Reverse gear transmission structure of tractor

Abstract

The present invention provides a reverse transmission structure for a tractor, comprising a transmission case and a rear axle case, and a reverse driving gear shaft, a spacer, a first needle bearing, a reverse driven gear, a reverse engagement seat, a reverse engagement sleeve, a locking nut and a stop washer, a forward gear spline shaft, a second needle bearing, a thrust washer, a third needle bearing, a reverse shift head, a reverse shift shaft, a set bolt, a reverse intermediate shaft, a reverse intermediate gear, a pressure plate, an elastic pin, a safety start switch, a reverse shift fork shaft, a self-locking assembly, a reverse shift fork, and related connecting components, including an auxiliary transmission duplex gear, a creeper gear internal gear seat, a creeper gear engagement sleeve, a creeper gear fork, a bearing seat, a pinion gear shaft, a transfer case driving gear, and an auxiliary transmission output shaft. The present invention has a simple structure and a short axial dimension. Furthermore, when shifting in reverse, less power flows through the gear pair, thereby reducing power loss and improving transmission efficiency.

Description

Technical Field

[0001] The present invention relates to the field of tractors, and in particular to a reverse gear transmission structure of a tractor. Background Art

[0002] In traditional wheeled tractors, the power of the rear power output is the engine power, which is directly transmitted to the input shaft of the power output device through the secondary clutch. After a first-stage reduction, it is transmitted to the power output shaft to drive the agricultural machinery to operate. The reverse gear function of the tractor transmission system can be realized through different structural forms according to the structure and needs of the gearbox.

[0003] In the prior art, the reverse gear transmission structure of a tractor is complex in structure, has a long axial dimension, and when the reverse gear is realized, more power flows through the gear pair, resulting in low transmission efficiency. Summary of the Invention

[0004] The present invention aims to provide a tractor reverse gear transmission structure to overcome the above problems or at least partially solve the above problems.

[0005] To achieve the above object, the technical solution of the present invention is specifically implemented as follows:

[0006] The present invention provides a reverse gear transmission structure for a tractor, comprising a gearbox body and a rear axle case, as well as a reverse gear driving gear shaft, a spacer, a needle roller bearing 1, a reverse gear driven gear, a reverse gear engagement seat, a reverse gear engagement sleeve, a locking nut and a stop washer, a forward gear spline shaft, a needle roller bearing 2, a thrust washer, a needle roller bearing 3, a reverse gear shift head, a reverse gear shift shaft, a fixing bolt, a reverse gear intermediate shaft, a reverse gear intermediate gear, a pressure plate, an elastic pin, a safety start switch, a reverse gear shift fork shaft, a self-locking assembly, a reverse gear shift fork and related connecting parts, wherein the related connecting parts include a secondary speed double gear, a creeper gear inner gear seat, a creeper gear engagement sleeve, a creeper gear shift fork, a bearing seat, a small bevel gear shaft, a transfer case driving gear and a secondary speed output shaft, the inner hole of the reverse gear driven gear is coaxially sleeved on the outer circle of one end of the reverse gear engagement seat, and the reverse gear shift fork is a gear shift shaft. The transmission gear of said driving gear is connected with the transmission gear of said driving gear axle to the upper and lower ends of the transmission gear, and the transmission gear and the transmission gear are connected with each other through a hole in the front of the transmission gear and the lower end of the transmission gear are connected with the transmission gear of said driving gear axle to the upper and lower ends of the transmission gear.

[0007] As a further solution of the present invention, the small bevel gear shaft is coaxially sleeved in the inner hole of the bearing seat, and passes through the bearing, rear shaft sleeve, transfer case driving gear, front shaft sleeve, bearing, and reverse gear engagement seat from right to left in sequence, and the left end is locked with a locking nut and a stop washer. The inner hole of the reverse gear engagement seat is splined to the small bevel gear shaft, and the inner hole of the transfer case driving gear is splined to the small bevel gear shaft.

[0008] As a further solution of the present invention, the bearing seat is coaxially sleeved in the hole below the rear axle box, and the left end is fixed to the wall of the rear axle box by bolts.

[0009] As a further solution of the present invention, one end of the forward gear spline shaft is coaxially sleeved on one end of the small bevel gear shaft, and a second needle roller bearing is coaxially installed between the two. The other end of the forward gear spline shaft is coaxially sleeved with a thrust pad and a third needle roller bearing, and is coaxially installed in the inner hole of one end of the auxiliary speed change output shaft.

[0010] As a further solution of the present invention, the reverse gear intermediate shaft is coaxially sleeved in the hole of the rear axle case and is parallel to the hole below the rear axle case. The reverse gear intermediate gear inner hole is coaxially sleeved with two bearings, and a retaining ring is installed between the bearings to separate the holes. The reverse gear intermediate gear with the inner ring equipped with the bearing is coaxially sleeved at one end of the reverse gear intermediate shaft, and the other end of the reverse gear intermediate shaft is fixed to the rear axle case with a fixing bolt. A pressure plate is provided on one side of the reverse gear intermediate gear.

[0011] As a further solution of the present invention, the reverse gear shift shaft is coaxially sleeved in the hole of the rear axle case, crosses the rear axle case, and its axis is perpendicular to the axis of the hole below the rear axle case. One end of the reverse gear shift head is coaxially sleeved on the reverse gear shift shaft and fixed on the shaft by an elastic pin, and the other end is connected to one end of the reverse gear fork.

[0012] As a further solution of the present invention, the crawler gear fork is installed in the rear axle case, the crawler gear driven gear is loosely sleeved on the crawler gear inner gear seat, the outer ring of the crawler gear inner gear seat is connected to the crawler gear engagement sleeve, and the inner ring is connected to the small bevel gear shaft, and the inner ring of the crawler direct gear engagement gear seat is connected to the auxiliary speed double gear.

[0013] The present invention provides a reverse gear transmission structure for a tractor, which has the following beneficial effects:

[0014] 1. Simple structure and short axial dimension.

[0015] 2. When achieving reverse gear, less power flows through the gear pair, reducing power loss and improving transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is the reverse gear transmission structure of the present invention.

[0018] Figure 2 For the present invention Figure 1 AA cross-sectional view of the mid-reverse gear transmission structure.

[0019] Figure 3 For the present invention Figure 2 Cross-sectional view of the mid-reverse gear transmission structure CC.

[0020] Figure 4 For the present invention Figure 2 Cross-sectional view of the mid-reverse gear transmission structure BB.

[0021] Figure 5 This is the power flow path when the reverse gear is engaged in the present invention.

[0022] Figure 6 It is a reverse gear transmission structure in the prior art.

[0023] Figure 7 For existing technology Figure 6 AA cross-sectional view of the mid-reverse gear transmission structure.

[0024] Figure 8 This is the route through which power flows when the reverse gear is engaged in the prior art.

[0025] Figure: 1, reverse gear driving gear shaft; 2, spacer ring; 3, rear axle housing; 4, needle roller bearing 1; 5, reverse gear driven gear; 6, reverse gear engagement seat; 7, reverse gear engagement sleeve; 8, locking nut and stop washer; 9, forward gear spline shaft; 10, needle roller bearing 2; 11, thrust washer; 12, needle roller bearing 3; 13, reverse gear shifter; 14, reverse gear shift shaft; 15, set bolt; 16, reverse gear intermediate shaft; 17, reverse gear intermediate gear; 18, pressure Plate; 19. Elastic pin; 20. Safety start switch; 21. Reverse gear fork shaft; 22. Self-locking assembly; 23. Reverse gear fork; 25. Transmission body; 26. Auxiliary transmission double gear; 27. Creeper gear inner gear seat; 28. Creeper gear engagement sleeve; 29. Creeper gear fork; 30. Bearing seat; 31. Small bevel gear shaft; 32. Transfer case driving gear; 33. Auxiliary transmission output shaft; a is the auxiliary transmission section; b is the crawler gear section; c is the reverse gear section. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0027] Example 1: Refer to the attached Figure 1-5 A tractor reverse gear transmission structure, comprising a gearbox body 25 and a rear axle housing 3, and a reverse gear driving gear shaft 1 and a spacer ring installed inside the gearbox body 25 and the rear axle housing 3.

[0028] 2. Needle roller bearing 1, 4, reverse gear driven gear, 5, reverse gear engagement seat, 6, reverse gear engagement sleeve, 7, locking nut and stop washer, 8, forward gear spline shaft, 9, needle roller bearing 2, 10, thrust washer, 11, needle roller bearing 3, 12, reverse gear shift head, 13, reverse gear shift shaft, 14, set bolt, 15, reverse gear intermediate shaft, 16, reverse gear intermediate gear, 17, pressure plate, 18, elastic pin, 19, safety start switch, 20, reverse gear fork shaft, 21, self-locking assembly, 22, reverse gear fork, 23, and related connecting parts;

[0029] Related connecting parts include the auxiliary transmission double gear 26, the crawler gear internal gear seat 27, the crawler gear engagement sleeve 28, the crawler gear fork 29, the bearing seat 30, the small bevel gear shaft 31, the transfer case driving gear 32 and the auxiliary transmission output shaft 33.

[0030] The inner hole of the reverse gear driven gear 5 is coaxially sleeved on the outer circle of one end of the reverse gear engagement seat 6. A needle bearing 4 is coaxially sleeved between the inner hole of the reverse gear driven gear 5 and the outer circle of one end of the reverse gear engagement seat 6. The reverse gear engagement sleeve 7 is coaxially sleeved on the reverse gear engagement seat 6, and the two are spline connected.

[0031] The small bevel gear shaft 31 is coaxially sleeved in the inner hole of the bearing seat 30, and passes through the bearing, rear shaft sleeve, transfer case driving gear 32, front shaft sleeve, bearing, and reverse gear engagement seat 6 from right to left in sequence. The left end is locked with a locking nut and a stop washer 8. The inner hole of the reverse gear engagement seat 6 is spline-connected to the small bevel gear shaft 31, and the inner hole of the transfer case driving gear 32 is spline-connected to the small bevel gear shaft 31.

[0032] The bearing seat 30 is coaxially sleeved in the hole below the rear axle box 3, and the left end is fixed to the wall of the rear axle box 3 by bolts.

[0033] One end of the forward gear spline shaft 9 is coaxially sleeved on one end of the small bevel gear shaft 31, and a needle roller bearing 2 10 is coaxially installed between the two. The other end of the forward gear spline shaft 9 is coaxially sleeved with a thrust pad 11 and a needle roller bearing 3 12, and is coaxially installed in the inner hole of one end of the auxiliary speed change output shaft 33.

[0034] The reverse gear intermediate shaft 16 is coaxially sleeved in the hole of the rear axle case 3 and is parallel to the hole below the rear axle case 3. The inner hole of the reverse gear intermediate gear 17 is coaxially sleeved with two bearings. The bearings are installed with holes separated by retaining rings. The reverse gear intermediate gear 17 with the inner ring equipped with bearings is coaxially sleeved on one end of the reverse gear intermediate shaft 16. The other end of the intermediate shaft 16 is fixed to the rear axle case 3 with a fixing bolt 15. A pressure plate 18 is provided on one side of the intermediate gear 17.

[0035] The reverse gear shift fork shaft 21 is coaxially sleeved in the hole of the rear axle case 3 and is parallel to the hole below the rear axle case 3. One end of the reverse gear shift fork 23 is coaxially sleeved on the reverse gear shift fork shaft 21 and is fixed to one end of the reverse gear shift fork shaft 21 through an elastic pin. The other end of the reverse gear shift fork 23 is coaxially sleeved in the groove of the reverse gear engagement sleeve 7. An elastic pin 19 is installed at the other end of the reverse gear shift fork shaft 21 for limiting the position when engaging the forward gear. A self-locking component 22 and a safety start switch 20 are also installed between the reverse gear shift fork shaft 21 and the rear axle case 3.

[0036] The upper hole of the rear axle box 3 is parallel to the lower hole. The upper hole of the rear axle box 3 is coaxially installed with the bearing, spacer 2, and bearing from left to right. One end of the reverse gear driving gear shaft 1 is coaxially sleeved in the inner hole of the bearing, and the inner hole of the other end is spline-engaged with the auxiliary speed change double gear 26.

[0037] The reverse gear shift shaft 14 is coaxially sleeved in the hole of the rear axle case 3, crossing the rear axle case 3, and its axis is perpendicular to the axis of the hole below the rear axle case 3. One end of the reverse gear shift head 13 is coaxially sleeved on the reverse gear shift shaft 14 and fixed on the shaft by an elastic pin, and the other end is connected to one end of the reverse gear fork 23.

[0038] The crawler gear fork 29 is installed in the rear axle box 3, and the crawler gear driven gear is loosely sleeved on the crawler gear inner gear seat 27. The outer ring of the crawler gear inner gear seat 27 is connected to the crawler gear engagement sleeve 28, and the inner ring is connected to the small bevel gear shaft. The inner ring of the crawler direct gear engagement gear seat is connected to the auxiliary speed double gear 26.

[0039] Shifting principle:

[0040] When engaging reverse gear: the reverse gear fork 23 is moved backward to the set stroke by the reverse gear operation. At this time, the reverse gear engagement sleeve 7 is spline-engaged with the reverse gear driven gear 5 and the reverse gear engagement seat 6, and the reverse gear is engaged. At this time, the power flow path is as follows Figure 2-4 As shown: engine - shaft I - main transmission gear pair - shaft II - auxiliary transmission double gear - reverse gear driving gear shaft 1 - reverse gear intermediate gear 17 - reverse gear driven gear 5 - small bevel gear shaft.

[0041] When engaging a forward gear:

[0042] When the crawler gear shift fork moves forward by a set stroke, the crawler gear engagement sleeve is simultaneously spline-engaged with the forward gear spline shaft 9 and the auxiliary transmission output shaft, and the direct gear is engaged. At this time, the reverse gear shift fork 23 is moved forward by a set stroke by reverse gear operation, and the reverse gear engagement sleeve 7 is simultaneously spline-engaged with the forward gear spline shaft 9 and the reverse gear engagement seat 6, and the forward gear is engaged.

[0043] Comparative Example 1: Figure 6-8 It mainly consists of a set screw and nut 1', a bearing bushing 2', a reverse gear duplex gear 3', a spacer 4', a retaining ring 5', a rear axle case 6', a needle roller bearing 1 7', a reverse gear driven gear 8', a reverse gear engagement gear seat 9', a reverse gear engagement sleeve 10', a lock nut and a stop washer 11', a forward gear shaft 12', a creeper gear engagement sleeve 13', a needle roller bearing 2 14', a shift head 15', a shift shaft 16', a set bolt 17', a reverse gear shaft 18', a reverse gear intermediate gear 19', a reverse gear fork shaft 20', a self-locking assembly 21', a reverse gear fork 22', and bearings.

[0044] When the reverse gear is engaged, the structure realizes the reverse gear transmission route as follows Figure 8 Shown: engine - shaft I - main transmission gear pair - shaft II - auxiliary transmission duplex gear - low gear driven gear - auxiliary transmission output shaft - forward gear shaft 12' - reverse duplex gear 3' - reverse intermediate gear 19' - reverse driven gear 8' - small bevel gear shaft.

[0045] Conclusion: Example 1 is the improved technical solution of the present invention, and Comparative Example 1 is the existing technology. Through comparison, it is found that the reverse gear transmission structure of the tractor in Comparative Example 1 is complex in structure, has a long axial dimension, more power flows through the gear pair when achieving reverse gear, and the transmission efficiency is low, while Example 1 has a simple structure, a short axial dimension, and less power flows through the gear pair when achieving reverse gear, which reduces power loss and improves transmission efficiency.

[0046] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A tractor reverse gear transmission structure, characterized in that: The invention comprises a transmission case (25) and a rear axle case (3), and a reverse gear driving gear shaft (1), a spacer (2), a needle roller bearing 1 (4), a reverse gear driven gear (5), a reverse gear engagement seat (6), a reverse gear engagement sleeve (7), a locking nut and a stop washer (8), a forward gear spline shaft (9), a needle roller bearing 2 (10), a thrust washer (11), a needle roller bearing 3 (12), a reverse gear shift head (13), a reverse gear shift shaft (14), a fixing bolt (15), a reverse gear intermediate shaft (16), a reverse gear shift shaft (17), and a reverse gear shift shaft (18). The intermediate gear (17), the pressure plate (18), the elastic pin (19), the safety start switch (20), the reverse gear fork shaft (21), the self-locking assembly (22), the reverse gear fork (23) and related connecting parts, the related connecting parts include the auxiliary speed change double gear (26), the crawler gear inner gear seat (27), the crawler gear engagement sleeve (28), the crawler gear fork (29), the bearing seat (30), the small bevel gear shaft (31), the transfer case driving gear (32) and the auxiliary speed change output shaft (33), the reverse gear driven gear (5) is coaxially sleeved on the inner hole of the reverse gear The outer circle of one end of the engagement seat (6), the inner hole of the reverse gear driven gear (5) and the outer circle of one end of the reverse gear engagement seat (6) are coaxially sleeved with a needle bearing (4), the reverse gear engagement sleeve (7) is coaxially sleeved on the reverse gear engagement seat (6), and the two are spline-connected, the reverse gear shift fork shaft (21) is coaxially sleeved in the hole of the rear axle box (3) and is parallel to the lower hole of the rear axle box (3), one end of the reverse gear shift fork (23) is coaxially sleeved on the reverse gear shift fork shaft (21) and fixed to one end of the reverse gear shift fork shaft (21) by an elastic pin, and the other end of the reverse gear shift fork (23) is coaxially sleeved. The reverse gear fork shaft (21) is provided in the groove of the reverse gear engagement sleeve (7). The other end of the reverse gear fork shaft (21) is provided with an elastic pin (19) for limiting the position when engaging the forward gear. A self-locking component (22) and a safety start switch (20) are also provided between the reverse gear fork shaft (21) and the rear axle housing (3). The upper hole of the rear axle housing (3) is parallel to the lower hole. The upper hole of the rear axle housing (3) is coaxially provided with a bearing, a spacer (2), and a bearing from left to right. One end of the reverse gear driving gear shaft (1) is coaxially sleeved in the inner hole of the bearing, and the inner hole of the other end is spline-engaged with the auxiliary speed change double gear (26).

2. A tractor reverse gear transmission structure according to claim 1, characterized in that: The pinion gear shaft (31) is coaxially sleeved in the inner hole of the bearing seat (30), and passes through the bearing, rear shaft sleeve, transfer case driving gear (32), front shaft sleeve, bearing, and reverse gear engagement seat (6) in sequence from right to left. The left end is locked with a locking nut and a stop washer (8). The inner hole of the reverse gear engagement seat (6) is spline-connected to the pinion gear shaft (31), and the inner hole of the transfer case driving gear (32) is spline-connected to the pinion gear shaft (31).

3. The reverse gear transmission structure of a tractor according to claim 1, characterized in that: The bearing seat (30) is coaxially sleeved in the lower hole of the rear axle box (3), and the left end is fixed to the wall of the rear axle box (3) by bolts.

4. The reverse gear transmission structure of a tractor according to claim 1, characterized in that: One end of the forward gear spline shaft (9) is coaxially sleeved on one end of the small bevel gear shaft (31), and a second needle roller bearing (10) is coaxially installed between the two. The other end of the forward gear spline shaft (9) is coaxially sleeved with a thrust washer (11) and a third needle roller bearing (12), and is coaxially installed in the inner hole of one end of the auxiliary speed change output shaft (33).

5. The reverse gear transmission structure of a tractor according to claim 1, characterized in that: The reverse gear intermediate shaft (16) is coaxially sleeved in the hole of the rear axle case (3) and is parallel to the hole below the rear axle case (3). The reverse gear intermediate gear (17) is coaxially sleeved with two bearings in the inner hole. A retaining ring is installed between the bearings to separate the holes. The reverse gear intermediate gear (17) with the inner ring of the bearing is coaxially sleeved on one end of the reverse gear intermediate shaft (16). The other end of the reverse gear intermediate shaft (16) is fixed to the rear axle case (3) with a fixing bolt (15). A pressure plate (18) is provided on one side of the reverse gear intermediate gear (17).

6. The reverse gear transmission structure of a tractor according to claim 1, characterized in that: The reverse gear shift shaft (14) is coaxially sleeved in the hole of the rear axle case (3), crosses the rear axle case (3), and its axis is perpendicular to the axis of the hole below the rear axle case (3). One end of the reverse gear shift head (13) is coaxially sleeved on the reverse gear shift shaft (14) and fixed on the shaft through an elastic pin, and the other end is connected to one end of the reverse gear shift fork (23).

7. The reverse gear transmission structure of a tractor according to claim 1, characterized in that: The crawler gear shift fork (29) is installed in the rear axle box (3), the crawler gear driven gear is loosely sleeved on the crawler gear inner gear seat (27), the outer ring of the crawler gear inner gear seat (27) is connected to the crawler gear engagement sleeve (28), the inner ring is connected to the small bevel gear shaft, and the inner ring of the crawler direct gear engagement gear seat is connected to the auxiliary speed change double gear (26).

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