Brake caliper device

Abstract

The application relates to the field of braking devices, in particular to a brake caliper device which comprises a brake main body, a pair of caliper arms oppositely arranged in a first direction and respectively installed on the two sides of the brake main body, a driving unit arranged in the brake main body and used for driving the pair of caliper arms to clamp a wheel, a containing cavity is arranged on the brake main body and penetrates through the brake main body in a second direction perpendicular to the first direction, the brake caliper device further comprises a tread cleaning unit and a hanger, the tread cleaning unit comprises a shell, a telescopic driving assembly arranged in the shell, and a cleaning assembly connected with the telescopic driving assembly, the shell comprises a fixed part fixedly arranged in the containing cavity and a stretching part stretched out of the containing cavity, and the hanger is connected with the stretching part. In the brake caliper device, the shell of the tread cleaning unit serves as a connecting piece connecting the brake main body and the hanger, so that the brake caliper device has the functions of braking and tread cleaning at the same time, and the structure is more compact.

Description

Technical Field

[0001] This invention relates to the field of braking equipment, specifically a brake caliper device. Background Technology

[0002] Existing rail vehicles include brake caliper devices and tread cleaning devices. The brake caliper devices are used to brake the vehicle and are connected to the bogie of the vehicle via a hanger. The tread cleaning devices are also connected to the bogie and can clean the wheel tread, thereby improving the condition of the wheel tread, increasing the adhesion between the wheel and the rail, and preventing the wheel tread from becoming out of round.

[0003] As shown in Chinese Patent Publication No. CN213478993, there is a design in the prior art that combines the brake caliper device and the tread cleaning device. However, in this existing design, the tread cleaning device is directly installed on the hanger of the brake caliper device, which is not compact enough and occupies a lot of space. Summary of the Invention

[0004] The purpose of this invention is to provide a brake caliper device that has both braking and tread cleaning functions and a more compact structure.

[0005] To achieve the above objectives, the present invention proposes a brake caliper device, comprising a brake body, a pair of caliper arms disposed opposite to each other in a first direction and respectively mounted on both sides of the brake body, and a drive unit disposed within the brake body for driving the pair of caliper arms to clamp the wheel. The brake caliper device further comprises a tread cleaning unit and a hanger. The brake body has a receiving cavity that extends through the brake body in a second direction perpendicular to the first direction. The tread cleaning unit comprises a housing, a telescopic drive assembly disposed within the housing, and a cleaning assembly connected to the telescopic drive assembly. The telescopic drive assembly is used to drive the cleaning assembly to move relative to the housing in the second direction. The housing comprises a fixed part fixed within the receiving cavity and a protruding part extending out of the receiving cavity. The hanger is connected to the protruding part.

[0006] As a further improvement of the present invention, the housing is provided with a piston chamber, the piston chamber having an opening on a first side in a second direction and a first end face on a second side in a second direction, the telescopic drive assembly includes a piston member slidably disposed in the piston chamber, the housing is provided with a first channel extending from the first end face to the outer surface of the housing, and the cleaning assembly is connected to the piston member.

[0007] As a further improvement of the present invention, the protrusion includes a first protrusion and a second protrusion located on a first side and a second side in a second direction, respectively, and the hanger includes a first hanger and a second hanger respectively sleeved on the first protrusion and the second protrusion.

[0008] As a further improvement of the present invention, the second protrusion has an annular outer conical surface, the second hanger has an annular inner conical surface that mates with the outer conical surface, the first channel extends from the first end face to the end face of the housing, and the brake caliper device further includes a first fastener connected to the first channel and abutting against the second hanger, the first fastener having a connecting hole inside that communicates with the first channel and extends to its outer surface located outside the first channel.

[0009] As a further improvement of the present invention, the first channel extends from the first end face to the outer peripheral surface of the housing, the driving unit includes a pneumatic drive component, and the braking body is provided with a second channel, one end of the second channel is connected to the pneumatic drive component, and the other end extends through to the inner wall of the receiving cavity to communicate with the first channel.

[0010] As a further improvement of the present invention, the outer diameter of the fixing part is smaller than the diameter of the receiving cavity, and the brake caliper device further includes two sealing rings disposed between the fixing part and the receiving cavity. The two sealing rings are spaced apart and form an intermediate cavity between the fixing part and the receiving cavity. The first channel and the second channel are both connected to the intermediate cavity. At least two first channels are provided along the circumferential direction of the housing.

[0011] As a further improvement of the present invention, the piston component includes a piston body and a flange protruding from the outer periphery of the piston body near the first end face. The telescopic drive assembly also includes a ring fixed in the receiving cavity and disposed opposite to the flange in a second direction, and a first elastic member disposed between the ring and the flange.

[0012] As a further improvement of the present invention, the piston member is provided with a slider cavity, the cleaning assembly includes a bracket pivotally connected to the piston member via a rotating shaft and a cleaning block connected to the bracket, the bracket part extends into the slider cavity and the maximum width of the extended part is less than the diameter of the slider cavity, the telescopic drive assembly also includes a slider slidably disposed in the slider cavity to abut the bracket, and a second elastic member disposed between the slider and the end face of the slider cavity, at least one of the two sides of the bracket that contact the slider is an arc surface.

[0013] As a further improvement of the present invention, both the first hanger and the second hanger include a sleeve portion sleeved around the periphery of the protrusion portion and an extension portion extending from the sleeve portion to both sides in a first direction, wherein the extension portion is provided with two connecting holes spaced apart in the first direction.

[0014] As a further improvement of the present invention, the brake caliper device further includes a second fastener connected to the brake body and extending into the receiving cavity to abut against the housing.

[0015] The beneficial effects of this invention are:

[0016] The present invention provides a brake caliper device that uses the housing of the tread cleaning unit as a connector to connect the brake body and the hanger, so that the brake caliper device can have both braking and tread cleaning functions at the same time, and the structure is more compact. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the brake caliper device provided by the present invention;

[0018] Figure 2 A top view of the brake caliper device and wheel provided by the present invention;

[0019] Figure 3 The first embodiment of the brake caliper device and the wheel self-braking system provided by the present invention Figure 2 A schematic diagram of the structure after being cut open along the AA direction;

[0020] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the structure after removing components such as wheels, tread cleaning units, and hangers.

[0021] Figure 5 This is a cross-sectional structural diagram of the housing, hanger, and first fastener in the brake caliper device provided by the present invention;

[0022] Figure 6 for Figure 3 A partial structural diagram of the upper right part;

[0023] Figure 7 The first embodiment of the brake caliper device and the wheel self-braking system provided by the present invention Figure 3 A schematic diagram of the structure after BB section;

[0024] Figure 8 for Figure 5 A magnified structural diagram of point A in the middle;

[0025] Figure 9 This is a schematic diagram of the structure of the housing and hanger in the brake caliper device provided by the present invention;

[0026] Figure 10 The second embodiment of the brake caliper device and the wheel self-braking system provided by the present invention Figure 2 A schematic diagram of the structure after being cut open along the AA direction;

[0027] Figure 11 for Figure 10 A magnified structural diagram of section B.

[0028] In the picture:

[0029] 100. Brake caliper assembly;

[0030] 10. Braking body; 11. Receiving cavity; 12. Second channel; 13. Second fastener; 14. Pad;

[0031] 20. Clamp arm; 21. Arm body; 22. Mounting component; 23. Friction block;

[0032] 30. Drive unit; 31. Pneumatic drive components;

[0033] 40. Hanger; 41. First hanger; 411. Positioning groove; 42. Second hanger; 43. Sleeve part; 44. Extension part; 45. Connecting hole;

[0034] 50. Tread surface cleaning unit;

[0035] 6. Housing; 61. Fixing part; 62. Protrusion part; 621. First protrusion part; 622. Second protrusion part; 63. Piston chamber; 631. Opening; 632. First end face; 64. First channel; 65. Positioning protrusion; 66. Bushing; 67. Sealing ring; 68. Intermediate cavity;

[0036] 7. Telescopic drive assembly; 71. Piston component; 711. Piston body; 712. Flange; 713. Sliding cavity; 72. First elastic element; 73. Ring sleeve; 74. Positioning ring; 75. Slider; 751. Slider body; 752. Positioning part; 753. First contact block; 76. Second elastic element;

[0037] 8. Cleaning assembly; 81. Bracket; 811. Second contact block; 82. Cleaning block; 83. Rotating shaft;

[0038] 9. First fastener; 91. Connecting hole; 92. First screw; 93. Disc spring;

[0039] 200. Wheel. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any modifications to the mechanism, method, or function made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0041] The terms used herein, such as "up," "down," "left," "right," "front," and "back," indicating spatial relative position, are for illustrative purposes to describe the relationship of one feature relative to another, as shown in the accompanying drawings. It is understood that, depending on the product's placement, these terms may be intended to include different orientations besides those shown in the figures, and should not be construed as limiting the claims. Furthermore, the descriptive term "horizontal" used herein is not entirely equivalent to being perpendicular to the direction of gravity, and allows for a certain angle of inclination.

[0042] like Figures 1 to 9 The diagram shows a schematic of the brake caliper device 100 proposed in the first embodiment of the present invention. The brake caliper device 100 includes a brake body 10, a pair of caliper arms 20 respectively installed on both sides of the brake body 10, and a drive unit 30 disposed in the brake body 10. The pair of caliper arms 20 are arranged opposite to each other in a first direction. In use, the brake caliper device 100 is installed on the bogie of a railway vehicle. When braking is required, the pair of caliper arms 20 clamp the two sides of the wheel 200 installed on the axle to brake the wheel 200, thereby reducing the running speed of the vehicle.

[0043] like Figure 2 As shown, each caliper arm 20 includes an arm body 21 mounted on the brake body 10, a mounting member 22 pivotally connected to the arm body 21, and a friction block 23 connected to the mounting member 22. The friction block 23 is used to contact the wheel 200, and its surface near the wheel 200 is provided with grooves to increase the friction force when it contacts the wheel 200. The mounting member 22 can rotate relative to the arm body 21, so that when the caliper arm 20 clamps the wheel 200, the friction block 23 connected to the mounting member 22 can remain in contact with the wheel 200. The above-mentioned first direction is the brake caliper device 100 in the direction of... Figure 2 The up and down directions in the shown state.

[0044] Continue to refer to Figure 3 and Figure 4 As shown, the braking body 10 has a receiving cavity 11, which is disposed through the braking body 10 in a second direction perpendicular to the first direction. The brake caliper device 100 also includes a tread cleaning unit 50 and a hanger 40. The tread cleaning unit 50 includes a housing 6, a telescopic drive assembly 7 disposed in the housing 6, and a cleaning assembly 8 connected to the telescopic drive assembly 7. The housing 6 is inserted into the receiving cavity 11 and extends out of the receiving cavity 11 in part. It includes a fixing part 61 fixed in the receiving cavity 11 and an extension part 62 extending out of the receiving cavity 11. The telescopic drive assembly 7 is used to drive the cleaning assembly 8 to move relative to the housing 6 in the second direction, so that the cleaning assembly 8 moves to the wheel 200 and contacts and cleans the tread of the wheel 200 (i.e., the outer peripheral surface of the wheel 200 in contact with the rail). The hanger 40 is connected to the extension 62, that is, the housing 6 of the tread cleaning unit 50 acts as a connector connecting the hanger 40 and the brake body 10. The entire brake caliper device 100 is connected to the vehicle's bogie via the hanger 40.

[0045] Continue to refer to Figures 5 to 7As shown, the housing 6 has a piston chamber 63, which has an opening 631 on the first side of the second direction and a first end face 632 on the second side of the second direction. It can be imagined that the first side of the second direction is located on the side of the brake body 10 closer to the wheel 200, and the second side is located on the side of the brake body 10 away from the wheel 200. The telescopic drive assembly 7 includes a piston 71 slidably disposed in the piston chamber 63. The housing 6 has a first channel 64 extending from the first end face 632 to the outer surface of the housing 6. The first channel 64 can extend along the second direction. An external air source can be connected to the piston chamber 63 through the first channel 64 to input gas into the piston chamber 63 so as to drive the piston 71 in the piston chamber 63 to extend toward the wheel 200 by air pressure. The cleaning assembly 8 is connected to the piston 71 and is driven by the piston 71 to contact the tread surface of the wheel 200.

[0046] Specifically, the piston component 71 includes a piston body 711 and a flange 712 protruding from the outer periphery of the piston body 711 near the first end face 632. The telescopic drive assembly 7 also includes a ring sleeve 73 and a first elastic element 72. The ring sleeve 73 is fixed inside the piston cavity 63 and is arranged opposite to the flange 712 in the second direction. The first elastic element 72 is disposed between the ring sleeve 73 and the flange 712. When the piston component 71 extends toward the wheel 200 under air pressure, the first elastic element 72 is compressed. When the piston component 71 needs to be reset, the external air source stops supplying air to the piston cavity 63, and the piston component 71 can be reset by the elastic force of the first elastic element 72. The first elastic element 72 is preferably helical elastic, and the helical spring is sleeved on the periphery of the piston body 711. A sealing ring may be provided between the flange 712 and the peripheral wall of the piston cavity 63 to ensure the sealing between the flange 712 and the peripheral wall of the piston cavity 63. The telescopic drive assembly 7 may also include a positioning ring 74 disposed on the side of the ring sleeve 73 near the opening 631. The positioning ring 74 is fixedly engaged in the piston chamber 63, and the ring sleeve 73 and the positioning ring 74 abut against each other. The positioning ring 74 serves to limit the position of the ring sleeve 73.

[0047] In a preferred embodiment, the housing 6 extends out of the receiving cavity 11 on both sides. The protrusion 62 includes a first protrusion 621 and a second protrusion 622 located on the first and second sides in the second direction, respectively. The hanger 40 includes a first hanger 41 and a second hanger 42, which are respectively sleeved on the first protrusion 621 and the second protrusion 622. When the brake body 10 is connected to the vehicle bogie, it is specifically connected to the vehicle bogie through the first hanger 41 and the second hanger 42. The first hanger 41 and the second hanger 42 define the relative positions of the housing 6 and the brake body 10 in the second direction, and the brake body 10 can swing relative to the first hanger 41 and the second hanger 42 so that a pair of caliper arms 20 can maintain the same angle with the wheel 200 to better clamp the wheel 200. In other embodiments, the hanger 40 can also be an integral unit, including a hanger body and a pair of lugs extending from the hanger body, which are respectively connected to the first protrusion 621 and the second protrusion 622.

[0048] The second extension 622 has an annular outer conical surface, and the second hanger 42 has an annular inner conical surface that matches the outer conical surface. When the second hanger 42 is sleeved around the second extension 622, the outer conical surface and the inner conical surface are in contact. The first channel 64 extends from the first end face 632 to the end face of the housing 6 away from the opening 631 in the second direction. The brake caliper device 100 also includes a first fastener 9 connected to the first channel 64 and abutting against the second hanger 42. The first fastener 9, in conjunction with the outer conical surface and the inner conical surface, presses the second hanger 42 against the second extension 622. The first fastener 9 has a connecting hole 91 inside that communicates with the first channel 64 and extends to its outer surface located outside the first channel 64. Thus, an external air source can be connected to the piston chamber 63 through the connecting hole 91 and the first channel 64.

[0049] Specifically, the first fastener 9 includes a first screw 92 and a disc spring 93. The first screw 92 includes a first post with external threads and a first screw head connected to one end of the first post. The first post is threadedly connected to the first channel 64. The disc spring 93 is sleeved around the first post and abuts against the first screw head and the second hanger 42. A connecting hole 91 passes through the first screw 92 in a second direction, that is, the connecting hole 91 and the first channel 64 extend in the same direction. The side of the connecting hole 91 away from the first channel 64 may be provided with threads for connecting an air pipe connector so as to connect to an external air source through an air pipe. The first screw 92 abuts against the second hanger 42 through the disc spring 93, so that the housing 6 will not rotate arbitrarily relative to the second hanger 42. Thus, the braking body 10 fixedly connected to the housing 6 will not rotate arbitrarily relative to the hanger 40.

[0050] The outer diameter of the fixing part 61 is smaller than the diameter of the receiving cavity 11, and there is a gap between them. The brake caliper device 100 also includes a bushing 66 disposed between the fixing part 61 and the receiving cavity 11. Specifically, two bushings 66 may be provided, and the two bushings 66 are spaced apart in the second direction to serve as an intermediate part to prevent the fixing part 61 and the inner wall of the receiving cavity 11 from directly contacting each other.

[0051] The piston component 71 has a sliding cavity 713. The cleaning assembly 8 includes a bracket 81 and a cleaning block 82 connected to the bracket 81. The bracket 81 is pivotally connected to the piston component 71 via a pivot 83 and partially extends into the sliding cavity 713. The maximum width of the portion of the bracket 81 extending into the sliding cavity 713 is less than the diameter of the sliding cavity 713. This design allows the bracket 81 to swing relative to the piston component 71. The cleaning block 82 has a concave arc surface on the side near the wheel 200 that matches the shape of the wheel 200's tread surface. The cleaning block 82 contacts the wheel 200's tread surface through this arc surface. The telescopic drive assembly 7 also includes a slider 75 slidably disposed within the sliding cavity 713 and a second elastic member 76 disposed between the slider 75 and the end face of the sliding cavity 713. Under the action of the second elastic member 76, the slider 75 abuts against the bracket 81 in a direction perpendicular to the axis of the pivot. At least one of the two sides of the bracket 81 that contact the slider 75 is an arc surface. Under the support of the slider 75, the bracket 81 will not swing due to gravity, vibration or other reasons. Only when the cleaning block 82 contacts the wheel 200 will it overcome the elastic force of the second elastic element 76 and cause the bracket 81 and the cleaning block 82 to swing, so as to compensate for the positional deviation between the wheel 200 and the cleaning block 82 and maintain good contact between the cleaning block 82 and the tread of the wheel 200.

[0052] like Figure 3 In the state shown, the receiving cavity 11 is opened at the top of the brake body 10, and is inclined relative to the horizontal plane in the second direction (i.e., the axial direction of the receiving cavity). The housing 6 and the receiving cavity 11 are coaxially arranged, and the angle between the axis of the two extending along the second direction and the horizontal plane is an acute angle on the side away from the wheel 200, and should be perpendicular to the tangent of the outer circle of the wheel 200. In this way, the cleaning block 82 driven by the telescopic drive assembly 7 moves along the axial direction of the housing 6 and can directly abut against the tread of the wheel 200.

[0053] The slider 75 includes a slider body 751 slidably disposed within a sliding cavity 713 and a positioning portion 752 protruding from the slider body 751 toward a direction away from the bracket 81. The second elastic element 76 may be a helical spring, and the positioning portion 752 extends into the helical spring to limit its position. The slider 75 may also include a first contact block 753 connected to the slider body 751 near the bracket 81. The bracket 81 is provided with a second contact block 811 that contacts the first contact block 753. The bracket 81 and the slider 75 are in contact through the first contact block 753 and the second contact block 811. The first contact block 753 and the second contact block 811 may be made of a relatively hard, wear-resistant material.

[0054] The brake caliper assembly 100 may further include a second fastener 13 connected to the brake body 10 and extending into the receiving cavity 11, and the second fastener 13 abuts against the housing 6 to fix the housing 6 to the brake body 10. Specifically, the second fastener 13 may include two second screws, each second screw including a second post with external threads and a second screw head connected to one end of the second post, the second post being threadedly connected to the brake body 10 and its end away from the second screw head extending into the receiving cavity 11 to abut against the housing 6, thereby fixing the housing 6 to the brake body 10. The brake caliper assembly 100 may further include a pad 14 disposed between the brake body 10 and the second screw head, the pad 14 preventing the second screw head from directly pressing on the brake body 10.

[0055] like Figure 8 As shown, the first hanger 41 has a positioning groove 411 recessed from the end of its inner wall away from the second hanger 42, and the first protrusion 621 has a positioning protrusion 65 protruding from its outer peripheral surface that cooperates with the positioning groove 411. The positioning protrusion 65 can prevent the first hanger 41 from disengaging from the first protrusion 621 on the first side in the second direction. The second hanger 42 on the second side in the second direction is also locked on the second protrusion 622 by the first fastener 9. In this way, the first hanger 41 and the second hanger 42 define the relative positions of the housing 6 and the braking body 10 in the second direction.

[0056] like Figure 9 As shown, both the first hanger 41 and the second hanger 42 include a sleeve portion 43 and an extension portion 44 extending from the sleeve portion 43 to both sides in the first direction. The sleeve portion 43 is used to sleeve the periphery of the extension portion 62. That is, the sleeve portion 43 of the first hanger 41 and the second hanger 42 are respectively sleeved on the periphery of the first extension portion 621 and the second extension portion 622. The extension portion 44 is provided with two connecting holes 45 spaced apart in the first direction. The connecting holes 45 facilitate the connection of the first hanger 41 and the second hanger 42 to the vehicle's bogie. That is, the entire brake caliper device 100 can be connected to the vehicle's bogie through a total of four connecting holes 45 on the first hanger 41 and the second hanger 42.

[0057] The drive unit 30 uses the air pressure supplied by an external air source as the power source for clamping by the clamp arm 20, and includes a pneumatic drive component 31. Other specific structures of the drive unit 30 can be found in existing technology and will not be described in detail here. Figure 10 and Figure 11 The second embodiment of the present invention is shown. The difference from the first embodiment is that in the second embodiment, the first channel 64 extends from the first end face 632 to the outer peripheral surface of the housing 6. The brake body 10 is provided with a second channel 12. One end of the second channel 12 is connected to the pneumatic drive member 31, and the other end extends to the inner wall of the receiving cavity 11 and is connected to the first channel 64. The above design allows the pneumatic drive member 31 to be connected to the piston cavity 63. In this way, the external air source can supply air to the piston cavity 63 and the pneumatic drive member 31 at the same time. While the pneumatic drive member 31 drives a pair of caliper arms 20 to clamp the wheel 200, the piston member 71 extends at the same time to drive the cleaning block 82 to clean the tread of the wheel 200. In this way, the piston member 71 and the pneumatic drive member 31 used to drive the caliper arms 20 do not need to be separately controlled by valves or other control components, and the control of the brake caliper device 100 is simpler.

[0058] Specifically, the brake caliper device 100 further includes two sealing rings 67 disposed between the fixing part 61 and the receiving cavity 11. The two sealing rings 67 are spaced apart, forming an intermediate cavity 68 between the fixing part 61 and the receiving cavity 11. The intermediate cavity 68 is annular, and both the first channel 64 and the second channel 12 communicate with the intermediate cavity 68. In other words, the first channel 64 and the second channel 12 are connected through the intermediate cavity 68. At least two first channels 64 are provided and distributed along the circumferential direction of the housing 6. In this embodiment, four first channels 64 are provided. In the second embodiment, the first screw 92 is threadedly connected to the housing 6, and there is no need for a connecting hole 91 inside.

[0059] In summary, the present invention provides a brake caliper device 100, which uses the housing 6 of the tread cleaning unit 50 as a connecting member to connect the brake body 10 and the hanger 40, so that the brake caliper device 100 can simultaneously have braking and tread cleaning functions, while also having a more compact structure.

[0060] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0061] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A brake caliper device, comprising a brake body, a pair of caliper arms disposed opposite to each other in a first direction and respectively mounted on both sides of the brake body, and a drive unit disposed within the brake body for driving the pair of caliper arms to clamp a wheel, the brake caliper device further comprising a tread cleaning unit and a hanger, characterized in that, The braking body has a receiving cavity that extends through the braking body in a second direction perpendicular to the first direction. The tread cleaning unit includes a housing, a telescopic drive assembly disposed in the housing, and a cleaning assembly connected to the telescopic drive assembly. The telescopic drive assembly is used to drive the cleaning assembly to move relative to the housing in the second direction. The housing includes a fixed part fixed in the receiving cavity and a protruding part extending out of the receiving cavity. The hanger is connected to the protruding part.

2. The brake caliper device according to claim 1, characterized in that, The housing has a piston chamber with an opening on a first side in a second direction and a first end face on a second side in a second direction. The telescopic drive assembly includes a piston slidably disposed in the piston chamber. The housing has a first channel extending from the first end face to the outer surface of the housing. The cleaning assembly is connected to the piston slid.

3. The brake caliper device according to claim 2, characterized in that, The protrusion includes a first protrusion and a second protrusion located on a first side and a second side in a second direction, respectively, and the hanger includes a first hanger and a second hanger respectively sleeved on the first protrusion and the second protrusion.

4. The brake caliper device according to claim 3, characterized in that, The second protrusion has an annular outer conical surface, and the second hanger has an annular inner conical surface that mates with the outer conical surface. The first channel extends from the first end face to the end face of the housing. The brake caliper device further includes a first fastener connected to the first channel and abutting against the second hanger. The first fastener has a connecting hole inside that communicates with the first channel and extends to its outer surface located outside the first channel.

5. The brake caliper device according to claim 2, characterized in that, The first channel extends from the first end face to the outer peripheral surface of the housing. The driving unit includes a pneumatic drive component. The braking body has a second channel. One end of the second channel is connected to the pneumatic drive component, and the other end extends through the inner wall of the receiving cavity to communicate with the first channel.

6. The brake caliper device according to claim 5, characterized in that, The outer diameter of the fixing part is smaller than the diameter of the receiving cavity. The brake caliper device also includes two sealing rings disposed between the fixing part and the receiving cavity. The two sealing rings are spaced apart and form an intermediate cavity between the fixing part and the receiving cavity. The first channel and the second channel are both connected to the intermediate cavity. At least two first channels are provided along the circumferential direction of the housing.

7. The brake caliper device according to claim 2, characterized in that, The piston component includes a piston body and a flange protruding from the outer periphery of the piston body near the first end face. The telescopic drive assembly also includes a ring fixed in the piston cavity and disposed opposite to the flange in a second direction, and a first elastic element disposed between the ring and the flange.

8. The brake caliper device according to claim 7, characterized in that, The piston component has a slider cavity. The cleaning assembly includes a bracket pivotally connected to the piston component via a rotating shaft and a cleaning block connected to the bracket. The bracket extends into the slider cavity, and the maximum width of the extended portion is less than the diameter of the slider cavity. The telescopic drive assembly also includes a slider slidably disposed in the slider cavity to support the bracket and a second elastic element disposed between the slider and the end face of the slider cavity. At least one of the two sides of the bracket that contact the slider is an arc surface.

9. The brake caliper device according to claim 3, characterized in that, Both the first hanger and the second hanger include a sleeve portion that is fitted around the periphery of the protrusion portion and an extension portion that extends from the sleeve portion to both sides in a first direction. The extension portion is provided with two connecting holes spaced apart in the first direction.

10. The brake caliper device according to claim 1, characterized in that, The brake caliper device also includes a second fastener connected to the brake body and extending into the receiving cavity to abut against the housing.

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