than the outer diameter of the base rod.

5. A hydraulic brake device according to any one of claims 1 to 3, It is characterized in that The linkage mechanism also includes a pre-tightening mechanism, which includes an elastic member arranged in the plug-in sink groove; one end of the elastic member is connected to the linkage push rod, and the other end is connected to the piston.

6. A hydraulic brake device according to claim 1, It is characterized in that A support seat is arranged in the plug-in sink.

7. A hydraulic brake device according to claim 6, It is characterized in that The support seat is provided with a through hole, and the linkage push rod passes through the support seat and is inserted into the insertion groove of the piston.

8. A hydraulic brake device according to claim 6, It is characterized in that The plug-in groove is arranged through the piston; a support seat is arranged at one end of the plug-in groove away from the motor drive shaft; and the through-hole is clearance-matched with the linkage push rod.

9. A hydraulic brake device according to claim 1, It is characterized in that The plug-in groove includes a first groove and a second groove, the inner diameter of the second groove is larger than the inner diameter of the first groove; the first groove is connected to the second groove, and the first groove is arranged close to the drive motor shaft.

10. A hydraulic brake device according to claim 2, It is characterized in that The supporting plunger and the connecting ball head are both clearance-matched with the inner walls of the adjacent plug-in sinks.

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