New drum brake with double cable and rotating arm mechanism

Abstract

The invention discloses a new drum brake with a double-cable rotating arm mechanism. The rotating arm mechanism assembly on the brake base plate is connected to the cable guide mechanism, the cable guide mechanism includes a cable guide wheel and a guide wheel shaft, one end of the cable I passes through the cable bracket and is clamped in the slot of the U-shaped bending part of the brake arm, the other end of the cable I passes through the cable guide wheel and is clamped in the slot end, the cable spring is installed in the cable I and the cable bracket slot, one end of the cable II passes through the cable guide wheel and is clamped in the slot end, and the other end is connected to the rotating arm; the rotating arm is divided into a straight section and a forked section, the rotating arm bracket is installed on the back of the brake base plate, the rotating arm forked section passes through the rotating arm cover and the rotating arm bracket, and the straight section is connected to the handbrake cable. The invention is suitable for different parking strokes and parking forces of the whole vehicle, has good applicability and is easy to adjust; the movement process only has the rotation of the cable guide wheel and the rotating arm pin, the compression and return movement of the cable spring, the parts are less worn, the movement is smoother, the abnormal noise is smaller, and the transmission efficiency is higher.

Description

Technical Field

[0001] The invention relates to a parking brake with a hand brake, or a drum brake integrating parking brake and driving brake, in particular to a drum brake with high requirements on parking noise. Background Art

[0002] The parking brake of the drum brake assembly is widely used in various types of vehicles. Conventional vehicles are generally powered by gasoline or diesel, which makes a lot of noise and provides poor comfort. With the application of electronic power in vehicles, customers have higher and higher requirements for vehicle comfort. While improving the noise during driving braking, it is also necessary to minimize the scratching and abnormal noise of the cable and other components when parking.

[0003] The cable connection parts inside a conventional drum brake are the cable core and the cable spring. The guide inside the brake is a cable guide plate or a cable bracket. The cable core runs through the entire cable, and is wrapped with a rubber sleeve on the outside. The head is riveted with a hexagonal or square head joint and installed on the side of the bending groove of the brake arm. The cable spring is sleeved on the outside of the cable core and installed between the brake arm and the brake base plate through the cable guide structure. When the handbrake is pulled, the arm rotates, compressing the cable spring, releasing the handbrake, and the spring returns to its original position. If the cable guide structure and the cable spring are not in smooth contact or stuck, it will cause scratching noise, and even wear and damage the guide, which will cause the cable travel to become longer or the brake to fail. Summary of the invention

[0004] In order to solve the problem in the prior art that the parking cable of the drum brake needs to be bent and wrapped from the drum brake end to the chassis fixed end, thereby reducing efficiency, and to solve the problem in the prior art that the drum brake cable guide structure and the cable spring have uneven contact or jamming, which will cause scraping noise, and even wear and damage the guide part, thereby causing a longer cable stroke or braking failure, the purpose of the present invention is to propose a new drum brake with a double cable belt rotating arm mechanism.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] The drum brake of the present invention comprises a brake base plate and a cable guide mechanism, wherein the cable guide mechanism is arranged on the front of the brake base plate, the cable guide mechanism comprises a cable, a cable spring and a brake arm, the upper end of the brake arm is hingedly mounted on one side of the upper part of the brake base plate, the drum brake also comprises a swivel arm mechanism assembly, the swivel arm mechanism assembly is arranged on the back of the brake base plate and connected to the cable guide mechanism, the cable guide mechanism also comprises a cable guide wheel and a guide wheel shaft, the cable is divided into a cable I and a cable II; the brake arm is mounted on one side of the lower part of the brake base plate, and a U-shaped bending portion is provided at the bottom of the brake arm; the guide wheel shaft is fixedly pressed on the other side of the lower part of the brake base plate, the cable guide wheel is sleeved on the guide wheel shaft, and two cables are provided on both sides of the cable guide wheel. An arc-shaped guide groove is formed, and the two arc-shaped guide grooves are respectively a first arc-shaped guide groove close to the brake arm and a second arc-shaped guide groove far away from the brake arm; a wire bracket is welded on the brake bottom plate, and one end of wire I passes through the wire bracket and is installed in the slot formed by the U-shaped bending part of the brake arm, and the other end of wire I passes through the first arc-shaped guide groove of the wire guide wheel and is clamped in the slot port through the cylindrical joint at the end, and the wire spring set compresses the wire I between the brake arm and the wire bracket, and the two ends of the wire spring are respectively connected to the U-shaped bending part of the brake arm and the wire bracket slot; one end of wire II passes through the second arc-shaped guide groove of the wire guide wheel and is clamped in the slot port through the cylindrical joint at the end, and the other end of wire II is connected to the swing arm of the swing arm mechanism assembly.

[0007] The swing arm mechanism assembly includes a swing arm, a swing arm bracket, a swing arm tensioning spring, a swing arm pin, a clamping ring and a swing arm cover; the swing arm is T-shaped, divided into a straight section and a forked section connected in the middle of the straight section, a swing arm pin hole for the swing arm pin to be installed is provided in the middle of the forked section of the swing arm, a through hole connected to the handbrake cable is provided at the upper end of the straight section of the swing arm, and a through hole is provided at the lower end of the straight section of the swing arm; the swing arm bracket is installed on the back of the brake base plate, and a swing arm cover is installed outside the swing arm bracket, and rectangular through grooves are provided in the middle of the swing arm bracket and the swing arm cover, and the end of the forked section of the swing arm passes through the rectangular through grooves of the swing arm cover and the swing arm bracket, and then passes through the through groove on the brake base plate and is connected to the other end of the cable II of the cable guide mechanism; raised blocks are provided on both sides of the rectangular through groove of the swing arm bracket, and the raised blocks on both sides are processed with through holes for the swing arm pin to pass through, and the swing arm pin holes of the forked section of the swing arm are located between the through holes of the raised blocks on both sides and are coaxial The cam is aligned, and the swivel arm pin passes through the swivel arm pin hole of the swivel arm fork section and the through holes of the raised blocks on both sides and is locked by the clamping retaining ring, so that the swivel arm and the swivel arm bracket are hingedly installed; a fixed bracket is fixed on the back of the brake base plate, and a U-shaped groove for the swivel arm to pass through is processed in the middle of the fixed bracket to form two support arms, and through holes are opened in the two support arms of the fixed bracket; the middle part of the straight section of the swivel arm is arranged in the U-shaped groove of the fixed bracket, and the upper end of the swivel arm tensioning spring is hooked on the through hole of the support arm on one side of the fixed bracket, and the lower end of the swivel arm tensioning spring is hooked on the through hole at the lower end of the straight end of the swivel arm; the swivel arm is also processed with a bending lug near the end at the upper end of the straight section, and a threaded hole is processed on the bending lug, and a long bolt is installed at the threaded hole, and the threaded end of the long bolt passes through the threaded hole of the bending lug of the swivel arm and is fixedly connected to the screw hole of the brake base plate, and a nut is set on the long bolt between the bending lug and the nut end of the long bolt.

[0008] A square hole is arranged at the other end of the pull wire II, and a hook head for hanging the pull wire II of the pull wire guide mechanism is processed at the end of the bifurcated section of the rotating arm, and the square hole is hung on the hook head after passing through the through groove of the brake bottom plate at the end of the bifurcated section of the rotating arm.

[0009] The end surface of the swing arm bracket facing the brake base plate of the drum brake is provided with a threaded hole for bolt fixing. The bolt passes through the brake base plate of the drum brake and is connected to the threaded hole, thereby fixing the swing arm bracket to the brake base plate of the drum brake.

[0010] The rotating arm mechanism assembly is fastened to the side of the brake base plate close to the vehicle suspension.

[0011] The wire drawing guide wheel is fixedly mounted on the guide wheel shaft through a saddle-shaped washer and a clamping retaining ring.

[0012] The position where the guide wheel shaft and the brake base plate are pressed together is processed with straight knurling and is pressed into the mounting hole of the brake base plate.

[0013] The contact surface between the wire support and the wire spring is processed with a bend, which is used for limiting the wire spring and the wire I.

[0014] The joint at one end of the pull wire I connected to the slot of the U-shaped bending part of the brake pull arm is a riveted hexagonal column head, square column head or cylindrical head consistent with the direction of the pull wire core wire, and the joint at the other end connected to the pull wire guide wheel is a cylindrical head arranged axially perpendicular to the direction of the pull wire core wire.

[0015] The connector at one end of the cable II connected to the cable guide wheel is a cylindrical head arranged axially perpendicular to the cable core wire direction, and the connector at the other end is flattened and processed to form a square hole for the rotating arm hook to pass through.

[0016] The wire guide mechanism of the present invention is respectively composed of a wire guide wheel, a guide wheel shaft, a wire bracket, a wire I, a wire II and a wire spring that cooperate with each other. During the entire movement process, only the wire guide wheel rotates, and the wire spring only performs compression-return movement, so that the parking mechanism has less wear, smoother movement, higher transmission efficiency, improved parking noise, and avoids uneven parking caused by excessive wear or jamming of the wire spring and the guide part, and avoids problems such as excessive wire travel or even brake failure caused by wear and damage of the guide part.

[0017] The cable guide mechanism of the present invention only has the rotation of the cable guide wheel during the parking movement, and the cable spring only performs compression-return movement, thereby avoiding problems such as uneven parking caused by excessive wear or jamming of the cable spring and the guide part, and excessive cable travel or even brake failure caused by wear and damage of the guide part. The system has less wear, smoother movement, higher transmission efficiency, and improved abnormal noise during parking.

[0018] The installation position and angle of the swing arm mechanism assembly of the present invention on the brake base plate can be adjusted according to the structural requirements of the vehicle suspension and parking mechanism. At the same time, the hook head position, the swing arm pin hole position and the end hole position of the swing arm can be adjusted according to different wire pulling strokes and slope holding force requirements, thereby forming different lever ratios to achieve different parking performance requirements for the entire vehicle.

[0019] Beneficial effects of the present invention:

[0020] The length of each cable, the position of the cable bracket, the installation position of the swing arm and the installation dimensions of the swing arm of the parking mechanism assembly of the present invention can be adjusted. Compared with the conventional drum brake which has only one brake cable, the cable can only be wound out of the brake from a single straight line and connected to the chassis parts in a curved manner, the new swing arm mechanism assembly can adjust the installation position and angle of the swing arm mechanism on the brake base plate according to the structural requirements of the vehicle suspension and the parking mechanism, has good applicability and small winding loss, and because the position of the hook head of the swing arm, the position of the pin hole of the swing arm and the position of the end hole are adjusted, different levers can be formed The rod ratio can change the cable stroke and the slope holding force. When the vehicle requirements change, adjustments can be made faster and more conveniently, with a short cycle, cost savings, and prevention of long cycles and mold waste. When the vehicle is parked, the entire movement process only involves the rotation of the cable guide wheel and the swing arm pin, the compression of the cable spring, and the return movement. This avoids excessive wear or jamming of the cable spring and guide parts of conventional drum brakes, resulting in uneven parking, and avoids problems such as long cable stroke or even brake failure caused by wear and damage of the guide parts. Each component has less wear, smoother movement, less abnormal noise, and higher transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a three-dimensional exploded view of the present invention.

[0023] Figure 3 for Figure 1 AA section view.

[0024] Figure 4 It is a structural schematic diagram of the rotating arm mechanism.

[0025] Figure 5 This is an exploded diagram of the rotating arm mechanism.

[0026] Figure 6 for Figure 1 Left view of .

[0027] Figure 7 for Figure 6 Right view of .

[0028] In the figure: 1 brake base plate, 2 cable II, 3 cable guide wheel, 4 cable bracket, 5 cable spring, 6 brake pull arm, 7 cable I, 8 saddle washer, 9 clamping retaining ring, 10 swing arm, 11 guide wheel shaft, 12 bolt, 13 swing arm tensioning spring, 14 clamping retaining ring, 15 swing arm cover, 16 swing arm pin, 17 swing arm bracket, 18 long bolt, 19 nut, 21 fixing bracket. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations.

[0030] like Figure 1 As shown, the drum brake includes a brake base plate 1, a cable guide mechanism and a swing arm mechanism assembly. The cable guide mechanism is arranged on the front side of the brake base plate 1, and the swing arm mechanism assembly is arranged on the back side of the brake base plate 1 and connected to the cable guide mechanism.

[0031] like Figure 1 and Figure 2 As shown, the wire guide mechanism includes a wire, a wire spring 5, a brake arm 6, a wire guide wheel 3 and a guide wheel shaft 11. The upper end of the brake arm 6 is hingedly mounted on one side of the upper part of the brake base plate 1. The wire spring 5 is installed on the wire. The wire is divided into a wire Ⅰ7 and a wire Ⅱ2.

[0032] The brake arm 6 is installed on one side of the lower part of the brake base plate 1, and a U-shaped bending portion with a reverse bend is provided at the bottom of the brake arm 6; the guide wheel shaft 11 is fixedly pressed on the other side of the lower part of the brake base plate 1, and the wire guide wheel 3 is sleeved on the guide wheel shaft 11. Two arc guide grooves are provided on both sides of the wire guide wheel 3, and the two arc guide grooves are respectively close to the first arc guide groove of the brake arm 6 and the second arc guide groove away from the brake arm 6; the wire bracket 4 is welded on the brake base plate 1, and one end of the wire I7 passes through the wire bracket 4 and is installed on the brake At the slot formed by the U-shaped bending part of the pull arm 6, the cylindrical joint at the other end of the pull wire Ⅰ7 passes through the first arc guide groove of the pull wire guide wheel 3 and is clamped in the slot port through the cylindrical joint at the end. The size of the cylindrical joint is larger than the slot width so that it can be clamped in the slot port. The pull wire spring 5 is fitted on the pull wire Ⅰ7 compressed between the brake pull arm 6 and the pull wire bracket 4, and the two ends of the pull wire spring 5 are respectively connected to the U-shaped bending part of the brake pull arm 6 and the slot of the pull wire bracket 4; the contact surface between the pull wire bracket 4 and the pull wire spring 5 is processed with a bend for limiting the pull wire spring 5 and the pull wire Ⅰ7.

[0033] The cylindrical joint at one end of the pull wire II 2 passes through the second arc guide groove of the pull wire guide wheel 3 and is clamped in the groove port through the cylindrical joint at the end. The size of the cylindrical joint is larger than the groove width so that it can be clamped in the groove port. The other end of the pull wire II 2 is connected to the rotating arm 10 of the rotating arm mechanism assembly.

[0034] like Figure 3 As shown, the wire guide wheel 3 is fixedly mounted on the guide wheel shaft 11 through the saddle washer 8 and the clamping retaining ring 9. The wire guide wheel 3 is first mounted on the guide wheel shaft 11, and then the saddle washer 8 is mounted, and finally the clamping retaining ring 9 is mounted to limit and fix the wire guide wheel 3 and the saddle washer 8 axially. The saddle washer 8 is used as a buffer between the saddle washer 8 and the clamping retaining ring 9. Straight knurling is processed at the position where the guide wheel shaft 11 is pressed and matched with the brake base plate 1, and is pressed into the mounting hole of the brake base plate 1.

[0035] like Figure 2As shown, the joint at one end of the pull wire Ⅰ7 connected to the slot of the U-shaped bending part of the brake pull arm 6 is a riveted hexagonal column head, square column head or cylindrical head consistent with the direction of the pull wire core line, and the joint at the other end connected to the pull wire guide wheel 3 is a cylindrical head arranged axially perpendicular to the direction of the pull wire core line.

[0036] like Figure 4 and Figure 5 As shown, the swing arm mechanism assembly includes a swing arm 10, a swing arm bracket 17, a swing arm tensioning spring 13, a swing arm pin 16, a clamping ring 14 and a swing arm cover 15; the swing arm 10 is T-shaped, divided into a straight section and a forked section connected in the middle of the straight section, a swing arm pin hole for the swing arm pin 16 to be installed is punched out in the middle of the forked section of the swing arm 10, a hook head for hanging the cable of the cable guide mechanism is processed at the end of the forked section of the swing arm 10, the forked section of the swing arm 10 is arranged toward the brake base plate 1 and passes through the brake base plate 1, a through hole connected to the handbrake cable is provided at the upper end of the straight section of the swing arm 10, the end of the handbrake cable is fixedly connected to the through hole at the upper end of the straight section of the swing arm 10, and a through hole for installing and connecting the swing arm tensioning spring 13 is provided at the lower end of the straight section of the swing arm 10;

[0037] The swing arm bracket 17 is installed on the back of the brake base plate 1, and a swing arm cover 15 is installed outside the swing arm bracket 17. There are rectangular through grooves in the middle of the swing arm bracket 17 and the swing arm cover 15. The swing arm cover 15 is sleeved on the swing arm bracket 17 to prevent dust from entering; the end of the forked section of the swing arm 10 passes through the rectangular through grooves of the swing arm cover 15 and the swing arm bracket 17, and then passes through the through groove on the brake base plate 1 and is connected to the other end of the cable Ⅱ2 of the cable guide mechanism, and a through groove for the hook head of the swing arm 10 to pass through is opened on the upper part of the brake base plate 1; raised blocks are provided on both sides of the rectangular through groove of the swing arm bracket 17, and the raised blocks on both sides are processed with through holes for the swing arm pin 16 to pass through. The swing arm pin hole of the forked section of the swing arm 10 is located between the through holes of the raised blocks on both sides and is coaxially aligned. The swing arm pin 16 passes through the swing arm pin hole of the forked section of the swing arm 10 and the through holes of the raised blocks on both sides and is locked by the clamping retaining ring 14, thereby hingedly installing the swing arm 10 and the swing arm bracket 17. In this way, the pivot arm 10 passes through the pivot arm bracket 17 and is fixed by the pivot arm pin 16 and the clamping retaining ring 14 .

[0038] like Figure 2 and Figure 6 As shown, a fixed bracket 21 is fixed on the back of the brake base plate 1, and the fixed bracket 21 is located on the brake base plate 1 on the same side as the swing arm mechanism assembly. A U-shaped groove for the swing arm 10 to pass through is processed in the middle of the fixed bracket 21 to form two arms, and the two arms of the fixed bracket 21 are provided with through holes for installing and connecting the swing arm tension spring 13; the middle part of the straight section of the swing arm 10 is arranged in the U-shaped groove of the fixed bracket 21, and the upper end of the swing arm tension spring 13 is hooked on the through hole of the support arm on one side of the fixed bracket 21, and the lower end of the swing arm tension spring 13 is hooked on the through hole at the lower end of the straight section of the swing arm 10, and both ends are tightened;

[0039] like Figure 5 As shown, the rotating arm 10 is also processed with a bent lug near the end of the upper end of the straight section, and a threaded hole is processed on the bent lug, and a long bolt 18 is installed in the threaded hole. Figure 6 As shown, the threaded end of the long bolt 18 passes through the threaded hole of the bent lug of the rotating arm 10 and is fixedly connected to the screw hole of the brake base plate 1. A nut 19 is mounted on the long bolt 18 between the bent lug and the nut end of the long bolt 18. The rotating nut 19 is used to adjust the limit position of the bent lug of the rotating arm 10 during assembly to keep the wire guide mechanism in a tensioned state. The nut 19 is used to fix and lock the position.

[0040] like Figure 2 As shown, one end joint of the cable II 2 connected to the cable guide wheel 3 is a cylindrical head arranged axially perpendicular to the cable core direction, and the other end joint is flattened and processed to form a square hole for the hook head of the rotating arm 10 to pass through. The end of the bifurcated section of the rotating arm 10 is processed with a hook head for hanging the cable II 2 of the cable guide mechanism, and the square hole is hung on the hook head after passing through the through groove of the brake bottom plate 1 at the end of the bifurcated section of the rotating arm 10.

[0041] like Figure 2 As shown, the end surface of the swing arm bracket 17 facing the brake base plate 1 of the drum brake is provided with a threaded hole for fixing with a bolt 12. The bolt 12 passes through the brake base plate 1 of the drum brake and is connected to the threaded hole, thereby fixing the swing arm bracket 17 to the brake base plate 1 of the drum brake.

[0042] like Figure 4 and Figure 5 As shown, the end hook position of the swing arm 10, the swing arm pin hole position and the through hole at the lower end of the straight section can be adjusted to form different lever ratios, thereby generating different cable pulling strokes and hill-holding forces to achieve different parking performance requirements for the vehicle.

[0043] like Figure 1 As shown, the installation position and angle of the swing arm mechanism assembly on the brake base plate 1 can be adjusted according to the structural requirements of the vehicle suspension and parking mechanism, which can more conveniently and effectively adapt to the layout of the vehicle's parking mechanism.

[0044] The implementation process of the present invention is:

[0045] When the vehicle is parked, the driver pulls the parking handbrake cable, and the end of the rotating arm 10 is pulled to rotate around the rotating arm pin 16. At the same time, the hook head of the rotating arm 10 drives the cable guide mechanism to move around the rotating arm pin 16, that is, the rotating arm 10 drives the cable Ⅱ2 to move, and the cable guide wheel 3 rotates under the traction of the cable Ⅱ2. The cable Ⅰ7 is pulled, driving the brake arm 6 to rotate, and the cable spring 5 is compressed, thereby pulling the brake arm 6 to expand the brake shoe and press the brake drum to achieve parking.

[0046] When the driver releases the handbrake cable, the brake arm 6 returns to its original position under the return action of the cable spring 5.

[0047] It can be seen that the entire movement process of the present invention only involves the rotation of the cable guide wheel, the entire parking mechanism has less wear, the movement is smoother, the transmission efficiency is higher, and the abnormal parking noise is improved.

[0048] In addition, the present invention can be installed at an adjustable position and angle on the brake base plate according to the structural requirements of the vehicle suspension and parking mechanism, has good adaptability, small winding loss, and can adjust the swing arm lever ratio to change the wire pulling stroke and the slope holding force. When the requirements of the whole vehicle change, adjustments can be made faster and more conveniently, with a short cycle and saved mold repair costs.

[0049] The above examples are for the purpose of illustrating the present invention, not for limiting the present invention. Any simple modification of the present invention belongs to the protection scope of the present invention.

Claims

1. A new drum brake with a double-cable rotating arm mechanism, the drum brake comprising a brake base plate (1) and a cable guide mechanism, the cable guide mechanism being arranged on the front of the brake base plate (1), the cable guide mechanism comprising a cable, a cable spring (5) and a brake arm (6), the upper end of the brake arm (6) being hingedly mounted on one side of the upper part of the brake base plate (1), characterized in that: The drum brake also includes a rotating arm mechanism assembly, which is arranged on the back of the brake base plate (1) and connected to the cable guide mechanism. The cable guide mechanism also includes a cable guide wheel (3) and a guide wheel shaft (11). The cables are divided into cable I (7) and cable II (2). The brake arm (6) is installed on one side of the lower part of the brake base plate (1), and a U-shaped bending portion is provided at the bottom of the brake arm (6). The guide wheel shaft (11) is fixedly pressed on the other side of the lower part of the brake base plate (1), and the cable guide wheel (3) is sleeved on the guide wheel shaft (11). Two arc guide grooves are provided on both sides of the cable guide wheel (3), and the two arc guide grooves are respectively close to the first arc guide groove of the brake arm (6) and the second arc guide groove away from the brake arm (6). The bracket (4) is welded on the brake base plate (1); one end of the cable I (7) passes through the cable bracket (4) and is installed in a slot formed by the U-shaped bending portion of the brake arm (6); the other end of the cable I (7) passes through the first arc-shaped guide slot of the cable guide wheel (3) and is clamped in the slot end through a cylindrical joint at the end; a cable spring (5) is sleeved and compressed on the cable I (7) between the brake arm (6) and the cable bracket (4); the two ends of the cable spring (5) are respectively connected to the U-shaped bending portion of the brake arm (6) and the slot of the cable bracket (4); one end of the cable II (2) passes through the second arc-shaped guide slot of the cable guide wheel (3) and is clamped in the slot end through a cylindrical joint at the end; the other end of the cable II (2) is connected to the swing arm (10) of the swing arm mechanism assembly; The swing arm mechanism assembly comprises a swing arm (10), a swing arm bracket (17), a swing arm tension spring (13), a swing arm pin (16), a first clamping retaining ring (14) and a swing arm cover (15); the swing arm (10) is T-shaped, and is divided into a straight section and a forked section connected in the middle of the straight section; a swing arm pin hole for the swing arm pin (16) to be installed is provided in the middle of the forked section of the swing arm (10); a through hole connected to a hand brake cable is provided at the upper end of the straight section of the swing arm (10); and a through hole is provided at the lower end of the straight section of the swing arm (10); the swing arm bracket (17) is installed on the back of the brake base plate (1); A swivel arm cover (15) is installed outside the arm bracket (17), and the middle of the swivel arm bracket (17) and the swivel arm cover (15) are both provided with a rectangular through slot. The end of the bifurcated section of the swivel arm (10) passes through the rectangular through slots of the swivel arm cover (15) and the swivel arm bracket (17), and then passes through the through slot on the brake base plate (1) and is connected to the other end of the cable II (2) of the cable guide mechanism; raised blocks are provided on both sides of the rectangular through slot of the swivel arm bracket (17), and the raised blocks on both sides are processed with through holes for the swivel arm pin (16) to pass through. The swivel arm pin hole of the bifurcated section of the swivel arm (10) is located between the through holes of the raised blocks on both sides and is The axes are aligned, and the arm pin (16) passes through the arm pin hole of the bifurcated section of the arm (10) and the through holes of the protruding blocks on both sides and is locked by the first clamping ring (14), so that the arm (10) and the arm bracket (17) are hingedly installed; a fixed bracket (21) is fixed on the back of the brake base plate (1), and a U-shaped groove for the arm (10) to pass through is processed in the middle of the fixed bracket (21) to form two arms, and the two arms of the fixed bracket (21) are provided with through holes; the middle of the straight section of the arm (10) is arranged in the U-shaped groove of the fixed bracket (21), and the arm tension spring (13) The upper end is hooked on the through hole of the support arm on one side of the fixed bracket (21), and the lower end of the swing arm tension spring (13) is hooked on the through hole at the lower end of the straight end of the swing arm (10); the swing arm (10) is also processed with a bent lug near the end of the upper end of the straight section, and the bent lug is processed with a threaded hole, and a long bolt (18) is installed in the threaded hole, and the threaded end of the long bolt (18) passes through the threaded hole of the bent lug of the swing arm (10) and is fixedly connected to the screw hole of the brake base plate (1), and a nut (19) is sleeved on the long bolt (18) between the bent lug and the nut end of the long bolt (18).

2. The novel drum brake with double-pull cable and rotating arm mechanism according to claim 1 is characterized in that: A square hole is provided at the other end of the pull wire II (2), and a hook head for hanging the pull wire II (2) of the pull wire guide mechanism is processed at the end of the bifurcated section of the rotating arm (10), and the square hole is hung on the hook head after the end of the bifurcated section of the rotating arm (10) passes through the through groove of the brake bottom plate (1).

3. The novel drum brake with double-pull cable and rotating arm mechanism according to claim 1 is characterized in that: The swing arm bracket (17) is provided with a threaded hole for fixing with a bolt (12) on the end surface facing the brake base plate (1) of the drum brake. The bolt (12) passes through the brake base plate (1) of the drum brake and is connected to the threaded hole, thereby fixing the swing arm bracket (17) to the brake base plate (1) of the drum brake.

4. The novel drum brake with double-pull cable and rotating arm mechanism according to claim 1 is characterized in that: The wire drawing guide wheel (3) is fixedly mounted on the guide wheel shaft (11) via a saddle washer (8) and a second clamping retaining ring (9).

5. The novel drum brake with double-pull cable and rotating arm mechanism according to claim 1 is characterized in that: The position where the guide wheel shaft (11) is pressed into engagement with the brake base plate (1) is processed with straight knurling and is pressed into the mounting hole of the brake base plate (1).

6. The novel drum brake with double-pull cable and rotating arm mechanism according to claim 1 is characterized in that: The contact surface between the wire support (4) and the wire spring (5) is processed with a bend, which is used to limit the wire spring (5) and the wire I (7).

7. The novel drum brake with double-pull cable and rotating arm mechanism according to claim 1 is characterized in that: The end joint of the pull wire I (7) connected to the slot of the U-shaped bending part of the brake pull arm (6) is a hexagonal column head, square column head or cylindrical head riveted in the same direction as the pull wire core wire, and the other end joint connected to the pull wire guide wheel (3) is a cylindrical head arranged axially perpendicular to the direction of the pull wire core wire.

8. The novel drum brake with double-pull cable and rotating arm mechanism according to claim 1 is characterized in that: The connector at one end of the pull wire II (2) connected to the pull wire guide wheel (3) is a cylindrical head arranged axially perpendicular to the direction of the pull wire core wire, and the connector at the other end is flattened and processed to form a square hole for the hook head of the rotating arm (10) to pass through.

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