Rear gearbox and four-wheel riding type mini-tiller

Abstract

The utility model belongs to the technical field of agricultural machinery, and particularly relates to a rear gearbox which comprises a first transmission shaft, a second transmission shaft, a first-stage speed change mechanism, a third transmission shaft and a second-stage speed change mechanism, and the first-stage speed change mechanism can switch various first-stage gears to change the transmission ratio between the first transmission shaft and the second transmission shaft. The two-stage speed change mechanism can switch various two-stage gears to change the transmission ratio between the second transmission shaft and the third transmission shaft; by arranging the first-stage speed change mechanism and the second-stage speed change mechanism, the total gear number in the rear gearbox is increased, and various tillage requirements can be met; the utility model further particularly relates to a four-wheel riding type mini-tiller, and the four-wheel riding type mini-tiller is combined with gears of a front gearbox and can meet the use requirements of various walking and tillage modes.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a rear gearbox and a four-wheel riding micro-tillage machine. Background Art

[0002] The four-wheel ride-on micro-tiller is an agricultural machine that combines the flexibility of a traditional micro-tiller with the driving comfort. It includes a front gearbox and a rear gearbox. The front gearbox is mainly used to control the speed of the walking wheels, and the rear gearbox is mainly used to control the speed of the tillage tools.

[0003] In a four-wheeled riding tiller, the rear gearbox uses the shift fork shaft to shift the shift gear to engage with different transmission gears, thereby adjusting the rotation speed of the tillage tool. However, in different tillage environments, the types, specifications, and rotation speeds of the tillage tools required are different. The current rear gearbox can generally only switch between two gears, and its scope of application is relatively small. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a rear transmission with an increased total number of gear positions.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A rear transmission includes a first transmission shaft, a second transmission shaft and a first-stage transmission mechanism, wherein the first-stage transmission mechanism can switch between multiple first-stage gears to change the transmission ratio between the first transmission shaft and the second transmission shaft; and further includes a third transmission shaft and a second-stage transmission mechanism, wherein the second-stage transmission mechanism can switch between multiple second-stage gears to change the transmission ratio between the second transmission shaft and the third transmission shaft.

[0007] Working principle: Power is transmitted from the front gearbox to the rear gearbox. In the rear gearbox, power is transmitted to the rear travel wheels or tillage implements through the first drive shaft, the second drive shaft, and the third drive shaft in sequence. The transmission ratio between the first drive shaft and the second drive shaft is changed through the first-stage speed change mechanism, and the transmission ratio between the second drive shaft and the third drive shaft is changed through the second-stage speed change mechanism, so that the total number of gears in the rear gearbox is equal to the number of first-stage gears multiplied by the number of second-stage gears.

[0008] Compared with the prior art, the beneficial effects of the present invention are:

[0009] By setting up a first-speed transmission mechanism and a second-speed transmission mechanism, the total number of gears in the rear gearbox is increased, which can be applied to various farming needs.

[0010] As a preferred embodiment of the present invention, the first-stage speed change mechanism includes a first double gear that can slide axially along the first transmission shaft, and two first transmission gears are fixedly installed on the second transmission shaft. When adjusting the gear, the first double gear is slid, so that the corresponding side of the first double gear can slide to engage with the corresponding first transmission gear.

[0011] Beneficial effect: The first double gear is pushed to slide along the first transmission shaft by the first shift fork rod. The gear radii on both sides of the first double gear are different. When the corresponding sides are engaged with the corresponding first transmission gear, different transmission ratios are formed, thereby realizing gear switching.

[0012] As a preferred embodiment of the present invention, the two-stage speed change mechanism includes a second double gear that can slide axially along the second transmission shaft, and two second transmission gears are fixedly mounted on the third transmission shaft. When adjusting the gear, the second double gear is slid so that the corresponding side of the second double gear slides to engage with the corresponding second transmission gear.

[0013] Beneficial effect: The shifting principle of the two-stage speed change mechanism is the same as that of the one-stage speed change mechanism. The first transmission shaft transmits power to the second transmission shaft for one-stage speed change, and then transmits it to the third transmission shaft for two-stage speed change to achieve multi-gear adjustment.

[0014] As a preferred embodiment of the present invention, the first-stage speed change mechanism includes a first shift fork rod and a first rotating part, and the second-stage speed change mechanism includes a second shift fork rod and a second rotating part. The first shift fork rod and the second shift fork rod are both installed on the transmission housing for transverse sliding. A control handle is provided on the outside of the transmission housing. The control handle controls the first rotating part to rotate in the Z-axis direction, or controls the second rotating part to rotate in the Y-axis direction, so that the first rotating part pushes the first shift fork rod to slide, or the other end of the second rotating part pushes the second shift fork rod to slide.

[0015] Beneficial effect: Through a single control handle, by rotating in two directions, the first-stage speed change mechanism and the second-stage speed change mechanism can be controlled to shift gears respectively, the overall space occupied is smaller, and costs are saved.

[0016] As a preferred embodiment of the present invention, the second shift fork lever is vertically provided with a second slot on the outer side of the gearbox housing, the second rotating portion includes a second rotating plate and a second extension rod, one end of the second extension rod extends below the seat and is connected to the control handle through a hinge portion, the other end of the second extension rod is fixedly connected to one end of the second rotating plate, and the other end of the second rotating plate extends into the second slot;

[0017] When the control handle rotates around the Y-axis, the second rotating plate is controlled to push the second shift fork rod.

[0018] Beneficial effect: By rotating the control handle around the Y-axis, the second rotating plate can be driven to rotate through the second extension rod, so that the end of the second rotating plate can swing left and right about the rotation center, thereby pushing the second fork rod laterally, and the second fork rod pushes the second double gear to shift gears.

[0019] As a preferred embodiment of the present invention, the first shift fork lever is provided with a first clamping groove transversely on the outer side of the gearbox housing, the first rotating part comprises a V-shaped plate, a first extension rod and a center rod installed on the outer side of the gearbox housing, one end of the V-shaped plate extends into the clamping groove, the middle of the V-shaped plate is provided with a first through hole, and is rotatably mounted on the center rod through the first through hole. The other end of the V-shaped plate is provided with a second through hole, both ends of the first extension rod are bent upward, one end of the first extension rod is rotatably connected to the second through hole, a plate body is welded on the control handle, a strip hole is vertically provided on the plate body, the other end of the first extension rod passes through the strip hole, the upper part of the control handle is fixedly connected with the plate body against the outer side of the hinge part, and is located above the control handle;

[0020] When the control handle rotates around the Z-axis, it drives the plate to move forward and backward along the Y-axis.

[0021] When the control handle rotates around the Y-axis, the other end of the first extension rod can move in the strip-shaped hole.

[0022] Beneficial effect: The control handle drives the plate body to move back and forth in the Y-axis direction, which will pull one side of the V-shaped plate, causing the V-shaped plate to rotate as a whole around the center rod, thereby pushing the first shift fork rod. Since the control handle is hinged to the second extension rod, when the control handle rotates around the Z-axis direction, it will not drive the second extension rod to rotate. When the control handle rotates around the Y-axis direction, the rotation angle required for shifting gears is small. Therefore, although the plate body will follow the control handle to rotate around the Y-axis direction, the plate body moves less. By setting the strip hole, the movement of the plate body can be prevented from affecting the first extension rod.

[0023] As a preferred embodiment of the present invention, the first shift fork rod and the second shift fork rod are both spaced apart and provided with a plurality of arc grooves in the rear gearbox housing, each arc groove corresponds to a first gear position or a second gear position, and two elastic members are fixedly connected to the inner wall of the rear gearbox housing, and the two elastic members are respectively tightened in the corresponding arc grooves.

[0024] Beneficial effect: by setting the arc groove and the elastic member, the elastic member is pressed tightly against the arc groove. When no external force is applied or the applied force is small, the elastic member cannot be separated from the arc groove, and the first fork rod and the second fork rod can be positioned.

[0025] The second object of the present invention is to provide a four-wheeled riding micro-tillage machine, which adopts the rear gearbox described above and combines the gear positions of the front gearbox to meet the use requirements of various walking and tillage modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of an embodiment of the rear gearbox of the utility model;

[0027] Figure 2 This is a schematic structural diagram of the gear transmission portion of the rear gearbox embodiment of the present invention;

[0028] Figure 3 This is a schematic structural diagram of the transmission portion of the control handle in the embodiment of the rear gearbox of the present invention;

[0029] Figure 4 yes Figure 3 A magnified view of the structure at A;

[0030] Figure 5 The utility model is a structural schematic diagram of an embodiment of a four-wheel ride-on micro-tillage machine.

[0031] The accompanying drawings include: a first transmission shaft 1, a second transmission shaft 2, a third transmission shaft 3, a first-stage speed change mechanism 4, a first shift fork rod 41, a first slot 411, a first duplex gear 42, a first transmission gear 43, a first rotating part 44, a V-shaped plate 441, a first extension rod 442, a center rod 443, a second-stage speed change mechanism 5, a second shift fork rod 51, a second slot 511, a second duplex gear 52, a second transmission gear 53, a second rotating part 54, a second rotating plate 541, a second extension rod 542, an arc-shaped groove 55, an elastic member 6, a control handle 7, a hinge part 71, a plate body 72, a strip hole 73, a seat 8, a four-wheeled riding micro-tiller 9, and a rear walking wheel transmission shaft 10. DETAILED DESCRIPTION

[0032] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes and are not intended to limit the present invention.

[0033] In the description of this application, the terms "first", "second", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0034] See also Figure 1As shown, the rear gearbox of this embodiment includes a first transmission shaft 1, a second transmission shaft 2, a third transmission shaft 3, a first-stage speed change mechanism 4, and a second-stage speed change mechanism 5. The first-stage speed change mechanism 4 can switch between multiple first-stage gears to change the transmission ratio between the first transmission shaft 1 and the second transmission shaft 2, and the second-stage speed change mechanism 5 can switch between multiple second-stage gears to change the transmission ratio between the second transmission shaft 2 and the third transmission shaft 3; power is transmitted from the front gearbox to the rear gearbox, and in the rear gearbox, power is transmitted to the rear walking wheel drive shaft 10 and the rear walking wheel drive shaft 10 in sequence through the first transmission shaft 1, the second transmission shaft 2, and the third transmission shaft 3; by setting the first-stage speed change mechanism 4 and the second-stage speed change mechanism 5, the total number of gears in the rear gearbox is increased, which can be suitable for various farming needs.

[0035] Among them, see Figure 2 As shown, the first-stage speed change mechanism 4 includes a first shift fork rod 41 and a first double gear 42. The first double gear 42 is slidably mounted on the first transmission shaft 1, and two first transmission gears 43 are fixedly mounted on the second transmission shaft 2. The first shift fork rod 41 shifts the first double gear 42 so that the corresponding side of the first double gear 42 slides to engage with the corresponding first transmission gear 43; the first shift fork rod 41 pushes the first double gear 42 to slide along the first transmission shaft 1. The gear radii on both sides of the first double gear 42 are different. When the corresponding sides engage with the corresponding first transmission gear 43, different transmission ratios are formed, thereby realizing gear switching.

[0036] Among them, see Figure 2 As shown, the two-stage speed change mechanism 5 includes a second shift fork rod 51 and a second double gear 52, the second double gear 52 is slidably installed on the second transmission shaft 2, and two second transmission gears 53 are fixedly installed on the third transmission shaft 3. The second shift fork rod 51 shifts the second double gear 52 so that the corresponding side of the second double gear 52 slides to engage with the corresponding second transmission gear 53; the shifting principle of the two-stage speed change mechanism 5 is the same as that of the one-stage speed change mechanism 4. The first transmission shaft 1 transmits power to the second transmission shaft 2 for a first-stage speed change, and then transmits it to the third transmission shaft 3 for a second-stage speed change to achieve multi-gear adjustment.

[0037] Among them, see Figure 3As shown, the first-stage speed change mechanism 4 also includes a first rotating part 44, and the second-stage speed change mechanism 5 also includes a second rotating part 54. The first fork rod 41 and the second fork rod 51 are both installed on the transmission housing for transverse sliding. A control handle 7 is provided on the outside of the transmission housing. The control handle 7 controls the first rotating part 44 to rotate in the Z-axis direction, or controls the second rotating part 54 to rotate in the Y-axis direction, so that the first rotating part 44 pushes the first fork rod 41 to slide, or the other end of the second rotating part 54 pushes the second fork rod 51 to slide; by rotating in two directions with a single control handle 7, the first-stage speed change mechanism 4 and the second speed change mechanism can be controlled to shift gears respectively, and the overall space occupied is smaller, saving costs.

[0038] In this embodiment, the Y-axis direction is parallel to the forward direction of the four-wheel riding micro-tillage machine, and the Z-axis direction is vertically perpendicular to the Y-axis direction.

[0039] Among them, see Figure 2 and Figure 3 As shown, the second shift fork rod 51 is vertically provided with a second slot 511 on the outside of the gearbox housing, and the second rotating part 54 includes a second rotating plate 541 and a second extension rod 542. One end of the second extension rod 542 extends to the bottom of the seat 8 and is connected to the control handle 7 through a hinge part 71. The other end of the second extension rod 542 is fixedly connected to one end of the second rotating plate 541, and the other end of the second rotating plate 541 extends into the second slot 511; rotating the control handle 7 around the Y-axis direction can drive the second rotating plate 541 to rotate through the second extension rod 542, so that the end of the second rotating plate 541 can swing left and right at the center of rotation, thereby pushing the second shift fork rod 51 laterally, and the second shift fork rod 51 pushes the second double gear 52 to shift gears.

[0040] Among them, see Figure 3 and Figure 4As shown, the first shift fork rod 41 is provided with a first slot 411 transversely on the outside of the gearbox housing, the first rotating part 44 includes a V-shaped plate 441, a first extension rod 442 and a center rod 443 installed on the outside of the gearbox housing, one end of the V-shaped plate 441 extends into the slot, the middle of the V-shaped plate 441 is provided with a first through hole, and is rotatably installed on the center rod 443 through the first through hole, the other end of the V-shaped plate 441 is provided with a second through hole, both ends of the first extension rod 442 are bent upward, and one end of the first extension rod 442 is rotatably connected to the second through hole, a plate body 72 is welded on the control handle 7, and a strip hole 73 is vertically provided on the plate body 72, and the other end of the first extension rod 442 passes through the strip hole 73, and the upper part of the control handle 7 is fixedly connected with the plate body 72 to press against the outer side of the hinge part 71 and is located at the control handle 7 When the control handle 7 is rotated about the Z-axis, the plate body 72 is driven to move forward and backward in the Y-axis direction; when the control handle 7 is rotated about the Y-axis, the other end of the first extension rod 442 can move in the strip hole 73; the control handle 7 drives the plate body 72 to move forward and backward in the Y-axis direction, which will pull one side of the V-shaped plate 441, so that the V-shaped plate 441 as a whole rotates about the center rod 443, thereby pushing the first shift fork rod 41, and because the control handle 7 is hinged to the second extension rod 542, when the control handle 7 is rotated about the Z-axis, it will not drive the second extension rod 542 to rotate. When the control handle 7 is rotated about the Y-axis, since the rotation angle required for shifting gears is small, although the plate body 72 will follow the control handle 7 to rotate about the Y-axis, the movement of the plate body 72 is small. By providing the strip hole 73, the movement of the plate body 72 can be prevented from affecting the first extension rod 442.

[0041] Among them, see Figure 1 As shown, the first shift fork rod 41 and the second shift fork rod 51 are both provided with a plurality of arc grooves 55 at intervals in the rear gearbox housing, each arc groove 55 corresponds to a first gear position or a second gear position, and two elastic members 6 are fixedly connected to the inner wall of the rear gearbox housing, and the two elastic members 6 are respectively pressed tightly in the corresponding arc grooves 55; by setting the arc grooves 55 and the elastic members 6, the elastic members 6 are pressed tightly, and when no external force is applied or the applied force is small, the elastic member 6 cannot be separated from the arc groove 55, so the first shift fork rod 41 and the second shift fork rod 51 can be positioned; the elastic member 6 includes a compression spring and a ball, and the compression spring presses the ball in the arc groove 55.

[0042] In other embodiments, the first-stage transmission mechanism 4 and the second speed transmission mechanism may also use synchronizers for shifting, and multiple synchronizers are slidably installed on the first transmission shaft 1 or the second transmission shaft 2, and the gears used for shifting are rotatably installed on the first transmission shaft 1 or the second transmission shaft 2. The synchronizer is pushed into the gear used for shifting by the shift fork rod, so that the gear rotates synchronously with the corresponding transmission shaft to achieve shifting.

[0043] See also Figure 5 As shown, the second purpose of this embodiment is to provide a four-wheeled riding micro-tillage machine 9, which adopts the rear gearbox described above and combines the gear positions of the front gearbox to meet the use requirements of various walking and tillage modes.

[0044] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A rear transmission, comprising a first transmission shaft, a second transmission shaft, and a first-stage transmission mechanism, wherein the first-stage transmission mechanism can switch between multiple first-stage gears to change the transmission ratio between the first transmission shaft and the second transmission shaft, characterized in that: It also includes a third transmission shaft and a two-stage speed change mechanism, wherein the two-stage speed change mechanism can switch between multiple two-stage gears to change the transmission ratio between the second transmission shaft and the third transmission shaft.

2. The rear gearbox according to claim 1, characterized in that: The first-stage speed change mechanism includes a first double gear that can slide axially along the first transmission shaft, and two first transmission gears are fixedly installed on the second transmission shaft. When adjusting the gear, the first double gear is slid, and the corresponding side of the first double gear can slide to engage with the corresponding first transmission gear.

3. The rear gearbox according to claim 1, characterized in that: The secondary speed change mechanism includes a second double gear that can slide axially along the second transmission shaft, and two second transmission gears are fixedly installed on the third transmission shaft. When adjusting the gear, the second double gear is slid so that the corresponding side of the second double gear slides to engage with the corresponding second transmission gear.

4. The rear gearbox according to claim 1, characterized in that: The first-stage speed change mechanism includes a first shift fork rod and a first rotating part, and the second-stage speed change mechanism includes a second shift fork rod and a second rotating part. The first shift fork rod and the second shift fork rod are both installed on the transmission housing for transverse sliding. A control handle is provided on the outside of the transmission housing. The control handle controls the first rotating part to rotate in the Z-axis direction, or controls the second rotating part to rotate in the Y-axis direction, so that the first rotating part pushes the first shift fork rod to slide, or the other end of the second rotating part pushes the second shift fork rod to slide.

5. The rear gearbox according to claim 4, characterized in that: The second shift fork lever is vertically provided with a second slot on the outer side of the gearbox housing, the second rotating portion includes a second rotating plate and a second extension rod, one end of the second extension rod extends below the seat and is connected to the control handle through a hinge portion, the other end of the second extension rod is fixedly connected to one end of the second rotating plate, and the other end of the second rotating plate extends into the second slot; When the control handle rotates around the Y-axis, the second rotating plate is controlled to push the second shift fork rod.

6. The rear gearbox according to claim 5, characterized in that: The first shift fork lever is provided with a first slot transversely on the outer side of the gearbox housing, the first rotating part comprises a V-shaped plate, a first extension rod and a center rod installed on the outer side of the gearbox housing, one end of the V-shaped plate extends into the slot, a first through hole is provided in the middle of the V-shaped plate, and is rotatably mounted on the center rod through the first through hole, a second through hole is provided at the other end of the V-shaped plate, both ends of the first extension rod are bent upward, one end of the first extension rod is rotatably connected to the second through hole, a plate body is welded on the control handle, a strip hole is vertically provided on the plate body, the other end of the first extension rod passes through the strip hole, the upper part of the control handle is fixedly connected with the plate body, which rests on the outer side of the hinge part and is located above the control handle; When the control handle rotates around the Z-axis, it drives the plate to move forward and backward along the Y-axis. When the control handle rotates around the Y-axis, the other end of the first extension rod can move in the strip-shaped hole.

7. The rear gearbox according to claim 4, characterized in that: The first shift fork rod and the second shift fork rod are both spaced apart and provided with a plurality of arc grooves in the rear gearbox housing, each arc groove corresponds to a first gear position or a second gear position, and two elastic members are fixedly connected to the inner wall of the rear gearbox housing, and the two elastic members are respectively tightened in the corresponding arc grooves.

8. A four-wheeled riding micro-tillage machine, characterized in that: A rear gearbox according to any one of claims 1 to 7 is used.

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