A dual spring assist assembly

Abstract

The utility model relates to the field of agricultural machinery, concretely relates to a double-spring power-assisted assembly, including pedal mechanism, primary power-assisted mechanism and secondary power-assisted mechanism, and the sleeve pipe is rotatably installed through pedal axle on pedal support, and the sleeve pipe is provided with pedal connecting portion and clutch connecting portion, the first tooth arm of primary power-assisted mechanism is connected with sleeve pipe, and the second tooth arm is connected with pedal support, and the first tooth arm and the second tooth arm transmission cooperation and are connected through the first tension spring, when power-assisted line is below the rotary center line, primary power-assisted mechanism drives clutch reset, when power-assisted line is above the rotary center line, primary power-assisted mechanism power-assisted driver treads pedal, the power-assisted piece of secondary power-assisted mechanism is connected with sleeve pipe, under the action of second tension spring, the power-assisted wheel on power-assisted rocker arm and power-assisted piece resist contact cooperation, when primary power-assisted mechanism exerts power-assisted effect, the power-assisted wheel and the power-assisted end surface of power-assisted piece resist contact cooperation and produce the moment of torque of drive sleeve pipe rotation, and play power-assisted effect.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery, specifically to a double-spring power assist assembly. Background Technology

[0002] Agricultural machinery, especially high-horsepower tractors, requires frequent gear shifting and clutch pedal operation. High-horsepower tractors have high power, and the driving force required to depress the clutch is also large. The resistance that the driver needs to overcome when depressing the clutch is also large, which can easily lead to driver fatigue and reduced work efficiency.

[0003] The Chinese utility model patent with application number 202422234107.4 is a clutch pedal assembly with power assist function developed by the applicant. It has the advantages of simple structure, high power assist efficiency, low cost and easy maintenance. After actual use testing, the applicant still has a lot of room for improvement in terms of reducing structural complexity and improving power assist efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a double-spring power assist assembly, which further reduces the structural complexity of the product and improves the power assist efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a double-spring power-assisted assembly, including a pedal mechanism, a primary power-assisted mechanism, and a secondary power-assisted mechanism. The pedal mechanism includes a pedal bracket, a pedal shaft, and a sleeve. The pedal shaft is mounted on the pedal bracket, and the sleeve is fitted onto the pedal shaft and rotates relative to the pedal shaft. The sleeve is provided with a pedal connecting part. The primary power-assisted mechanism includes a first toothed arm, a second toothed arm, a first tension spring, and a connecting arm. The first toothed arm is connected to the sleeve and is provided with a first tooth and a first operating part. The connecting arm is connected to the first operating part. The second toothed arm is connected to the pedal bracket and rotates relative to the pedal bracket. The second toothed arm is provided with a second tooth and a second operating part. The second toothed part engages with the first toothed part in a transmission connection. A first tension spring connects the second operating part and the connecting arm, generating a torque to drive the sleeve to rotate. The secondary assist mechanism includes an assist component, an assist rocker arm, and a second tension spring. The assist component is connected to the sleeve and has a mating end face, which includes a free-travel end face and an assist end face. The free-travel end face and the assist end face are in contact. The assist rocker arm is connected to the pedal bracket and rotates relative to the pedal bracket. An assist wheel is provided on the assist rocker arm. The second tension spring connects the assist rocker arm and the pedal bracket and makes the assist wheel abut against the mating end face. When the assist wheel travels between the free-travel end face and the assist end face and abuts against the assist end face, it generates a torque to drive the sleeve to rotate. The primary assist mechanism generates a torque to drive the sleeve back to its original position and, as needed, provides an assist effect simultaneously with the secondary assist mechanism after the sleeve rotates to a specific position. Compared with similar products in the prior art, it has a better assist effect and a simpler structure.

[0006] As an optional technical solution of this utility model, the rotation axis of the second toothed arm is parallel to the pedal shaft, the second operating part and the second toothed part are respectively on both sides of the rotation center of the second toothed arm, the line connecting the connection of the first tension spring and the connecting arm with the rotation center of the second toothed arm is the rotation center line, the line connecting the connection of the first tension spring and the connecting arm and the connection of the first tension spring and the second operating part is the assist connection line, the torque generated by the first tension spring when the assist connection line is above the rotation center line is opposite to the torque generated by the first tension spring when the assist connection line is below the rotation center line.

[0007] As an optional technical solution of this utility model, when the assist connection line coincides with the rotation center line, the assist wheel is at the junction of the idle stroke end face and the assist end face, and when the assist connection line is above the rotation center line, the torque of the first tension spring on the sleeve is in the same direction as the torque of the assist wheel on the sleeve.

[0008] As an optional technical solution of this utility model, the rotation axis of the power-assisted rocker arm, the rotation axis of the power-assisted wheel, and the axis of the pedal shaft are parallel. The idle stroke end face is an arc surface coaxial with the pedal shaft. The power-assisted rocker arm is pulled by the second tension spring and generates a force pointing towards the pedal shaft on the travel wheel that is in contact with the idle stroke end face. The power-assisted end face is an arc surface. The power-assisted rocker arm is pulled by the second tension spring and generates a force deviating from the pedal shaft on the travel wheel that is in contact with the power-assisted end face.

[0009] As an optional technical solution of this utility model, the assistive component is also provided with a limit stop, and the idle stroke end face, the assist end face and the limit stop are distributed circumferentially.

[0010] As an optional technical solution of this utility model, a connecting plate is provided on the pedal bracket, one end of the second tension spring is connected to the power rocker arm, and the other end is provided with a connecting rod. The connecting rod is connected to the connecting plate, and the connecting rod can move and adjust relative to the connecting plate along its own axial direction along the extension and retraction direction of the second tension spring.

[0011] As an optional technical solution of this utility model, the connecting plate is provided with a through hole, the connecting rod is provided with a thread, the connecting rod passes through the through hole and nuts are provided on both sides of the connecting rod.

[0012] As an optional technical solution of this utility model, the sleeve is provided with an in-situ baffle, and the pedal bracket is provided with an in-situ positioning plate. When the assist connection line is below the rotation center line, the first tension spring generates a torque to drive the sleeve to rotate in the in-situ position, and the sleeve drives the in-situ baffle to rotate towards the in-situ positioning plate.

[0013] As an optional technical solution of this utility model, the connecting arm is U-shaped, the connecting arm is arranged to bypass the sleeve, and the two ends of the connecting arm are respectively connected to the first operating part and the first tension spring.

[0014] Compared with the prior art, the advantages of this utility model are as follows: 1. The double-spring power assist assembly of this utility model has a simple and reasonable structure, good power assist effect, low cost and more convenient maintenance; 2. In actual use, under the action of the primary power assist mechanism, the pedal returns to its original position. When the driver presses the pedal, it overcomes the resistance of the first tension spring and drives the sleeve to rotate. When the power assist connection line of the primary power assist mechanism coincides with the rotation center line, the travel wheel of the secondary power assist mechanism is at the junction of the idle end face and the power assist end face. After the pedal is pressed again, the power assist connection line moves above the rotation center line. The primary power assist mechanism assists the sleeve to rotate, and the travel wheel and the power assist end face are in contact. The secondary power assist mechanism also assists the sleeve to rotate. Through double power assist, the resistance of the driver pressing the pedal is effectively reduced. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the double-spring power steering assembly; Figure 2 A schematic diagram of a double-spring power steering assembly omitting the secondary power steering mechanism; Figure 3 This is a schematic diagram of the primary assist mechanism along the pedal shaft axis; Figure 4 This is a schematic diagram of the primary assist mechanism along the pedal shaft axis; In the diagram: 11. Pedal bracket, 12. Pedal shaft, 13. Sleeve, 14. In-situ positioning plate, 15. In-situ baffle, 21. First toothed arm, 22. Second toothed arm, 23. First tension spring, 24. Connecting arm, 31. Assist component, 32. Assist rocker arm, 33. Second tension spring, 34. Assist wheel, 35. Connecting rod, 36. Connecting plate. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] like Figures 1-4As shown, a double-spring power-assisted assembly includes a pedal mechanism, a primary power-assist mechanism, and a secondary power-assist mechanism. The pedal mechanism includes a pedal bracket 11, a pedal shaft 12, and a sleeve 13. The pedal shaft 12 is mounted on the pedal bracket 11, and the sleeve 13 is fitted onto the pedal shaft 12 and rotates relative to it. The sleeve 13 and the pedal shaft 12 are connected by a bearing, ensuring that the sleeve 13 is coaxial with the pedal shaft 12 and can rotate stably relative to it. The pedal shaft 12 has a pedal connecting part and a clutch connecting part. The pedal connecting part connects to the pedal, and the clutch connecting part connects to the vehicle's clutch. When the driver depresses the pedal, the sleeve 13 rotates, causing the clutch to perform corresponding actions. During the driver's pedal depressing process, the primary and secondary power-assist mechanisms reduce the resistance of the pedal by assisting the rotation of the sleeve 13, thus achieving a power-assist effect.

[0019] Please see Figures 1-3 The primary assist mechanism includes a first gear arm 21, a second gear arm 22, a first tension spring 23, and a connecting arm 24. The first gear arm 21 is connected to the sleeve 13 and has a first toothed portion and a first operating portion, which are located at opposite ends of the first gear arm 21. The teeth of the first toothed portion are circumferentially distributed around the pedal shaft 12. The first operating portion can drive the first gear arm 21 and the sleeve 13 to rotate synchronously. The first operating portion is connected to the connecting arm 24. The second gear arm 22 is connected to the pedal bracket 11. The second gear arm 22 is connected to the pedal bracket 11 via a bearing or mounting pin. The second gear arm 22 can rotate relative to the pedal bracket, with its rotation axis parallel to the axis of the pedal shaft 12. The second gear arm 22 has a second operating portion and a second toothed portion, which are located on opposite sides of the rotation axis of the second gear arm 22. The teeth of the second toothed portion are circumferentially distributed around the rotation center of the second gear arm 22. The second operating portion can drive the second gear arm 22 to rotate.

[0020] Please see Figure 3 Along the axial direction of the pedal shaft 12, the first toothed arm 21 and the second toothed arm 22 are positioned correspondingly, with the first tooth and the second tooth engaging in transmission. The first tension spring 23 connects the second operating part and the connecting arm 24, and generates a torque to drive the sleeve 13 to rotate. For ease of description, the line connecting the connection point of the first tension spring 23 and the connecting arm 24 to the rotation center of the second toothed arm 22 is called the rotation center line, and the line connecting the connection point of the first tension spring 23 and the connecting arm 24 and the connection point of the first tension spring 23 and the second operating part is called the assist connection line.

[0021] Please see Figure 3In actual use, before the driver presses the pedal, the power assist cable is below the rotation center line. The first tension spring 23 generates a torque that drives the first toothed arm 21 and the sleeve 13 to rotate counterclockwise. Under the transmission action of the two teeth, the first toothed arm 21 and the sleeve 13 rotate counterclockwise, and the second toothed arm 22 rotates clockwise. The sleeve 13 is provided with a home position baffle 15, and the pedal bracket 11 is provided with a home position positioning plate 14. The torque generated by the first tension spring 23 drives the sleeve 13 to rotate counterclockwise and causes the home position baffle 15 to rotate toward the home position positioning plate 14. That is, when the power assist cable is below the rotation center line, the torque generated by the first tension spring 23 is used to drive the pedal to return to its original position. The connecting arm 24 is U-shaped and passes over the top of the sleeve 13. One end of the connecting arm 24 is connected to the first operating part, and the other end is connected to the first tension spring 23. The U-shaped connecting arm 24 ensures that when the pedal is reset to its original position, the assist line is below the rotation center line, thereby causing the torque generated by the first tension spring 23 to keep the pedal in its original position.

[0022] When the sleeve 13 and the second toothed arm 22 rotate so that the connection point between the first tension spring 23 and the second operating part is above the rotation center line, the assist connection line is also above the rotation center line. At this time, the torque generated by the first tension spring 23 is opposite to the torque generated by the first tension spring 23 when the assist connection line is below the rotation center line. Specifically, in actual use, when the driver presses the pedal, it overcomes the force of the first tension spring 23 and drives the sleeve 13 and the first toothed arm 21 to rotate clockwise. Under the transmission cooperation of the two teeth, the second toothed arm 22 rotates counterclockwise. The connection point between the first tension spring 23 and the second operating part continuously moves upward. When the connection point between the first tension spring 23 and the second operating part moves above the rotation center line, the assist connection line also moves above the rotation center line. At this time, the first tension spring 23 generates a torque that drives the second toothed arm 22 to rotate counterclockwise, and through the transmission of the two teeth, it generates a torque that drives the first toothed arm 21 and the sleeve 13 to rotate clockwise. Both of these torques are in the same direction as the driver pressing the pedal, thus achieving the effect of assisting in pedal pressing.

[0023] The secondary assist mechanism includes an assist component 31, an assist rocker arm 32, and a second tension spring 33. The assist component 31 is connected to the sleeve 13. The assist component 31 is provided with a mating end face. The assist component 31 rotates with the sleeve 13 and drives the mating end face to rotate around the axis of the sleeve 13. The mating end face includes a free stroke end face and an assist end face. Both the free stroke end face and the assist end face are arc surfaces and the two end faces are connected in the circumferential direction centered on the pedal shaft 12. The assist rocker arm 32 is connected to the pedal bracket 11. The assist rocker arm 32 is connected to the pedal bracket 11 through a bearing or mounting pin. The assist rocker arm 32 can rotate relative to the pedal bracket 11. The rotation axis of the assist rocker arm 32 is parallel to the axial direction of the pedal shaft 12. An assist wheel 34 is provided on the assist rocker arm 32. The axle of the assist wheel 34 is parallel to the axial direction of the pedal shaft 12. The assist wheel 34 can rotate relative to the assist rocker arm 32. In the axial direction of the pedal shaft 12, the assist wheel 34 corresponds to the position of the assist component 31. The second tension spring 33 connects the assist rocker arm 32 and the pedal bracket 11. Under the action of the second tension spring 33, during the process of the sleeve 13 driving the mating end face to rotate, the assist wheel 34 always abuts against the mating end face.

[0024] Please see Figure 4 The idle travel end face is an arc surface coaxial with the pedal shaft 12. When the sleeve 13 rotates to the point where the travel wheel abuts against the idle travel end face, the assist rocker arm 32 is pulled by the second tension spring 33 and exerts a force on the travel wheel pointing towards the pedal shaft 12. At this time, the force of the second tension spring 33 points towards the axis of the pedal shaft 12, so it does not produce the effect of driving the sleeve 13 to rotate. The assist end face is an arc surface, and the axis of the assist end face is below the pedal shaft 12. When the sleeve 13 rotates to the point where the travel wheel abuts against the assist end face, the assist rocker arm 32 is pulled by the second tension spring 33 and exerts a force deviating from the pedal shaft 12 through the travel wheel. At this time, the second tension spring 33 generates a torque that drives the sleeve 13 to rotate, and this torque is consistent with the direction in which the driver presses the pedal, thus achieving the effect of assisting the driver to press the pedal.

[0025] When the driver depresses the pedal and drives the sleeve 13 to rotate, during the first half of the pedal stroke, the assist line is below the rotation center line, and the assist wheel 34 is in contact with the idle end face. At this time, the pedal is in the idle stage, and the primary and secondary assist mechanisms do not produce an assist effect. When the assist line coincides with the rotation center line, the assist wheel 34 is at the junction of the idle end face and the assist end face. When the driver continues to depress the pedal and drives the sleeve 13 to rotate, when the assist line is above the rotation center line, the first tension spring 23 and the second tension spring 33 exert forces on the sleeve 13 in the same direction, generating a torque to drive the sleeve 13 to rotate, thus achieving an assist effect.

[0026] Please see Figure 4As a further implementation, the power assist component 31 is also provided with a limit stop. The idle travel end face, the power assist end face, and the limit stop are distributed circumferentially. When the driver presses the pedal, the sleeve 13 rotates. When the travel wheel comes into contact with the limit stop, the limit stop prevents the sleeve 13 from continuing to rotate. Through the cooperation between the travel wheel and the limit stop, and the cooperation between the in-situ baffle 15 and the in-situ positioning plate 14, the rotation range of the sleeve 13 can be limited.

[0027] As an optional implementation, a connecting plate 36 is provided on the pedal bracket 11. One end of the second tension spring 33 is connected to the power assist rocker arm 32, and the other end is provided with a connecting rod 35. The connecting rod 35 is connected to the connecting plate 36, allowing the second tension spring 33 to connect with the pedal bracket 11. The connecting rod 35 can be adjusted axially relative to the connecting plate 36 along the extension and retraction direction of the second tension spring 33. Adjusting the position of the connecting rod 35 axially allows for adjustment of the extension and retraction degree of the second tension spring 33, ensuring the effective contact between the traveling wheel and the power assist component 31. As a specific example, the connecting plate 36 is provided with a through hole, and the connecting rod 35 is provided with a thread. The connecting rod 35 passes through the through hole, and nuts are provided on both sides of the connecting plate 36. Adjusting the two nuts allows for adjustment of the position of the connecting rod 35 relative to the connecting plate 36.

[0028] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A double-spring power assist assembly, characterized in that: The system includes a pedal mechanism, a primary assist mechanism, and a secondary assist mechanism. The pedal mechanism includes a pedal bracket (11), a pedal shaft (12), and a sleeve (13). The pedal shaft (12) is mounted on the pedal bracket (11), and the sleeve (13) is fitted onto the pedal shaft (12) and rotates relative to the pedal shaft (12). A pedal connecting part is provided on the sleeve (13). The primary assist mechanism includes a first toothed arm (21), a second toothed arm (22), a first tension spring (23), and a connecting arm (24). The first toothed arm (21) is connected to the sleeve (13) and has a first tooth and a first operating part. The connecting arm (24) is connected to the first operating part. The second toothed arm (22) is connected to the pedal bracket (11) and rotates relative to the pedal bracket (11). The second toothed arm (22) has a second tooth and a second operating part. The second tooth and the first tooth are in a transmission engagement. The tension spring (23) connects the second operating part and the connecting arm (24) and generates a torque to drive the sleeve (13) to rotate. The secondary assist mechanism includes an assist component (31), an assist rocker arm (32), and a second tension spring (33). The assist component (31) is connected to the sleeve (13). The assist component (31) is provided with a mating end face, which includes an idle stroke end face and an assist end face. The idle stroke end face and the assist end face are connected. The assist rocker arm (32) is connected to the pedal bracket (11) and rotates relative to the pedal bracket (11). An assist wheel (34) is provided on the assist rocker arm (32). The second tension spring (33) connects the assist rocker arm (32) and the pedal bracket (11) and makes the assist wheel (34) abut against the mating end face. The assist wheel (34) travels between the idle stroke end face and the assist end face and generates a torque to drive the sleeve (13) to rotate when the assist wheel (34) abuts against the assist end face.

2. The double-spring power assist assembly according to claim 1, characterized in that: The rotation axis of the second toothed arm (22) is parallel to the pedal shaft (12). The second operating part and the second toothed part are respectively on both sides of the rotation center of the second toothed arm (22). The line connecting the connection point of the first tension spring (23) and the connecting arm (24) with the rotation center of the second toothed arm (22) is the rotation center line. The line connecting the connection point of the first tension spring (23) and the connecting arm (24) and the connection point of the first tension spring (23) and the second operating part is the assist line. When the assist line is above the rotation center line, the torque generated by the first tension spring (23) is opposite to the torque generated by the first tension spring (23) when the assist line is below the rotation center line.

3. The double-spring power assist assembly according to claim 2, characterized in that: When the assist line coincides with the rotation center line, the assist wheel (34) is at the junction of the idle end face and the assist end face. When the assist line is above the rotation center line, the torque of the first tension spring (23) on the sleeve (13) is in the same direction as the torque of the assist wheel (34) on the sleeve (13).

4. The double-spring power assist assembly according to claim 3, characterized in that: The rotation axis of the power-assisted rocker arm (32), the rotation axis of the power-assisted wheel (34), and the axis of the pedal shaft (12) are parallel. The idle stroke end face is an arc surface coaxial with the pedal shaft (12). The power-assisted rocker arm (32) is pulled by the second tension spring (33) and exerts a force on the travel wheel that is in contact with the idle stroke end face, pointing towards the pedal shaft (12). The power-assisted end face is an arc surface. The power-assisted rocker arm (32) is pulled by the second tension spring (33) and exerts a force on the travel wheel that is in contact with the power-assisted end face, deviating from the pedal shaft (12).

5. A double-spring power assist assembly according to claim 4, characterized in that: The assist component (31) is also provided with a limit stop, and the idle stroke end face, the assist end face and the limit stop are distributed in the circumferential direction.

6. A double-spring power assist assembly according to claim 4, characterized in that: A connecting plate (36) is provided on the pedal bracket (11). One end of the second tension spring (33) is connected to the power rocker arm (32), and the other end is provided with a connecting rod (35). The connecting rod (35) is connected to the connecting plate (36). The connecting rod (35) moves and adjusts relative to the connecting plate (36) along its own axis in the extension and retraction direction of the second tension spring (33).

7. A double-spring power assist assembly according to claim 6, characterized in that: The connecting plate (36) is provided with a through hole, the connecting rod (35) is provided with a thread, the connecting rod (35) passes through the through hole and nuts are provided on both sides of the connecting plate (36) on the connecting rod (35).

8. A double-spring power assist assembly according to claim 4, characterized in that: The sleeve (13) is provided with a home position baffle (15), and the pedal bracket (11) is provided with a home position positioning plate (14). When the power assist connection line is below the rotation center line, the first tension spring (23) generates a torque to drive the sleeve (13) to rotate in the home position, and the sleeve (13) drives the home position baffle (15) to rotate in the home position positioning plate (14).

9. A double-spring power assist assembly according to claim 4, characterized in that: The connecting arm (24) is U-shaped, and the connecting arm (24) is arranged around the sleeve (13). The two ends of the connecting arm (24) are respectively connected to the first operating part and the first tension spring (23).

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