Parking brake control mechanism

Abstract

The utility model discloses a parking brake control mechanism, and belongs to the technical field of engineering machinery. The defects that in the prior art, an air chamber installation space of a traditional parking brake pull rod structure is not enough, installation of the air chamber is affected, and then the brake performance of a whole machine is affected are overcome. A main body structure of the device comprises a double-thread screw, a connecting rod mechanism and an air chamber pull rod, the lower end of the double-thread screw is connected with a gearbox pull rod through a locking mechanism, the upper end of the double-thread screw is connected with one end of the connecting rod mechanism through the locking mechanism, and the other end of the connecting rod mechanism is connected with the upper end of the air chamber pull rod through the locking mechanism. The lower end of the air chamber pull rod is connected with the spring air chamber. The utility model is mainly applied to engineering machinery such as loaders and the like.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and more specifically, it relates to a parking brake control mechanism. Background Technology

[0002] To improve the safety performance of loaders, loaders are generally equipped with a parking brake system, which is generally divided into a hand-cable system and a spring-chamber air brake system. The spring-chamber air brake system is more widely used because it requires less effort. The spring-chamber lever is usually directly connected to the gearbox lever. Under normal circumstances, air is injected into the chamber, compressing the spring and releasing the brake. When the air is released, the spring force is released, lifting the lever and achieving parking braking.

[0003] like Figure 4 The diagram shows an existing tie rod structure. Its working principle is as follows: Below the spring chamber is a chamber tie rod, and below the chamber tie rod is a cross pin, secured by a nut. The cross pin connects to the upper part of the pin connecting plate and is locked by a cotter pin. The lower part of the pin connecting plate connects to the gearbox tie rod via the pin and cotter pin. When the spring chamber is filled with gas, the spring inside is compressed, and the chamber tie rod moves downwards. The gearbox tie rod is not subjected to upward tension, and this is a non-braking state. When the spring chamber is deflated, the chamber tie rod moves upwards under the spring force. The chamber tie rod, through the cross pin, drives the pin connecting plate, which in turn drives the gearbox tie rod upwards, achieving braking. However, the above solution has the following shortcomings:

[0004] 1. Generally, spring air chambers need to be installed vertically above the gearbox tie rod. Especially when installing on small loaders, if there is not enough space, it will affect the installation of the air chamber, leading to installation difficulties, and in turn affecting the layout and use of other operating mechanisms; 2. If the parking brake requires greater pulling force under special circumstances, a larger spring air chamber needs to be replaced. If the existing air chamber does not have enough space, it will affect the installation of the air chamber, and in turn affect the braking performance of the entire machine. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and to provide a parking brake control mechanism.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] A parking brake control mechanism includes a double-ended screw, a linkage mechanism, and an air chamber rod. The lower end of the double-ended screw is connected to a gearbox rod via a locking mechanism, and the upper end of the double-ended screw is connected to one end of the linkage mechanism via a locking mechanism. The other end of the linkage mechanism is connected to the upper end of the air chamber rod via a locking mechanism, and the lower end of the air chamber rod is connected to a spring air chamber.

[0008] Preferably, the linkage mechanism includes a pull rod, a fixed frame, and an air chamber fixing bracket. The middle part of the pull rod is rotatably connected to the fixed frame, and the lower end of the fixed frame is connected to the air chamber fixing bracket by fasteners. The air chamber fixing bracket is mounted on the spring air chamber.

[0009] Preferably, the middle part of the pull rod is rotatably connected to the fixed frame via a bearing.

[0010] Preferably, the fasteners include bolts and nuts.

[0011] Preferably, the locking mechanism includes a cross pin and a pin connecting plate, wherein the cross pin is connected to one end of the pin connecting plate via a pin and is locked by a cotter pin.

[0012] Preferably, both ends of the double-ended screw are threaded to the cross pin and locked by a back nut.

[0013] Preferably, one end of the gearbox tie rod is connected to the other end of the pin connecting plate via a pin, and locked with a cotter pin.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model inverts the air chamber and amplifies the force through a linkage mechanism to connect it to the gearbox tie rod of the gearbox. This converts the downward pulling force of the air chamber into an upward pulling force to achieve parking brake. The parking brake force can be adjusted by adjusting the lever arm of the linkage mechanism. This solves the problem that small loaders cannot use spring air chambers to achieve parking brake due to insufficient installation space.

[0016] 2. The ratio of the tie rod can be adjusted according to the actual situation. For example, a 1:1 ratio of the left side to the right side ensures that the displacement of the tie rod remains unchanged. A 1:1.5 ratio of the left side to the right side can increase the force and lift the parking vehicle. By adjusting the different lever arms of the linkage mechanism, the force of the spring air chamber can be effectively controlled, and the force-increasing effect can be achieved.

[0017] 3. The connection between the double-ended screw and the gearbox tie rod, linkage mechanism, and air chamber tie rod ensures the compact structure of the entire parking brake control mechanism. The application of the locking mechanism ensures the stable connection between various components, improving the overall stability and reliability of the system.

[0018] 4. Using bolts and nuts as fasteners simplifies the connection process between the fixed frame and the air chamber fixed bracket, making installation and maintenance more convenient. At the same time, using standard parts such as cross pins, pin connecting plates, and cotter pins for connection and locking further simplifies the assembly process, effectively solves the problem of installation errors, and improves operability during maintenance.

[0019] 5. Because the middle part of the pull rod is rotatably connected to the fixed frame through a bearing, the friction between moving parts is reduced, thereby improving the sensitivity of the parking brake control mechanism, speeding up the response, and improving braking efficiency.

[0020] 6. The back nut is used to lock the threaded connection between the double-ended screw and the cross pin, preventing loosening due to vibration or other factors, and increasing the safety of the parking brake. In addition, the connection between the gearbox tie rod and the pin connecting plate also adopts the same locking measure, further ensuring the safety performance when the vehicle is parked. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention;

[0022] Figure 2 This is the left view of the present invention;

[0023] Figure 3 This is a top view of the present invention;

[0024] Figure 4 This is a schematic diagram of the existing parking brake lever structure.

[0025] In the diagram: 1. Gearbox tie rod; 2. Cross pin; 3. Pin connecting plate; 4. Pin; 5. Back nut; 6. Cotter pin; 7. Bolt; 8. Nut; 9. Spring chamber; 10. Chamber fixing bracket; 11. Double-ended screw; 12. Tie rod; 13. Fixing bracket; 14. Bearing; 15. Chamber tie rod; 16. Locking mechanism. Detailed Implementation

[0026] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

[0027] Example 1:

[0028] like Figures 1-3 As shown, a parking brake control mechanism includes a double-ended screw 11, a linkage mechanism, and an air chamber rod 15. The lower end of the double-ended screw 11 is connected to the gearbox rod 1 via a locking mechanism 16, and the upper end of the double-ended screw 11 is connected to one end of the linkage mechanism via the locking mechanism 16. The other end of the linkage mechanism is connected to the upper end of the air chamber rod 15 via the locking mechanism 16. The lower end of the air chamber rod 15 is connected to the spring air chamber 9.

[0029] In this embodiment, by inverting the air chamber, a linkage mechanism is used to convert the downward pulling force of the air chamber into an upward pulling force to achieve parking brake. The parking brake force can be adjusted by adjusting the lever arm of the linkage mechanism, that is, the pulling force can be adjusted by adjusting the size of the lever 12.

[0030] Example 2:

[0031] A parking brake control mechanism differs from Embodiment 1 in that the linkage mechanism includes a pull rod 12, a fixed frame 13, and an air chamber fixing bracket 10. The middle part of the pull rod 12 is rotatably connected to the fixed frame 13 via a bearing 14, and the lower end of the fixed frame 13 is connected to the air chamber fixing bracket 10 via fasteners. The air chamber fixing bracket 10 is mounted on the spring air chamber 9. The fasteners include mating bolts 7 and nuts 8; the bearing 14 ensures smooth rotation, and the bearing 14 can also be replaced with a sleeve.

[0032] Furthermore, the locking mechanism 16 includes a cross pin 2 and a pin connecting plate 3. The cross pin 2 is connected to one end of the pin connecting plate 3 via a pin 4 and is locked by a cotter pin 6. The cotter pin 6 is used for positioning and locking to prevent the cross pin 2 from loosening and falling off the pin connecting plate 3.

[0033] Specifically, both the upper and lower ends of the double-ended screw 11 are connected to the cross pin 2 by thread assembly (i.e., the upper and lower ends of the double-ended screw 11 are external threads, and the cross pin 2 is an internal thread), ensuring that the mechanism can adjust the empty stroke and is locked by the back nut 5; the connection method between the upper end of the air chamber pull rod 15 and the cross pin 2 is the same as the connection method between the double-ended screw 11 and the cross pin 2.

[0034] One end of the gearbox tie rod 1 is connected to the other end of the pin connecting plate 3 via the pin 4 and locked by the cotter pin 6; the connection method between the two ends of the tie rod 12 and the pin connecting plate 3 is the same as the connection method between the gearbox tie rod 1 and the pin connecting plate 3.

[0035] Furthermore, if the stroke of the spring chamber 9 is large enough, the double-ended stud assembly structure of the cross pin 2 and the double-ended screw 11 can be changed into an integrated structure, which can adjust the free stroke of the chamber pull rod 15.

[0036] The working principle of this utility model is as follows:

[0037] When no gas is introduced into the spring chamber 9, the spring force retracts the chamber pull rod 15. The chamber pull rod 15 is connected to the cross pin 2 above the chamber pull rod 15, which drives the right end of the pull rod 12 to move downward and the left end of the pull rod 12 to move upward, driving the double-ended screw 11 to move upward. The double-ended screw 11 pulls the pin connecting plate 3 through the cross pin 2 below the double-ended screw 11, and pulls the gearbox pull rod 1 upward. The gearbox pull rod 1 pushes the friction plate to realize the parking brake.

[0038] When gas is introduced into the spring chamber 9, the spring force is compressed. When the spring force is released, the chamber pull rod 15 extends outward. The chamber pull rod 15 is connected to the cross pin 2 above the chamber pull rod 15, which drives the right end of the pull rod 12 to move upward and the left end of the pull rod 12 to move downward, which drives the double-ended screw 11 to move downward. The double-ended screw 11 pulls the pin connecting plate 3 through the cross pin 2 below the double-ended screw 11 and pushes the gearbox pull rod 1 downward, thus releasing the brake on the friction plate.

Claims

1. A parking brake control mechanism, characterized in that: It includes a double-ended screw (11), a linkage mechanism and an air chamber pull rod (15). The lower end of the double-ended screw (11) is connected to the gearbox pull rod (1) through a locking mechanism (16). The upper end of the double-ended screw (11) is connected to one end of the linkage mechanism through the locking mechanism (16). The other end of the linkage mechanism is connected to the upper end of the air chamber pull rod (15) through the locking mechanism (16). The lower end of the air chamber pull rod (15) is connected to the spring air chamber (9).

2. The parking brake control mechanism according to claim 1, characterized in that: The linkage mechanism includes a pull rod (12), a fixed frame (13), and an air chamber fixing bracket (10). The middle part of the pull rod (12) is rotatably connected to the fixed frame (13), and the lower end of the fixed frame (13) is connected to the air chamber fixing bracket (10) by fasteners. The air chamber fixing bracket (10) is installed on the spring air chamber (9).

3. The parking brake operating mechanism according to claim 2, characterized in that: The middle part of the pull rod (12) is rotatably connected to the fixed frame (13) via a bearing (14).

4. The parking brake operating mechanism according to claim 2, characterized in that: The fasteners include bolts (7) and nuts (8).

5. The parking brake operating mechanism according to claim 2, characterized in that: The locking mechanism (16) includes a cross pin (2) and a pin connecting plate (3). The cross pin (2) is connected to one end of the pin connecting plate (3) through a pin (4) and locked by a cotter pin (6).

6. The parking brake operating mechanism according to claim 5, characterized in that: Both ends of the double-headed screw (11) are threaded to the cross pin (2) and locked by the back nut (5).

7. The parking brake operating mechanism according to claim 6, characterized in that: One end of the gearbox tie rod (1) is connected to the other end of the pin connecting plate (3) via a pin (4) and locked by a cotter pin (6).

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