Three-speed power output structure and agricultural equipment

Abstract

The application provides a three-speed power output structure and agricultural equipment, and relates to the technical field of agricultural machinery equipment. The three-speed power output structure comprises a power input shaft, a power output shaft, a shift fork assembly and a gear shifting engagement sleeve. The power input shaft is provided with a high-gear driving gear, a middle-gear driving gear and a low-gear driving gear which rotate synchronously. The power output shaft is sleeved with a high-gear driven gear, a middle-gear driven gear and a low-gear driven gear. The gear shifting engagement sleeve is slidably arranged on the power output shaft and synchronously rotates with the power output shaft. The outer wall of the gear shifting engagement sleeve is provided with a first middle-gear gear ring for engaging and transmitting power with the middle-gear driven gear. The inner wall of the gear shifting engagement sleeve is provided with a first high-gear gear ring for engaging and transmitting power with the high-gear driven gear and a first low-gear gear ring for engaging and transmitting power with the low-gear driven gear. The shift fork assembly is connected with the gear shifting engagement sleeve. The technical effect of simplifying the operating mechanism is achieved.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery and equipment technology, and more specifically, to a three-speed power output structure and agricultural machinery and equipment. Background Technology

[0002] The tractor power take-off (PTO) is a core component of agricultural machinery transmission, responsible for transmitting engine power to implements such as rotary tillers, seeders, and harvesters. Traditional PTOs typically consist of two speed settings, providing standard output speeds of 540 rpm and 1000 rpm. However, when operating conditions change and require a speed of 760 rpm, the PTO cannot meet the needs, thus limiting its applicability.

[0003] Current three-speed PTO technology typically employs a structure of three sets of fixed meshing gears and two sets of meshing sleeves. While this improves the speed range, it also results in a large PTO assembly, increased weight, and a lengthy internal transmission chain, which affects power transmission efficiency.

[0004] Meanwhile, multi-gear shifting relies on complex mechanical linkage mechanisms, bulky operating mechanisms, and unintuitive feedback, which can easily lead to risks such as shifting delays and incomplete engagement, seriously affecting operational safety and efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a three-speed power output structure and agricultural machinery equipment to alleviate the technical problems of complex operating mechanisms in the prior art.

[0006] In a first aspect, embodiments of the present invention provide a three-speed power output structure, including a power input shaft, a power output shaft, a shift fork assembly, and a shift engagement sleeve; The power input shaft is equipped with a high-gear drive gear, a medium-gear drive gear, and a low-gear drive gear that rotate synchronously. The power output shaft is loosely fitted with a high-gear driven gear, a medium-gear driven gear, and a low-gear driven gear. The high-gear driving gear meshes with the high-gear driven gear, the medium-gear driving gear meshes with the medium-gear driven gear, and the low-gear driving gear meshes with the low-gear driven gear. The shift sleeve is slidably sleeved on the power output shaft, and the shift sleeve meshes with the power output shaft and rotates synchronously. The outer wall of the shift engagement sleeve is provided with a first intermediate gear ring for meshing and driving with the intermediate gear driven gear, and the inner wall of the shift engagement sleeve is provided with a first high gear ring for meshing and driving with the high gear driven gear and a first low gear ring for meshing and driving with the low gear driven gear. The shift fork assembly is connected to the shift engagement sleeve.

[0007] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein a first bushing is sleeved on the power output shaft, and the high-gear driven gear is slidably sleeved on the first bushing; One end of the high-gear driven gear is provided with a second high-gear ring gear for meshing and transmission with the first high-gear ring gear.

[0008] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the high-gear driven gear is provided with a receiving seat, and the second high-gear ring is located on the receiving seat; The intermediate driven gear is slidably mounted on the receiving seat, and the inner wall of the intermediate driven gear is provided with a second intermediate gear ring for meshing and transmission with the first intermediate gear ring.

[0009] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein a support seat is provided on the aforementioned high-gear driven gear, and a bearing is provided between the support seat and the power output shaft.

[0010] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein a second bushing is sleeved on the power output shaft, and the low-gear driven gear slides on the second bushing; The low-gear driven gear is provided with a second low-gear ring gear for meshing and transmission with the first low-gear ring gear.

[0011] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein a shift engagement gear seat is sleeved on the power output shaft, the shift engagement sleeve is sleeved on the shift engagement gear seat, and the shift engagement gear seat, the shift engagement sleeve and the power output shaft rotate synchronously.

[0012] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the outer wall of the aforementioned shift engagement gear seat is provided with a transmission gear ring for engaging and transmitting power with the first intermediate gear ring and the first low gear ring.

[0013] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the above-mentioned shift fork assembly includes a shift fork shaft, a shift fork, a spring locking member, a locking ball, and a shift transmission rod; The actuating transmission rod is disposed at one end of the shift fork shaft, and the shift fork is disposed at the other end of the shift fork shaft; The shift fork shaft is provided with multiple shift grooves, and the locking ball is disposed between the spring locking member and the shift grooves. The locking ball is pressed into the shift grooves by the spring locking member. The locking ball can switch between multiple shift slots as the shift fork shaft moves.

[0014] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the outer wall of the shift engagement sleeve is provided with a shift fork groove for fitting with the shift fork.

[0015] Secondly, embodiments of the present invention provide an agricultural machinery device, including the aforementioned three-speed power output structure.

[0016] Beneficial effects: This invention provides a three-speed power output structure, including a power input shaft, a power output shaft, a shift fork assembly, and a shift engagement sleeve. The power input shaft is equipped with a synchronously rotating high-gear drive gear, a medium-gear drive gear, and a low-gear drive gear. The power output shaft is loosely fitted with a high-gear driven gear, a medium-gear driven gear, and a low-gear driven gear; the high-gear drive gear meshes with the high-gear driven gear, the medium-gear drive gear meshes with the medium-gear driven gear, and the low-gear drive gear meshes with the low-gear driven gear. The shift engagement sleeve is slidably fitted onto the power output shaft and rotates synchronously with it. The outer wall of the shift engagement sleeve is provided with a first medium-gear gear ring for meshing with the medium-gear driven gear, and the inner wall of the shift engagement sleeve is provided with a first high-gear gear ring for meshing with the high-gear driven gear and a first low-gear gear ring for meshing with the low-gear driven gear. The shift fork assembly is connected to the shift engagement sleeve.

[0017] Specifically, during use, the position of the shift fork assembly on the power output shaft can be adjusted so that one of the high-gear driven gear, medium-gear driven gear, and low-gear driven gear on the power output shaft engages with the shift sleeve, thereby connecting one of these gears to the power output shaft. This allows one of the corresponding high-gear drive gear, medium-gear drive gear, and low-gear drive gear on the power input shaft to transmit power to the power output shaft. The structure is simple and the shifting is fast.

[0018] This invention provides an agricultural machinery device, including a three-speed power output structure. Compared with existing technologies, this agricultural machinery device has the advantages of the aforementioned three-speed power output structure, which will not be elaborated further here. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a three-speed power output structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the three-speed power output structure provided in an embodiment of the present invention; Figure 3 This is a partial sectional view of the components on the power output shaft in the three-speed power output structure provided in an embodiment of the present invention; Figure 4 A half-sectional schematic diagram of the power output shaft in the three-speed power output structure provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the shift fork assembly in the three-speed power output structure provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the shift engagement sleeve in the three-speed power output structure provided in an embodiment of the present invention.

[0021] icon: 10-Shell; 100 - Power input shaft; 110 - High-gear drive gear; 120 - Medium-gear drive gear; 130 - Low-gear drive gear; 200 - Power take-off shaft; 201 - First bushing; 202 - Second bushing; 210 - High-gear driven gear; 211 - Second high-gear ring gear; 212 - Receiver; 213 - Support seat; 214 - Bearing; 220 - Intermediate-gear driven gear; 221 - Second intermediate-gear ring gear; 230 - Low-gear driven gear; 231 - Second low-gear ring gear; 240 - Shift gear seat; 241 - Transmission ring gear; 300 - Shift fork assembly; 310 - Shift fork shaft; 311 - Shift groove; 320 - Shift fork; 330 - Spring locking element; 340 - Locking ball; 350 - Shift transmission rod; 400 - Shift engagement sleeve; 410 - First intermediate gear gear ring; 420 - First high gear gear ring; 430 - First low gear gear ring; 440 - Shift fork groove. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0027] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, this embodiment provides a three-speed power output structure, including a power input shaft 100, a power output shaft 200, a shift fork assembly 300, and a shift engagement sleeve 400. The power input shaft 100 is equipped with a synchronously rotating high-gear drive gear 110, a medium-gear drive gear 120, and a low-gear drive gear 130. The power output shaft 200 is loosely fitted with a high-gear driven gear 210, a medium-gear driven gear 220, and a low-gear driven gear 230. The high-gear drive gear 110 meshes with the high-gear driven gear 210, the medium-gear drive gear 120 meshes with the medium-gear driven gear 220, and the low-gear drive gear 230 meshes with the high-gear driven gear 210. The drive gear 130 meshes with the low-gear driven gear 230; the shift engagement sleeve 400 is slidably sleeved on the power output shaft 200, and the shift engagement sleeve 400 meshes with the power output shaft 200 and rotates synchronously; the outer wall of the shift engagement sleeve 400 is provided with a first intermediate gear ring 410 for meshing and driving with the intermediate gear driven gear 220, and the inner wall of the shift engagement sleeve 400 is provided with a first high gear ring 420 for meshing and driving with the high gear driven gear 210 and a first low gear ring 430 for meshing and driving with the low-gear driven gear 230; the shift fork assembly 300 is connected to the shift engagement sleeve 400.

[0028] Specifically, during use, the position of the shifting sleeve 400 on the power output shaft 200 can be adjusted by controlling the shift fork assembly 300, so that one of the three driven gears 210, 220 and 230 on the power output shaft 200 engages with the shifting sleeve 400, thereby enabling one of the three driven gears 210, 220 and 230 to drive through the power output shaft 200. This allows one of the three driven gears 210, 220 and 230 on the power input shaft 100 to transmit power to the power output shaft 200. The structure is simple and the shifting is fast.

[0029] At any given time, the high-gear drive gear 110, the medium-gear drive gear 120, and the low-gear drive gear 130 on the power input shaft 100 are always engaged with the corresponding high-gear driven gear 210, the medium-gear driven gear 220, and the low-gear driven gear 230 on the power output shaft 200. When the high-gear driven gear 210, the medium-gear driven gear 220, and the low-gear driven gear 230 on the power output shaft 200 are not engaged with the shift engagement sleeve 400, the high-gear driven gear 210, the medium-gear driven gear 220, and the low-gear driven gear 230 cannot drive the power output shaft 200 to rotate.

[0030] Furthermore, the shift sleeve 400 can mesh with one of the three driven gears: the high-gear driven gear 210, the intermediate-gear driven gear 220, and the low-gear driven gear 230. When the shift fork assembly 300 is operating, the meshing relationship between the shift sleeve 400 and the three driven gears 210, 220, and 230 can be changed. For example, the meshing of the shift sleeve 400 with the high-gear driven gear 210 can be changed to the meshing of the shift sleeve 400 with the intermediate-gear driven gear 220, or the meshing of the shift sleeve 400 with the low-gear driven gear 230 can be changed.

[0031] The power output shaft 200 is fitted with a shift gear seat 240, and a shift sleeve 400 is fitted on the shift gear seat 240. The shift gear seat 240, the shift sleeve 400, and the power output shaft 200 rotate synchronously. The outer wall of the shift gear seat 240 is provided with a transmission gear ring 241 for meshing with the first intermediate gear ring 410 and the first low gear ring 430. The shift gear seat 240 meshes with the power output shaft 200, and the shift sleeve 400 always slides on the shift gear seat 240, driving the shift gear seat 240 to rotate.

[0032] It should be noted that the first intermediate gear ring 410 is located on the outer wall of the shift engagement sleeve 400, while the first high gear ring 420 and the first low gear ring 430 are located on the inner wall of the shift engagement sleeve 400, and there is a certain distance between the first high gear ring 420 and the first low gear ring 430. When the first intermediate gear ring 410 meshes with the intermediate driven gear 220, the first high gear ring 420 and the first low gear ring 430 mesh with the transmission ring 241 on the shift engagement gear seat 240, and the power transmission path is: power input shaft 100 - intermediate driving gear 120 - intermediate driven gear 220 - shift engagement sleeve 400 - shift engagement gear seat 240 - power output shaft 200.

[0033] In addition, the input shaft, power output shaft 200, shift fork assembly 300 and shift engagement sleeve 400 are all housed inside the housing 10.

[0034] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, in the optional embodiment, a first bushing 201 is sleeved on the power output shaft 200, and a high-gear driven gear 210 is slidably sleeved on the first bushing 201; one end of the high-gear driven gear 210 is provided with a second high-gear gear ring 211 for meshing and transmission with the first high-gear gear ring 420.

[0035] The high-gear driven gear 210 is provided with a support seat 212, and the second high-gear gear ring 211 is located on the support seat 212; the medium-gear driven gear 220 is slidably sleeved on the support seat 212, and the inner wall of the medium-gear driven gear 220 is provided with a second medium-gear gear ring 221 for meshing and transmission with the first medium-gear gear ring 410.

[0036] The high-gear driven gear 210 is provided with a support seat 213, and a bearing 214 is provided between the support seat 213 and the power output shaft 200. The bearing 214 and the high-gear first bushing 201 jointly support the high-gear driven gear 210, so that the high-gear driven gear 210 can rotate freely.

[0037] The power output shaft 200 is fitted with a second bushing 202, and the low-gear driven gear 230 is slidably sleeved on the second bushing 202; the low-gear driven gear 230 is provided with a second low-gear gear ring 231 for meshing and transmission with the first low-gear gear ring 430.

[0038] Specifically, the intermediate driven gear 220 slides on the high driven gear 210. The intermediate driven gear 220, high driven gear 210, and low driven gear 230 are located on both sides of the shift engagement sleeve 400, and the second high gear gear ring 211, the second intermediate gear gear ring 221, and the second low gear gear ring 231 are located on both sides of the shift engagement sleeve 400, with the second intermediate gear gear ring 221 positioned between the second high gear gear ring 211 and the second low gear gear ring 231. When the first intermediate gear gear ring 410 meshes with the second intermediate gear gear ring 221, both the second high gear gear ring 211 and the second low gear gear ring 231 engage with the shift engagement sleeve 400. The transmission gear ring 241 on the shift gear seat 240 is engaged; when the first high gear gear ring 420 and the second high gear gear ring 211 are engaged, the second low gear gear ring 231 is engaged with the transmission gear ring 241 on the shift gear seat 240, and the first intermediate gear gear ring 410 and the second intermediate gear gear ring 221 are located on both sides of the second high gear gear ring 211 respectively; when the first low gear gear ring 430 and the second low gear gear ring 231 are engaged, the second high gear gear ring 211 is engaged with the transmission gear ring 241 on the shift gear seat 240, and the first intermediate gear gear ring 410 is located between the second intermediate gear gear ring 221 and the second low gear gear ring 231.

[0039] It should also be noted that when the first high gear ring 420, the first medium gear ring 410 and the first low gear ring 430 on the shift engagement sleeve 400 are not engaged in the transmission, the power output is interrupted and the gear is in neutral.

[0040] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, in an optional embodiment, the shift fork assembly 300 includes a shift fork shaft 310, a shift fork 320, a spring locking member 330, a locking ball 340, and a shift transmission rod 350. The shift transmission rod 350 is disposed at one end of the shift fork shaft 310, and the shift fork 320 is disposed at the other end of the shift fork shaft 310. The shift fork shaft 310 has multiple shift grooves 311, and the locking ball 340 is disposed between the spring locking member 330 and the shift grooves 311. The locking ball 340 is pressed into the shift grooves 311 by the spring locking member 330. When the shift fork shaft 310 moves, the locking ball 340 can switch between the multiple shift grooves 311.

[0041] The outer wall of the shift engagement sleeve 400 is provided with a shift fork groove 440 for matching the shift fork 320.

[0042] Specifically, the shift transmission rod 350 is driven by an external drive component. The shift transmission rod 350 can drive the shift fork shaft 310 to move, and the shift fork shaft 310 can drive the shift fork 320 to move. This causes the shift fork 320 to drive the shift engagement sleeve 400 to move through the shift fork groove 440. The movement of the shift engagement sleeve 400 enables one of the three gears—the first intermediate gear ring 410, the first high gear ring 420, and the first low gear ring 430—to engage in transmission, thereby achieving gear adjustment.

[0043] In addition, the spring locking member 330 and the locking ball 340 are disposed inside the housing 10. When the shift fork shaft 310 moves, the shift groove 311 on the shift fork shaft 310 can move relative to the shift fork shaft 310. The locking ball 340 will move upward to disengage from the shift groove 311 in the current position. Then, when the shift fork shaft 310 drives the shift fork 320 to complete a new power transmission connection, another shift groove 311 on the shift fork shaft 310 will move to below the locking ball 340. Under the pressure of the spring locking member 330, the locking ball 340 enters the new shift groove 311, thereby locking the shift fork shaft 310 and preventing the shift fork shaft 310 from moving arbitrarily due to vibration or other uncontrolled factors.

[0044] This embodiment provides an agricultural machinery device, including a three-speed power output structure.

[0045] Specifically, the agricultural machinery provided in this embodiment has the advantages of the above-mentioned three-speed power output structure compared with the prior art, which will not be elaborated here.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-speed power output structure, characterized in that, include: Power input shaft (100), power output shaft (200), shift fork assembly (300) and shift engagement sleeve (400); The power input shaft (100) is provided with a high-gear drive gear (110), a medium-gear drive gear (120) and a low-gear drive gear (130) that rotate synchronously. The power output shaft (200) is loosely fitted with a high-gear driven gear (210), a medium-gear driven gear (220), and a low-gear driven gear (230). The high-gear driving gear (110) meshes with the high-gear driven gear (210), the medium-gear driving gear (120) meshes with the medium-gear driven gear (220), and the low-gear driving gear (130) meshes with the low-gear driven gear (230). The shift engagement sleeve (400) is slidably sleeved on the power output shaft (200), and the shift engagement sleeve (400) meshes with the power output shaft (200) and rotates synchronously; The outer wall of the shift engagement sleeve (400) is provided with a first intermediate gear ring (410) for meshing and driving with the intermediate gear driven gear (220), and the inner wall of the shift engagement sleeve (400) is provided with a first high gear ring (420) for meshing and driving with the high gear driven gear (210) and a first low gear ring (430) for meshing and driving with the low gear driven gear (230). The shift fork assembly (300) is connected to the shift engagement sleeve (400).

2. The three-speed power output structure according to claim 1, characterized in that, A first bushing (201) is fitted on the power output shaft (200), and the high-gear driven gear (210) slides on the first bushing (201); One end of the high-gear driven gear (210) is provided with a second high-gear ring (211) for meshing and transmission with the first high-gear ring (420).

3. The three-speed power output structure according to claim 2, characterized in that, The high-gear driven gear (210) is provided with a support seat (212), and the second high-gear ring (211) is located on the support seat (212); The intermediate driven gear (220) is slidably sleeved on the receiving seat (212), and the inner wall of the intermediate driven gear (220) is provided with a second intermediate gear ring (221) for meshing and transmission with the first intermediate gear ring (410).

4. The three-speed power output structure according to claim 3, characterized in that, The high-gear passive gear (210) is provided with a support seat (213), and a bearing (214) is provided between the support seat (213) and the power output shaft (200).

5. The three-speed power output structure according to claim 1, characterized in that, A second bushing (202) is fitted on the power output shaft (200), and the low-gear driven gear (230) slides on the second bushing (202); The low-gear driven gear (230) is provided with a second low-gear ring (231) for meshing and transmission with the first low-gear ring (430).

6. The three-speed power output structure according to claim 1, characterized in that, The power output shaft (200) is fitted with a shift engagement gear seat (240), and the shift engagement sleeve (400) is fitted on the shift engagement gear seat (240). The shift engagement gear seat (240), the shift engagement sleeve (400) and the power output shaft (200) rotate synchronously.

7. The three-speed power output structure according to claim 6, characterized in that, The outer wall of the shift engagement gear seat (240) is provided with a transmission gear ring (241) for engaging with the first intermediate gear ring (410) and the first low gear ring (430).

8. The three-speed power output structure according to claim 1, characterized in that, The shift fork assembly (300) includes a shift fork shaft (310), a shift fork (320), a spring locking member (330), a locking ball (340), and a shift transmission rod (350). The actuating transmission rod (350) is disposed at one end of the shift fork shaft (310), and the shift fork (320) is disposed at the other end of the shift fork shaft (310); The shift fork shaft (310) is provided with a plurality of shift grooves (311), and the locking ball (340) is disposed between the spring locking member (330) and the shift grooves (311). The locking ball (340) is pressed into the shift grooves (311) by the spring locking member (330). The locking ball (340) can switch between the plurality of shift slots (311) as the shift fork shaft (310) moves.

9. The three-speed power output structure according to claim 8, characterized in that, The outer wall of the shift engagement sleeve (400) is provided with a shift fork groove (440) for fitting the shift fork (320).

10. An agricultural machinery device, characterized in that, Includes the three-speed power output structure as described in any one of claims 1-9.

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