Downward-pressing type double-limiting traction mechanism for tractor

Abstract

The utility model discloses a down-pressing type double-limit traction mechanism for a tractor, which comprises a rear counterweight and an operating lever, a traction seat is mounted on the surface of the rear counterweight, a traction pin is arranged above the traction seat, and the traction pin is connected with the operating lever through a transmission mechanism. And the traction mechanism is configured to control lifting and pressing of the traction pin through a transmission mechanism by an operating rod, a limiting mechanism is further installed on the surface of the rear balance weight and comprises a frame body installed on the rear balance weight, a support is installed on the surface of the frame body, and the support is connected with a limiting plate through a rotating shaft. The structure is simple, the limiting mechanism is arranged below the operating rod, the exposed area of the strip-shaped groove can be adjusted by controlling the state (namely closing or opening) of the limiting plate, then the moving range of the operating rod is effectively limited, and the design solves the problem that when a tractor encounters strong vibration, the middle connecting rod jumps up due to vibration, and the operating rod is damaged. And the unexpected pressing movement of the operating lever is triggered by adjusting the connecting rod.

Description

Technical Field

[0001] This utility model relates to the field of tractor technology, specifically a downward-pressing double-limiting traction mechanism for tractors. Background Technology

[0002] In the design of internal combustion engine tractor units, the traditional towing mechanism is typically mounted on the vehicle's rear counterweight. The towing pin is operated by pressing down a lever, which, through a series of links (including the adjusting link, middle link, and rear link). This design ensures that when traveling on a flat road, even with slight vibrations as the towing pin connects to the cargo and moves, the middle link's movement is relatively small. In this scenario, when the middle link jumps up, it causes the towing pin to jump up as well, and the lower end of the rear link's slot presses against the connecting bolt fixed to the middle link. The impact force generated during this process is absorbed by a rubber pad mounted on the middle link and in contact with the rear counterweight, and then acts on the rear counterweight to provide the necessary limiting effect, preventing the towed cargo from accidentally slipping off.

[0003] However, in practical applications, especially when the road conditions at the user's site are poor, the aforementioned traditional traction mechanism has significant shortcomings. Specifically, uneven road surfaces cause the central connecting rod to jump higher, resulting in the towing pin jumping higher than expected. Due to the increased jump height, the impact force originally intended to be transmitted to the rear counterweight cannot be effectively transmitted, causing the towing pin to lose its proper limit control. This not only increases the instability of goods during transportation but may also create safety hazards and affect operational efficiency. Therefore, a downward-pressing double-limit traction mechanism for tractor vehicles is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a downward-pressing double-limiting traction mechanism for tractor vehicles to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a downward-pressing double-limiting traction mechanism for a tractor, comprising a rear counterweight and a control lever. A traction seat is mounted on the surface of the rear counterweight, and a traction pin is provided above the traction seat. The traction pin is connected to the control lever via a transmission mechanism and is configured such that the control lever controls the lifting and pressing of the traction pin via the transmission mechanism. A limiting mechanism is also mounted on the surface of the rear counterweight. The limiting mechanism includes a frame mounted on the rear counterweight, and a bracket is mounted on the surface of the frame. The bracket is connected to a limiting plate via a rotating shaft and is configured such that when the limiting plate is on top, it can limit the downward pressing of the control lever.

[0006] As a further embodiment of this utility model: the frame consists of two symmetrically designed support plates and a cover plate disposed along the top edge of the two support plates. The cover plate includes a right-angle section, an inclined section, and a planar section, wherein the inclined section forms an angle with the horizontal direction. ≦ 40 degrees.

[0007] As a further embodiment of this utility model: a strip groove is provided in the middle of the inclined section for the control lever to pass through.

[0008] As a further embodiment of this utility model: a through hole is provided on the rear counterweight, and a front bracket and a rear bracket are respectively installed at the two openings of the through hole, and one end of the control lever is fixed to the front bracket by a connecting bolt.

[0009] As a further embodiment of this utility model: the transmission mechanism includes an adjusting connecting rod disposed in the through hole and a middle connecting rod disposed outside the through hole. One end of the adjusting connecting rod is connected to the operating lever by a connecting bolt, and the other end of the adjusting connecting rod is connected to the middle connecting rod by a connecting bolt. The end of the middle connecting rod is fixed to the rear bracket by a connecting bolt, and the end of the middle connecting rod away from the rear bracket is connected to the rear connecting rod by a connecting bolt. The end of the rear connecting rod away from the middle connecting rod is connected to the traction pin by a connecting bolt.

[0010] As a further embodiment of this utility model, a rubber pad is installed on the outer surface of the connecting rod.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This application sets a limiting mechanism below the control lever. By controlling the state of the limiting plate (i.e., closed or open), the exposed area of ​​the strip groove can be adjusted, thereby effectively limiting the range of motion of the control lever. This design solves the problem that when the tractor encounters strong vibration, the middle connecting rod jumps up due to vibration, and the control lever is unexpectedly pressed down by adjusting the connecting rod. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the prior art traction mechanism of this utility model;

[0014] Figure 2 This is a schematic diagram of the overall structure of the traction mechanism of this utility model;

[0015] Figure 3 This is a partial cross-sectional schematic diagram of the traction mechanism of this utility model;

[0016] Figure 4 This is a schematic diagram of the initial state of the joystick of this utility model;

[0017] Figure 5 This is a schematic diagram of the joystick in the depressed state of this utility model;

[0018] Figure 6 This is a schematic diagram of the limiting mechanism of this utility model;

[0019] Figure 7 This is a schematic diagram of the cover plate of this utility model;

[0020] In the diagram: 1. Rear counterweight; 2. Control lever; 3. Limiting mechanism; 3-1. Frame; 3-1-1. Support plate; 3-1-2. Cover plate; 3-2. Bracket; 3-3. Limiting plate; 4. Front bracket; 5. Adjusting link; 6. Rear bracket; 7. Middle link; 8. Rubber pad; 9. Connecting bolt; 10. Rear link; 11. Traction pin; 12. Traction seat. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-7 In this embodiment of the present invention, a downward-pressing double-limiting traction mechanism for a tractor includes a rear counterweight 1 and a control lever 2. A traction seat 12 is mounted on the surface of the rear counterweight 1, and a traction pin 11 is provided above the traction seat 12. When the traction pin 11 is lifted, its end disengages from the traction seat 12. At this time, the goods to be tracted can be hung on the traction seat 12, and the traction pin 11 is pressed down, so that the end of the traction pin 11 re-engages with the traction seat 12, completing the connection between the goods and the tractor. The traction pin 11 is connected to the control lever 2 through a transmission mechanism and is configured such that the control lever 2 controls the lifting and pressing of the traction pin 11 through the transmission mechanism. When the control lever 2 presses down, the traction pin 11 achieves... The lever 2 is lifted, and at the same time the traction pin 11 is pressed down; a limiting mechanism 3 is also installed on the surface of the rear counterweight 1. The limiting mechanism 3 includes a frame 3-1 installed on the rear counterweight 1. A bracket 3-2 is installed on the surface of the frame 3-1. The bracket 3-2 is connected to the limiting plate 3-3 through a rotating shaft and is configured to limit the downward pressure of the lever 2 when the limiting plate 3-3 is on. The frame 3-1 consists of two symmetrically designed support plates 3-1-1 and a cover plate 3-1-2 set along the top edge of the two support plates 3-1-1. The cover plate 3-1-2 includes a right-angle section, an inclined section and a flat section. The angle between the inclined section and the horizontal direction is ≦40 degrees. A strip groove for the lever 2 to pass through is opened in the middle of the inclined section.

[0023] Specifically, when the limiting plate 3-3 is opened, the entire strip groove on the inclined section is exposed, providing a movable path for the control lever 2. The control lever 2 can move freely within this path. However, when the limiting plate 3-3 is closed, it partially obscures the strip groove, leaving only the area for the control lever 2 to pass through. In this case, the control lever 2 no longer has room to move, and the tilt angle of the inclined section... ≦ The angle is 40 degrees, so that when the lever 2 is pressed down, it is not easy to flip open the limiting plate 3-3 on the cover, thus achieving a better limiting effect.

[0024] Please see Figure 2-3 In one embodiment, preferably, a through hole is provided on the rear counterweight 1, and a front bracket 4 and a rear bracket 6 are respectively installed at the two openings of the through hole. One end of the control lever 2 is fixed to the front bracket 4 by a connecting bolt 9. At this time, the control lever 2 can rotate with the connecting bolt 9 on the front bracket 4 as the axis.

[0025] Please see Figure 2-3 In one embodiment, preferably, the transmission mechanism includes an adjusting rod 5 disposed within the through hole and a middle connecting rod 7 disposed outside the through hole. One end of the adjusting rod 5 is connected to the operating lever 2 via a connecting bolt 9, and the adjusting rod 5 and the operating lever 2 are rotatable. The other end of the adjusting rod 5 is connected to the middle connecting rod 7 via a connecting bolt 9, and the adjusting rod 5 and the middle connecting rod 7 are rotatable. The end of the middle connecting rod 7 is fixed to the rear bracket 6 via a connecting bolt 9. At this time, the middle connecting rod 7 can rotate around the connecting bolt 9 on the rear bracket 6 as its axis. The end of the middle connecting rod 7 away from the rear bracket 6... The middle link 7 is connected to the rear link 10 via connecting bolt 9. The middle link 7 and the rear link 10 are rotatable. The end of the rear link 10 away from the middle link 7 is connected to the traction pin 11 via connecting bolt 9. The rear link 10 and the traction pin 11 are rotatable. A rubber pad 8 is installed on the outer surface of the middle link 7. Furthermore, in the free state, the rubber pad 8 on the middle link 7 contacts the rear counterweight 1. When the driver slowly releases the control lever 2, the traction pin 11 falls back onto the traction seat 12, and the rubber pad 8 contacts the counterweight, which plays a buffering role and can prevent the middle link 7 from directly impacting the rear counterweight 1.

[0026] The working principle and usage process of this utility model are as follows: When it is necessary to tow goods, first, the limiting plate 3-3 is flipped open to expose the strip groove. Then, the operating lever 2 is pressed down, and the operating lever 2 sequentially drives the adjusting link 5, the middle link 7, the rear link 10, and the traction pin 11 to move. At this time, the position of the traction pin 11 is raised, and the goods to be towed are fixed in the traction seat 12. Then, the operating lever 2 is lifted, and the operating lever 2 sequentially drives the adjusting link 5, the middle link 7, the rear link 10, and the traction pin 11 to move. At this time, the position of the traction pin 11 is pressed down, and its end re-contacts the traction seat 12, thereby achieving the purpose of fixing the goods to be towed. Next, the limiting plate 3-3 is placed over the position of the control lever 2. When the vibration of the tractor vehicle is not significant, the jumping traction pin 11 can transmit the impact force to the rear counterweight 1 through the rear connecting rod 10, connecting bolt 9, middle connecting rod 7 and traction pin 11, limiting the traction pin 11 to jump higher and achieving the limiting effect (the principle and process of transmitting the impact force to the rear counterweight are existing technologies and will not be elaborated here). When the vibration of the tractor vehicle is significant, the middle connecting rod 7, which jumps higher, drives the adjusting connecting rod 5 and the control lever 2. The control lever 2 makes a downward pressing movement and hits the limiting plate on the limiting mechanism 3 that has not been flipped up, achieving a double limiting effect.

[0027] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0028] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A downward-pressing double-limiting traction mechanism for a tractor, comprising a rear counterweight (1) and a control lever (2), wherein a traction seat (12) is mounted on the surface of the rear counterweight (1), and a traction pin (11) is provided above the traction seat (12), characterized in that, The traction pin (11) is connected to the control lever (2) through a transmission mechanism and is configured to control the lifting and pressing of the traction pin (11) by the control lever (2) through the transmission mechanism. A limiting mechanism (3) is also installed on the surface of the rear counterweight (1). The limiting mechanism (3) includes a frame (3-1) installed on the rear counterweight (1). A bracket (3-2) is installed on the surface of the frame (3-1). The bracket (3-2) is connected to the limiting plate (3-3) through a rotating shaft and is configured to limit the pressing of the control lever (2) when the limiting plate (3-3) is on.

2. The downward-pressing double-limiting traction mechanism for a tractor vehicle according to claim 1, characterized in that, The frame (3-1) consists of two symmetrically designed support plates (3-1-1) and a cover plate (3-1-2) set along the top edge of the two support plates (3-1-1). The cover plate (3-1-2) includes a right-angle section, an inclined section and a planar section, wherein the angle between the inclined section and the horizontal direction is ≦40 degrees.

3. The downward-pressing double-limiting traction mechanism for a tractor vehicle according to claim 2, characterized in that, The inclined section has a slot in the middle for the control lever (2) to pass through.

4. The downward-pressing double-limiting traction mechanism for a tractor vehicle according to claim 1, characterized in that, The rear counterweight (1) has a through hole, and a front bracket (4) and a rear bracket (6) are installed at the two openings of the through hole respectively. One end of the control lever (2) is fixed to the front bracket (4) by a connecting bolt (9).

5. The downward-pressing double-limiting traction mechanism for a tractor vehicle according to claim 4, characterized in that, The transmission mechanism includes an adjusting rod (5) located inside the through hole and a middle connecting rod (7) located outside the through hole. One end of the adjusting rod (5) is connected to the operating lever (2) by a connecting bolt (9), and the other end of the adjusting rod (5) is connected to the middle connecting rod (7) by a connecting bolt (9). The end of the middle connecting rod (7) is fixed to the rear support (6) by a connecting bolt (9). The end of the middle connecting rod (7) away from the rear support (6) is connected to the rear connecting rod (10) by a connecting bolt (9). The end of the rear connecting rod (10) away from the middle connecting rod (7) is connected to the traction pin (11) by a connecting bolt (9).

6. The downward-pressing double-limiting traction mechanism for a tractor vehicle according to claim 5, characterized in that, A rubber pad (8) is installed on the outer surface of the middle connecting rod (7).

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