Three-point suspension device applied to tractor and driven by electric cylinder

Abstract

The invention discloses a three-point suspension device applied to a tractor and driven by an electric cylinder, which comprises a lifting arm, an upper pull rod, a lower pull rod, a lifting pull rod and a driving mechanism for driving the lifting arm to move, one end of the lifting arm is hinged with the upper end of the lifting pull rod; the lower end of the lifting pull rod is hinged to the middle position of the lower pull rod; one end of the lower pull rod is hinged to a rack of the tractor, and the other end of the lower pull rod is hinged to the lower end of a stand column of an agricultural implement. One end of the upper pull rod is hinged to a rack of the tractor, the other end of the upper pull rod is hinged to the upper end of a stand column of the agricultural implement, and through the improvement, the three-point suspension device can achieve rapid hanging connection between the electric commercial chassis and the agricultural implement.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mountainous area transportation, and particularly relates to a three-point suspension device with electric cylinder transmission applied to a tractor. BACKGROUND

[0002] The tractor suspension device can be generally divided into two-point suspension and three-point suspension, and the tractor rear suspension usually adopts a three-point suspension combined with hydraulic drive, and is widely applied due to its simple structure. The three-point suspension device is a set of linkages for connecting agricultural implements to a tractor, mainly composed of lifting arms, upper pull rods, lower pull rods and the like. The three-point suspension device has a great effect on agricultural tractors, and can quickly connect different types of agricultural implements to the tractor.

[0003] With the development of science and technology, the electric drive technology is gradually applied in the field of agricultural operation due to its low emission, high torque and convenience for unmanned operation. However, when the electric commercial chassis is used to tow agricultural implements, there is no rear axle structure similar to the tractor, so the suspension device cannot be pre-installed, which brings certain difficulties to the operation of towing agricultural implements. SUMMARY

[0004] In order to overcome the deficiencies in the prior art, the present application provides a three-point suspension device with electric cylinder transmission applied to a tractor, which can realize quick hitching between the electric commercial chassis and the agricultural implement.

[0005] The technical scheme for solving the above technical problem of the present application is:

[0006] A three-point suspension device with electric cylinder transmission applied to a tractor, comprising a lifting arm, an upper pull rod, a lower pull rod, a lifting pull rod and a driving mechanism for driving the lifting arm to move, wherein the lifting arm is installed on the frame of the tractor, one end of the lifting arm is hinged to the upper end of the lifting pull rod; the lower end of the lifting pull rod is hinged to the middle position of the lower pull rod; one end of the lower pull rod is hinged to the frame of the tractor, and the other end is hinged to the lower end of the stand column of the agricultural implement; one end of the upper pull rod is hinged to the frame of the tractor, and the other end is hinged to the upper end of the stand column of the agricultural implement.

[0007] Preferably, the driving mechanism is a linear driving mechanism.

[0008] Preferably, the linear driving mechanism is an electric push rod.

[0009] Preferably, the linear driving mechanism is an electric cylinder.

[0010] Preferably, the middle position of the lifting arm is rotationally connected to the frame.

[0011] Preferably, the fixed seat of the linear drive mechanism is hinged to the frame, and the drive end of the linear drive mechanism is hinged to one end of the lifting arm.

[0012] Preferably, one end of the lifting arm is fixed to the frame, and the other end is connected to the lifting rod.

[0013] Preferably, the lifting rod is an electric cylinder or an electric push rod.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0015] 1. The three-point suspension device of the present invention, which is applied to tractors and uses electric cylinder transmission, has a simple structure and can quickly connect different types of agricultural implements to the tractor. Furthermore, this application can be designed to be electric, matching the functions and performance of traditional hydraulic rear three-point suspension devices.

[0016] 2. The three-point suspension device of the present invention, which uses electric cylinder transmission and is applied to tractors, can realize the quick connection between electric commercial chassis and agricultural implements. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of the suspension projection of the three-point suspension device with electric cylinder drive applied to a tractor according to the present invention during position adjustment.

[0018] Fig. 2 This is a simplified diagram of the suspension motion of the three-point suspension device with electric cylinder drive applied to a tractor according to the present invention. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0020] Example 1

[0021] See Figs. 1-2The three-point suspension system employed in this invention, compared to traditional large harvesters or heavy engineering equipment, primarily connects agricultural implements to tractors. Therefore, the three-point suspension system is highly effective for small and medium-power agricultural tractors and has a simple structure, allowing for the quick connection of various types of agricultural implements to the tractor. To this end, the electric cylinder-driven three-point suspension system for tractors of this invention includes a lifting arm, an upper tie rod, a lower tie rod, a lifting rod, and a drive mechanism for driving the lifting arm. The lifting arm is mounted on the tractor frame, with one end fixed to the frame and the other end hinged to the upper end of the lifting rod. The lower end of the lifting rod is hinged to the middle position of the lower tie rod. One end of the lower tie rod is hinged to the tractor frame, and the other end is hinged to the lower end of the implement's column. One end of the upper tie rod is hinged to the tractor frame, and the other end is hinged to the upper end of the implement's column.

[0022] In this embodiment, since the three-point suspension device of the present invention has a symmetrical structure in space with reference to the left and right middle planes of the body, the three-point suspension device of the present invention can be projected onto this plane for calculation during the study. The specific projection is as follows: Fig. 1 As shown, AB rod is the lifting arm, GC rod is the upper pull rod, CD rod is the column of the agricultural implement, FD is the lower pull rod, BE is the lifting pull rod; point G is the upper hinge point, F is the projection of the two lower hinge points, point C is the upper suspension point, point D is the projection of the two lower suspension points, and A is the projection of the lifting arm.

[0023] like Fig. 2 As shown, during the suspension motion, the horizontal position of the lower suspension is formed by the lifting arm AB, the upper pull rod GC, the column CD, the lifting tie rod BE, the lower pull rod FD, and the point of application of the lifting force H; the lowest position of the lower suspension is formed by the lifting arm AB1, the upper pull rod GC1, the column C1D1, the lifting tie rod B1E1, the lower pull rod FD1, and the point of application of the lifting force H1; the transport position of the lower suspension is formed by the lifting arm AB2, the upper pull rod GC2, the column C2D2, the lifting tie rod B2E2, the lower pull rod FD2, and the point of application of the lifting force H2. The speed of motion at point H directly determines the power required by the actuator; therefore, the trajectory of point H can be considered as a combination of the motion of point D and the motion of rod CD.

[0024] In operation, the swing angle (i.e., the tilt angle of the agricultural machinery's column CD) varies within a small range, meeting the 0° to -10° range requirement for Class 0 three-point suspension. Based on this small angle variation characteristic, the motion of point H can be approximated as a circular motion with point F as the center and length FH as the radius. Correspondingly, its deflection angle can be calculated using the vertex angle of a special isosceles triangle, with FD as the length of its two legs and the minimum lifting height as its base. Therefore, the deflection angle of the pull rod FD can be calculated using the law of cosines.

[0025]

[0026] Therefore, the elevation of point H can be determined:

[0027]

[0028] Formula for calculating the average power during the H-point lift:

[0029]

[0030] Where: m t Improve the quality of point H;

[0031] The minimum stroke of a linear drive mechanism (such as an electric linear actuator) is:

[0032]

[0033] In the formula: L is the length of the lever arm, representing the rotation angle of the lifting arm.

[0034] The average speed of the drive shaft in the linear drive mechanism is:

[0035]

[0036] In the formula: t H To improve efficiency.

[0037] Based on the above calculations, a suitable servo motor and servo cylinder can be selected according to the motor power and the working speed of the electric actuator.

[0038] See Fig. 1 and Fig. 2 The driving mechanism is a linear drive mechanism, which is an electric push rod or an electric cylinder; the lifting rod BE is an electric cylinder or an electric push rod.

[0039] See Fig. 1 and Fig. 2 The working principle of the three-point suspension device for tractors using electric cylinder transmission, as described in this invention, is as follows:

[0040] When the electric push rod or electric cylinder is working, its drive shaft extends or shortens, and the extension or shortening motion of the drive shaft itself directly drives the pull rod FD to move, thereby driving the overall movement of the three-point suspension device of the present invention.

[0041] Example 2

[0042] The difference between this embodiment and Embodiment 1 is that:

[0043] The lifting arm is rotatably connected to the frame at its middle position; the fixed seat of the linear drive mechanism is hinged to the frame, and the driving end of the linear drive mechanism is hinged to one end of the lifting arm.

[0044] During operation, the electric push rod or electric cylinder actuates, and its drive shaft extends or shortens, thereby pushing the lifting arm to rotate clockwise or counterclockwise, which in turn drives the lifting rod to move the lower rod, thereby driving the overall movement of the three-point suspension device of the present invention.

[0045] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A three-point suspension device for tractors using electric cylinder drive, characterized in that, The device includes a lifting arm, an upper pull rod, a lower pull rod, a lifting tie rod, and a drive mechanism for moving the lifting arm. The lifting arm is mounted on the frame of a tractor, and one end of the lifting arm is hinged to the upper end of the lifting tie rod. The lower end of the lifting tie rod is hinged to the middle position of the lower pull rod. One end of the lower pull rod is hinged to the frame of the tractor, and the other end is hinged to the lower end of the column of the implement. One end of the upper pull rod is hinged to the frame of the tractor, and the other end is hinged to the upper end of the column of the implement.

2. The three-point suspension device for tractors using electric cylinder transmission as described in claim 1, characterized in that, The driving mechanism is a linear driving mechanism.

3. The three-point suspension device for tractors using electric cylinder drive as described in claim 2, characterized in that, The linear drive mechanism is an electric push rod.

4. The three-point suspension device for tractors using electric cylinder drive as described in claim 2, characterized in that, The linear drive mechanism is an electric cylinder.

5. The three-point suspension device for tractors using electric cylinder drive as described in claim 3 or 4, characterized in that, The lifting arm is rotatably connected to the frame at its middle position.

6. The three-point suspension device for tractors using electric cylinder drive as described in claim 5, characterized in that, The fixed seat of the linear drive mechanism is hinged to the frame, and the drive end of the linear drive mechanism is hinged to one end of the lifting arm.

7. The three-point suspension device for tractors using electric cylinder drive as described in claim 3 or 4, characterized in that, One end of the lifting arm is fixed to the frame, and the other end is hinged to the lifting rod.

8. The three-point suspension device for tractors using electric cylinder drive as described in claim 7, characterized in that, The lifting rod is an electric cylinder or an electric push rod.

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