Parking braking mechanism with variable lever ratio

Abstract

The utility model discloses a variable lever ratio parking braking mechanism which comprises a handle and a ratchet wheel plate, the top end of the ratchet wheel plate extends into the handle, a push rod assembly is arranged in the handle, an intermediate shaft is arranged on the ratchet wheel plate, the bottom end of the handle is fixedly connected to one end of the intermediate shaft, an inhaul cable guide plate is fixedly connected to the intermediate shaft, and an inhaul cable is connected to the inhaul cable guide plate. According to the parking braking mechanism with the variable lever ratio, the operation comfort is improved, the assembly difficulty is low, and the occupied space is small.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the parking brake handle field, concretely, the utility model relates to a parking brake mechanism of variable lever ratio. BACKGROUND

[0002] The parking brake handle is the control device for fixing the vehicle body on the ground without relative movement on the automobile. The existing parking brake handle adopts the fixed lever ratio structure, and according to the torque formula: input force F1 x input force arm L = output force F2 x output force arm R, the output force arm R of the parking brake handle with the fixed lever ratio structure is a certain value, along with the pulling of the parking brake handle assembly, the cable is lifted, and the output force F2 is continuously increased, so that the input force F1 is also proportionally increased, thereby affecting the operation comfort; for part of the parking brake handle with variable lever ratio, the structure is relatively complex, occupies large space, and the effect of reducing the input force F1 is limited.

[0003] The utility model patent with the publication number CN203496871U discloses a parking brake handle cover plate on March 26, 2014, which comprises a cover plate body for covering the parking brake handle assembly, an installation opening is formed in the cover plate body, an activity baffle is shielded on the installation opening, an opening is formed in the activity baffle for the brake handle body to pass through, and the activity baffle slides at the installation opening. The opening is moved to different parts of the installation opening. The parking brake handle cover plate cannot solve the above-mentioned technical problems. UTILITY MODEL CONTENT

[0004] The utility model aims at the shortage of prior art, provides a parking brake mechanism of variable lever ratio, which improves operation comfort, has low assembly difficulty and occupies small space.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] The parking brake mechanism of variable lever ratio comprises a handle and a ratchet plate, the top end of the ratchet plate extends into the handle, a push rod assembly is arranged in the handle, an intermediate shaft is arranged on the ratchet plate, the bottom end of the handle is fixedly connected to one end of the intermediate shaft, a cable guide plate is fixedly connected to the intermediate shaft, the cable guide plate is connected with a cable, the cable passes through the cable guide plate, and a balance block is connected to the end of the cable.

[0007] The push rod assembly comprises a push rod, a button is arranged at the top end of the handle, a spring is arranged between the button and the top end of the push rod, a pawl is movably connected to the bottom end of the push rod, a tooth plate is arranged at the top end of the ratchet plate, a displacement cavity is arranged at the bottom end of the handle, and the pawl and the tooth plate are arranged in the displacement cavity.

[0008] The intermediate shaft end is provided with a movable support, the ratchet plate and the movable support are oppositely arranged on both sides of the cable guide plate, the bottom of the ratchet plate and the movable support is provided with a vehicle floor, the vehicle floor is provided with a base, the bottom of the ratchet plate is bent to form a first ear plate, the bottom of the movable support is bent to form a second ear plate, the first ear plate and the second ear plate are both provided with two, the two first ear plates are respectively bolted to the vehicle floor and the base, and the two second ear plates are respectively bolted to the vehicle floor and the base.

[0009] The first ear plate is vertically arranged with the ratchet plate, and the first ear plate is located on the inner side of the ratchet plate; and the second ear plate is vertically arranged with the movable support, and the second ear plate is located on the inner side of the movable support.

[0010] The top end of the cable guide plate is provided with a pressing plate, the pressing plate presses the cable, the end of the cable extends out of the pressing plate, and the end of the cable is provided with a fastening bolt.

[0011] The bottom of the cable guide plate is provided with a guide groove, and the end of the cable guide plate is arc-shaped.

[0012] The base is in the shape of a Chinese character, the middle of the base is provided with a wire passing groove, and the two ends of the base are provided with fixing holes.

[0013] The handle is externally sleeved with a sheath.

[0014] The side of the cable guide plate is provided with a convex rib.

[0015] The technical effect of the utility model is: the variable lever ratio parking brake mechanism of the utility model, through the use of the cable guide plate, the rotation radius of the cable guide plate is a variable value, the change of the output force arm is realized, the operation force of the parking handle with fixed lever ratio is lower, the operation comfort is improved, the overall structure design is reasonable, the assembly difficulty is low, the occupied space is small, and the operation of the conventional variable lever ratio parking brake handle is more labor-saving. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present specification includes the following drawings, and the shown contents are respectively:

[0017] Fig. 1 is a structure exploded view of the variable lever ratio parking brake mechanism of the utility model;

[0018] Fig. 2 is a structure schematic view of the variable lever ratio parking brake mechanism of the utility model;

[0019] Fig. 3 is a structure schematic view of the installation of the parking brake handle assembly on the vehicle floor;

[0020] Fig. 4 is a structure schematic view of the cable guide plate of the utility model.

[0021] The figure is marked: 1, ratchet plate; 11, shaft hole; 12, tooth plate; 13, switch assembly; 131, screw; 14, bushing; 15, first ear plate; 16, anti-rebound rib; 2, handle; 21, push rod; 22, let go of the cavity; 23, sheath; 24, button; 25, pawl; 251, rivet; 26, spring; 3, cable guide plate; 31, guide groove; 32, pressing plate; 321, fastening hole; 33, fastening bolt; 34, protruding rib; 4, intermediate shaft; 5, movable support; 51, second ear plate; 6, base; 61, wire slot; 62, fixing hole; 7, cable; 8, counterweight; 9, fixing bolt; 10, vehicle body floor; F1, input force; F2, output force; L, input force arm; R, output force arm; R1 first output force arm; R2, second output force arm. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application will be further described in detail below with reference to the drawings, and the purpose is to help the technical personnel in the field to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present application, and to help its implementation.

[0023] As Figures 1 to 4 shown, the variable lever ratio parking brake mechanism includes handle 2 and ratchet plate 1, the top end of ratchet plate 1 extends into handle 2, push rod assembly is provided in handle 2, intermediate shaft 4 is provided on ratchet plate 1, handle 2 bottom end is fixedly connected to one end of intermediate shaft 4, cable guide plate 3 is fixedly connected to intermediate shaft 4, cable guide plate 3 is connected with cable 7, cable 7 passes through cable guide plate 3, and counterweight 8 is connected to the end of cable 7.

[0024] A shaft hole 11 is formed on ratchet plate 1 for installing intermediate shaft 4, let go of the cavity 22 is arranged at the bottom end of handle 2 for inserting the top of ratchet plate 1 into its inside, cable guide plate 3 is sleeved on the middle part of intermediate shaft 4 and is fixedly connected by welding, the distance from the abutting part of the outer edge of cable guide plate 3 to the axis of intermediate shaft 4 is output force arm, therefore the values of output force arm on different positions of the outer edge of cable guide plate 3 are different, according to the shape of cable guide plate 3, the value of first output force arm is greater than the value close to second output force arm, that is, during the rotating process of cable guide plate 3, output force arm shows a decreasing trend.

[0025] As Figure 1As shown, the push rod assembly includes a push rod 21, the top end of the handle 2 is provided with a button 24, the button 24 and the top end of the push rod 21 are provided with a spring 26, the bottom end of the push rod 21 is movably connected with a pawl 25, the top end of the ratchet plate 1 is provided with a toothed plate 12, the bottom end of the handle 2 is provided with a clearance cavity 22, the pawl 25 and the toothed plate 12 are located in the clearance cavity 22. The handle 2 is provided with a rivet 251 to fix the pawl 25, the top end of the push rod 21 is provided with a spring 26, the handle 2 is a hollow structure, the bottom end of the push rod 21 is bent downward and extends into the clearance cavity 22 and is connected with the pawl 25, a switch assembly 13 is fixedly installed below the ratchet plate 1 through a screw 131, the switch assembly 13 is an existing structure, when the handle 2 is rotated downward to the lowest position, the handle 2 contacts the switch assembly 13 and closes the switch; when the handle 2 is rotated upward, the handle 2 is separated from the switch assembly 13 and opens the switch.

[0026] As shown in Figures 1 to 3 The end of the intermediate shaft 4 is provided with a movable support 5, the ratchet plate 1 and the movable support 5 are oppositely arranged on both sides of the cable guide plate 3, the bottom of the ratchet plate 1 and the movable support 5 is provided with a vehicle floor 10, the vehicle floor 10 is provided with a base 6, the bottom of the ratchet plate 1 is bent to form a first ear plate 15, the bottom of the movable support 5 is bent to form a second ear plate 51, the first ear plate 15 and the second ear plate 51 are both provided with two, the two first ear plates 15 are respectively bolted to the vehicle floor 10 and the base 6, the two second ear plates 51 are respectively bolted to the vehicle floor 10 and the base 6. The ratchet plate 1, the movable support 5 and the base 6 are bolted to the vehicle floor 10, wherein one end of the ratchet plate 1 and one end of the movable support 5 are fixed to the base 6 through a fixing screw 9, since the vehicle floor 10 is fixed to the vehicle body, the three are pre-assembled and fixed when the parking brake handle is assembled, which reduces the installation difficulty and improves the assembly efficiency, and also ensures the overall performance. The ratchet plate 1 and the movable support 5 are both formed with ear plate structures, which form the connection planes with the vehicle floor 10 and the base 6, reducing the number of parts and achieving the development of few parts. The anti-rebound ribs 16 are arranged at the bending positions of the above ear plates to prevent the rebound of the sheet metal, ensure the shape stability, and further ensure the reliable connection effect.

[0027] As shown in Figure 1 The first ear plate 15 is vertically arranged with the ratchet plate 1, and the first ear plate 15 is located on the inner side of the ratchet plate 1. The second ear plate 51 is vertically arranged with the movable support 5, and the second ear plate 51 is located on the inner side of the movable support 5. The vertically arranged ear plates are beneficial to ensure the vertical installation precision of the ratchet plate 1 and the movable support 5, and the ear plates on the ratchet plate 1 and the movable support 5 are located on the inner sides of the two, which improves the compactness of the structure and is beneficial to reduce the size of the parking brake handle cover, thereby reducing the space occupation of the parking brake handle assembly in the cab.

[0028] As shown in Figure 4As shown, a pressure plate 32 is provided at the top of the cable guide plate 3, which presses the cable 7 tightly. The end of the cable 7 extends out of the pressure plate 32, and a fastening bolt 33 is provided at the end of the cable 7. Two fastening holes 321 are provided on the pressure plate 32, and the top of the cable 7 is pressed by bolts. The end of the cable 7 is also provided with a fastening bolt 33 to prevent it from coming out, thus ensuring the reliable function of the cable 7.

[0029] like Figure 4 As shown, the bottom of the cable guide plate 3 is provided with a guide groove 31, and the end of the cable guide plate 3 has an arc transition. When the driver pulls the handle 2, the cable 7 will wrap around the groove on the outer edge of the cable guide plate 3. The guide groove 31 has a guiding function for the cable 7 to ensure that the cable 7 is in the correct direction. The outer edge of the cable guide plate 3 adopts an arc transition design, so that the cable 7 will not generate excessive stress at various parts of the outer edge of the cable guide plate 3, and will not cause damage to the cable 7.

[0030] like Figure 1 As shown, the base 6 has a U-shaped structure, with a cable passage groove 61 in the middle and fixing holes 62 at both ends. The U-shaped design of the base 6 not only improves structural strength but also avoids spatial interference from the longitudinal beam below. The cable passage groove 61 in the middle does not obstruct the cable 7, facilitating its passage. The cable passage groove 61 also provides a positioning effect during the assembly of the cable guide plate 3. The fixing holes 62 are used to install bolts, securing the base 6 to the vehicle floor 10.

[0031] like Figures 1 to 3 As shown, the handle 2 is covered with a protective sleeve 23. The protective sleeve 23 is made of plastic and is convenient for the driver to hold.

[0032] like Figure 4 As shown, the cable guide plate 3 has a raised rib 34 on its side. The raised rib 34 can improve the structural strength of the cable guide plate 3.

[0033] like Figure 4 As shown, the cable guide plate 3 is square, and its rotation radius is a variable value. Compared with the square wire harness guide plate of the parking handle 2 with a conventional variable lever ratio, its output lever arm has a larger range of variation. The input force F1 required by the driver when pulling the handle 2 is lower, the driver can pull the handle 2 more effortlessly, and the operation is more comfortable.

[0034] Working principle: during the process of automobile travel, the handle 2 angle is in the lowest position, at this time the pawl 25 is separated from the cooperation of the tooth plate 12 on the ratchet plate 1, and at the same time the handle 2 contacts the switch assembly 13 to close the switch. When parking is needed, the operator presses the button 24 and lifts the handle 2 upward, the pawl 25 is pushed away from the tooth plate 12 by the lower end of the push rod 2126, and the handle 2 is correspondingly separated from the switch assembly 13 to open the switch. During the rotation of the handle 2, the first output force arm R1 of the cable guide plate 3 gradually transitions to the second output force arm R2, that is, the value of the output force arm R is constantly decreasing during the above transition process, and the reaction force generated by the cable guide plate 3 when pulling the cable 7 is constantly increasing as the output force F2. Since the input force arm L is constant, according to the formula: input force F1 x input force arm L = output force F2 x output force arm R, the input force F1 of the driver operating the handle 2 will be relatively constant or smaller, that is, the labor-saving effect is achieved. When the handle 2 reaches the top, release the button 24, and the pawl 25 is reset by the spring 26 to embed the tooth plate 12 to lock the handle 2.

[0035] The variable lever ratio parking brake mechanism, by using the cable guide plate 3, the rotation radius of the cable guide plate 3 is a variable value, which realizes the change of the output force arm, and the operating force of the parking handle 2 with a fixed lever ratio is lower, which improves the operation comfort, the overall structure design is reasonable, the assembly difficulty is low, the occupied space is small, and the operation of the conventional variable lever ratio parking brake handle is more labor-saving.

[0036] The above is an exemplary description of the present application in conjunction with the drawings. Obviously, the specific implementation of the present application is not limited by the above method. As long as various non-essential improvements are made by using the method concept and technical solution of the present application; or without improvement, the above concept and technical solution of the present application are directly applied to other occasions, which are within the protection scope of the present application.

Claims

1. A variable leverage handbrake mechanism characterised in that: The utility model provides a kind of handle (2) and ratchet plate (1), the ratchet plate (1) top end stretches into handle (2), the handle (2) is equipped with push rod assembly, the ratchet plate (1) is equipped with middle shaft (4), the handle (2) bottom end is fixedly connected in middle shaft (4) one end, middle shaft (4) is fixedly connected with cable guide plate (3), cable guide plate (3) is connected with cable (7), cable (7) passes through cable guide plate (3), the end of cable (7) is connected with counterweight (8), the rotation radius of cable guide plate (3) is a variable value;The top of cable guide plate (3) is equipped with pressing plate (32), and the pressing plate (32) is pressed tightly cable (7), and the end of cable (7) stretches out pressing plate (32), and the end of cable (7) is equipped with fastening bolt (33).

2. A lever ratio varying handbrake mechanism according to claim 1, characterised in that: The push rod assembly includes a push rod (21), a button (24) is provided at the top end of the handle (2), a spring (26) is provided between the button (24) and the top end of the push rod (21), a pawl (25) is movably connected to the bottom end of the push rod (21), a toothed plate (12) is provided at the top end of the ratchet plate (1), and a clearance cavity (22) is provided at the bottom end of the handle (2), wherein the pawl (25) and the toothed plate (12) are both located in the clearance cavity (22).

3. A variable leverage handbrake mechanism according to claim 2, wherein: The end of the middle shaft (4) is provided with a movable support (5), the ratchet plate (1) and the movable support (5) are oppositely arranged on both sides of the cable guide plate (3), the bottom of the ratchet plate (1) and the movable support (5) is provided with a vehicle floor (10), the vehicle floor (10) is provided with a base (6), the bottom of the ratchet plate (1) is bent to form a first ear plate (15), the bottom of the movable support (5) is bent to form a second ear plate (51), the first ear plate (15) and the second ear plate (51) are both provided with two, the first ear plate (15) is bolted to the vehicle floor (10) and the base (6) respectively, and the second ear plate (51) is bolted to the vehicle floor (10) and the base (6) respectively.

4. A lever ratio varying handbrake mechanism according to claim 3, wherein: The first ear plate (15) is vertically arranged with the ratchet plate (1), and the first ear plate (15) is located on the inner side of the ratchet plate (1), the second ear plate (51) is vertically arranged with the movable support (5), and the second ear plate (51) is located on the inner side of the movable support (5).

5. A lever ratio varying handbrake mechanism according to claim 4 wherein: The bottom of the cable guide plate (3) is provided with a guide groove (31), and the end of the cable guide plate (3) is arc-shaped.

6. A variable leverage handbrake mechanism according to any one of claims 3 to 5 wherein: The base (6) is in the shape of a Chinese character, the middle of the base (6) is provided with a wire passing groove (61), and the two ends of the base (6) are provided with fixing holes (62).

7. A lever ratio varying handbrake mechanism according to claim 1 wherein: The handle (2) is externally sleeved with a protective sleeve (23).

8. A lever ratio varying handbrake mechanism according to claim 1 wherein: The side of the cable guide plate (3) is provided with a protruding rib (34).

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