Parking power-assisted hand brake

Abstract

A parking power-assisted hand brake is characterized in that a power-assisted tension spring and a swing arm fixedly arranged on a hand brake fixing seat are additionally arranged on the basis of an existing hand brake structure, the swing arm is in limiting connection with a hand brake rod, and the tension spring is arranged between the hand brake rod and the swing arm; in the process of pulling the hand brake, the tension spring firstly provides primary assistance for the hand brake, and then provides secondary assistance for the hand brake through the swing arm, so that the force of pulling the hand brake when a cargo truck and an agricultural tractor stop is greatly reduced; the parking power-assisted hand brake has the advantages of being small in size, simple in structure, good in power-assisted effect and low in cost, and can be popularized and applied to hand brake systems of heavy vehicles such as cargo trucks and agricultural tractors in a large scale.

Description

Technical Field

[0001] The utility model relates to a hand brake for auxiliary parking braking of a vehicle, in particular to a parking power-assisting hand brake. Background Art

[0002] When a motor vehicle is parked, the handbrake is used to put the vehicle in a braking state to prevent the vehicle from moving and causing danger when parked; the existing handbrake is to generate friction by pulling the handbrake lever to drive the brake shoe close to the brake drum or brake disc. The magnitude of the handbrake braking force is related to the positive pressure of the brake shoe pressing on the brake drum or brake disc. Therefore, in order to make the handbrake brake reliably, a large pulling force is required when pulling the handbrake; for ordinary family cars, due to the light weight of the vehicle itself, the force to pull the existing handbrake is acceptable, but for vehicles with heavy weight such as heavy trucks and agricultural tractors, pulling the handbrake requires great force. In order to ensure that the driver can pull the handbrake, the handbrake structure is usually designed to be large in size, occupying more space in the car.

[0003] The utility model patent with authorization number CN219134134U discloses a mechanical power-assisted handbrake system, which provides mechanical power assistance for the handbrake by driving a small-tooth difference planetary reducer through a power-assisted motor, thereby achieving the purpose of reducing the structural size of the handbrake; however, the technical solution disclosed by the utility model patent has a complex structure and high cost, and is not suitable for large-scale promotion and application. Utility Model Content

[0004] In order to overcome the deficiencies in the background technology, the utility model discloses a parking power-assisting handbrake, which adds a power-assisting mechanism on the basis of the existing handbrake structure; the power-assisting mechanism includes a tension spring and a swing arm; the swing arm is fixedly arranged on the handbrake lever and is movably connected with the handbrake lever in a limiting position, and the tension spring is arranged between the handbrake lever and the swing arm; in the process of pulling the handbrake, the tension spring first provides a primary power assist for the handbrake, and then provides a secondary power assist for the handbrake through the swing arm, thereby greatly reducing the force required to pull the handbrake of a heavy-duty truck or an agricultural tractor when parking.

[0005] In order to achieve the purpose of the utility model, the utility model adopts the following technical scheme: a parking power-assisting handbrake, including a handbrake lever and a handbrake fixing seat, the handbrake lever and the handbrake fixing seat are hingedly connected; a power-assisting mechanism is arranged between the handbrake lever and the handbrake fixing seat; the power-assisting mechanism includes a tension spring and a swing arm; the swing arm is fixedly arranged on the handbrake lever, and is movably connected with the handbrake lever in a limited position, and the tension spring is arranged between the handbrake lever and the swing arm; in the process of pulling the handbrake, the tension spring first provides a primary power assist for the handbrake, and then provides a secondary power assist for the handbrake through the swing arm, thereby greatly reducing the force of pulling the handbrake of a heavy-duty truck or an agricultural tractor when parking.

[0006] Furthermore, the power-assisting mechanism includes a power-assisting gear plate, a swing arm gear plate, and a tension spring; the power-assisting gear plate is fixedly arranged on the handbrake lever, the swing arm gear plate is hingedly arranged on the handbrake fixing seat, and the power-assisting gear plate and the swing arm gear plate are meshingly connected; the tension spring is arranged between the handbrake lever and the swing arm gear plate; when the handbrake is pulled, the tension spring first provides a primary power-assisting function for the handbrake, and then provides a secondary power-assisting function for the handbrake through the meshingly connected power-assisting gear plate and the swing arm gear plate, thereby greatly reducing the force required to pull the handbrake when parking a heavy-duty truck or agricultural tractor.

[0007] Preferably, the power assist mechanism includes a swing arm, a connecting rod, and a tension spring; the connecting rod is hinged on the handbrake lever, the swing arm is hinged on the handbrake fixing seat, and the connecting rod is hingedly connected to the swing arm; the tension spring is arranged between the handbrake lever and the swing arm; when the handbrake is pulled, the tension spring first provides a primary assist to the handbrake, and then provides a secondary assist to the handbrake through the hinged connecting rod and the swing arm, thereby greatly reducing the force required to pull the handbrake when parking a heavy truck or agricultural tractor.

[0008] Preferably, the power assist mechanism includes a detent pin, a swing arm fork, and a tension spring; the detent pin is fixedly arranged on the handbrake lever, the swing arm fork is hingedly arranged on the handbrake fixing seat, the swing arm fork is provided with a detent slot, and the detent pin is movably arranged in the detent slot; the tension spring is arranged between the handbrake lever and the swing arm fork; when the handbrake is pulled, the tension spring first provides a primary power assist to the handbrake, and then provides a secondary power assist to the handbrake through the detent pin and the swing arm fork, thereby greatly reducing the force required to pull the handbrake when parking a heavy truck or agricultural tractor.

[0009] Furthermore, the connection point between the tension spring and the handbrake lever is located outside the hinged connection point between the handbrake lever and the handbrake fixing seat; the connection point between the tension spring and the swing arm tooth plate or the swing arm or the swing arm fork is located outside the hinged point between the handbrake fixing seat and the swing arm tooth plate or the swing arm or the swing arm fork; the purpose of the above-mentioned structural setting is to increase the force arm of the tension spring when pulling the handbrake, thereby obtaining a greater power assistance effect.

[0010] Furthermore, in the initial state, the connecting line of the connection point between the tension spring and the handbrake lever, and the connection point between the tension spring and the swing arm tooth plate or the swing arm or the swing arm fork are located on the lower side of the hinged connection point between the handbrake lever and the handbrake fixing seat, and the hinged point between the handbrake fixing seat and the swing arm tooth plate or the swing arm or the swing arm fork; the above-mentioned structural arrangement ensures that when the handbrake is in the initial state, there is a torque acting in the opposite direction to the direction of pulling the handbrake, so that the handbrake can be maintained in its original position, preventing the handbrake from accidentally moving by itself under the assistance of the tension spring.

[0011] Furthermore, when the handbrake lever is pulled up, the connection point between the tension spring and the handbrake lever, and the connection point between the tension spring and the swing arm tooth plate or the swing arm or the swing arm fork are located on the upper side of the hinged connection point between the handbrake lever and the handbrake fixing seat, and the hinged point between the handbrake fixing seat and the swing arm tooth plate or the swing arm or the swing arm fork; when the handbrake is in the above state, the tension spring generates a torque in the same direction as that of pulling the handbrake, and this torque assists in pulling the handbrake, thereby reducing the force applied to pull the handbrake when parking a truck or agricultural tractor.

[0012] Furthermore, a pawl is hingedly provided in the handbrake lever, a ratchet plate is fixedly provided in the handbrake fixing seat, and the pawl is meshed and connected with the ratchet plate; a pawl lever is also movably provided in the handbrake lever, and the pawl lever is movably connected with the pawl; when the handbrake is pulled up, the pawl is meshed with the ratchet plate to put the handbrake in a locked state, preventing the handbrake from accidentally falling and causing the parking brake to fail; when the handbrake needs to be lowered, the pawl lever is pressed, and the pawl lever drives the pawl to disengage from the ratchet plate, releasing the locked state of the handbrake, so that the handbrake can be lowered smoothly.

[0013] Furthermore, the handbrake lever is also hingedly connected to an adjustment rod, which is connected to the brake shoe through a brake cable; when the handbrake is pulled, the adjustment rod moves upward, driving the brake shoe to press on the brake drum or brake disc through the brake cable.

[0014] Furthermore, a ratchet lever is sleeved with a ratchet lever return spring, and the return spring is used to drive the ratchet lever to return to its original position.

[0015] Due to the adoption of the technical scheme as described above, the utility model has the following beneficial effects: the utility model discloses a parking power-assisting handbrake, on the basis of the existing handbrake structure, with an additional power-assisting tension spring and a swing arm fixedly arranged on the handbrake fixing seat, the swing arm being limitedly connected to the handbrake rod, and the tension spring being arranged between the handbrake rod and the swing arm; in the process of pulling the handbrake, the tension spring first provides a primary power-assisting function for the handbrake, and then provides a secondary power-assisting function for the handbrake through the swing arm, thereby greatly reducing the force required to pull the handbrake of a heavy-duty truck or agricultural tractor when parking; the parking power-assisting handbrake has the advantages of small size, simple structure, good power-assisting effect and low cost, and can be widely promoted and applied in the handbrake systems of heavy-duty trucks, agricultural tractors and other vehicles with heavy weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the appearance of the parking assist handbrake of the first embodiment;

[0017] Figure 2 This is a schematic diagram of the internal structure of the parking assist handbrake;

[0018] Figure 3 This is a schematic diagram of the initial state of the parking assist handbrake of Embodiment 1;

[0019] Figure 4This is a schematic diagram of the parking assist handbrake in the first embodiment when it is pulled up;

[0020] Figure 5 This is a schematic diagram of the force analysis of the parking assist handbrake in the initial state of the first embodiment;

[0021] Figure 6 This is a schematic diagram of force analysis of the parking assist handbrake in the pulled-up state according to the first embodiment;

[0022] Figure 7 This is a schematic diagram of the initial state of the parking assist handbrake of the second embodiment;

[0023] Figure 8 This is a schematic diagram of the parking assist handbrake in the second embodiment when it is pulled up;

[0024] Fig. 9 This is a schematic diagram of the initial state of the parking assist handbrake of Embodiment 3;

[0025] Fig.10 This is a schematic diagram of the parking assist handbrake in the third embodiment when it is pulled up;

[0026] In the figure: 1. handbrake lever; 2. handbrake fixing seat; 3. adjustment rod; 4. power-assisting tooth plate; 5. swing arm tooth plate; 6. tension spring; 7. ratchet plate; 8. pawl; 9. ratchet lever; 10. ratchet lever return spring; 11. swing arm; 12. connecting rod; 13. pull pin; 14. swing arm fork; 15. articulated shaft B; 16. articulated shaft A; 17. articulated shaft C; 18. spring hanging column A; 19. spring hanging column B. DETAILED DESCRIPTION

[0027] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0028] See the instruction manual Figure 1 , 2 : The parking power handbrake includes a handbrake lever 1 and a handbrake fixing seat 2, and the handbrake lever 1 and the handbrake fixing seat 2 are hingedly connected through an articulated shaft A16; see the attached manual Figure 1: A pawl 8 is hingedly provided in the handbrake lever 1 through an articulated axis, and a ratchet plate 7 is fixedly provided in the handbrake fixing seat 2 through an articulated axis B15 and an articulated axis A16 (the articulated axis B15 and the articulated axis A16 are fixedly connected to the handbrake fixing seat 2), and a ratchet plate 7 is provided with ratchet teeth, and the pawl 8 is meshed and connected with the ratchet plate 7; a pawl lever 9 is also movably provided in the handbrake lever 1, and a hook head is provided at the right end of the pawl lever 9, and the hook head is movably connected with the pawl 8. When the pawl lever 9 moves to the right, the hook head drives the pawl 8 to rotate around its articulated axis, so that the pawl 8 and the ratchet plate 7 are meshed and connected. The ratchet plate 7 is disengaged; a ratchet lever return spring 10 is sleeved on the ratchet lever 9, and the return spring 10 is used to drive the ratchet lever 9 to return to its original position; the handbrake lever 1 is hingedly connected to the adjustment rod 3 through the hinge axis C17, and the adjustment rod 3 is connected to the brake shoe through the brake cable. When the handbrake lever 1 is pulled up around the hinge axis A16, the adjustment rod 3 moves upward with the handbrake lever 1, and drives the brake shoe to press on the brake drum or brake disc by driving the brake cable, so as to realize parking brake; the power assist mechanism is arranged between the handbrake lever 1 and the handbrake fixing seat 2; Embodiment 1:

[0029] See the instruction manual Figure 1 The power-assisting mechanism comprises a power-assisting tooth plate 4, a swing arm tooth plate 5 and a tension spring 6; the power-assisting tooth plate 4 is fixedly arranged on the front and rear sides of the handbrake lever 1 by welding (or riveting), the swing arm tooth plate 5 is hingedly arranged on the front and rear sides of the handbrake fixing seat 2 by a hinge shaft B15, gear teeth are arranged at the opposite positions of the power-assisting tooth plate 4 and the swing arm tooth plate 5, and the power-assisting tooth plate 4 and the swing arm tooth plate 5 are meshedly connected by the gear teeth; a spring hanging column B19 is fixedly arranged on the handbrake lever 1 by welding (or riveting), a spring hanging column A18 is fixedly arranged on the swing arm tooth plate 5 by welding (or riveting), and the tension spring 6 is hung between the spring hanging columns B19 and A18 by hooks arranged at both ends; wherein the spring hanging column B19 is located on the left side of the hinge shaft A16, and wherein the spring hanging column A18 is located on the right side of the hinge shaft B15; see the attached part of the specification Figure 3 : In the initial state of the parking brake, the line L connecting the spring column A18 and the spring column B19 is located below the hinge axis B15 and the hinge axis A16. Figure 5 At this time, the handbrake lever 1 is subjected to the tension force F1 of the tension spring to generate a counterclockwise torque M1, and the swing arm toothed plate 5 is subjected to the tension force F2 of the tension spring (F2 and F1 are both tension forces of the tension spring 6, equal in magnitude and opposite in direction) to generate a clockwise torque M2. The superposition of M1 and M2 acts on the handbrake lever 1, so that the handbrake lever 1 remains in the original position, preventing the handbrake lever 1 from accidentally moving by itself under the assistance of the tension spring; see the attached manual Figure 4 : When the parking brake is pulled up, the line L connecting the spring column A18 and the spring column B19 is located on the upper side of the hinge shaft B15 and the hinge shaft A16. Figure 6At this time, the handbrake lever 1 is acted upon by the tension force F1' of the tension spring to generate a counterclockwise primary assisting torque M1', and the swing arm toothed plate 5 is acted upon by the tension force F2' of the tension spring (F2' and F1' are both tension forces of the tension spring 6, which are equal in magnitude and opposite in direction) to generate a clockwise torque M2'. M1' and M2' are superimposed on the handbrake lever 1 to form a secondary assisting torque, which is the same as the torque applied by the operator when pulling up the handbrake lever 1, thereby reducing the force of the heavy-duty truck or agricultural tractor to pull up the handbrake when parking. Embodiment 2:

[0030] See the instruction manual Figure 7 , 8 : The power-assisting mechanism includes a swing arm 11, a connecting rod 12, and a tension spring 6; the connecting rod 12 is hinged on the handbrake lever 1, the swing arm 11 is hinged on the handbrake fixing seat 2 through a hinge shaft B15, and the connecting rod 12 and the swing arm 11 are hingedly connected; the tension spring 6 is hung between a spring hanging column B19 and a spring hanging column A18 through hooks arranged at both ends; the spring hanging column B19 is located on the left side of the hinge shaft A16, and the spring hanging column A18 is located on the right side of the hinge shaft B15; the force condition of the parking power-assisting handbrake in the initial state and the pulled-up state is the same as that in Example 1. Embodiment three:

[0031] See the instruction manual Fig. 9 , 10 : The power-assisting mechanism includes a detent pin 13, a swing arm fork 14, and a tension spring 6; the detent pin 13 is fixedly arranged on the handbrake lever 1, the swing arm fork 14 is hingedly arranged on the handbrake fixing seat 2, the swing arm fork 14 is provided with a detent slot, and the detent pin 13 is movably arranged in the detent slot; the tension spring 6 is hung between the spring hanging column B19 and the spring hanging column A18 through hooks arranged at both ends; the spring hanging column B19 is located on the left side of the hinge shaft A16, and the spring hanging column A18 is located on the right side of the hinge shaft B15; the parking power-assisting handbrake is in the initial state and the pulled-up state, and its force condition is the same as that of the first embodiment.

[0032] The following embodiment is used as an example to specifically describe the forces of the parking assist handbrake in the original state and the pulled-up state:

[0033] See the instruction manual Figure 2 , 5: In the original state, the line L connecting the spring hanging column A18 and the spring hanging column B19 is located at the lower side of the hinge axis B15 and the hinge axis A16; the handbrake lever 1 is subjected to the tension F1 (lever arm is L1) of the tension spring 6 and the initial tension W1 (lever arm is Lw) of the adjustment lever 3, and the swing arm toothed plate 5 is subjected to the tension F2 (lever arm is L2, F1 and F2 are equal in magnitude and opposite in direction) of the tension spring 6. At this time, the parking clutch is engaged, and the handbrake lever 1 is subjected to the counterclockwise torque M1=F1*L1, Mw1=W1*Lw , the swing arm toothed plate 5 is subjected to a clockwise moment M2=F2*L2; the clockwise moment M2 exerted on the swing arm toothed plate 5 is transmitted to the handbrake lever 1 through meshing with the power-assisting toothed plate 4, so that a counterclockwise moment M2 is formed on the handbrake lever 1, that is, at this time, the handbrake lever 1 is subjected to three counterclockwise moments of M1, M2, and Mw1 superimposed on each other, and the above counterclockwise moment keeps the handbrake lever 1 in its original position; when the handbrake lever 1 is pulled upward by hand in the original state, the three counterclockwise moments M1, M2, and Mw1 need to be overcome, as shown in the attached manual Figure 5 It can be seen that at this time, the force arms L1 and L2 are both small, so the moments M1 and M2 are also small; in addition, at this time, the adjustment rod 3 does not need to pull the parking clutch, so W1 is also small, and the corresponding moment Mw1 is also small, so only a small force is needed to pull the handbrake lever 1 by hand;

[0034] See the instruction manual Figure 4 , 6 :As the handbrake lever 1 rotates clockwise around the hinge axis A16, the connecting line L of the spring hanging column A18 and the spring hanging column B19 gradually passes over the hinge axis B15 and the hinge axis A16 and begins to be located on the upper side; at this time, the handbrake lever 1 is subjected to the pulling force Fs of the hand (the lever arm is the distance Ls from the hand to the hinge axis A16), the pulling force F1' of the tension spring 6 (the lever arm is L1'), and the pulling force W2 of the adjusting rod 3 (the lever arm is Lw'), and the swing arm toothed plate 5 is subjected to the pulling force F2' of the tension spring 6 (the lever arm is L2', F1' and F2' are equal in magnitude and opposite in direction), at this time, the parking clutch is engaged, and the handbrake lever 1 is subjected to the clockwise torque Ms=Fs*Ls, M1'=F 1'*L1' and counterclockwise torque Mw2=W2*Lw', the swing arm toothed plate 5 is subjected to counterclockwise torque M2'=F2'*L2'; the counterclockwise torque M2' subjected to the swing arm toothed plate 5 is transmitted to the handbrake lever 1 through meshing with the power-assisting toothed plate 4, so that a clockwise torque M2' is formed on the handbrake lever 1, that is, at this time, the handbrake lever 1 is subjected to three superimposed clockwise torques Ms, M1', M2' and one counterclockwise torque Mw2, and the three superimposed clockwise torques Ms, M1', M2' overcome the counterclockwise torque Mw and drive the adjusting rod 3 to move upward, and at this time, the clockwise torques M1' and M2' form a power to pull the handbrake lever 1 upward;

[0035] As the angle β at which the handbrake lever 1 is pulled upward increases, the lever arms L1' and L2' gradually increase (F1' and F2' gradually decrease, but the decrease is less than the increase of L1' and L2'). Therefore, the moments M1' and M2' increase with the increase of the upward angle β within the range of the pull-up angle β being less than 45°. The increased torque overcomes the gradually increasing counterclockwise torque Mw2 (the driving force of the parking clutch gradually increases with the movement stroke), so that the force pulling the handbrake lever 1 upward is always maintained within a smaller range, thereby greatly reducing the force required to pull the handbrake lever 1 when parking a truck or agricultural tractor.

[0036] The parts not described in detail in this utility model are prior art.

Claims

1. A parking assist handbrake, comprising a handbrake lever (1) and a handbrake fixing seat (2), wherein the handbrake lever (1) and the handbrake fixing seat (2) are hingedly connected; wherein: A power-assisting mechanism is arranged between the handbrake lever (1) and the handbrake fixing seat (2); the power-assisting mechanism comprises a tension spring (6) and a swing arm; the swing arm is fixedly arranged on the handbrake lever (1) and is movably connected to the handbrake lever (1) in a limited position; the tension spring (6) is arranged between the handbrake lever (1) and the swing arm.

2. The parking assist handbrake according to claim 1 is characterized in that: The power-assisting mechanism comprises a power-assisting tooth plate (4), a swing arm tooth plate (5), and a tension spring (6); the power-assisting tooth plate (4) is fixedly arranged on the handbrake lever (1), the swing arm tooth plate (5) is hingedly arranged on the handbrake fixing seat (2), and the power-assisting tooth plate (4) and the swing arm tooth plate (5) are meshingly connected; and the tension spring (6) is arranged between the handbrake lever (1) and the swing arm tooth plate (5).

3. The parking assist handbrake according to claim 1 is characterized in that: The assist mechanism comprises a swing arm (11), a connecting rod (12), and a tension spring (6); the connecting rod (12) is hingedly arranged on the handbrake rod (1), the swing arm (11) is hingedly arranged on the handbrake fixing seat (2), and the connecting rod (12) and the swing arm (11) are hingedly connected; the tension spring (6) is arranged between the handbrake rod (1) and the swing arm (11).

4. The parking assist handbrake according to claim 1 is characterized in that: The assist mechanism comprises a detent pin (13), a swing arm fork (14), and a tension spring (6); the detent pin (13) is fixedly arranged on the handbrake lever (1), the swing arm fork (14) is hingedly arranged on the handbrake fixing seat (2), the swing arm fork (14) is provided with a detent slot, and the detent pin (13) is movably arranged in the detent slot; and the tension spring (6) is arranged between the handbrake lever (1) and the swing arm fork (14).

5. The parking assist handbrake according to claim 2, 3 or 4, characterized in that: The connection point between the tension spring (6) and the handbrake lever (1) is located outside the hinged connection point between the handbrake lever (1) and the handbrake fixing seat (2); the connection point between the tension spring (6) and the swing arm toothed plate (5) or the swing arm (11) or the swing arm fork (14) is located outside the hinged connection point between the handbrake fixing seat (2) and the swing arm toothed plate (5) or the swing arm (11) or the swing arm fork (14).

6. The parking assist handbrake according to claim 5 is characterized in that: In the initial state, the connecting line between the connection point between the tension spring (6) and the handbrake lever (1), and the connection point between the tension spring (6) and the swing arm tooth plate (5) or the swing arm (11) or the swing arm fork (14) is located below the hinge connection point between the handbrake lever (1) and the handbrake fixing seat (2), and the hinge point between the handbrake fixing seat (2) and the swing arm tooth plate (5) or the swing arm (11) or the swing arm fork (14).

7. The parking assist handbrake according to claim 5 is characterized in that: When the handbrake lever (1) is in a pulled-up state, a line connecting a connection point between the tension spring (6) and the handbrake lever (1), and a connection point between the tension spring (6) and a swing arm tooth plate (5) or a swing arm (11) or a swing arm shift fork (14) is located above a hinge connection point between the handbrake lever (1) and a handbrake fixing seat (2), and a hinge connection point between the handbrake fixing seat (2) and a swing arm tooth plate (5) or a swing arm (11) or a swing arm shift fork (14).

8. The parking assist handbrake according to claim 1 is characterized in that: A ratchet pawl (8) is hingedly arranged in the handbrake lever (1), a ratchet plate (7) is fixedly arranged in the handbrake fixing seat (2), and the ratchet pawl (8) is meshingly connected with the ratchet plate (7); a ratchet lever (9) is also movably arranged in the handbrake lever (1), and the ratchet lever (9) is movably connected with the ratchet pawl (8).

9. The parking assist handbrake according to claim 8 is characterized in that: The handbrake lever (1) is also hingedly connected to an adjustment pull rod (3).

10. The parking assist handbrake according to claim 9 is characterized in that: A ratchet lever return spring (10) is sleeved on the ratchet lever (9).

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