Rear axle suspension device and paddy field operation machine

Abstract

The present invention provides a rear axle suspension device and a paddy field operation machine. The rear axle suspension device includes a frame, a rear axle located below the frame, an elastic member connecting the rear axle and the frame, and a limiting mechanism arranged between the rear axle and the frame. When the tilt angle of the rear axle relative to the frame is not greater than a tilt angle threshold, there is a movable space between at least one of the frame and the rear axle and the limiting mechanism; when the tilt angle of the rear axle relative to the frame reaches the tilt angle threshold, the limiting mechanism locks the frame and the rear axle. The paddy field operation machine includes the rear axle suspension device. When the tilt angle of the rear axle relative to the frame reaches the tilt angle threshold, the limiting mechanism locks the frame and the rear axle, restricting the rear axle from continuing to rotate relative to the frame, thereby ensuring a safe distance between the wheels and the frame and preventing the wheels and the frame from interfering with and colliding with each other.

Description

Technical Field

[0001] The present invention relates to the field of paddy field working machines, and in particular to a rear axle suspension device and a paddy field working machine. Background Art

[0002] A typical paddy field machine typically consists of a frame and a rear axle located at the lower rear end of the frame, which connects to the wheels. The rear axle is connected to the frame via springs, forming a suspension system that allows the rear axle to rotate relative to the frame. Existing suspension systems for paddy field machines only limit the tilt angle of the rear axle by increasing tension through the deformation of buffer springs. This lacks protection for the buffer springs. Excessive tilt can lead to problems such as spring failure, interference between the wheels and the frame, and frame cracking due to excessive freedom. Summary of the Invention

[0003] The object of the present invention is to provide a rear axle suspension device and a paddy field working machine which can prevent wheels from colliding with a frame.

[0004] To achieve one of the above-mentioned objects of the invention, one embodiment of the present invention provides a rear axle suspension device, comprising a frame, a rear axle located below the frame, and an elastic member connecting the rear axle and the frame; the rear axle suspension device also includes a limiting mechanism arranged between the rear axle and the frame, when the inclination angle of the rear axle relative to the frame is not greater than an inclination angle threshold, there is a movable space between at least one of the frame and the rear axle and the limiting mechanism; when the inclination angle of the rear axle relative to the frame reaches the inclination angle threshold, the limiting mechanism locks the frame and the rear axle.

[0005] As a further preferred embodiment of the present invention, the limiting mechanism includes a buffer pad, which is installed on the side of the rear axle facing the frame or the side of the frame facing the rear axle; when the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the buffer pad is in a compression threshold state, and the two ends of the buffer pad respectively abut against the rear axle and the frame.

[0006] As a further preferred embodiment of the present invention, the buffer pad includes a first buffer pad installed on the side of the rear axle facing the frame and a second buffer pad installed on the side of the first buffer pad facing away from the rear axle; or, the buffer pad includes a first buffer pad installed on the side of the frame facing the rear axle and a second buffer pad installed on the side of the first buffer pad facing away from the frame;

[0007] One of the first buffer pad and the second buffer pad is an elastic pad, and the other is a rigid pad.

[0008] As a further preferred embodiment of the present invention, the limiting mechanism includes a limiting rod, a first limiting portion and a second limiting portion located on the limiting rod;

[0009] The frame and the rear axle are both provided with mounting holes, the limiting rod is passed through the mounting holes, the first limiting portion is provided on a side of the frame away from the rear axle, and the second limiting portion is provided on a side of the rear axle away from the frame;

[0010] When the inclination angle of the rear axle relative to the frame is not greater than the inclination angle threshold, the distance between the first limiting portion and the second limiting portion is greater than the distance from the side of the frame away from the rear axle to the side of the rear axle away from the frame;

[0011] When the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the first limiting portion abuts against the side of the frame away from the rear axle, and the second limiting portion abuts against the side of the rear axle away from the frame.

[0012] As a further preferred embodiment of the present invention, the limiting rod is a screw rod, and the first limiting portion and the second limiting portion are bolts screwed onto the limiting rod.

[0013] As a further preferred embodiment of the present invention, the cushion is provided with perforations;

[0014] The limiting mechanism also includes:

[0015] a limiting rod movably disposed in the through hole and in the mounting holes on the frame and the rear axle;

[0016] a first limiting portion and a second limiting portion located on the limiting rod, wherein the first limiting portion is disposed on a side of the frame away from the rear axle, and the second limiting portion is disposed on a side of the rear axle away from the frame;

[0017] When the inclination angle of the rear axle relative to the frame is not greater than the inclination angle threshold, the distance between the first limiting portion and the second limiting portion is greater than the distance from the side of the frame away from the rear axle to the side of the rear axle away from the frame;

[0018] When the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the buffer pad is in a compression threshold state, and both ends of the buffer pad respectively abut against the rear axle and the frame; the first limiting portion abuts against the side of the frame away from the rear axle, and the second limiting portion abuts against the side of the rear axle away from the frame.

[0019] As a further preferred embodiment of the present invention, two groups of limiting mechanisms are arranged between the frame and the rear axle and spaced apart in the horizontal direction. When the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, both groups of limiting mechanisms lock the frame and the rear axle.

[0020] As a further preferred embodiment of the present invention, one group of the limiting mechanisms includes a buffer pad, and the other group of the limiting mechanisms includes a limiting rod, a first limiting portion and a second limiting portion located on the limiting rod; mounting holes are provided on both the frame and the rear axle, the limiting rod passes through the mounting holes, the first limiting portion is provided on a side of the frame away from the rear axle, and the second limiting portion is provided on a side of the rear axle away from the frame;

[0021] When the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the buffer pad is in a compression threshold state, and both ends of the buffer pad respectively abut against the rear axle and the frame, the first limiting portion abuts against the side of the frame away from the rear axle, and the second limiting portion abuts against the side of the rear axle away from the frame.

[0022] As a further preferred embodiment of the present invention, the rear axle suspension device also includes a support plate and a rotating shaft, the support plate is fixedly mounted on the frame, and the rear axle is mounted on the support plate via the rotating shaft, the rear axle rotates around the rotating shaft, one end of the elastic member is connected to the support plate, and the other end is connected to the rear axle.

[0023] To achieve one of the above-mentioned objectives of the invention, one embodiment of the present invention provides a paddy field working machine, comprising the aforementioned rear axle suspension device.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: when the inclination angle of the rear axle relative to the frame is not greater than the inclination angle threshold, the limiting mechanism will not restrict the rotation of the rear axle relative to the frame; when the inclination angle of the rear axle relative to the frame reaches the inclination angle threshold, the limiting mechanism locks the frame and the rear axle, restricting the rear axle from continuing to rotate relative to the frame, thereby ensuring a safe distance between the wheels and the frame, preventing the wheels and the frame from interfering with and colliding with each other, and at the same time, the limiting mechanism protects the elastic member to avoid collapse of the elastic member, and the limiting mechanism prevents the frame from cracking by limiting the degree of freedom of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a front view of a rear axle suspension device according to one embodiment of the present invention;

[0026] Figure 2 is a left side view of a rear axle suspension device according to one embodiment of the present invention;

[0027] Figure 31 is a schematic structural diagram of a first type of limiting mechanism according to an embodiment of the present invention;

[0028] Figure 4 1 is a schematic structural diagram of a second type of limiting mechanism according to an embodiment of the present invention;

[0029] Figure 5 1 is a schematic structural diagram of a third type of limiting mechanism according to an embodiment of the present invention;

[0030] Figure 6 1 is a schematic structural diagram of a case where the limiting mechanism is provided in two groups according to an embodiment of the present invention;

[0031] Figure 7 This is a structural diagram of an embodiment of the present invention when both sets of limiting mechanisms are of the third type;

[0032] Among them, 10, frame; 20, rear axle; 30, elastic member; 40, limiting mechanism; 41, buffer pad; 411, first buffer pad; 412, second buffer pad; 42, limiting rod; 421, first limiting part; 422, second limiting part; 50, support plate; 60, rotating shaft. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0034] In the various drawings of the present invention, for the sake of convenience, some sizes of structures or parts are exaggerated relative to other structures or parts, and thus, only the basic structure of the subject matter of the present invention is illustrated.

[0035] like Figure 1 and Figure 2 As shown, the present invention provides a rear axle suspension device that can be applied to a paddy field working machine.

[0036] The rear axle suspension device includes a frame 10 , a rear axle 20 , an elastic member 30 and a limiting mechanism 40 .

[0037] When the rear axle suspension device is applied to a paddy field machine, the frame 10 is the main body of the paddy field machine, and both ends of the rear axle 20 are transmission systems for connecting the wheels at the rear side of the paddy field machine.

[0038] The rear axle 20 is located below and spaced apart from the frame 10, and can rotate relative to the frame 10. An elastic member 30, such as a spring, connects the rear axle 20 to the frame 10. When the rear axle suspension system shakes, the rear axle 20 rotates relative to the frame 10. The elastic member 30's elastic deformation cushions the relative motion between the frame 10 and the rear axle 20.

[0039] The limiting mechanism 40 is disposed between the rear axle 20 and the frame 10. When the tilt angle of the rear axle 20 relative to the frame 10 is no greater than a threshold tilt angle, there is room for movement between the limiting mechanism 40 and at least one of the frame 10 and the rear axle 20. In this case, the limiting mechanism 40 does not restrict relative movement between the rear axle 20 and the frame 10. When the tilt angle of the rear axle 20 relative to the frame 10 reaches the threshold tilt angle, the limiting mechanism 40 locks the frame 10 and the rear axle 20.

[0040] The limiting mechanism 40 restricts the rotation of the rear axle 20 relative to the frame 10 after the tilt angle reaches a preset value, thereby maintaining a safe distance between the wheels and the frame 10 and preventing interference and collision between the wheels and the frame 10. The limiting mechanism 40 also prevents excessive elastic deformation of the elastic member 30, protecting the elastic member 30 and preventing its collapse. By limiting the degrees of freedom of the frame 10, the limiting mechanism 40 reduces its shaking and prevents cracking.

[0041] See Figure 2 In one embodiment of the present invention, the rear axle suspension device further includes a support plate 50 and a rotation shaft 60. The support plate 50 is fixedly mounted to the frame 10. The rear axle 20 is mounted to the support plate 50 via the rotation shaft 60. When the rear axle 20 rotates about the rotation shaft 60, the inclination angle of the rear axle 20 relative to the frame 10 changes. The connection point between the rear axle 20 and the rotation shaft 60 is approximately located in the middle of the frame.

[0042] The elastic member 30 is a spring, with its top end connected to the support plate 50 and its bottom end connected to the rear axle 20. To enhance the stability of the rear axle suspension, two elastic members 30 are symmetrically located on either side of the support plate 50. Furthermore, the elastic members 30 are arranged at an angle, with the distance between the top ends of the two elastic members 30 being smaller than the distance between their bottom ends.

[0043] The limiting mechanism 40 can limit the rear axle 20 from moving in a direction close to the frame 10 by a buffering structure, or can limit the rear axle 20 from moving in a direction away from the frame 10 by a structure providing a pulling force.

[0044] like Figure 3 As shown, one embodiment of the present invention provides a limiting mechanism 40, which includes a buffer pad 41. The buffer pad 41 can be installed on the side of the rear axle 20 facing the frame 10, or on the side of the frame 10 facing the rear axle 20.

[0045] When the inclination angle of the rear axle 20 relative to the frame 10 reaches the inclination angle threshold, the buffer pad 41 is in a compression threshold state, and both ends of the buffer pad 41 respectively abut against the rear axle 20 and the frame 10, and at this time the buffer pad 41 is compressed to the limit position.

[0046] This embodiment illustrates the structure of the buffer pad 41 using the example of a buffer pad 41 installed on the side of the rear axle 20 facing the frame 10. The buffer pad 41 includes a first buffer pad 411 installed on the side of the rear axle 20 facing the frame 10, and a first buffer pad 412 installed on the side of the first buffer pad 411 facing away from the rear axle 20. One of the first buffer pads 411 and 412 is an elastic pad, and the other is a rigid pad. The elastic pad of the first buffer pad 411 and the first buffer pad 412 is used to provide deformation when the buffer pad 41 is squeezed, while the rigid pad prevents excessive deformation of the buffer pad 41 when compressed, which could cause a collision between the wheel and the frame 10.

[0047] Of course, the buffer pad 41 may also include a first buffer pad installed on the side of the frame 10 facing the rear axle 20 and a second buffer pad installed on the side of the first buffer pad facing away from the frame 10 , which can also play a corresponding role.

[0048] When the rear axle suspension device sways left or right, the rear axle 20 begins to rotate relative to the frame 10. The position of the rear axle 20 where the cushion 41 is mounted moves toward the frame 10. The cushion 41 begins to compress under the squeeze of the rear axle 20 and the frame 10. The cushion 41, in conjunction with the elastic member 30, acts as a buffer, improving the stability of the frame 10. At the same time, the pressure of the cushion 41 and the rear axle 20 neutralizes the bending moment of the elastic member 30 on the rear axle 20. When the inclination angle of the rear axle 20 relative to the frame 10 reaches a threshold inclination angle, the cushion 41 is compressed to its limit position, i.e., the cushion 41 is in a compression threshold state. At this point, the cushion 41 prevents the rear axle 20 from rotating further toward the frame 10, thereby maintaining a safe distance between the wheels and the frame 10 and protecting the elastic member 30 from collapse.

[0049] like Figure 4 As shown, one embodiment of the present invention provides a second limiting mechanism 40 , which includes a limiting rod 42 and a first limiting portion 421 and a second limiting portion 422 located on the limiting rod 42 .

[0050] The frame 10 and the rear axle 20 are both provided with mounting holes extending in an upward and downward direction. A limiting rod 42 is provided in the mounting holes, with a first limiting portion 421 provided on the side of the frame 10 facing away from the rear axle 20, and a second limiting portion 422 provided on the side of the rear axle 20 facing away from the frame 10.

[0051] When the rear axle suspension device swings left or right, the rear axle 20 begins to rotate relative to the frame 10, and the position where the limit rod 42 of the rear axle 20 is mounted moves away from the frame 10. When the tilt angle of the rear axle 20 relative to the frame 10 is not greater than the tilt angle threshold, the distance between the first limit portion 421 and the second limit portion 422 is greater than the distance from the side of the frame 10 facing away from the rear axle 20 to the side of the rear axle 20 facing away from the frame 10. In this case, the first limit portion 421 and the second limit portion 422 do not hinder the rotation of the rear axle 20 relative to the frame 10. When the inclination angle of the rear axle 20 relative to the frame 10 reaches the inclination angle threshold, the first limiting portion 421 abuts the side of the frame 10 away from the rear axle 20, and the second limiting portion 422 abuts the side of the rear axle 20 away from the frame 10. At this time, the first limiting portion 421 and the second limiting portion 422 provide a pulling force to prevent the rear axle 20 from continuing to rotate relative to the frame 10, thereby ensuring a safe distance between the wheel and the frame 10, and at the same time protecting the elastic member 30 and preventing the elastic member 30 from collapsing.

[0052] Furthermore, the limiting rod 42 is a screw rod, and the first limiting portion 421 and the second limiting portion 422 are bolts screwed onto the limiting rod 42. By adjusting the positions of the first limiting portion 421 and the second limiting portion 422 on the limiting rod 42, the limiting amount of the limiting mechanism 40 can be adjusted.

[0053] like Figure 5 As shown, one embodiment of the present invention provides a third limiting mechanism 40, which includes a buffer pad 41 and a limiting rod 42. The structures of the buffer pad 41 and the limiting rod 42 are respectively identical to those of the first limiting mechanism 40 and the second limiting mechanism 40, and will not be further described in this embodiment. The limiting mechanism 40 can provide a locking and limiting function in two directions. When the rear axle suspension device shakes, regardless of whether the rear axle 20 rotates counterclockwise or clockwise relative to the frame 10, that is, regardless of whether the position corresponding to the rear axle 20 and the limiting mechanism 40 is close to or far from the frame 10, the limiting mechanism 40 can achieve locking and limiting.

[0054] Furthermore, the cushion pad 41 is provided with a perforation, and the limiting rod 42 is movably provided in the perforation. The limiting rod 42 can play the role of fixing and supporting the cushion pad 41, and the cushion pad 41 does not need to be provided with an additional mounting structure to be mounted on the rear axle 20, thereby simplifying the structure.

[0055] like Figure 6As shown, in one embodiment of the present invention, two sets of limiting mechanisms 40 are disposed between the frame 10 and the rear axle 20, spaced apart horizontally. When the tilt angle of the rear axle 20 relative to the frame 10 reaches a threshold tilt angle, both sets of limiting mechanisms 40 lock the frame 10 and the rear axle 20. The two sets of limiting mechanisms 40 are located on either side of the rotation axis 60, for example, in the left and right directions. The two sets of limiting mechanisms 40 provide limiting functions on the left and right sides, respectively, to prevent the frame 10 from colliding with the rear wheels due to failure of the limiting mechanisms 40 on one side.

[0056] One group of limiting mechanisms 40 may adopt the first limiting mechanism 40 with a buffer pad 41 provided in the above embodiment of the present invention, and the other group of limiting mechanisms 40 may adopt the second limiting mechanism 40 with a limiting rod 42 provided in the above embodiment of the present invention.

[0057] When the inclination angle of the rear axle 20 relative to the frame 10 reaches the inclination angle threshold, the buffer pad 41 is in the compression threshold state, and the two ends of the buffer pad 41 respectively abut against the rear axle 20 and the frame 10, the first limiting portion 421 abuts the side of the frame 10 away from the rear axle 20, and the second limiting portion 422 abuts the side of the rear axle 20 away from the frame 10.

[0058] like Figure 7 As shown, preferably, both sets of limiting mechanisms 40 adopt the third limiting mechanism 40 provided in the above embodiment of the present invention, which has both a limiting rod 42 and a buffer pad 41. When the rear axle suspension device swings left and right, the rear axle 20 repeatedly switches between counterclockwise and clockwise rotation around the rotation axis 60.

[0059] When the rear axle 20 rotates clockwise, the buffer pad 41 of the left limiting mechanism 40 is compressed, acting as a buffer. When the buffer pad 41 is compressed to the limit position, the limiting rod 42 of the right limiting mechanism 40 pulls the rear axle 20 and the frame 10 through the first limiting portion 421 and the second limiting portion 422. The limiting mechanisms 40 on both sides restrict the rear axle 20 from further clockwise rotation. When the rear axle 20 rotates counterclockwise, the buffer pad 41 of the right limiting mechanism 40 is compressed, acting as a buffer. When the buffer pad 41 is compressed to the limit position, the limiting rod 42 of the left limiting mechanism 40 pulls the rear axle 20 and the frame 10 through the first limiting portion 421 and the second limiting portion 422. The limiting mechanisms 40 on both sides restrict the rear axle 20 from further counterclockwise rotation.

[0060] The present invention also provides a paddy field machine, comprising the above-mentioned rear axle suspension device. The wheels on the rear side of the paddy field machine are mounted on both ends of the rear axle 20. When the hydropower machine is in operation, if the road is bumpy and causes the rear axle 20 to rotate relative to the frame 10, the elastic member 30 of the rear axle suspension device can buffer the rear axle 20 and the frame 10. The limiting mechanism 40 prevents the wheels and the frame 10 from colliding with each other when the entire paddy field machine has a large swing amplitude, while protecting the elastic member 30 and reducing the shaking of the frame 10 to prevent the frame 10 from cracking. When the limiting mechanism 40 includes a buffer pad 41, the buffer pad 41 cooperates with the elastic member 30 to increase the torque required for the paddy field machine to swing, thereby improving the stability of the vehicle body.

[0061] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rear axle suspension device, comprising a frame, a rear axle located below the frame, and an elastic member connecting the rear axle and the frame; characterized in that: The rear axle suspension device further includes a support plate and a rotating shaft, wherein the support plate is fixedly mounted on the frame, and the rear axle is mounted on the support plate via the rotating shaft, wherein the position where the rear axle is connected to the rotating shaft is approximately located in the middle thereof, and the rear axle rotates around the rotating shaft, and one end of the elastic member is connected to the support plate, and the other end is connected to the rear axle; the number of the elastic members is two, and they are symmetrically distributed on both sides of the support plate; The rear axle suspension device further includes a limiting mechanism disposed between the rear axle and the frame, the limiting mechanism being disposed at both ends of the rear axle and the frame spaced apart from the support plate in a horizontal direction, including a portion located on a side of the rear axle facing the frame or a portion of the frame facing the rear axle; When the inclination angle of the rear axle relative to the frame is not greater than the inclination angle threshold, there is movable space between at least one of the frame and the rear axle and the limiting mechanism; when the inclination angle of the rear axle relative to the frame reaches the inclination angle threshold, the limiting mechanism locks the frame and the rear axle.

2. The rear axle suspension device according to claim 1, characterized in that: The limiting mechanism includes a buffer pad, which is installed on the side of the rear axle facing the frame or the side of the frame facing the rear axle; when the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the buffer pad is in a compression threshold state, and the two ends of the buffer pad respectively abut against the rear axle and the frame.

3. The rear axle suspension device according to claim 2, characterized in that: The buffer pad includes a first buffer pad installed on the side of the rear axle facing the frame and a second buffer pad installed on the side of the first buffer pad facing away from the rear axle; or, the buffer pad includes a first buffer pad installed on the side of the frame facing the rear axle and a second buffer pad installed on the side of the first buffer pad facing away from the frame; One of the first buffer pad and the second buffer pad is an elastic pad, and the other is a rigid pad.

4. The rear axle suspension device according to any one of claims 1 to 3, characterized in that: The limiting mechanism includes a limiting rod, a first limiting portion and a second limiting portion located on the limiting rod; The frame and the rear axle are both provided with mounting holes, the limiting rod is passed through the mounting holes, the first limiting portion is provided on a side of the frame away from the rear axle, and the second limiting portion is provided on a side of the rear axle away from the frame; When the inclination angle of the rear axle relative to the frame is not greater than the inclination angle threshold, the distance between the first limiting portion and the second limiting portion is greater than the distance from the side of the frame away from the rear axle to the side of the rear axle away from the frame; When the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the first limiting portion abuts against the side of the frame away from the rear axle, and the second limiting portion abuts against the side of the rear axle away from the frame.

5. The rear axle suspension device according to claim 4, characterized in that: The limiting rod is a screw rod, and the first limiting portion and the second limiting portion are bolts screwed onto the limiting rod.

6. The rear axle suspension device according to claim 2, characterized in that: The buffer pad is provided with perforations; The limiting mechanism also includes: a limiting rod movably disposed in the through hole and in the mounting holes on the frame and the rear axle; a first limiting portion and a second limiting portion located on the limiting rod, wherein the first limiting portion is disposed on a side of the frame away from the rear axle, and the second limiting portion is disposed on a side of the rear axle away from the frame; When the inclination angle of the rear axle relative to the frame is not greater than the inclination angle threshold, the distance between the first limiting portion and the second limiting portion is greater than the distance from the side of the frame away from the rear axle to the side of the rear axle away from the frame; When the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the buffer pad is in a compression threshold state, and both ends of the buffer pad respectively abut against the rear axle and the frame; the first limiting portion abuts against the side of the frame away from the rear axle, and the second limiting portion abuts against the side of the rear axle away from the frame.

7. The rear axle suspension device according to claim 1, characterized in that: Two groups of limiting mechanisms are arranged between the frame and the rear axle and are spaced apart in the horizontal direction. When the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the two groups of limiting mechanisms lock the frame and the rear axle.

8. The rear axle suspension device according to claim 7, characterized in that: One group of the limiting mechanisms includes a buffer pad, and the other group of the limiting mechanisms includes a limiting rod, a first limiting portion and a second limiting portion located on the limiting rod; the frame and the rear axle are both provided with mounting holes, the limiting rod passes through the mounting holes, the first limiting portion is provided on a side of the frame away from the rear axle, and the second limiting portion is provided on a side of the rear axle away from the frame; When the inclination angle of the rear axle relative to the frame reaches an inclination angle threshold, the buffer pad is in a compression threshold state, and both ends of the buffer pad respectively abut against the rear axle and the frame, the first limiting portion abuts against the side of the frame away from the rear axle, and the second limiting portion abuts against the side of the rear axle away from the frame.

9. A paddy field working machine, characterized in that: The rear axle suspension device comprises the rear axle suspension device according to any one of claims 1 to 8.

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