Rear suspension bracket structure of tractor

Abstract

The utility model discloses a tractor rear suspension bracket structure which comprises an upper pull rod and a lower pull rod, a lower hinged support is arranged at the lower end of a lifting rod, and vertical kidney-shaped holes are formed in the two sides of the lower hinged support; a plurality of hinged mounting holes are formed in the middle of the lower pull rod in the length direction of the lower pull rod, the middle of the lower pull rod is arranged in the lower hinged support, and the hinged mounting holes correspond to the vertical kidney-shaped holes; a high-hardness wear-resistant shaft sleeve is installed in the hinged installation hole in an interference fit mode, and the lower pull rod and the lifting rod are rotatably connected in the mode that a pin shaft penetrates through the vertical kidney-shaped hole and the high-hardness wear-resistant shaft sleeve. According to the utility model, the problem of abrasion of the pin hole of the three-point suspension lower pull rod of the tractor is solved, and the overall maintenance efficiency and the maintenance convenience are improved.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery technology, specifically relating to a tractor rear suspension structure. Background Technology

[0002] The three-point suspension system of a tractor serves as a transitional device between the tractor and agricultural implements. It mainly consists of a lift rod, a lower tie rod, a central tie rod, and a limit rod. During operation, the tractor and implements are subjected to continuous impact loads, making the joints and other connecting parts prone to wear. Existing tractor three-point suspensions connect the lift rod and lower tie rod via a single pin, which has the following drawbacks:

[0003] 1. The pins and pin holes at the connection between the pull rod and the lifting rod are severely worn, resulting in a short service life and greatly affecting the agricultural performance of the tractor unit;

[0004] 2. Poor maintenance convenience.

[0005] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of this utility model, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this utility model is to provide a tractor rear suspension frame structure that solves the problem of wear on the pin holes of the three-point suspension lower tie rod of the tractor, and greatly reduces the damage to the three-point suspension lower tie rod caused by the impact load generated when the tractor is carrying agricultural implements.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A tractor rear suspension structure includes a pull rod and a lift rod, wherein: a lower hinge seat is provided at the lower end of the lift rod, and vertical oblong holes are provided on both sides of the lower hinge seat; a plurality of hinge mounting holes are provided along the length of the middle of the pull rod, and the middle part of the pull rod is located in the lower hinge seat, such that the hinge mounting holes correspond to the vertical oblong holes; a high-hardness wear-resistant bushing is installed in the hinge mounting hole by interference fit, and the pull rod and the lift rod are rotatably connected by a pin passing through the vertical oblong holes and the high-hardness wear-resistant bushing.

[0009] Specifically, the high-hardness wear-resistant bushing and the pin are connected by a clearance fit.

[0010] Specifically, the high-hardness wear-resistant bushing is connected to the hinged mounting hole by an interference fit.

[0011] Specifically, the pin is limited by a flexible pin.

[0012] Specifically, the front end of the pull rod is provided with a lug for attaching agricultural implements, and the rear end of the pull rod is provided with a second hinge plate for vertically hinged to the rear axle chassis of the tractor.

[0013] Specifically, the upper end of the lifting rod is provided with an upper hinge seat for vertically hinged to the lifting arm of the tractor.

[0014] Specifically, it also includes an upper tie rod, the front end of which is provided with a first hinge ear plate for vertically hinged to agricultural implements, and the rear end of which is provided with a first transverse hinge bracket for connecting to the rear axle housing of a tractor.

[0015] Specifically, it also includes a limiting rod, the rear end of which is provided with a vertical hinge bracket for connecting with the tractor rear axle chassis; a fixed mounting hole is also provided on the pull rod between the hinge mounting hole and the lug, and the front end of the limiting rod is fixedly connected to the fixed mounting hole through a second transverse hinge bracket.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In terms of structure: This utility model adds a high-hardness wear-resistant bushing at the connection position of the moving rod of the three-point suspension of the tractor, so that the rod is not easily worn and the structure is more reasonable.

[0018] In terms of cost: During high-intensity, uninterrupted work, the requirements for the three-point suspension rods are higher. Adding high-hardness, wear-resistant bushings can prevent the pin holes from wearing out, extend the service life of the pull rods, and only require replacing the easily worn pins, effectively reducing costs and greatly improving the performance and service life of the three-point suspension.

[0019] In terms of functionality: This utility model improves the adaptability of application by adding a high-hardness wear-resistant bushing to the pin hole of the three-point suspension pull rod. In terms of maintenance and upkeep, it can be done by replacing the easily worn pin, which improves the efficiency and convenience of overall maintenance and repair. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a tractor rear suspension frame structure according to the present invention.

[0021] Figure 2 This is an exploded view of a tractor rear suspension frame structure according to the present invention.

[0022] In the diagram, 1-upper pull rod; 2-upper pull rod; 3-lifting rod; 4-limiting rod; 5-first hinge ear plate; 6-first transverse hinge bracket; 7-hanging ear; 8-second hinge ear plate; 9-hinge mounting hole; 10-fixed mounting hole; 11-upper hinge seat; 12-lower hinge seat; 13-vertical oblong hole; 14-high hardness wear-resistant bushing; 15-pin; 16-elastic pin; 17-vertical hinge bracket; 18-second transverse hinge bracket. Detailed Implementation

[0023] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with embodiments and accompanying drawings. In the description of these embodiments, it should be understood that terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this embodiment and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] The technical solution adopted in this embodiment is a tractor rear suspension frame structure, such as... Figure 1 As shown, it mainly includes an upper pull rod 1, with lower pull rods 2 symmetrically arranged on both sides below the upper pull rod, a lifting rod 3 in the middle of the lower pull rod, and a limit rod 4 on the outside of the lower pull rod.

[0025] refer to Figure 2 The upper pull rod 1 shown has a first hinge ear plate 5 at its front end for vertically hinged to agricultural implements, and a first transverse hinge bracket 6 at its rear end for connecting to the rear axle housing of a tractor.

[0026] like Figure 2 The pull rod 2 shown has a lug 7 at its front end for attaching agricultural implements, and a second hinge plate 8 at its rear end for vertically hinged to the rear axle chassis of the tractor. Multiple hinge mounting holes 9 are provided along the length of the pull rod 2 in the middle, and a fixing mounting hole 10 is also provided on the pull rod 2 between the hinge mounting hole 9 and the lug 7.

[0027] The upper end of the lifting rod 3 is provided with an upper hinge seat 11 for vertically hinged to the lifting arm of the tractor, and the lower end of the lifting rod 3 is provided with a lower hinge seat 12.

[0028] The lower pull rod 2 is located in the middle of the lower hinge seat 12, and the lower hinge seat 12 is also provided with vertical oblong holes 13 on both sides, such as... Figure 2 As shown, a high-hardness wear-resistant bushing 14 is installed in the hinge mounting hole 9 by interference fit. The pull rod 2 and the lifting rod 3 are rotatably connected by a pin 15 passing through the vertical waist-shaped hole 13 and the high-hardness wear-resistant bushing 14. The end of the pin 15 is limited by an elastic pin 16.

[0029] The rear end of the limiting rod 4 is provided with a vertical hinge bracket 17 for connecting with the rear axle chassis of the tractor, and the front end of the limiting rod 4 is fixedly connected to the fixed mounting hole 10 through the second transverse hinge bracket 18.

[0030] In this embodiment, during suspension operation, the upper tie rod 1 and the lower tie rod 2 work together to connect the tractor's rear suspension system to the implement. This creates a stable connection between the tractor and the implement via the upper and lower tie rods. The tractor driver operates the lifting arm, adjusting the suspension height via the upper hinge seat 11 and the lifting rod 3. The vertical oblong hole 13 of the lifting rod 3 allows for vertical adjustment, and the hinge mounting hole 9 allows for forward and backward adjustment, altering the height, distance, or angle between the lower tie rod 2 and the implement, adapting to different working environments such as ground height and operating angle. The limiting rod 4 ensures the suspension system remains stable during operation, preventing excessive swaying or instability. After operation, the driver can adjust the lifting arm via the tractor's operating system to raise or lower the suspension and implement for convenient subsequent operations or relocation.

[0031] In existing technologies, the wear of the pin hole in the three-point suspension lower lever is frequent, resulting in poor reliability and difficult maintenance. This embodiment addresses these issues by adding a high-hardness wear-resistant bushing 14 at the connection point between the lower lever 2 and the lifting rod 3 of the tractor's three-point suspension. The high-hardness wear-resistant bushing 14 is interference-fitted with the lower lever 2 and cold-pressed. The high-hardness wear-resistant bushing 14 and the pin 15 have a small clearance fit. Compared with existing technologies, the addition of the high-hardness wear-resistant bushing 14 at the pin hole position at the connection point between the tractor's three-point suspension lower lever and the lifting rod significantly reduces the damage to the three-point suspension lower lever caused by the impact load generated when the tractor is carrying agricultural implements. For subsequent maintenance, the wear part of the pin 15 can be replaced, improving the overall maintenance efficiency and ease of repair.

[0032] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A tractor rear suspension frame structure, comprising a pull rod (2) and a lifting rod (3), characterized in that: The lower end of the lifting rod (3) is provided with a lower hinge seat (12), and vertical waist-shaped holes (13) are provided on both sides of the lower hinge seat (12); a plurality of hinge mounting holes (9) are provided in the middle of the pull rod (2) along its length direction, and the middle of the pull rod (2) is located in the lower hinge seat (12), so that the hinge mounting holes (9) correspond to the vertical waist-shaped holes (13); a high hardness wear-resistant bushing (14) is installed in the hinge mounting hole (9) by interference fit, and the pull rod (2) and the lifting rod (3) are rotatably connected by a pin (15) passing through the vertical waist-shaped hole (13) and the high hardness wear-resistant bushing (14).

2. The tractor rear suspension frame structure according to claim 1, characterized in that: The high-hardness wear-resistant bushing (14) and the pin (15) are connected by a clearance fit.

3. The tractor rear suspension frame structure according to claim 1, characterized in that: The high-hardness wear-resistant bushing (14) is connected to the hinged mounting hole (9) by an interference fit.

4. The tractor rear suspension frame structure according to claim 1, characterized in that: The pin (15) is limited by the elastic pin (16).

5. The tractor rear suspension frame structure according to claim 1, characterized in that: The front end of the pull rod (2) is provided with a hanging ear (7) for attaching agricultural implements, and the rear end of the pull rod (2) is provided with a second hinge plate (8) for vertically hinged to the rear axle chassis of the tractor.

6. The tractor rear suspension frame structure according to claim 1, characterized in that: The upper end of the lifting rod (3) is provided with an upper hinge seat (11) for vertically hinged to the lifting arm of the tractor.

7. The tractor rear suspension frame structure according to claim 1, characterized in that: It also includes an upper pull rod (1), the front end of which is provided with a first hinge ear plate (5) for vertically hinged to agricultural implements, and the rear end of the upper pull rod (1) is provided with a first transverse hinge bracket (6) for connecting to the rear axle housing of the tractor.

8. The tractor rear suspension frame structure according to claim 1, characterized in that: It also includes a limiting rod (4), the rear end of which is provided with a vertical hinge bracket (17) for connecting with the rear axle chassis of the tractor; A fixed mounting hole (10) is also provided on the pull rod (2) between the hinge mounting hole (9) and the lug (7), and the front end of the limiting rod (4) is fixedly connected to the fixed mounting hole (10) through the second transverse hinge bracket (18).

Images