A brake wheel cylinder

Abstract

The present invention relates to a brake wheel cylinder, comprising a housing, a wedge, and a sleeve assembly. The sleeve assembly comprises a tappet, a sleeve, a screw, and a drive ring. A C-shaped spring and a winding spring are disposed between the tappet and the sleeve. Transmission balls are disposed on both sides of the wedge to cooperate with the tappet to achieve transmission. Inclined surfaces are formed on both sides of the wedge to cooperate with the transmission balls. Inclined surfaces are also formed on the side of the tappet to cooperate with the transmission balls. A ball retaining member is also disposed on the wedge to support a pair of transmission balls. The advantages of the present invention are that transmission balls are used as intermediate transmission between the wedge and the tappet, the transmission balls themselves can freely rotate 360 ​​degrees in any direction, and point-to-surface or line-to-surface contact can be achieved between the transmission balls and the wedge and tappet, thereby greatly reducing the contact area, avoiding the occurrence of jamming, and ensuring stable transmission.

Description

Technical Field

[0001] The present invention relates to a brake, in particular to a brake wheel cylinder. Background Art

[0002] As a key part of automobile safety performance, automobile brakes have always been the focus and research of domestic and foreign experts and scholars. The quality of their braking performance and the level of their braking efficiency will directly affect the safety of transportation, which are closely related to the friction of the brakes. The friction characteristics of the brakes will directly affect the overall braking performance of the automobile brake system.

[0003] A typical brake consists of a base plate, brake drum, brake shoes, wheel cylinder (brake slave cylinder), return spring, and locating pins. The base plate is mounted in a fixed position on the axle and is stationary. It is equipped with brake shoes, wheel cylinders, return springs, and locating pins to withstand the rotational torque during braking. Each drum has a pair of brake shoes with friction linings. The brake drum is mounted on the wheel hub and rotates with the wheel. It is made of heavy cast iron and is shaped like a drum. Drum brakes stop the tire from rotating by transmitting hydraulic pressure from the master cylinder to the wheel cylinder to press the brake shoes against the brake drum. The drum rotates with the tire. When the hydraulic pressure on the wheel cylinder disappears, the force of the return spring pushes the brake shoes off the inner surface of the brake drum and returns to its original position.

[0004] The wheel cylinder structure in the brake mainly includes an outer shell, a space serving as a wedge-shaped piece accommodating portion is formed in the center of the outer shell, a plug-in wedge-shaped piece is provided in the wedge-shaped piece accommodating portion, the wedge-shaped piece is connected to the brake air chamber, a pair of barrels are provided on both sides of the wedge-shaped piece accommodating portion, a sleeve assembly is installed in the barrel, the sleeve assembly includes a push rod, a sleeve, a screw, and a drive ring, a C-shaped spring and a winding spring are provided between the push rod and the sleeve, the screw is placed in the sleeve, one side of the screw extends out of the sleeve and is connected to an adjustment dial portion and a clip, rollers that cooperate with the push rod are respectively provided on both sides of the wedge, the wedge has two inclined surfaces that cooperate with the rollers, and the wedge is also provided with a roller retaining member that supports a pair of rollers. For example, a drum brake device mentioned in patent CN107002791B and a wheel cylinder for a wedge-type brake mentioned in patent CN114962494A both adopt the above-mentioned structure.

[0005] In the aforementioned wheel cylinder structure of a brake, during transmission, the action of the wedge member pushes the roller, which in turn pushes the tappet. During this process, the roller, acting as an intermediate transmission, rotates during transmission, utilizing the cooperation of the wedge member and the roller to achieve transmission. Utilizing the rolling action of the roller can significantly reduce the occurrence of jamming, thereby ensuring transmission stability. However, as a key component in a vehicle, its performance must be as excellent as possible. Although the aforementioned structure utilizes the rolling action of the roller to achieve cooperative transmission between the wedge member and the tappet, it still has certain drawbacks: the roller is mounted on a roller retaining member, and during transmission, the roller moves horizontally along the roller retaining member. This creates surface-to-surface contact between the roller, the wedge member, and the tappet. Consequently, the roller may jam during movement, resulting in unstable transmission. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a brake wheel cylinder with stable transmission and avoid the jamming phenomenon.

[0007] To solve the above technical problems, the technical solution of the present invention is as follows: a brake wheel cylinder, comprising a housing, a space serving as a wedge-shaped member accommodation portion formed in the center of the housing, a plug-in wedge-shaped member disposed in the wedge-shaped member accommodation portion, the wedge-shaped member being connected to a brake air chamber, a pair of barrel portions disposed on either side of the wedge-shaped member accommodation portion, a sleeve assembly mounted in the barrel portion, the sleeve assembly comprising a tappet, a sleeve, a screw, and a drive ring, a C-shaped spring and a winding spring disposed between the tappet and the sleeve, the screw disposed in the sleeve, one side of the screw extending out of the sleeve and connected to an adjustment dial portion and a clip, the innovation of the present invention being:

[0008] Transmission balls that cooperate with the push rod to realize transmission are respectively provided on both sides of the wedge-shaped piece. Inclined surfaces that cooperate with the transmission balls are respectively opened on both sides of the wedge-shaped piece. Inclined surfaces that cooperate with the transmission balls are also opened on the side of the push rod. A ball retaining component that supports a pair of transmission balls is also provided on the wedge-shaped piece.

[0009] Furthermore, first grooves are respectively formed on both sides of the wedge-shaped member to accommodate the installation and vertical movement of the transmission ball. The cross-section of the first groove is arc-shaped. The depth of the first groove gradually increases from bottom to top, and the width of the first groove gradually increases from bottom to top. The first groove is the inclined surface on the wedge-shaped member that cooperates with the transmission ball.

[0010] A second groove is formed on the side surface of the tappet on the side close to the wedge-shaped piece, into which the ball retaining member and the transmission ball extend and move up and down. The second groove is composed of a middle section located in the middle position and side sections located on both sides of the middle section. The cross-section of the middle section is arc-shaped, and the side sections are planes. The depth of the middle section is greater than that of the side sections. The depth of the middle section gradually decreases from bottom to top, and the depth of the side sections gradually decreases from bottom to top. The middle section is the inclined surface on the tappet that cooperates with the transmission ball.

[0011] The ball holding component includes an upper component, a lower component and an intermediate component, wherein the upper component is a U-shaped plate formed by connecting four side plates together, the upper part of the wedge-shaped component is placed in the upper component and moves up and down along the upper component, and a circular through hole is opened in one of the pair of side plates to accommodate the transmission ball to extend out, one section of the transmission ball is placed in the first groove of the wedge-shaped component, and the other section extends out from the circular through hole on the side plate, the lower component is a horizontally arranged circular bottom plate, and a through hole is opened in the middle position of the circular bottom plate to accommodate the wedge-shaped component to pass through, the intermediate component includes a pair of vertically arranged vertical plates, the bottom ends of the two vertical plates are connected to the two sides of the circular bottom plate, and the top ends of the two vertical plates are respectively connected to the two side plates, so that the upper component, the lower component and the intermediate component are connected together to form an integral ball holding component.

[0012] Furthermore, the four side panels constituting the upper member are defined as the first side panel, the second side panel, the third side panel, and the fourth side panel, and the two vertical panels are defined as the first vertical panel and the second vertical panel;

[0013] The first side panel and the second side panel are formed by bending the same flat plate, and the third side panel and the fourth side panel are formed by bending the same flat plate. Circular through holes for accommodating the transmission ball to extend out are opened on the second side panel and the fourth side panel. One side of the second side panel is connected and fixed to the third side panel, and one side of the fourth side panel is connected and fixed to the first side panel, so that the first side panel, the second side panel, the third side panel, and the fourth side panel are connected to form a complete upper component.

[0014] The bottom end of the first side panel is integrally connected to the first vertical panel, and the first side panel and the first vertical panel are integrally formed from the same flat plate; the bottom end of the third side panel is integrally connected to the second vertical panel, and the third side panel and the second vertical panel are integrally formed from the same flat plate;

[0015] The first vertical plate, the second vertical plate and the circular bottom plate are formed by bending the same flat plate.

[0016] Furthermore, the third side panel has two first positioning holes distributed up and down on the side close to the second side panel, and a first positioning protrusion embedded in the first positioning hole is provided on the second side panel. The first side panel has two second positioning holes distributed up and down on the side close to the fourth side panel, and a second positioning protrusion embedded in the second positioning hole is provided on the fourth side panel.

[0017] Furthermore, a first process hole is formed in the middle of the bend between the first side panel and the second side panel, and a second process hole is formed in the middle of the bend between the third side panel and the fourth side panel.

[0018] Furthermore, a limit plate is provided on the upper and lower sides of the circular through hole on the side plate, and the transmission ball is limited by the cooperation of the upper and lower limit plates to extend out of the side plate, and the limit plate is arc-shaped.

[0019] The advantages of the present invention are: in the present invention, by improving the traditional transmission parts, a transmission ball is used as the intermediate transmission between the wedge-shaped part and the push rod. The transmission ball itself can rotate freely in any direction of 360°. At the same time, the transmission ball and the wedge-shaped part and the push rod can achieve point-to-surface or line-to-surface contact, which greatly reduces the contact area, avoids the occurrence of jamming, and ensures the stability of the transmission.

[0020] For the structure of the ball retaining component formed by connecting three parts: an upper component, a lower component and an intermediate component, the first side panel and the second side panel are bent from the same flat plate, the third side panel and the fourth side panel are bent from the same flat plate, the first side panel and the first vertical panel are integrally formed from the same flat plate, the third side panel and the second vertical panel are integrally formed from the same flat plate, and the first vertical panel, the second vertical panel and the circular bottom panel are bent from the same flat plate. By adopting the above design, the entire ball retaining component can be processed from the same flat plate, which facilitates processing.

[0021] The design of the first positioning hole, the first positioning protrusion, the second positioning hole, and the second positioning protrusion is to play a role in positioning the relative position between the second side panel and the third side panel, and the relative position between the fourth side panel and the first side panel when the second side panel is fixed to the third side panel or the fourth side panel is fixed to the first side panel, so as to ensure the forming of the upper component structure.

[0022] The design of the first process hole and the second process hole is to enable the first side panel and the second side panel to be bent more smoothly, or the third side panel and the fourth side panel to be bent more smoothly during the bending process, thereby avoiding the phenomenon of pulling the material and facilitating the bending process.

[0023] The two limit plates designed on the side panels use two arc-shaped limit plates distributed up and down to limit the section of the transmission ball extending out of the side panel, ensuring the position of the transmission ball and avoiding position deviation of the transmission ball and affecting the overall transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 Schematic diagram of the brake wheel cylinder of the present invention.

[0026] Figure 2 Schematic diagram of the interior of the brake wheel cylinder in the present invention.

[0027] Figure 3 Schematic diagram of the transmission cooperation between the wedge-shaped member and the push block in the present invention.

[0028] Figure 4 Schematic diagram of the cooperation between the wedge-shaped member and the ball retainer in the present invention.

[0029] Figure 5 Schematic diagram of the wedge member in the present invention.

[0030] Figure 6 Schematic diagram of the ball retainer of the present invention.

[0031] Figure 7 Schematic diagram of the supporting block in the present invention. DETAILED DESCRIPTION

[0032] The following embodiments may enable those skilled in the art to more fully understand the present invention, but the present invention is not limited to the scope of the embodiments.

[0033] like Figure 1 、 Figure 2 A brake wheel cylinder is shown, and the brake wheel cylinder includes an outer shell 1, and a space serving as a wedge-shaped piece accommodating portion is formed in the center of the outer shell 1. A plug-in wedge-shaped piece 2 is provided in the wedge-shaped piece accommodating portion, and the wedge-shaped piece 2 is connected to the brake air chamber. A pair of barrels are provided on both sides of the wedge-shaped piece accommodating portion, and a sleeve assembly is installed in the barrel. The sleeve assembly includes a push rod 3, a sleeve 4, a screw, and a drive ring 6. A C-shaped spring and a winding spring are provided between the push rod 3 and the sleeve 4. The screw is placed in the sleeve 4 and is threadedly engaged with the sleeve 4. One side of the screw 5 extends out of the sleeve 4 and is connected to an adjusting dial portion and a clip 9. The specific matching form and braking principle of the wedge-shaped piece 2, push rod 3, sleeve 4, screw, drive ring 6 and other components of the wheel cylinder are the same as the matching form and braking principle of the various components in patent CN107002791B, and this part will not be described in detail in this embodiment.

[0034] like Figure 3 、 Figure 4 As can be seen from the schematic diagram shown, transmission balls 11 are respectively provided on both sides of the wedge 2 to cooperate with the push rod 3 to realize transmission. The transmission ball 11 is a spherical structure, and inclined surfaces cooperating with the transmission ball 11 are respectively opened on both sides of the wedge 3. An inclined surface cooperating with the transmission ball 11 is also opened on the side of the push rod 3. A ball retaining component supporting a pair of transmission balls 11 is also provided on the wedge 2.

[0035] like Figure 5 As can be seen from the schematic diagram shown, first grooves 21 are respectively provided on both sides of the wedge-shaped member 2 for accommodating the transmission ball 11 to be installed and move up and down. The cross-section of the first groove 21 is arc-shaped, and the inner wall of the first groove 21 fits the outer wall of the transmission ball 11. The depth of the first groove 21 gradually increases from bottom to top, and the width of the first groove 21 gradually increases from bottom to top. The first groove 21 is the inclined surface on the wedge-shaped member 2 that cooperates with the transmission ball 11.

[0036] like Figure 7 As can be seen from the schematic diagram shown, a second groove is provided on the side surface of the push rod 3 close to the wedge-shaped member 2, into which the ball retaining member and the transmission ball 11 extend and move up and down. The second groove is composed of a middle section 31 located in the middle position and side sections 32 located on both sides of the middle section 31. The cross-section of the middle section 31 is arc-shaped, the side sections 32 are planes, and the depth of the middle section 31 is greater than the depth of the side sections 32. The depth of the middle section 31 gradually decreases from bottom to top, and the depth of the side sections 32 gradually decreases from bottom to top. The middle section 31 is the inclined surface on the push rod 3 that cooperates with the transmission ball 11.

[0037] like Figure 6 As can be seen from the schematic diagram shown, the ball retaining component includes an upper component, a lower component and an intermediate component, wherein the upper component is a U-shaped plate formed by connecting four side panels together, the upper part of the wedge 2 is placed in the upper component, and moves up and down along the upper component, a circular through hole 103 is opened on one of the pair of side panels to accommodate the transmission ball to extend out, one section of the transmission ball 11 is placed in the first groove 21 of the wedge 2, and the other section of the transmission ball 11 extends out from the circular through hole on the side panel, the lower component is a horizontally arranged circular bottom plate 18, and a through hole 19 is opened in the middle position of the circular bottom plate 18 to accommodate the wedge 2 to pass through, the intermediate component includes a pair of vertically arranged vertical plates, the bottom ends of the two vertical plates are connected to the two sides of the circular bottom plate 18, and the top ends of the two vertical plates are respectively connected to the two side panels, so that the upper component, the lower component and the intermediate component are connected together to form an integral ball retaining component.

[0038] The four side panels constituting the upper component are defined as the first side panel 12, the second side panel 13, the third side panel 14, and the fourth side panel 15, respectively. The two vertical panels are defined as the first vertical panel 16 and the second vertical panel 17, respectively. The first side panel 12, the second side panel 13, the third side panel 14, the fourth side panel 15, the first vertical panel 16, and the second vertical panel 17 are all rectangular panels.

[0039] The first side panel 12 and the second side panel 13 are formed by bending the same flat plate, and the third side panel 14 and the fourth side panel 15 are formed by bending the same flat plate. A first process hole is provided in the middle of the bend of the first side panel 12 and the second side panel 13, and the first process hole is a rectangular hole. A second process hole 104 is provided in the middle of the bend of the third side panel 14 and the fourth side panel 15, and the second process hole 104 is a rectangular hole. The design of the first process hole 104 is to enable the first side panel 12 and the second side panel 13 to be bent more smoothly, or the third side panel 14 and the fourth side panel 15 to be bent more smoothly during the bending process, to avoid undesirable phenomena such as pulling of the material during the bending process, to facilitate the bending process and to ensure that the bending process can be completed in one go without the need for subsequent secondary trimming and other processing.

[0040] A circular through hole 103 for accommodating the transmission ball 11 to extend is provided on the second side plate 13 and the fourth side plate 15. One side of the second side plate 13 is welded and fixed to the third side plate 14, and one side of the fourth side plate 15 is welded and fixed to the first side plate 12, so that the first side plate 12, the second side plate 13, the third side plate 14, and the fourth side plate 15 are connected to form a complete upper component.

[0041] Two first positioning holes distributed up and down are provided on the side of the third side panel 14 close to the second side panel 12. The first positioning holes are rectangular holes. Two first positioning protrusions 102 distributed up and down and embedded in the two first positioning holes are provided on the second side panel 12. The first positioning protrusions 102 are rectangular protrusions. Two second positioning holes distributed up and down are provided on the side of the first side panel 12 close to the fourth side panel 15. The second positioning holes are rectangular holes. The heights of the two second positioning holes are the same as the heights of the two first positioning holes, and the sizes of the second positioning holes are also the same as the sizes of the first positioning holes. Two second positioning protrusions distributed up and down and embedded in the two second positioning holes are provided on the fourth side panel 15. The second positioning protrusions are also rectangular protrusions. The design of the first positioning hole, the first positioning protrusion 102, the second positioning hole, and the second positioning protrusion is to ensure that when the second side panel 13 is fixed to the third side panel 14 or the fourth side panel 15 is fixed to the first side panel 11, the first positioning hole and the first positioning protrusion 102 can be used to position the relative position between the second side panel 13 and the third side panel 14, or the second positioning hole and the second positioning protrusion can be used to position the relative position of the fourth side panel 15 and the first side panel 12, thereby ensuring the stability of the connection position of the first side panel 12, the second side panel 13, the third side panel 14, and the fourth side panel 15, and thereby ensuring the stable molding of the upper component structure.

[0042] A limiting plate 101 is further provided on the upper and lower sides of the circular through hole 103 on the second side plate 13 and the fourth side plate 15. The bottom surface of the limiting plate 101 on the upper side is an arc-shaped surface that coincides with the outer contour of the circular through hole 103, and the top surface of the limiting plate 101 on the lower side is an arc-shaped surface that coincides with the outer contour of the circular through hole 103. The two arc-shaped surfaces of the upper and lower limiting plates 101 cooperate with each other to limit a section of the transmission ball 11 extending out of the second side plate 13 or the fourth side plate 15, thereby ensuring that the transmission ball 11 can maintain horizontal movement and avoiding the transmission ball 11 from moving up and down. The limiting plate 101 itself is also arc-shaped. The two limit plates 101 designed on the second side plate 13 and the fourth side plate 15 use two arc-shaped limit plates 101 distributed up and down to limit the transmission ball 11 extending out of the second side plate 13 or the fourth side plate 15, thereby ensuring the position of the transmission ball 11 and avoiding position deviation of the transmission ball 11 and affecting the overall transmission.

[0043] The bottom end of the first side panel 12 is integrally connected to the first vertical panel 16 , and the first side panel 12 and the first vertical panel 16 are integrally formed from the same flat plate. The bottom end of the third side panel 14 is integrally connected to the second vertical panel 17 , and the third side panel 14 and the second vertical panel 17 are integrally formed from the same flat plate.

[0044] The first vertical plate 16 , the second vertical plate 17 and the circular bottom plate 18 are formed by bending a same flat plate.

[0045] Regarding the structure of the ball retaining component formed by connecting three parts: an upper component, a lower component and an intermediate component, the first side panel 12 and the second side panel 13 are formed by bending the same flat plate, the third side panel 14 and the fourth side panel 15 are formed by bending the same flat plate, the first side panel 16 and the first vertical panel 12 are integrally formed from the same flat plate, the third side panel 13 and the second vertical panel 17 are integrally formed from the same flat plate, and the first vertical panel 16, the second vertical panel 17 and the circular bottom panel 18 are bent from the same flat plate. By adopting the above design, the entire ball retaining component can be processed from the same flat plate, which facilitates processing.

[0046] During processing, a flat plate is taken and punched to form the first side plate 12, the second side plate 13, the third side plate 14, the fourth side plate 15, the first vertical plate 16, the second vertical plate 17, and the circular bottom plate 18. The circular bottom plate 18 is located in the middle, the first vertical plate 16 and the second vertical plate 17 are located on both sides of the circular bottom plate 18, the first side plate 12 and the third side plate 14 are located on both sides of the first vertical plate 16 and the second vertical plate 17, the second side plate 13 is located next to the first side plate 12, and the fourth side plate 15 is located next to the third side plate 14. The long axis direction of the flat plate is defined as the first direction, and the width direction is defined as the second direction. Along the first direction, there are the first side panel 12, the first vertical panel 16, the circular bottom panel 18, the second vertical panel 17, and the third side panel 14. The second side panel 13 and the fourth side panel 15 are located on the side of the second direction, so that the entire flat plate forms a Z-shaped panel. Then, the first vertical panel 16 and the second vertical panel 17 are bent along the circular bottom panel 18 to make the flat plate become a U-shaped structure. The second side panel 13 is then bent along the first side panel 12, and the fourth side panel 15 is bent along the third side panel 14. Finally, the second side panel 13 is welded and fixed to the third side panel 14, and the fourth side panel 15 is welded and fixed to the first side panel 12, thereby forming the required ball retaining component.

[0047] The brake wheel cylinder in the present invention improves the transmission structure between the wedge and the push rod of the traditional structure, and adopts a transmission ball 11 as the intermediate transmission between the wedge 2 and the push rod 3. The transmission ball 11 itself can rotate freely in any direction of 360°. This design can avoid the phenomenon of jamming. At the same time, the transmission ball 11 and the wedge 2 and the push rod 3 can achieve point-to-surface or line-to-surface contact. Such a design can greatly reduce the contact area between the transmission ball 11 and the wedge 2 or the contact area between the transmission ball 11 and the push rod 3. As the contact area decreases, combined with the arbitrarily rotating transmission ball 11, the transmission can be carried out with the roller, which can more effectively avoid the occurrence of jamming and ensure the stability of the transmission.

[0048] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wheel brake cylinder, comprising a housing, a space serving as a wedge-shaped member receiving portion formed in the center of the housing, a wedge-shaped member disposed within the wedge-shaped member receiving portion for plugging and unplugging, the wedge-shaped member being connected to a brake air chamber, a pair of barrels disposed on either side of the wedge-shaped member receiving portion, a sleeve assembly mounted within the barrels, the sleeve assembly comprising a tappet, a sleeve, a screw, and a drive ring, a C-shaped spring and a wrap spring disposed between the tappet and the sleeve, the screw disposed within the sleeve, one side of the screw extending outside the sleeve and connected to an adjustment dial portion and a clip, the cylinder being characterized in that: Transmission balls are provided on both sides of the wedge-shaped member to cooperate with the tappet to realize transmission. Inclined surfaces for cooperating with the transmission balls are respectively provided on both sides of the wedge-shaped member. Inclined surfaces for cooperating with the transmission balls are also provided on the side of the tappet. A ball retaining member for supporting a pair of transmission balls is also provided on the wedge-shaped member. The wedge-shaped member has first grooves on both sides for accommodating the transmission ball to be installed and move up and down. The cross section of the first groove is arc-shaped. The depth of the first groove gradually increases from bottom to top. The width of the first groove gradually increases from bottom to top. The first groove is the inclined surface on the wedge-shaped member that cooperates with the transmission ball. A second groove is formed on the side surface of the tappet on the side close to the wedge-shaped piece, into which the ball retaining member and the transmission ball extend and move up and down. The second groove is composed of a middle section located in the middle position and side sections located on both sides of the middle section. The cross-section of the middle section is arc-shaped, and the side sections are planes. The depth of the middle section is greater than that of the side sections. The depth of the middle section gradually decreases from bottom to top, and the depth of the side sections gradually decreases from bottom to top. The middle section is the inclined surface on the tappet that cooperates with the transmission ball. The ball holding component includes an upper component, a lower component and an intermediate component, wherein the upper component is a square-shaped plate formed by connecting four side plates.

2. The wheel brake cylinder according to claim 1, characterized in that: The upper part of the wedge-shaped piece is placed in the upper component and moves up and down along the upper component. A circular through hole is provided on one of the pair of side panels to accommodate the transmission ball. One section of the transmission ball is placed in the first groove of the wedge-shaped piece, and the other section extends out of the circular through hole on the side panel. The lower component is a horizontally arranged circular bottom plate. A through hole is provided in the middle of the circular bottom plate to accommodate the wedge-shaped piece. The middle component includes a pair of vertically arranged vertical plates. The bottom ends of the two vertical plates are connected to both sides of the circular bottom plate, and the top ends of the two vertical plates are respectively connected to the two side panels, so that the upper component, the lower component, and the middle component are connected together to form an integral ball retaining component.

3. The wheel brake cylinder according to claim 2, characterized in that: The four side panels constituting the upper member are defined as the first side panel, the second side panel, the third side panel, and the fourth side panel, and the two vertical panels are defined as the first vertical panel and the second vertical panel; The first side panel and the second side panel are formed by bending the same flat plate, and the third side panel and the fourth side panel are formed by bending the same flat plate. Circular through holes for accommodating the transmission ball to extend out are opened on the second side panel and the fourth side panel. One side of the second side panel is connected and fixed to the third side panel, and one side of the fourth side panel is connected and fixed to the first side panel, so that the first side panel, the second side panel, the third side panel, and the fourth side panel are connected to form a complete upper component. The bottom end of the first side panel is integrally connected to the first vertical panel, and the first side panel and the first vertical panel are integrally formed from the same flat plate; the bottom end of the third side panel is integrally connected to the second vertical panel, and the third side panel and the second vertical panel are integrally formed from the same flat plate; The first vertical plate, the second vertical plate and the circular bottom plate are formed by bending the same flat plate.

4. The wheel brake cylinder according to claim 3, characterized in that: The third side panel is provided with two first positioning holes distributed up and down on one side close to the second side panel, and a first positioning protrusion embedded in the first positioning hole is provided on the second side panel. The first side panel is provided with two second positioning holes distributed up and down on one side close to the fourth side panel, and a second positioning protrusion embedded in the second positioning hole is provided on the fourth side panel.

5. The wheel brake cylinder according to claim 3, characterized in that: A first process hole is further provided at the middle of the bend between the first side panel and the second side panel, and a second process hole is further provided at the middle of the bend between the third side panel and the fourth side panel.

6. The wheel brake cylinder according to claim 2 or 3, characterized in that: A limiting plate is further provided on the upper and lower sides of the circular through hole on the side plate, and the transmission ball is limited by the cooperation of the upper and lower limiting plates to extend out of the side plate, and the limiting plate is arc-shaped.

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