Tractor creeper gear transmission structure

Abstract

The utility model provides a tractor creeper gear transmission structure which comprises a creeper gear duplicate gear, a creeper gear meshing sleeve, a creeper gear driven gear, a meshing tooth holder, a direct gear tooth holder and an auxiliary speed change output shaft. The inner ring of the first rolling bearing is coaxially installed on the outer circle of one end of the upper end cover, the upper end cover is fixed to one end of an upper square hole of the gearbox body through a bolt, and the outer ring of the second rolling bearing is coaxially installed in an inner hole of the rear axle box body. One end of the auxiliary speed change output shaft is externally meshed with a gear at one end of the creeper gear duplicate gear, a direct gear holder is coaxially installed at the end of the auxiliary speed change output shaft, and the outer circle of the auxiliary speed change output shaft is internally meshed with an inner hole of the direct gear holder through a gear. Two-stage speed reduction is adopted, the large transmission ratio can be achieved, wider working states can be met, assembly is easy, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor creeper gears, in particular to a creeper gear transmission structure of a tractor. Background Art

[0002] Figure 2 The present invention relates to an existing tractor creeper gear transmission structure, which mainly comprises a gearbox body (1'), a planetary carrier assembly (2'), a creeper gear shift fork (3'), a creeper gear engagement sleeve (4'), a gear shaft (5'), a rear axle housing (6'), a stop washer (7'), a needle roller bearing (8'), and an auxiliary speed change output shaft (10'). The creeper gear transmission structure has the following disadvantages: the planetary gear structure is limited by space, and the transmission ratio adjustment range is limited, with a transmission ratio of i≤6, which cannot meet the requirements of micro-climbing working conditions. In addition, the planetary assembly contains many gears and needle roller bearings, which makes assembly difficult and expensive. Utility Model Content

[0003] The utility model aims to provide a creeper gear transmission structure for a tractor to overcome the above problems or at least partially solve the above problems.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is specifically implemented as follows:

[0005] The utility model provides a creeper gear transmission structure for a tractor, comprising a creeper gear double gear, a creeper gear engagement sleeve, a creeper gear driven gear, an engagement gear seat, a direct gear gear seat and an auxiliary speed change output shaft, wherein a rolling bearing 1 is coaxially mounted on the inner hole of one end of the creeper gear double gear, and the other end coaxially passes through a shuttle gear double gear assembly and a rolling bearing 2, the inner ring of the rolling bearing 1 is coaxially mounted on the outer circle of one end of an upper end cover, the upper end cover is fixed to one end of the upper hole of the transmission case by bolts, and the outer ring of the rolling bearing 2 is coaxially mounted on the inner hole of the rear axle case.

[0006] One end of the auxiliary speed change output shaft is externally meshed with one end gear of the crawler gear double gear, and a direct gear seat is coaxially mounted on this end of the auxiliary speed change output shaft, and the outer circle of the auxiliary speed change output shaft and the inner hole of the direct gear seat are internally meshed with gears.

[0007] The gear unit is connected to the transmission gear of the transmission gear by a toothed connecting rod and a toothed connecting rod, and the toothed connecting rod is connected to the transmission gear of the transmission gear by a toothed connecting rod.

[0008] As a further solution of the utility model, it also includes a crawler gear fork, one end of which is coaxially installed in the outer annular groove of the crawler gear engagement sleeve, and the other end is coaxially fixed to the crawler gear fork shaft.

[0009] As a further solution of the present invention, it also includes a hole retaining ring, which is arranged between the auxiliary speed change output shaft and the direct gear seat to prevent the direct gear seat from moving leftward.

[0010] As a further solution of the present invention, the right end of the crawler gear engagement sleeve is provided with an external spline, and the left end of the crawler gear driven gear is provided with an internal spline, and the internal spline matches the external spline.

[0011] As a further solution of the present invention, the creeper gear engagement sleeve is provided with an internal spline, the left outer circle of the direct gear seat is provided with an external spline, and the internal spline matches the external spline.

[0012] As a further solution of the present invention, it also includes a shuttle gear shift fork, and one end of the shuttle gear shift fork is coaxially sleeved on the outer annular groove of the shuttle gear engaging sleeve, the shuttle gear engaging sleeve is sleeved on the shuttle gear engaging tooth seat and connected through a spline, an internal spline is provided on the right side of the engaging tooth seat, and the internal spline matches the external spline on the left side of the shuttle gear engaging sleeve.

[0013] The utility model provides a creeper gear transmission structure for a tractor, which has the beneficial effects of achieving a larger transmission ratio by adopting two-stage reduction, achieving a transmission ratio i≥10, meeting a wider range of working conditions, being simple to assemble, and having a low cost, and being able to achieve a lower speed to meet the creeper gear control requirements of micro-climbing conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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.

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Figure 2 The utility model relates to a creeper gear transmission structure of an existing tractor.

[0017] In the figure: 1. gearbox body; 2. upper end cover; 3. rolling bearing 1; 4. creeper gear duplex gear; 5. creeper gear shift fork; 6. creeper gear engagement sleeve; 7. creeper gear driven gear; 8. rolling bearing 2; 9. rear axle box; 10. engagement gear seat; 11. needle roller bearing 1; 12. bearing retaining ring; 13. retaining ring; 14. retaining ring for hole; 15. needle roller bearing 2; 16. direct gear seat; 17. auxiliary speed change output shaft; 18. shuttle gear duplex gear assembly; 19. shuttle gear engagement gear seat; 20. needle roller bearing 3. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1 The present invention provides a tractor creeper gear transmission structure, comprising a creeper gear duplex gear 4, a creeper gear engagement sleeve 6, a creeper gear driven gear 7, an engagement gear holder 10, a direct gear holder 16, and an auxiliary transmission output shaft 17. A rolling bearing 1 3 is coaxially mounted on the inner hole of one end of the creeper gear duplex gear 4, and the other end coaxially passes through a shuttle gear duplex gear assembly 18 and a rolling bearing 2 8. The inner ring of the rolling bearing 1 3 is coaxially mounted on the outer circle of one end of the upper end cover 2. The upper end cover 2 is fixed to one end of the upper hole of the transmission case 1 by bolts. The outer ring of the rolling bearing 2 8 is coaxially mounted on the inner hole of the rear axle case 9.

[0020] One end of the auxiliary transmission output shaft 17 is externally meshed with one end of the crawler gear double gear 4, and the direct gear seat 16 is coaxially mounted on this end of the auxiliary transmission output shaft 17. The outer circle of the auxiliary transmission output shaft 17 and the inner hole of the direct gear seat 16 are internally meshed with gears.

[0021] A coaxial sleeve is provided at one end of the meshing gear seat 10 with a crawling gear driven gear 7 and a bearing retaining ring 1312, and is limited by a retaining ring 13. A needle bearing 11 is installed between the outer circle of the meshing gear seat 10 and the inner hole of the crawling gear driven gear 7. The crawling gear driven gear 7 is externally meshed with the gear at one end of the crawling gear duplex gear 4. A crawling gear meshing sleeve 6 is also coaxially installed at this end of the meshing gear seat 10. The outer circle of the meshing gear seat 10 is spline-engaged with the inner hole of the crawling gear meshing sleeve 6. A needle bearing 2 15 is installed between the inner hole of this end of the meshing gear seat 10 and the outer circle of the direct gear seat 16. The other end of the meshing gear seat 10 is coaxially installed at the inner hole of the shuttle gear meshing gear seat 19. A needle bearing 3 20 is installed between the outer circle of the meshing gear seat 10 and the inner hole of the shuttle gear meshing gear seat 19. One end of the meshing gear seat 10 is meshed with one end of the shuttle gear duplex gear assembly 18 through an external gear.

[0022] The crawler gear shift fork 5 is also included. One end of the crawler gear shift fork 5 is coaxially installed in the outer annular groove of the crawler gear engagement sleeve 6, and the other end is coaxially fixed on the crawler gear shift fork 5 shaft.

[0023] It also includes a hole retaining ring 14, which is arranged between the auxiliary speed change output shaft 17 and the direct gear seat 16 to prevent the direct gear seat 16 from moving leftward.

[0024] The right end of the crawler gear engagement sleeve 6 is provided with an external spline, and the left end of the crawler gear driven gear 7 is provided with an internal spline, and the internal spline matches the external spline.

[0025] The creeper gear engagement sleeve 6 is provided with an internal spline, and the left outer circle of the direct gear seat 16 is provided with an external spline, and the internal spline and the external spline match each other.

[0026] It also includes a shuttle gear shift fork, and one end of the shuttle gear shift fork is coaxially sleeved on the outer annular groove of the shuttle gear engaging sleeve. The shuttle gear engaging sleeve is sleeved on the shuttle gear engaging tooth seat 19 and is connected through a spline. An internal spline is provided on the right side of the engaging tooth seat 10, and the internal spline matches the external spline on the left side of the shuttle gear engaging sleeve.

[0027] During use of the utility model, the creeping gear of the tractor is a low-speed gear which can output high torque at low speed and can be used for climbing, low-speed operation and special operation.

[0028] Direct gear: Move the crawler gear fork shaft used for crawler gear operation to move the crawler gear fork 5 to the left to set the stroke, and then drive the crawler gear engagement sleeve 6 to move left, and engage with the direct gear gear seat 16 by spline. At this time, the operation of the auxiliary transmission output shaft 17 directly drives the direct gear seat 16 to rotate, and then drives the crawler gear engagement sleeve 6 to rotate, and synchronously drives the engagement gear seat 10, the shuttle gear engagement sleeve, and the shuttle gear engagement gear seat 19 to rotate, and then drives the output shaft connected to the wheel on the right side, thereby driving the vehicle to rotate.

[0029] 19. The crawler gear is engaged when the gear shift fork 5 is engaged with the gear shift shaft 17. The crawler gear is engaged when the gear shift fork 5 is engaged with the gear shift shaft 17. The crawler gear is engaged when the gear shift fork 5 is engaged with the gear shift shaft 17. The crawler gear is engaged when the gear shift fork 5 is engaged with the gear shift shaft 17.

[0030] The use of two-stage reduction can achieve a larger transmission ratio, and the transmission ratio i≥10 can be achieved, which can meet a wider range of working conditions. It is simple to assemble and has low cost. It can achieve a lower speed to meet the crawling gear control requirements of micro-climbing conditions.

[0031] 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 crawler gear transmission structure, comprising a crawler gear duplex gear (4), a crawler gear engagement sleeve (6), a crawler gear passive gear (7), an engagement gear seat (10), a direct gear seat (16) and an auxiliary speed change output shaft (17), characterized in that: The inner hole of one end of the crawling gear double gear (4) is coaxially mounted with a rolling bearing 1 (3), and the other end coaxially passes through the shuttle gear double gear assembly (18) and the rolling bearing 2 (8), the inner ring of the rolling bearing 1 (3) is coaxially mounted on the outer circle of one end of the upper end cover (2), the upper end cover (2) is fixed to one end of the upper hole of the gearbox body (1) by bolts, and the outer ring of the rolling bearing 2 (8) is coaxially mounted on the inner hole of the rear axle box body (9); One end of the auxiliary speed change output shaft (17) is externally meshed with one end of the crawler gear double gear (4), and a direct gear gear seat (16) is coaxially mounted on the end of the auxiliary speed change output shaft (17), and the outer circle of the auxiliary speed change output shaft (17) and the inner hole of the direct gear gear seat (16) are internally meshed with gears; The meshing tooth seat (10) is provided with a crawling gear driven gear (7) and a bearing retaining ring (12) on one end of the coaxial sleeve, and is limited by a retaining ring (13). A needle bearing (11) is installed between the outer circle of the meshing tooth seat (10) and the inner hole of the crawling gear driven gear (7). The crawling gear driven gear (7) is meshed with the gear on one end of the crawling gear double gear (4). The meshing tooth seat (10) is also coaxially provided with a crawling gear meshing sleeve (6). The outer circle of the meshing tooth seat (10) is meshed with the crawling gear meshing sleeve (6). The inner hole of the sleeve (6) is spline-engaged, and a second needle bearing (15) is installed between the inner hole of the meshing tooth seat (10) at this end and the outer circle of the direct gear tooth seat (16). The other end of the meshing tooth seat (10) is coaxially installed at the inner hole of the shuttle gear meshing tooth seat (19), and a third needle bearing (20) is installed between the outer circle of the meshing tooth seat (10) and the inner hole of the shuttle gear meshing tooth seat (19). One end of the meshing tooth seat (10) is meshed with one end of the shuttle gear double gear assembly (18) through an external gear.

2. A creeper gear transmission structure for a tractor according to claim 1, characterized in that: It also includes a crawler gear shift fork (5), one end of which is coaxially mounted in the outer annular groove of the crawler gear engagement sleeve (6), and the other end of which is coaxially fixed on the crawler gear shift fork (5) shaft.

3. The creeper gear transmission structure of a tractor according to claim 1, characterized in that: The invention also comprises a hole retaining ring (14), which is arranged between the auxiliary speed change output shaft (17) and the direct gear seat (16) and is used to prevent the direct gear seat (16) from moving leftward.

4. The creeper gear transmission structure of a tractor according to claim 1, characterized in that: The right end of the crawler gear engagement sleeve (6) is provided with an external spline, and the left end of the crawler gear driven gear (7) is provided with an internal spline, and the internal spline matches the external spline.

5. The creeper gear transmission structure of a tractor according to claim 4, characterized in that: The crawler gear engagement sleeve (6) is provided with an internal spline, and the left outer circle of the direct gear seat (16) is provided with an external spline, and the internal spline matches the external spline.

6. The creeper gear transmission structure of a tractor according to claim 1, characterized in that: The invention also includes a shuttle gear shift fork, and one end of the shuttle gear shift fork is coaxially sleeved on the outer annular groove of the shuttle gear engagement sleeve, the shuttle gear engagement sleeve is sleeved on the shuttle gear engagement tooth seat (19) and connected through a spline, and an internal spline is provided on the right side of the engagement tooth seat (10), and the internal spline matches the external spline on the left side of the shuttle gear engagement sleeve.

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