Brake master cylinder, brake assembly and vehicle

Abstract

The utility model belongs to the technical field of automobile parts, and particularly relates to a brake master cylinder, a brake assembly and a vehicle. The brake master cylinder comprises a shell, a piston and a displacement sensor, a first hole is formed in the shell, and the piston is installed in the first hole in a reciprocating motion mode; the displacement sensor comprises a generator, at least part of the generator is inserted into the first hole, and one end of the generator is connected with one axial end of the piston. According to the brake master cylinder, the generator is arranged at the axial end of the piston, and the first hole used for installing the piston in the brake master cylinder is used for containing the generator, so that compared with the prior art that the generator is arranged on the radial outer side of the piston, an installation hole used for installing the generator does not need to be formed in the radial outer side of the first hole; therefore, the size of the cross section of the brake master cylinder is small, and the brake master cylinder can be flexibly matched with an installation space on a vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts, and particularly relates to a brake master cylinder, a brake assembly and a vehicle. Background Art

[0002] The related technology provides a brake master cylinder, the housing of the brake master cylinder has a first hole, a reciprocating master cylinder piston is installed in the first hole, a mounting hole is provided on the housing radially outside the first hole, and the axis of the mounting hole is parallel to the axis of the first hole. The displacement sensor includes a bracket, a generator and a receiver, the bracket is fixed to one end of the master cylinder piston extending out of the first hole, one end of the generator is fixed to the bracket, the other end of the generator is inserted into the mounting hole, and the receiver is fixed to the housing. When the vehicle brakes, the generator moves with the master cylinder piston, and the receiver receives the signal generated by the generator to monitor the displacement of the piston, thereby obtaining the braking depth of the pedal.

[0003] However, the brake master cylinder of the related art needs to provide a mounting hole for mounting the generator on the radial outer side of the master cylinder hole, which results in a larger cross-sectional area of ​​the brake master cylinder and cannot more flexibly match the installation space on the vehicle. Utility Model Content

[0004] The technical problem to be solved by the utility model is: for the brake master cylinder of the related technology, the cross-sectional area of ​​the brake master cylinder is large and cannot be more flexibly matched with the installation space on the vehicle, and a brake master cylinder, a brake assembly and a vehicle are provided.

[0005] In order to solve the above technical problems, on the one hand, the embodiment of the utility model provides a brake master cylinder, including a housing, a piston and a displacement sensor, wherein a first hole is provided in the housing, and the piston is reciprocatingly installed in the first hole;

[0006] The displacement sensor comprises a generator, which is at least partially inserted into the first hole, and one end of the generator is connected to one axial end of the piston.

[0007] Optionally, the generator includes a fixed body and a magnetic member, one end of the fixed body is detachably connected to the end of the piston near the second hole, the other end can reciprocate in the second hole, and the magnetic member is fixed to the outer wall of the other end of the fixed body.

[0008] Optionally, an end portion of the fixed body is provided with an external thread, an end portion of the piston is provided with an internal threaded hole extending along its axial direction, and the fixed body is threadedly connected to the piston.

[0009] Optionally, a second hole is further provided in the shell, the cross-sectional dimension of the second hole is smaller than the cross-sectional dimension of the first hole, the second hole is located at one axial end of the first hole and is connected to the first hole, and the other end of the generator can penetrate into the second hole.

[0010] Optionally, the displacement sensor further includes a receiver, wherein the receiver is arranged on the side wall of the shell corresponding to the second hole, and the receiver is used to receive the signal generated by the generator.

[0011] Optionally, the housing comprises a master cylinder housing and a sensor housing arranged side by side along the axial direction of the piston, the first hole is formed in the master cylinder housing, and the second hole is formed in the sensor housing;

[0012] The master cylinder housing and the sensor housing are separately arranged and detachably connected;

[0013] or,

[0014] The master cylinder housing and the sensor housing are integrally formed.

[0015] Optionally, the master cylinder housing and the sensor housing are separately arranged and detachably connected, and a guide hole connecting the first hole and the second hole is also provided in the housing. The other end of the generator passes through the guide hole and can reciprocate in the second hole. The hole wall of the guide hole supports the generator, and the guide hole is at least partially formed on the master cylinder housing and / or the sensor housing.

[0016] Optionally, the receiver is integrally formed in the sensor housing.

[0017] Optionally, the side wall of the sensor housing includes an observation portion, which is transparent and arranged corresponding to the second hole.

[0018] Optionally, a positioning ring groove is provided at the end of the piston connected to the generator, and the positioning ring groove has an opening facing one side of the generator, and one end of the reset member is inserted into the positioning ring groove through the opening and abuts against the bottom wall of the positioning ring groove.

[0019] In the brake master cylinder of the utility model, the generator is at least partially inserted in the first hole, and one end of the generator is connected to the axial end of the piston, so that the generator is arranged at the axial end of the piston and the generator is accommodated by using the first hole in the brake master cylinder for mounting the piston. Compared with the prior art in which the generator is arranged radially outside the piston, the brake master cylinder of the utility model does not need to provide a mounting hole for mounting the generator radially outside the first hole, so that the cross-sectional size of the brake master cylinder is smaller, and it can more flexibly match the installation space on the vehicle.

[0020] On the other hand, an embodiment of the utility model provides a brake assembly, including a pedal and the above-mentioned brake master cylinder, wherein the pedal is connected to the piston of the brake master cylinder.

[0021] On the other hand, an embodiment of the present utility model provides a vehicle, comprising the above-mentioned brake master cylinder or brake assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a brake master cylinder provided by an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 Schematic diagram of the structure when the vehicle is in braking state;

[0024] Figure 3 It is a structural schematic diagram of a brake master cylinder provided by another embodiment of the utility model;

[0025] Figure 4 yes Figure 3 Isometric view of.

[0026] The reference numerals in the specification are as follows:

[0027] 1. Housing; 11. Master cylinder housing; 12. Sensor housing; 13. First hole; 14. Second hole; 15. Guide hole; 16. Positioning ring groove; 2. Piston; 3. Generator; 4. Receiver; 5. Reset member; 6. Push rod; 7. Dust cover. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] like Figure 1 As shown, an embodiment of the utility model provides a brake master cylinder, including a housing 1, a piston 2 and a displacement sensor. A first hole 13 is provided in the housing 1, and the piston 2 is reciprocatingly mounted in the first hole 13.

[0030] The displacement sensor includes a generator 3, which is at least partially inserted in the first hole 13. One end of the generator 3 is connected to one axial end of the piston 2, and the other axial end of the piston 2 is suitable for connecting to the pedal of the vehicle. When the pedal is pressed to brake the vehicle, the piston 2 moves toward the generator 3.

[0031] Specifically, Figure 2As shown, when the vehicle brakes, the pedal drives the piston 2 to move, and the generator 3 fixed on the piston 2 moves with the piston 2. The receiver 4 of the displacement sensor used in conjunction with the generator 3 receives the displacement signal generated by the generator 3 and transmits it to the control unit on the vehicle, thereby detecting the displacement of the piston 2 to obtain the braking depth of the pedal.

[0032] It should be noted that the other end of the generator 3 is magnetic, and a chip and a circuit are provided in the receiver 4. When the generator 3 moves synchronously with the piston 2, the magnetic field strength around the generator 3 changes. The chip in the receiver 4 converts the change in the magnetic field strength into an electrical signal and outputs it to the control unit on the vehicle to detect the displacement of the generator 3 and then obtain the braking depth of the pedal.

[0033] In the brake master cylinder of the utility model, the generator 3 is at least partially inserted in the first hole 13, and one end of the generator 3 is connected to the axial end of the piston 2, so that the generator 3 is arranged at the axial end of the piston 2 and the first hole 13 in the brake master cylinder for installing the piston 2 is used to accommodate the generator 3. Compared with the prior art in which the generator 3 is arranged on the radial outside of the piston 2, the brake master cylinder of the utility model does not need to set a mounting hole for installing the generator 3 on the radial outside of the first hole 13, so that the cross-sectional size of the brake master cylinder is smaller, and it can more flexibly match the installation space on the vehicle.

[0034] In one embodiment, the generator 3 includes a fixed body and a magnetic component, one end of the fixed body is detachably connected to one axial end of the piston 2, and the magnetic component is fixed to the outer wall of the other end of the fixed body.

[0035] Since one end of the fixed body is detachably connected to the piston 2 , when the generator 3 is replaced, after removing the housing 1 , the generator 3 can be removed from the piston 2 without removing the piston 2 , so as to facilitate replacement of the generator 3 .

[0036] In one embodiment, the magnetic member is a magnet.

[0037] In one embodiment, an end portion of the fixed body is provided with an external thread, an end portion of one axial end of the piston 2 is provided with an internal thread hole extending along its axial direction, and the fixed body is threadedly connected to the piston 2 .

[0038] In one embodiment, a second hole 14 is further provided in the housing 1. The second hole 14 is located at one axial end of the first hole 13. The cross-sectional dimension of the second hole 14 is smaller than the cross-sectional dimension of the first hole 13. The second hole 14 is located at one axial end of the first hole 13 and is connected to the first hole 13. The other end of the generator 3 can penetrate into the second hole 14. Since the cross-sectional dimension of the second hole 14 is smaller than the cross-sectional dimension of the first hole 13, the cross-sectional dimension of the outer wall of the housing 1 corresponding to the second hole 14 can be designed to be smaller than the cross-sectional dimension of the outer wall of the housing 1 corresponding to the first hole 13, so as to reduce the occupied space of the housing 1 by reasonably designing the outer shape of the housing 1.

[0039] In one embodiment, the second hole 14 extends along the axial direction of the piston 2, and the cross-sectional shape of the second hole 14 is adapted to the outer shape of the generator 3. Of course, the second hole 14 can be an irregular hole as long as it can accommodate the generator 3.

[0040] In one embodiment, the displacement sensor further includes a receiver 4, which is disposed on the side wall of the housing 1 corresponding to the second hole 14, and the receiver 4 is used to receive the signal generated by the generator 3. Compared with disposing the receiver 4 on the side wall of the housing 1 corresponding to the first hole 13, since the cross-sectional dimension of the second hole 14 is smaller than the cross-sectional dimension of the first hole 13, when the receiver 4 is disposed on the side wall of the housing 1 corresponding to the second hole 14, the vertical distance between the receiver 4 and the generator 3 reciprocating in the second hole 14 is smaller, which is conducive to the receiver 4 receiving the signal generated by the generator 3.

[0041] In one embodiment, the other end of the generator 3 is inserted into the second hole 14, so that the generator 3 can be in the second hole 14 when not braking, avoiding the situation where the other end of the generator 3 needs to be aligned to enter the second hole 14 when the vehicle brakes, thereby increasing the difficulty of processing and installing the generator 3 and the second hole 14.

[0042] In one embodiment, the housing 1 includes a master cylinder housing 11 and a sensor housing 12 which are arranged side by side along the axial direction of the piston 2, a first hole 13 is formed in the master cylinder housing 11, a second hole 14 is formed in the sensor housing 12, the master cylinder housing 11 and the sensor housing 12 are separately arranged and detachably connected, or the master cylinder housing 11 and the sensor housing 12 are integrally formed.

[0043] In one embodiment, the master cylinder housing 11 and the sensor housing 12 are separately arranged and detachably connected. Specifically, one axial end of the master cylinder housing 11 and one axial end of the sensor housing 12 are detachably connected by bolts. A first connecting hole penetrating along the axial direction is provided on the end face of the master cylinder housing 11, and a second connecting hole penetrating along the axial direction is provided on the end face of the sensor housing 12. One end of the bolt passes through the first connecting hole and the second connecting hole and is fastened by a nut.

[0044] Furthermore, an O-ring or a gasket is provided between the end surface of the master cylinder housing 11 and the end surface of the sensor housing 12 .

[0045] In the prior art brake master cylinder, the receiver 4 is installed in the mounting hole on the housing with interference fit, which results in the receiver 4 being unable to be used after being disassembled during maintenance, thereby resulting in high inspection costs. In the brake master cylinder of the present utility model, the receiver 4 is arranged on the sensor housing 12, and the sensor housing 12 is detachably connected to the master cylinder housing 11. Therefore, when inspecting the receiver 4, the sensor housing 12 can be disassembled and the receiver 4 can be replaced, thereby reducing the inspection cost and inspection difficulty.

[0046] In one embodiment, the receiver 4 is integrally formed in the sensor housing 12 .

[0047] In one embodiment, an external plug-in interface is provided on the end face of the sensor housing 12 at one axial end away from the master cylinder housing 11, and the external plug-in interface is used to be electrically connected to a control unit on the vehicle, so that the receiver 4 can transmit the sensed signal to the control unit. The external plug-in interface is provided on the end face of the sensor housing 12 at one axial end away from the master cylinder housing 11, which can prevent the connection line between the external plug-in interface and the control unit from occupying the radial space outside the brake master cylinder.

[0048] In one embodiment, the master cylinder housing 11 includes a first master cylinder housing and a second master cylinder housing arranged side by side along the axial direction of the piston 2, the first master cylinder housing and the second master cylinder housing are detachably connected, the first hole 13 is formed in the second master cylinder housing, and the second master cylinder housing is detachably connected to the sensor housing 12. When replacing the generator 3, the sensor housing 12 is removed to expose the other end of the generator 3. Of course, in other embodiments, the second master cylinder housing and the sensor housing 12 can be integrally formed, and the second master cylinder housing and the sensor housing 12 need to be removed when replacing the displacement sensor.

[0049] In one embodiment, the sensor housing 12 includes a tube portion and an end portion connected to one end of the tube portion, the tube portion extends axially along the first hole 13, the diameter of the inner hole of the tube portion is smaller than the diameter of the first hole 13, the wall thickness of the tube portion is 4 to 5 mm, and the chip and circuit of the receiver 4 are close to the outer wall of the tube portion, so that the receiver 4 is closer to the generator 3 while ensuring the structural strength of the tube portion, thereby being able to receive the signal more accurately.

[0050] In one embodiment, the outer wall of the corresponding second hole 14 of the sensor housing 12 is parallel to the axis of the piston 2, and the receiver 4 is fixed on the outer wall of the sensor housing 12 parallel to the axis of the piston 2, so that the vertical distance between the receiver 4 and the generator 3 is relatively fixed, so that the signal received by the receiver 4 is relatively stable.

[0051] In one embodiment, the master cylinder housing 11 and the sensor housing 12 are separately arranged and detachably connected. A guide hole 15 connecting the second hole 14 and the first hole 13 is provided on the housing 1. The other end of the generator 3 passes through the guide hole 15 and can reciprocate in the second hole 14. The hole wall of the guide hole 15 supports the generator 3. The guide hole 15 is at least partially formed on the master cylinder housing 11 and / or the sensor housing 12.

[0052] Specifically, when the vehicle is not braked, the other end of the generator 3 is inserted into the guide hole 15. When the vehicle is braked, the moving piston 2 drives the generator 3 to move toward the second hole 14. The guide hole 15 supports the generator 3 to guide the generator 3 so that the movement of the generator 3 is smoother.

[0053] In one embodiment, the guide hole 15 is formed at one end of the master cylinder housing 11 close to the sensor housing 12 .

[0054] In other embodiments, a portion of the guide hole 15 may be formed on the sensor housing 12 , and another portion may be formed on the master cylinder housing 11 .

[0055] In one embodiment, a sealing groove is provided on the hole wall of the guide hole 15, and an O-ring is installed in the sealing groove, so that the generator 3 penetrating the guide hole 15 is sealed with the hole wall.

[0056] In one embodiment, the side wall of the sensor housing 12 includes an observation portion, which is transparent and arranged corresponding to the second hole 14, and the observation portion allows personnel to observe the situation in the second hole 14. In the brake master cylinder in the prior art, in order to prevent the generator 3 and the receiver 4 from being exposed to the outside, the generator 3 and the receiver 4 are covered with a shell, resulting in the inability to observe the cause of the problem when the product detects an abnormality. In the brake master cylinder of the utility model, the observer can observe the situation in the second hole 14 through the transparent observation portion, which is conducive to observing and knowing the cause of the problem when the product detects an abnormality.

[0057] In one embodiment, a reset member 5 is further included, and the reset member 5 is installed in the first hole 13, with one end of the reset member 5 abutting against the piston 2, and the other end abutting against the hole wall of the first hole 13 opposite to the piston 2. When the vehicle brakes, the brake pedal drives the piston 2 to overcome the elastic force of the reset member 5 and move, and the piston 2 compresses the reset member 5. After the brake is released, the piston 2 is reset under the elastic force of the reset member 5.

[0058] In one embodiment, a positioning ring groove 16 is provided on the end of the piston 2 connected to the generator 3, and the positioning ring groove 16 has an opening facing the generator 3. One end of the reset member 5 is inserted into the positioning ring groove 16 through the opening and abuts against the bottom wall of the positioning ring groove 16 to radially limit the reset member 5 through the positioning ring groove 16.

[0059] In one embodiment, an avoidance groove is provided at the end of the axial end of the piston 2 connected to the generator 3. The avoidance groove is located radially inside the positioning ring groove 16 and is connected to the positioning ring groove 16. The depth of the avoidance groove is less than the depth of the positioning ring groove 16, so that a connecting platform is formed on the end of the piston 2 in the positioning ring groove 16, and the axial end of the generator 3 penetrates into the avoidance groove and is connected to the connecting platform.

[0060] The setting of the avoidance groove can reduce the length of the piston 2 and the generator 3 after being assembled together, so as to reduce the movement area of ​​the assembly composed of the piston 2 and the generator 3 during reciprocating motion, thereby reducing the length of the first hole 13 and the second hole 14, and further reducing the volume of the brake master cylinder.

[0061] In one embodiment, the reset member 5 is a spring, and the spring is sleeved outside the generator 3 .

[0062] In one embodiment, it also includes a push rod 6 and a dust cover 7. The axial end of the piston 2 away from the generator 3 is provided with a receiving groove, and the end of the shell 1 away from the generator 3 is provided with an avoidance hole. One end of the push rod 6 passes through the avoidance hole and is inserted into the receiving groove, and the other end is suitable for connecting with the pedal of the vehicle. The dust cover 7 is sleeved on the outer side of the end of the push rod 6 extending out of the shell 1 to prevent external dust from entering the shell 1.

[0063] In other embodiments, Figure 3 and Figure 4 As shown, the master cylinder housing 11 and the sensor housing 12 can be integrally formed.

[0064] In other embodiments, when the movement stroke of the piston 2 is limited, the second hole 14 may be omitted, and the generator 3 is entirely disposed in the first hole 13 .

[0065] In other embodiments, the fixed body may be clamped onto the piston 2 .

[0066] In other embodiments, the receiver 4 and the sensor housing 12 may be connected by fasteners, such as screws, bolts, etc.

[0067] In other embodiments, the receiver 4 may be fixed on the hole wall of the first hole 13 , or may be fixed on the outer wall of the housing 1 corresponding to the first hole 13 .

[0068] In addition, an embodiment of the utility model provides a brake assembly, including a pedal and a brake master cylinder in any of the above embodiments, the pedal is connected to the piston 2 of the brake master cylinder, and when the vehicle brakes, the pedal drives the piston 2 to move toward the generator 3.

[0069] In addition, an embodiment of the utility model provides a vehicle, comprising the brake master cylinder or brake assembly of the above embodiment.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A brake master cylinder, characterized in that: The invention comprises a housing (1), a piston (2) and a displacement sensor, wherein a first hole (13) is provided in the housing (1), and the piston (2) is reciprocatingly mounted in the first hole (13); The displacement sensor comprises a generator (3), wherein the generator (3) is at least partially inserted into the first hole (13), and one end of the generator (3) is connected to one axial end of the piston (2).

2. The brake master cylinder according to claim 1, characterized in that: The generator (3) comprises a fixed body and a magnetic component, one end of the fixed body is detachably connected to one axial end of the piston (2), and the magnetic component is fixed to the outer wall of the other end of the fixed body.

3. The brake master cylinder according to claim 2, characterized in that: The end of the fixed body is provided with an external thread, the end of one axial end of the piston (2) is provided with an internal thread hole extending along its axial direction, and the fixed body is threadedly connected to the piston (2).

4. The brake master cylinder according to claim 1, characterized in that: A second hole (14) is also provided in the shell (1), the cross-sectional dimension of the second hole (14) being smaller than the cross-sectional dimension of the first hole (13), the second hole (14) being located at one axial end of the first hole (13) and being in communication with the first hole (13), and the other end of the generator (3) being capable of penetrating into the second hole (14).

5. The brake master cylinder according to claim 4, characterized in that: The displacement sensor further comprises a receiver (4), wherein the receiver (4) is arranged on the side wall of the housing (1) corresponding to the second hole (14), and the receiver (4) is used to receive the signal generated by the generator (3).

6. The brake master cylinder according to claim 5, characterized in that: The housing (1) comprises a master cylinder housing (11) and a sensor housing (12) arranged side by side along the axial direction of the piston (2); the first hole (13) is formed in the master cylinder housing (11), and the second hole (14) is formed in the sensor housing (12); The master cylinder housing (11) and the sensor housing (12) are separately arranged and detachably connected; or, The master cylinder housing (11) and the sensor housing (12) are integrally formed.

7. The brake master cylinder according to claim 6, characterized in that: The master cylinder housing (11) and the sensor housing (12) are separately arranged and detachably connected. A guide hole (15) is also arranged in the housing (1) to connect the first hole (13) and the second hole (14). The other end of the generator (3) passes through the guide hole (15) and can reciprocate in the second hole (14). The hole wall of the guide hole (15) supports the generator (3). The guide hole (15) is at least partially formed on the master cylinder housing (11) and / or the sensor housing (12).

8. The brake master cylinder according to claim 6, characterized in that: The receiver (4) is integrally formed in the sensor housing (12).

9. The brake master cylinder according to claim 6, characterized in that: The side wall of the sensor housing (12) comprises an observation portion, which is transparent and arranged corresponding to the second hole (14).

10. The brake master cylinder according to any one of claims 1 to 9, characterized in that: It also comprises a reset member (5), which is installed in the first hole (13), one end of the reset member (5) abuts against the piston (2), and the other end abuts against the hole wall of the first hole (13) opposite to the piston (2).

11. The brake master cylinder according to claim 10, characterized in that: A positioning ring groove (16) is provided at the end of the piston (2) connected to the generator (3); the positioning ring groove (16) has an opening facing one side of the generator (3); one end of the reset member (5) is inserted into the positioning ring groove (16) through the opening and abuts against the bottom wall of the positioning ring groove (16).

12. A brake assembly, characterized in that: The invention comprises a pedal and a brake master cylinder according to any one of claims 1 to 11, wherein the pedal is connected to a piston (2) of the brake master cylinder.

13. A vehicle, characterized in that: It comprises the brake master cylinder according to any one of claims 1 to 11 or the brake assembly according to claim 12.

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