Full-expansion type drum brake device

Abstract

The invention provides a full-expansion type drum brake device which comprises a chassis and a swing arm, the swing arm is rotatably arranged on the chassis, two shoes are oppositely arranged on the chassis, brake pads are fixedly arranged on the sides, deviating from each other, of the two shoes, and a driving assembly used for swinging along with the swing arm to drive the two shoes to expand is arranged on the chassis. A reset piece is further arranged between the two horseshoes. The device has the advantages that the braking effect is good, and the driving component is not easy to damage compared with the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of brake device design, and in particular to a full-expansion drum brake device. Background Art

[0002] Drum brake is a simple and low-cost vehicle braking system, mainly composed of brake drum and brake arm. When the brake pedal is pressed, the brake arm will squeeze the inner wall of the brake drum, generating friction to achieve braking. Most of the existing battery two-wheeled and three-wheeled vehicles use drum brake devices.

[0003] Existing drum brakes, such as the invention patent with publication number CN112780703A and name "A drum brake mechanism", include a shell, a brake shaft and a brake assembly installed on the shell. The shell is also provided with a rocker arm, one end of the rocker arm is connected to the brake shaft, and the other end is connected to the brake line. The brake line pulls the rocker arm to swing it, so that the brake shaft drives the brake assembly to brake. The shell is also provided with a rocker arm reset member, which includes a spring and a limit member. The spring provides a reset force for the rocker arm after braking, and the limit member limits the spring to extend and retract in a straight line direction.

[0004] The above-mentioned drum brake drives the connection between it and the brake pad to be expanded by the swing of the rocker arm, so that the two sides of the brake pad abut against the brake drum to achieve braking. However, in actual use, the part of the brake pad that abuts the brake drum after it is expanded is small, resulting in poor braking effect. In addition, this type of drum brake is achieved by engaging the horseshoe with multiple toothed rollers and pushing the horseshoe to expand outward. This type of expansion method causes greater wear on the teeth, thereby resulting in a shorter service life of the entire device. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a full-expansion drum brake device, which is used to solve the technical problem of poor braking effect of the prior drum brake in the background technology.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A fully-expandable drum brake device comprises a chassis and a swing arm, wherein the swing arm is rotatably mounted on the chassis, two horseshoes are disposed opposite to each other on the chassis, brake pads are fixedly mounted on the sides of the two horseshoes facing away from each other, a driving assembly is disposed on the chassis for driving the two horseshoes to expand as the swing arm swings, and a reset member is also disposed between the two horseshoes.

[0008] By adopting the above technical solution, the swing arm is rotated on the chassis, and the driving assembly is driven to make the horseshoe drive the brake pad to expand in the direction away from the axis position of the chassis, and abut against the inner wall of the brake drum installed on the chassis to achieve effective braking. The reset member effectively drives the brake pad to reset on the chassis and release the braking state.

[0009] The present invention is further configured as follows: the driving assembly includes a connecting rod, a half gear and an abutment ring with a tooth groove on the side wall; a connecting sleeve is rotatably penetrated on the chassis, one end of the connecting sleeve is fixedly connected to the swing arm, the connecting rod is fixed to the other end of the connecting sleeve, the half gear is fixed to the end of the connecting rod away from the swing arm, the abutment ring is rotatably provided on the chassis and is located between the two horseshoes, the abutment ring abuts against the inner walls of the two horseshoes respectively, and the abutment ring and the half gear are meshed with each other.

[0010] By adopting the above technical solution, the swing arm can effectively drive the connecting rod to rotate through the connecting sleeve when rotating, and drive the half gear at the end of the connecting rod to rotate. The rotation of the half gear effectively rotates the abutment ring meshing with it, and further causes the two horseshoes abutting the abutment ring to expand outward.

[0011] The present invention is further configured as follows: two abutment members are provided on the abutment ring, a roller shaft is rotatably provided on the inner wall of each horseshoe, the two abutment members abut against the two roller shafts respectively, limiting grooves are respectively provided at both ends of the opposite sides of the two horseshoes, four limiting rods are provided on the chassis, and the four limiting rods are respectively and correspondingly slidably arranged in the four limiting grooves.

[0012] By adopting the above technical solution, the abutment member and the corresponding roller are abutted against each other, so that the horseshoe drives the brake pad to expand outward. The position and direction of the horseshoe's expansion can be effectively limited by the limiting rod and the limiting groove, preventing the horseshoe from slipping out or failing to be abutted and expanded.

[0013] The present invention is further configured as follows: the abutment member is two abutment blocks, the two abutment blocks are adjacent to each other to form a V-shaped angle, the roller shaft is located between the V-shaped angles of the two abutment blocks, and the width of the limiting groove is the same as the width of the limiting rod.

[0014] By adopting the above technical solution, the roller is located within the V-shaped angle of the two adjacent abutment blocks in the initial state, so that the user can easily realize the expansion of the two horseshoes regardless of whether the swing arm is rotated forward or backward.

[0015] The present invention is further configured as follows: the abutment member is an abutment block, the abutment block rotates toward the corresponding roller shaft, and the width of the limiting groove is the same as the width of the limiting rod.

[0016] By adopting the above technical solution, such an arrangement can save costs, and the abutment block can be driven to rotate in the direction of the roller shaft by rotating the abutment ring, so that the horseshoe can be expanded on the chassis.

[0017] The present invention is further configured as follows: the abutment member is an abutment block, the abutment block rotates toward the corresponding roller shaft, the width of the limiting groove on the side away from the rotation direction of the abutment block is greater than the width of the corresponding limiting rod, and the width of the limiting groove on the side toward the rotation direction of the abutment block is the same as the width of the corresponding limiting rod.

[0018] By adopting the above technical solution, such a setting can effectively expand the horseshoe through the abutment between the abutment block and the roller shaft. The end of the horseshoe where the upper limit groove is larger than the width of the limit rod will rotate outward in a small range, and the end of the horseshoe where the upper limit groove is the same width as the limit rod will directly translate outward, forming an staggered expansion between the two horseshoes.

[0019] The present invention is further configured as follows: the reset member is two tension springs, one end of the two tension springs is fixedly connected to the two ends of one of the horseshoes, and the other end of the two tension springs is fixedly connected to the two ends of another one of the horseshoes.

[0020] By adopting the above technical solution, the horseshoe can be effectively reset through the two tension springs to prevent the horseshoe from driving the brake pad to continuously contact the brake drum.

[0021] The present invention is further configured as follows: a plurality of mounting holes are provided on the chassis.

[0022] By adopting the above technical solution, such an arrangement makes it easy to install the bottom plate on a two-wheel or three-wheel electric vehicle through the installation hole.

[0023] The present invention is further configured as follows: each of the limit rods is provided with a top cap.

[0024] By adopting the above technical solution, the horseshoe can be effectively prevented from sliding out in the front-back direction on the chassis.

[0025] The present invention is further configured as follows: a plurality of reinforcing ribs are provided on the two horseshoes.

[0026] By adopting the above technical solution, the overall strength of the horseshoe can be effectively increased.

[0027] Beneficial effects obtained:

[0028] This device is a fully-expandable drum brake device, which can effectively drive the driving component to rotate through the rotation of the swing arm. When the driving component rotates, it can effectively drive the two opposing horseshoes to expand, and make the brake pads on the two horseshoes all abut against the inner wall of the brake drum. Due to the increase in the contact area of ​​the brake pads, the braking effect is greatly improved compared with the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0030] Figure 2 This is an exploded schematic diagram of the overall structure of Example 1 of the present invention;

[0031] Figure 3 for Figure 2 A schematic diagram of the structure at A;

[0032] Figure 4 It is a front structural schematic diagram of implementation 1 of the present invention;

[0033] Figure 5 It is a front structural schematic diagram of implementation 2 of the present invention;

[0034] Figure 6 It is a front structural schematic diagram of implementation 3 of the present invention.

[0035] In the above drawings: 1. chassis; 2. swing arm; 3. horseshoe; 4. brake pad; 5. connecting rod; 6. half gear; 7. abutment ring; 8. connecting sleeve; 9. roller; 10. limit groove; 11. limit rod; 12. tension spring; 13. mounting hole; 14. reinforcing rib; 15. abutment block. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] Embodiment 1:

[0038] Reference Figure 1 to Figure 4 The present invention is a fully-expandable drum brake device, comprising a chassis 1 and a swing arm 2, the swing arm 2 is rotatably mounted on the chassis 1, a plurality of mounting holes 13 are provided on the chassis 1 for easy connection with a two-wheel or three-wheel electric vehicle, two horseshoes 3 are disposed opposite to each other on the chassis 1, a plurality of reinforcing ribs 14 are provided on the two horseshoes 3, and brake pads 4 are fixedly disposed on the sides of the two horseshoes 3 facing away from each other. It is worth mentioning that in actual use, a brake drum will be installed on the chassis 1, and is used to abut against the expanded brake pads 4 to achieve a braking effect.

[0039] like Figure 2 and Figure 3As shown, the chassis 1 is provided with a driving assembly for driving the two horseshoes 3 to expand with the swing of the swing arm 2, the driving assembly includes a connecting rod 5, a half gear 6 and an abutting ring 7 with a tooth groove on the side wall, a connecting sleeve 8 is rotatably penetrated on the chassis 1, one end of the connecting sleeve 8 is fixedly connected to the swing arm 2, the connecting rod 5 is fixedly arranged at the other end of the connecting sleeve 8, the half gear 6 is fixedly arranged at the end of the connecting rod 5 away from the swing arm 2, the abutting ring 7 is rotatably arranged on the chassis 1 and located between the two horseshoes 3, the abutting ring 7 abuts against the inner walls of the two horseshoes 3 respectively, and the abutting ring 7 and the half gear 6 are meshed with each other. Such an arrangement can effectively drive the connecting sleeve 8 to rotate on the chassis 1 by driving the swing arm 2 to rotate, and when the connecting sleeve 8 rotates, it will further drive the connecting rod 5 and the half gear 6 at the end of the connecting rod 5 to rotate, and drive the abutting ring 7 meshed with the half gear 6 to rotate on the bottom plate. Two abutting members are provided on the abutting ring 7, and roller shafts 9 are rotatably provided on the inner wall of each horseshoe 3. The two abutting members abut against the two roller shafts 9 respectively, and the horseshoe 3 is expanded on the chassis 1 through the abutment between the abutting members and the corresponding roller shafts 9. Limiting grooves 10 are respectively provided at both ends of the opposite side of the two horseshoes 3, and four limiting rods 11 with top caps are provided on the chassis 1. The four limiting rods 11 are parallel to each other and correspond to each other. Every two limiting rods 11 are respectively slidably provided in the limiting grooves 10 at both ends of each horseshoe 3, which can effectively limit the expansion position and direction of the horseshoe 3 on the chassis 1.

[0040] like Figure 4 As shown, the abutment member is two abutment blocks 15, and the two abutment blocks 15 are adjacent to form a V-shaped angle, and the roller shaft 9 is located between the V-shaped angles of the two abutment blocks 15. This arrangement can achieve the abutment of the abutment blocks 15 and the roller shaft 9 no matter which direction the swing arm 2 rotates during installation, and the horseshoe 3 can be expanded on the chassis 1. The width of the limiting groove 10 is the same as the width of the limiting rod 11, so that the horseshoe 3 can only move in a straight line away from the abutment ring 7. The same width of the limiting groove 10 and the limiting rod 11 means that the limiting rod 11 can only slide along the extension direction of the side wall of the limiting groove 10.

[0041] like Figure 1 and Figure 2 As shown, a reset member is provided between the two horseshoes 3, and the reset member is two tension springs 12, one end of the two tension springs 12 is respectively fixedly connected to the two ends of one of the horseshoes 3, and the other ends of the two tension springs 12 are respectively fixedly connected to the two ends of the other horseshoe 3. In this way, the tension springs 12 at the ends of the two horseshoes 3 are arranged to achieve the reset of the horseshoes 3 on the chassis 1, preventing the brake pads 4 from continuously abutting against the brake drum.

[0042] Working principle:

[0043] This device is a fully-expandable drum brake device, which is mainly used to be installed on two-wheel or three-wheel electric vehicles and brake them. When in use, the swing arm 2 is driven to rotate, driving the connecting sleeve 8 to rotate on the chassis 1. When the connecting sleeve 8 rotates, it will further drive the connecting rod 5 and the half gear 6 at the end of the connecting rod 5 to rotate, and then drive the abutment ring 7 meshing with the half gear 6 to rotate on the bottom plate. When the abutment ring 7 rotates, the abutment block 15 will abut against the corresponding roller shaft 9, so that the horseshoe 3 is set along the position of the limit groove 10 and the limit rod 11 on the chassis 1, and expands in a straight line direction, so that the entire outer surface of the brake pad 4 abuts against the brake drum to achieve braking. Through the tension spring 12 at the end of the two horseshoes 3, the horseshoe 3 is reset on the chassis 1 after the swing arm 2 is released, and the braking state is released.

[0044] Embodiment 2:

[0045] The abutting member is an abutting block 15 , which rotates toward the corresponding roller shaft 9 . The width of the limiting groove 10 is the same as the width of the limiting rod 11 .

[0046] The difference between Example 2 and Example 1 is that an abutment block 15 provided in an abutment member is one piece, and the side of the abutment block 15 that rotates toward the roller shaft 9 is an inclined surface, which facilitates the roller shaft 9 to roll on the abutment block 15. Although Example 2 can only rotate in one direction, it can achieve the same braking effect as Example 1 while saving production costs.

[0047] Example 3

[0048] The abutment member is an abutment block 15, which rotates toward the corresponding roller shaft 9. The width of the limit groove 10 on the side away from the rotation direction of the abutment block 15 is greater than the width of the corresponding limit rod 11, and the width of the limit groove 10 on the side facing the rotation direction of the abutment block 15 is the same as the width of the corresponding limit rod 11.

[0049] The difference between Example 3 and Example 1 is that: the abutment block 15 provided in one abutment member is one piece, and the side of the abutment block 15 facing the rotation of the roller shaft 9 is also an inclined surface for facilitating the rolling of the roller shaft 9. By setting the width of one limiting groove 10 on the horseshoe 3 to be greater than the width of the limiting rod 11, and the width of the other limiting groove 10 is the same as the width of the limiting rod 11, when the abutment block 15 is arranged to abut the roller shaft 9, the end of the horseshoe 3 whose upper limiting groove 10 width is greater than the limiting rod 11 moves outward and rotates slightly, and the other end moves outward in a straight line. At this time, the brake pad 4 at one end of the horseshoe 3 that rotates will first contact the brake drum for braking, and the two horseshoes 3 will have a staggered expansion effect when moving. Compared with Example 1, the braking effect of Example 3 is slightly worse, and it is mainly used for installation on two-wheel electric vehicles.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A full-expansion drum brake device, comprising a chassis (1) and a swing arm (2), wherein the swing arm (2) is rotatably mounted on the chassis (1). Features: Two horseshoes (3) are arranged opposite to each other on the chassis (1), and brake pads (4) are fixedly arranged on the sides of the two horseshoes (3) facing away from each other. A driving component is arranged on the chassis (1) for driving the two horseshoes (3) to expand as the swing arm (2) swings, and a reset component is also arranged between the two horseshoes (3).

2. A full expansion drum brake device according to claim 1, Features: The driving assembly comprises a connecting rod (5), a half gear (6) and an abutment ring (7) with a tooth groove on the side wall. A connecting sleeve (8) is rotatably provided on the chassis (1). One end of the connecting sleeve (8) is fixedly connected to the swing arm (2). The connecting rod (5) is fixed to the other end of the connecting sleeve (8). The half gear (6) is fixed to the end of the connecting rod (5) away from the swing arm (2). The abutment ring (7) is rotatably provided on the chassis (1) and is located between the two horseshoes (3). The abutment ring (7) abuts against the inner walls of the two horseshoes (3) respectively, and the abutment ring (7) and the half gear (6) are meshed with each other.

3. A full expansion drum brake device according to claim 2, Features: The abutment ring (7) is provided with two abutment members, and a roller shaft (9) is rotatably provided on the inner wall of each shoe (3). The two abutment members abut against the two roller shafts (9) respectively. Limiting grooves (10) are respectively provided at two ends of opposite sides of the two shoes (3). Four limiting rods (11) are provided on the chassis (1), and the four limiting rods (11) are respectively and correspondingly slidably arranged in the four limiting grooves (10).

4. A full expansion drum brake device according to claim 3, Features: The abutment member is two abutment blocks (15), the two abutment blocks (15) are adjacent to each other to form a V-shaped angle, the roller shaft (9) is located between the V-shaped angles of the two abutment blocks (15), and the width of the limiting groove (10) is the same as the width of the limiting rod (11).

5. A full expansion drum brake device according to claim 3, Features: The abutment member is an abutment block (15), the abutment block (15) rotates toward the corresponding roller shaft (9), and the width of the limiting groove (10) is the same as the width of the limiting rod (11).

6. A full expansion drum brake device according to claim 3, Features: The abutment member is an abutment block (15), and the abutment block (15) rotates toward the corresponding roller shaft (9). The width of the limiting groove (10) on the side away from the rotation direction of the abutment block (15) is greater than the width of the corresponding limiting rod (11), and the width of the limiting groove (10) on the side facing the rotation direction of the abutment block (15) is the same as the width of the corresponding limiting rod (11).

7. A full expansion drum brake device according to claim 1, Features: The reset member is two tension springs (12), one end of the two tension springs (12) is respectively fixedly connected to the two ends of one of the horseshoes (3), and the other end of the two tension springs (12) is respectively fixedly connected to the two ends of another of the horseshoes (3).

8. A full expansion drum brake device according to claim 1, Features: The chassis (1) is provided with a plurality of mounting holes (13).

9. A full expansion drum brake device according to claim 3, Features: Each of the limiting rods (11) is provided with a top cap.

10. A full expansion drum brake device according to claim 1, Features: A plurality of reinforcing ribs (14) are provided on the two horseshoes (3).

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