Brake system for test and vehicle sample

Abstract

The utility model relates to the technical field of vehicle engineering, and provides a brake system for a test and a vehicle sample, in a drum brake, a cam shaft is inserted into a brake bottom plate and can rotate relatively, two brake shoes are arranged, and the two brake shoes are rotationally connected with the brake bottom plate; the return spring enables the two brake shoes to always clamp the peripheral side wall of the cam shaft, the friction plate is fixed to the brake bottom plate, and the brake shoes can be driven by the cam shaft to abut against the friction plate. The swing arm assembly comprises a first-stage swing arm and a second-stage swing arm, the second-stage swing arm and the first-stage swing arm can mutually slide or be mutually locked in the first direction, and the first-stage swing arm is fixed to the cam shaft. The rope pulling device comprises a pulling rope, and one end of the pulling rope is connected with the side, away from the first-stage swing arm, of the second-stage swing arm in the first direction. The first direction is perpendicular to the axial direction of the cam shaft. Therefore, the test requirement can be met, the optimal swing arm length of different vehicle types can be conveniently determined, and the requirement of a user for use comfort is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle engineering technical field especially, relates to a test brake system and vehicle sample. BACKGROUND

[0002] In order to use demand, vehicle is constantly iterating new, and vehicle needs to use the sample of its model to carry out safety test before formal production, and the parking test of brake system is particularly important.

[0003] Because the configuration of different models of vehicles is different, and the structure size is also different, leading to the quality of different models of vehicles is different, according to the inertia theorem, inertia is proportional to mass, so the braking force required by different models of vehicles is different.

[0004] In the field of electric vehicles, drum brake is a common configuration, and the brake rocker arm specification of drum brake is limited, and for new type or different handle lever ratio, the limited brake rocker arm specification cannot simultaneously consider hand feeling and braking force.

[0005] Therefore, a test brake system and vehicle sample are needed to solve the above technical problems. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a test brake system vehicle sample, which can meet the test needs, determine the optimal swing arm length of different vehicle models, and meet the user's requirement for use comfort.

[0007] To achieve this purpose, the utility model adopts the following technical scheme:

[0008] The test brake system comprises:

[0009] A drum brake, the drum brake comprises a camshaft, a brake shoe, a brake bottom plate, a friction plate and a return spring, the camshaft is inserted into the brake bottom plate and can rotate relative to the brake bottom plate, the brake shoe is provided with two, the two brake shoes are rotationally connected with the brake bottom plate, the return spring makes the two brake shoes always clamp the circumferential wall of the camshaft, the friction plate is fixed to the brake bottom plate, and the brake shoe can abut against the friction plate under the drive of the camshaft;

[0010] A swing arm assembly, the swing arm assembly comprises a primary swing arm and a secondary swing arm, the secondary swing arm and the primary swing arm can slide or lock each other along a first direction, and the primary swing arm is fixed to the camshaft.

[0011] A pull rope device, the pull rope device comprises a pull rope, one end of the pull rope is connected with the secondary swing arm on the side away from the primary swing arm along the first direction.

[0012] The first direction is perpendicular to the axial direction of the camshaft.

[0013] As a preferred technical solution of the test brake system, the primary swing arm is provided with a polygonal hole, the camshaft comprises a first shaft section and a second shaft section, the radial section of the first shaft section is in the shape of a cam, and is clamped between the two brake shoes, and the radial section of the second shaft section is in the shape of a polygon, and is clamped in the polygonal hole.

[0014] As a preferred technical solution of the test brake system, a positioning assembly is further included, the positioning assembly comprises a positioning bolt and a positioning nut, the primary swing arm is provided with a through hole in the second direction, the positioning bolt is inserted into the through hole and penetrates the camshaft, the positioning bolt is screwed with the positioning nut, and the primary swing arm is clamped between the nut of the positioning bolt and the positioning nut.

[0015] The first direction, the second direction and the axial direction of the camshaft are perpendicular to each other.

[0016] As a preferred technical solution of the test brake system, the sidewalls of the through hole in the axial direction of the camshaft are provided with the polygonal hole, and the second shaft section is inserted into the two polygonal holes.

[0017] As a preferred technical solution of the test brake system, the camshaft further comprises a third shaft section, the first shaft section, the second shaft section and the third shaft section are arranged in sequence along the axial direction, and the first shaft section and the second shaft section form a shaft shoulder capable of abutting against the primary swing arm.

[0018] The third shaft section is provided with external threads, and is threadedly connected with a nut after penetrating the primary swing arm.

[0019] Alternatively, the third shaft section is provided with a threaded hole, and is threadedly connected with a bolt after penetrating the primary swing arm.

[0020] As a preferred technical solution of the test brake system, at least one of the primary swing arm and the secondary swing arm is provided with a waist-shaped hole in the first direction, a threaded fastener connects the primary swing arm and the secondary swing arm, and the threaded fastener is inserted into the waist-shaped hole and can slide or be locked in the first direction.

[0021] As a preferred technical solution of the test brake system, the primary swing arm and / or the secondary swing arm is provided with a plurality of waist-shaped holes, and the plurality of waist-shaped holes are arranged in parallel, the primary swing arm and the secondary swing arm are connected by at least two threaded fasteners, and the at least two threaded fasteners are inserted into two parallel waist-shaped holes.

[0022] As a preferred technical scheme of the test brake system, the first swing arm is provided with a plurality of first waist-shaped holes, the second swing arm is provided with a second waist-shaped hole corresponding to the first waist-shaped hole, the same threaded fastener is inserted into the first waist-shaped hole and the second waist-shaped hole, at least one threaded fastener is located at one end of the first waist-shaped hole close to the camshaft, and at least one threaded fastener is located at one end of the second waist-shaped hole close to the pull rope.

[0023] As a preferred technical scheme of the test brake system, the second swing arm is provided with a mounting groove, the pull rope device further comprises a joint, the joint is rotatably inserted into the mounting groove and is rotatably connected with the second swing arm, and the rotation axis is parallel to the axial direction of the camshaft, and the pull rope is connected with the second swing arm through the joint.

[0024] A vehicle sample is also provided, which comprises a vehicle body and the test brake system, the brake bottom plate is fixed to the vehicle body, and the other end of the pull rope is connected to the brake handle of the vehicle body.

[0025] The utility model has the advantages of:

[0026] The camshaft is inserted into the brake bottom plate, the pull rope can drive the camshaft to rotate relative to the brake bottom plate through the swing arm assembly, the two brake shoes are hinged to the brake bottom plate and located at opposite sides of the camshaft, the two acting ends of the return spring are connected to the two brake shoes respectively, so that the two brake shoes always have a tendency to approach one side of the camshaft, and thus the brake shoes always abut against the side wall of the camshaft, the camshaft comprises a large-diameter part and a small-diameter part, and the two brake shoes can be clamped on the large-diameter part or the small-diameter part, when the brake shoes clamp the small-diameter part, the two brake shoes approach each other and are away from the friction plate, when the brake shoes clamp the large-diameter part, the two brake shoes are away from each other and abut against the friction plate, friction occurs between the brake shoes and the friction plate, and parking is realized. The first swing arm and the second swing arm of the swing arm assembly can be adjusted in the first direction perpendicular to the axial direction of the camshaft, and the length of the force arm between the pull rope and the camshaft can be changed, so that when the output force of the pull rope is constant, different torques can be applied to the camshaft by only modifying the overall length of the swing arm assembly, thus the test requirements can be met, the optimal swing arm length of different vehicle models can be determined, and the user's requirement for use comfort can be met. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and the drawings by those skilled in the art without creating any creative labor.

[0028] Fig. 1 is a structural schematic view of the test brake system provided by the embodiment of the utility model, and

[0029] Fig. 2 is a back view of the test brake system provided by the embodiment of the utility model, and

[0030] Fig. 3 is a structural schematic view of the swing arm assembly provided by the embodiment of the utility model, and

[0031] Fig. 4 is an exploded schematic view of the swing arm assembly provided by the embodiment of the utility model.

[0032] In the figure,

[0033] X, first direction; Y, second direction; Z, axial direction of the camshaft,

[0034] 100, drum brake; 110, camshaft; 120, brake shoe; 130, brake bottom plate; 140, return spring,

[0035] 200, swing arm assembly; 210, primary swing arm; 211, polygonal hole; 212, through hole; 213, first waist-shaped hole; 220, secondary swing arm; 221, second waist-shaped hole; 222, mounting groove; 230, threaded fastener,

[0036] 300, pull rope device; 310, pull rope; 320, joint,

[0037] 400, positioning assembly; 410, positioning bolt; 420, positioning nut. DETAILED DESCRIPTION

[0038] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0039] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through the intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature "on", "above" and "upper surface of" second feature includes that first feature is directly above and obliquely above second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature "under", "below" and "under surface of" second feature includes that first feature is directly below and obliquely below second feature, or only indicates that horizontal height of first feature is less than second feature.

[0041] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and "radial" refer to the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0042] As shown in Figs. 1 to 4 The utility model provides a kind of brake system for test, including drum brake 100, swing arm assembly 200 and pull rope device 300. Among them, drum brake 100 includes camshaft 110, brake shoe 120, brake bottom plate 130, friction plate and return spring 140, camshaft 110 is inserted in brake bottom plate 130 and can rotate relatively, brake shoe 120 is provided with two, two brake shoe 120 is rotatably connected with brake bottom plate 130, return spring 140 makes two brake shoe 120 always clamping the circumferential wall of camshaft 110, friction plate is fixed to brake bottom plate 130, brake shoe 120 can be driven by camshaft 110 and is in abutment with friction plate;Swing arm assembly 200 includes primary swing arm 210 and secondary swing arm 220, secondary swing arm 220 and primary swing arm 210 can slide each other or be locked each other along first direction X, primary swing arm 210 is fixed with camshaft 110;Pull rope device 300 includes pull rope 310, one end of pull rope 310 is connected with secondary swing arm 220 on the side of first direction X away from primary swing arm 210;First direction X is perpendicular to the axial direction Z of camshaft 110.

[0043] Exemplarily, the camshaft 110 is inserted into the brake bottom plate 130, the pull rope 310 can drive the camshaft 110 to rotate relative to the brake bottom plate 130 through the swing arm assembly 200, both brake shoes 120 are hinged with the brake bottom plate 130 and located at opposite sides of the camshaft 110, both action ends of the return spring 140 are connected with both brake shoes 120, so that both brake shoes 120 always have a tendency to approach one side of the camshaft 110, thereby making the brake shoe 120 always abut against the side wall of the camshaft 110, the camshaft 110 comprises a large-diameter part and a small-diameter part, both brake shoes 120 can be clamped on the large-diameter part or the small-diameter part, when the brake shoe 120 clamps the small-diameter part, both brake shoes 120 approach each other and are away from the friction plate; when the brake shoe 120 clamps the large-diameter part, both brake shoes 120 are away from each other and abut against the friction plate, friction occurs between the brake shoe 120 and the friction plate, and parking is realized.

[0044] It should be noted that the drum brake 100 is a prior art structure, and its specific structure will not be further described here.

[0045] The first swing arm 210 and the second swing arm 220 of the swing arm assembly 200 can be adjusted along the first direction X perpendicular to the axial direction Z of the camshaft 110, so as to change the length of the force arm between the pull rope 310 and the camshaft 110, so that when the output force of the pull rope 310 is constant, different torques can be applied to the camshaft 110 by only modifying the overall length of the swing arm assembly 200, so that the test requirements can be met, and the optimal swing arm length of different vehicle models can be determined to meet the user's requirements for use comfort.

[0046] Optionally, the first swing arm 210 is provided with a polygonal hole 211, and the camshaft 110 comprises a first shaft segment and a second shaft segment, the radial section of the first shaft segment is in a cam shape and is clamped between the two brake shoes 120, and the radial section of the second shaft segment is in a polygonal shape and is connected in the polygonal hole 211.

[0047] Exemplarily, the swing arm assembly 200 and the brake shoe 120 are located on the front and back sides of the brake bottom plate 130 respectively, the first swing arm 210 is provided with a rectangular hole along the axial direction Z of the camshaft 110, the camshaft 110 penetrates through the brake bottom plate 130, the first shaft segment of the camshaft 110 is located on the same side as the brake shoe 120, the radial section of the first shaft segment is in a cam shape and is used to drive the brake shoe 120 to open and close, the second shaft segment is located on the same side as the swing arm assembly 200, and the second shaft segment is in a rectangular shape, the second shaft segment is inserted into the rectangular hole and can prevent the camshaft 110 from rotating relative to the first swing arm 210.

[0048] It should be noted that the first swing arm 210 is provided with a polygonal hole 211, and the radial section of the second shaft section of the camshaft 110 satisfies that the radial section is non-circular and the circumscribed circle is larger than the inscribed circle of the polygonal hole 211 of the first swing arm 210, that is, the clamping of the camshaft 110 and the first swing arm 210 can be realized.

[0049] Optionally, the test brake system further comprises a positioning assembly 400, the positioning assembly 400 comprises a positioning bolt 410 and a positioning nut 420, the first swing arm 210 is provided with a through hole 212 in the second direction Y, the positioning bolt 410 is inserted into the through hole 212 and penetrates the camshaft 110, the positioning bolt 410 is screwed with the positioning nut 420, and the first swing arm 210 is clamped between the nut of the positioning bolt 410 and the positioning nut 420; the first direction X, the second direction Y and the axial direction Z of the camshaft 110 are perpendicular to each other.

[0050] Optionally, the camshaft 110 is provided with a U-shaped groove, when the camshaft 110 is inserted into the first swing arm 210, the U-shaped groove is exposed in the through hole 212 and the length direction of the U-shaped groove is parallel to the second direction Y, the positioning bolt 410 penetrates the through hole 212 in the second direction Y and is partially inserted into the U-shaped groove, the first swing arm 210 is clamped between the nut of the positioning bolt 410 and the positioning nut 420, the relative fixation of the positioning bolt 410 and the first swing arm 210 is completed, and the positioning bolt 410 is partially inserted into the U-shaped groove and can abut against the opposite two side walls of the U-shaped groove in the axial direction Z of the camshaft 110, so as to limit the relative position between the camshaft 110 and the first swing arm 210 and prevent the camshaft 110 from being withdrawn from the polygonal hole 211 in the axial direction thereof.

[0051] Optionally, the through hole 212 is provided with a polygonal hole 211 on the side wall in the axial direction Z of the camshaft 110, and the second shaft section is inserted into the two polygonal holes 211. In this way, the camshaft 110 and the first swing arm 210 form two limiting supports, so that the connection between the first swing arm 210 and the camshaft 110 is more stable.

[0052] Optionally, the camshaft 110 further comprises a third shaft section, the first shaft section, the second shaft section and the third shaft section are arranged in sequence in the axial direction; the first shaft section and the second shaft section form a shaft shoulder capable of abutting against the first swing arm 210; the third shaft section is provided with external threads and is threadedly connected with the nut after penetrating the first swing arm 210; or, the third shaft section is provided with a threaded hole and is threadedly connected with the bolt after penetrating the first swing arm 210.

[0053] In this way, after the second shaft segment is inserted into the primary swing arm 210, the third shaft segment can pass out of the primary swing arm 210. In one embodiment, the third shaft segment is cylindrical and has a threaded structure on the outer peripheral wall, which is screwed with a nut. In this way, the primary swing arm 210 is clamped between the shaft shoulder and the nut in the axial direction Z of the camshaft 110. In another embodiment, the third shaft segment has a threaded hole in the axial direction Z of the camshaft 110, which is connected with a bolt. In this way, the primary swing arm 210 is clamped between the shaft shoulder and the nut in the axial direction Z of the camshaft 110. The primary swing arm 210 and the camshaft 110 are fixed in position in the axial direction.

[0054] Optionally, at least one of the primary swing arm 210 and the secondary swing arm 220 has a waist-shaped hole in the first direction X, and the threaded fastener 230 connects the primary swing arm 210 and the secondary swing arm 220, and is inserted into the waist-shaped hole and can slide or be locked in the first direction X.

[0055] Optionally, at least one of the primary swing arm 210 and the secondary swing arm 220 has a waist-shaped hole in the first direction X, and the threaded fastener 230 connects the primary swing arm 210 and the secondary swing arm 220, and is inserted into the waist-shaped hole and can slide or be locked in the first direction X.

[0056] Optionally, the primary swing arm 210 and / or the secondary swing arm 220 has a plurality of waist-shaped holes, and the plurality of waist-shaped holes are arranged in parallel. The primary swing arm 210 and the secondary swing arm 220 are connected by at least two threaded fasteners 230, and the at least two threaded fasteners 230 are inserted into two parallel waist-shaped holes.

[0057] Optionally, the primary swing arm 210 and / or the secondary swing arm 220 has a plurality of waist-shaped holes, and the plurality of waist-shaped holes are arranged in parallel. The primary swing arm 210 and the secondary swing arm 220 are connected by at least two threaded fasteners 230, and the at least two threaded fasteners 230 are inserted into two parallel waist-shaped holes.

[0058] Optionally, the primary swing arm 210 has a plurality of first waist-shaped holes 213, and the secondary swing arm 220 has a plurality of second waist-shaped holes 221 corresponding to the first waist-shaped holes 213. The threaded fastener 230 is inserted into the first waist-shaped hole 213 and the second waist-shaped hole 221. At least one threaded fastener 230 is located at one end of the first waist-shaped hole 213 close to the camshaft 110, and at least one threaded fastener 230 is located at one end of the second waist-shaped hole 221 close to the pull rope 310.

[0059] Therefore, the first swing arm 210 and the second swing arm 220 are respectively provided with the waist-shaped holes, and the threaded fastener 230 is inserted into the first waist-shaped hole 213 and the second waist-shaped hole 221, so that the swing arm can be adjusted in a relatively large range.

[0060] Optionally, the second swing arm 220 is provided with the mounting groove 222, and the pull rope device 300 further comprises a joint 320, the joint 320 is rotatably inserted into the mounting groove 222 and is rotatably connected with the second swing arm 220, and the rotation axis is parallel to the axial direction Z of the cam shaft 110, and the pull rope 310 is connected with the second swing arm 220 through the joint 320.

[0061] Optionally, the second swing arm 220 is provided with the mounting groove 222, and the pull rope device 300 further comprises a joint 320, the joint 320 is rotatably inserted into the mounting groove 222 and is rotatably connected with the second swing arm 220, and the rotation axis is parallel to the axial direction Z of the cam shaft 110, and the pull rope 310 is connected with the second swing arm 220 through the joint 320.

[0062] Further provided is a vehicle sample comprising a vehicle body and the above-mentioned test brake system, the brake bottom plate 130 is fixed to the vehicle body, and the other end of the pull rope 310 is connected to the brake handle of the vehicle body.

[0063] The vehicle sample is a test sample before the vehicle is formally put into production. Because the configurations of different models of vehicles are different, the structural sizes are also different, resulting in that the masses of different models of vehicles are different. According to the inertia theorem, the inertia is proportional to the mass. Therefore, the brake force required by different models of vehicles is different. In order to meet the user's application of the same size of force, the parking of different models of vehicles can be completed, so that the user can quickly adapt to the new vehicle and improve the user's experience. In the test stage of the new vehicle, the vehicle sample adopts the above-mentioned brake system, the length of the swing arm assembly 200 is changed, that is, the length of the force arm is changed. According to the formula: torque is equal to the product of force and force arm, it can be known that when the size of the applied force is constant, the longer the force arm, the greater the torque generated. The torque acts on the cam shaft 110 to drive the brake shoe 120 and the friction plate to abut and generate friction. That is, when the mass of the vehicle sample is greater, the torque required by the cam shaft 110 for parking is greater, and the length of the force arm is increased, so that the size of the applied force remains unchanged, and the effect of outputting a larger torque can still be achieved. Conversely, the length of the torque between the pull rope 310 of the vehicle sample and the cam shaft 110 can be determined in this way. The applicability of the test brake system is relatively large, and can be applied to vehicle samples of different vehicle models and can be repeatedly used.

[0064] In addition, the above is only the preferred embodiment of the present application and the applied technical principle. The person skilled in the art can understand that the present application is not limited to the specific embodiments herein, and various obvious changes, re-adjustments and substitutions can be made by the person skilled in the art without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A test brake system characterized by, The drum brake (100) comprises a camshaft (110), brake shoes (120), a brake bottom plate (130), a friction plate and a return spring (140), the camshaft (110) is inserted into the brake bottom plate (130) and can rotate relatively, the brake shoes (120) are provided with two, the two brake shoes (120) are rotationally connected with the brake bottom plate (130), the return spring (140) makes the two brake shoes (120) always clamp the circumferential wall of the camshaft (110), the friction plate is fixed to the brake bottom plate (130), and the brake shoes (120) can abut against the friction plate under the drive of the camshaft (110). The swing arm assembly (200) comprises a primary swing arm (210) and a secondary swing arm (220), the secondary swing arm (220) and the primary swing arm (210) can slide or lock with each other along a first direction (X), and the primary swing arm (210) is fixed with the camshaft (110). The pull rope device (300) comprises a pull rope (310), one end of the pull rope (310) is connected with the secondary swing arm (220) on one side away from the primary swing arm (210) along the first direction (X). The first direction (X) is perpendicular to the axial direction (Z) of the camshaft (110). The primary swing arm (210) is provided with a polygonal hole (211), the camshaft (110) comprises a first shaft segment and a second shaft segment, the radial section of the first shaft segment is in a cam shape, clamped between the two brake shoes (120), and the radial section of the second shaft segment is in a polygonal shape, clamped in the polygonal hole (211).

2. The test brake system of claim 1, wherein Further comprising a positioning assembly (400), the positioning assembly (400) comprises a positioning bolt (410) and a positioning nut (420), the primary swing arm (210) is provided with a through hole (212) along a second direction (Y), the positioning bolt (410) is inserted into the through hole (212) and penetrates through the camshaft (110), the positioning bolt (410) is screwed with the positioning nut (420), and the primary swing arm (210) is clamped between the nut of the positioning bolt (410) and the positioning nut (420).

3. The test brake system of claim 2, wherein The first direction (X), the second direction (Y) and the axial direction (Z) of the camshaft (110) are perpendicular to each other. The side wall of the through hole (212) in the axial direction (Z) of the camshaft (110) is provided with the polygonal hole (211), and the second shaft segment is inserted into the two polygonal holes (211).

4. The test brake system of claim 3, wherein The camshaft (110) further comprises a third shaft segment, the first shaft segment, the second shaft segment and the third shaft segment are arranged in sequence along the axial direction, an axial shoulder capable of abutting against the primary swing arm (210) is formed between the first shaft segment and the second shaft segment; 5. The test brake system of claim 2 wherein, The third shaft segment is provided with external threads and is threadedly connected with a nut after penetrating through the primary swing arm (210). ​ Or, the third shaft section is provided with a threaded hole, and the threaded hole is threadedly connected with a bolt after penetrating the primary swing arm (210).

6. The test brake system of claim 1, wherein At least one of the primary swing arm (210) and the secondary swing arm (220) is provided with a waist-shaped hole along the first direction (X), a threaded fastener (230) connects the primary swing arm (210) and the secondary swing arm (220), and the threaded fastener (230) is inserted into the waist-shaped hole and can slide or be locked along the first direction (X).

7. The test brake system of claim 6 wherein, The primary swing arm (210) and / or the secondary swing arm (220) is provided with a plurality of waist-shaped holes, and the plurality of waist-shaped holes are arranged in parallel, the primary swing arm (210) and the secondary swing arm (220) are connected by at least two threaded fasteners (230), and the at least two threaded fasteners (230) are inserted into two parallel waist-shaped holes.

8. The test brake system of claim 7, wherein The primary swing arm (210) is provided with a plurality of first waist-shaped holes (213), the secondary swing arm (220) is provided with a plurality of second waist-shaped holes (221) corresponding to the first waist-shaped holes (213), the same threaded fastener (230) is inserted into the first waist-shaped hole (213) and the second waist-shaped hole (221), at least one threaded fastener (230) is located at one end of the first waist-shaped hole (213) close to the camshaft (110), and at least one threaded fastener (230) is located at one end of the second waist-shaped hole (221) close to the pull rope (310).

9. A test brake system according to any one of claims 1-8, characterized in that The secondary swing arm (220) is provided with a mounting groove (222), the pull rope device (300) further comprises a joint (320), the joint (320) is rotatably inserted into the mounting groove (222) and rotatably connected with the secondary swing arm (220), and the rotation axis is parallel to the axial direction (Z) of the camshaft (110), the pull rope (310) is connected with the secondary swing arm (220) through the joint (320).

10. A vehicle sample characterized by, The brake system for testing according to any one of claims 1-9 is included in a vehicle body, the brake base plate (130) is fixed to the vehicle body, and the other end of the pull rope (310) is connected to a brake handle of the vehicle body.

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