Wear-resistant gear shifting structure and transfer case

Abstract

The abrasion-resistant gear shifting structure comprises a piston, an output half shaft and an air cylinder body, the piston and the output half shaft are arranged in parallel, a part of the piston and a part of the output half shaft are arranged in a transfer case shell, the air cylinder body is fixedly connected with the transfer case shell, and one end of the piston penetrates through the transfer case shell and extends into the air cylinder body. The other end of the spring extends into a spring groove in the transfer case shell; the spring is arranged on a piston in the transfer case shell in a sleeving manner and extends into the spring groove, the shifting fork is arranged on a boss in the middle of the piston in a sleeving manner and is fixedly connected with the boss through a bolt, the gear shifting sleeve is arranged on the output half shaft in a sleeving manner, the bearing is arranged on the gear shifting sleeve in a sleeving manner, and the bearing seat is arranged on the bearing in a sleeving manner; the other end of the shifting fork is tightly attached to the bottom of the spring groove. The bearing is arranged between the shifting fork and the spline housing, so that relative movement between the shifting fork and the spline housing is converted into rotation of the rollers in the bearing, the shifting fork is in a non-abrasion state, and the service life of the shifting fork is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to transfer case technical field especially relates to a wear -resisting gear shifting structure and transfer case. BACKGROUND

[0002] As a kind of engineering machinery high-end product, crane has the advantage of high-speed running and high off-road performance, is widely used in wind power, oil field, petrochemical and other major project fields.Transfer case is the key core component of crane chassis transmission system, it is arranged between gearbox and drive axle, the input shaft of transfer case is connected from the power of gearbox output end, the front and rear output ends of transfer case are connected with the main reducer of front and rear drive axle of complete machine, the transmission ratio and transmission route of complete machine chassis transmission system are adjusted by the combination of different speed ratio gears in transfer case, different use conditions are satisfied, and the economy of complete vehicle is guaranteed.

[0003] At present, under the running condition of crane, the gear position executing device of high-low gear is in running state for a long time, and as an important part of gear position executing device, the end face of shift fork is in wear state for a long time, which seriously affects its service life, and is not conducive to the working stability and reliability of transfer case of complete vehicle. UTILITY MODEL CONTENTS

[0004] In order to solve the problem that the gear position executing device of high-low gear is in running state for a long time under the running condition of crane in the prior art, the end face of shift fork is in wear state for a long time, which seriously affects its service life, the utility model provides a wear-resistant gear shifting structure and transfer case, to provide a gear shifting control device with high reliability and wear resistance.

[0005] The utility model is realized through the following technical schemes: including piston, output half shaft and cylinder body that are arranged in parallel and have a part in the inside of transfer case shell, the one end of piston passes through transfer case shell and extends into the inside of cylinder body, the other end extends into spring groove in the inside of transfer case shell, further including spring that is sleeved on piston in the inside of transfer case shell and extends into spring groove, shift fork that is sleeved on the boss in the middle of piston and is fixedly connected through bolt, gear shifting sleeve that is sleeved on output half shaft, bearing that is sleeved on gear shifting sleeve and bearing seat that is sleeved on bearing, the one end of spring is close to the boss in the middle of piston, the other end is close to the bottom of spring groove, and shift fork is clamped on bearing seat.

[0006] As further preferred, the distance between the part of piston extending into spring groove and the bottom of spring groove is greater than the working distance of piston.

[0007] As further preferred, the bottom of spring groove is provided with through hole, the diameter of through hole is greater than the outer diameter of the part of piston extending into spring groove and less than the inner diameter of spring, and the diameter of spring groove is greater than the outer diameter of spring.

[0008] As a further preferred, an adjusting washer is arranged between the shift fork and the piston.

[0009] As a further preferred, the shift sleeve is a spline sleeve; and the bearing is a deep groove ball bearing.

[0010] As a further preferred, a sensor is further arranged on the cylinder block.

[0011] As a further preferred, a sealing washer is arranged between the cylinder block and the piston.

[0012] As a further preferred, the sealing washer is an O-ring.

[0013] As a further preferred, the shift fork is combined by an arc segment and a straight segment, the straight segment is arranged in the middle of the non-opening end of the arc segment, the bearing seat outer ring is symmetrically provided with two straight grooves, and the opening end of the arc segment of the shift fork is clamped at the straight groove of the bearing seat.

[0014] The utility model also provides a transfer case which comprises the wear-resistant shift structure designed by the utility model.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. The utility model discloses a bearing arranged between the shift fork and the spline sleeve of the transfer case, the outer ring of the bearing is tightly matched with the bearing seat, the inner ring of the bearing is tightly matched with the spline sleeve, the relative movement between the shift fork and the spline sleeve is converted into the rotation of the roller in the bearing, the shift fork is in the non-wearing state, and the service life of the shift fork is prolonged.

[0017] 2. The utility model discloses a limited space structure is utilized ingeniously, improves the working life of the whole shift mechanism, and the whole shift process is more stable and reliable.

[0018] 3. The utility model discloses a transfer case uses the wear-resistant shift structure core part designed by the utility model, thereby improving the service life of the whole transfer case. DRAWINGS

[0019] Figure 1 It is the whole structure schematic diagram of the utility model.

[0020] Figure 2 It is Figure 1 It is the A-A section view of the shift fork-bearing seat-bearing structure partial enlarged view.

[0021] Figure 3 It is Figure 2 It is the B-B section enlarged view.

[0022] Figure 4The utility model discloses a bearing seat structure partial enlarged view.

[0023] Indicated in the drawing:

[0024] 1, sensor;2, cylinder block;3, gasket;4, transfer case housing;5, adjusting washer;6, shift fork;7, spring;8, bearing seat;9, bearing;10, gear shift sleeve;11, output half shaft;12, piston. DETAILED DESCRIPTION

[0025] The advantages and characteristics of the utility model will be illustrated and explained through the non-restrictive description of the following preferred embodiments, and these embodiments are only given as examples with reference to the drawings.

[0026] As Figures 1 to 3 Indicated in the drawing:

[0024] 1, sensor;2, cylinder block;3, gasket;4, transfer case housing;5, adjusting washer;6, shift fork;7, spring;8, bearing seat;9, bearing;10, gear shift sleeve;11, output half shaft;12, piston. The piston 12 and output half shaft 11 are parallelly arranged and each has a part in the inside of transfer case housing 4.Cylinder block 2 is fixedly connected with transfer case housing 4 through bolt.The piston 12 passes through transfer case housing 4 and extends into the inside of cylinder block 2, and the other end extends into the spring groove in the inside of transfer case housing 4.The spring 7 is sleeved on the piston 12 in the inside of transfer case housing 4 and extends into the inside of spring groove, and one end of the spring 7 is close to the middle boss of piston 12, and the other end is close to the bottom of spring groove.In order to make the piston 12 slide unrestrictedly, the part of piston 12 extending into spring groove can be a certain distance from the bottom of spring groove, and the distance is greater than the working distance of piston 12, or a through hole is formed in the bottom of spring groove, and the diameter of the through hole is greater than the outer diameter of the part of piston 12 extending into spring groove and less than the inner diameter of spring 7.The shift fork 6 is sleeved on the boss in the middle of piston 12 and is fixedly connected through bolt.In order to facilitate the adjustment of the axial distance between shift fork 6 and piston 12, adjusting washer 5 can be arranged between the end face of shift fork 6 and piston 12.The gear shift sleeve 10 is sleeved on output half shaft 11, bearing 9 is sleeved on gear shift sleeve 10, bearing seat 8 is sleeved on bearing 9, and shift fork 6 is clamped on bearing seat 8.The inner ring of bearing 9 is close to gear shift sleeve 10, and the outer ring of bearing 9 is close to bearing seat 8.The gear shift sleeve 10 is preferably a spline sleeve.The bearing 9 is preferably a deep groove ball bearing, and the friction coefficient of deep groove ball bearing is small, is suitable for high speed working condition and can bear axial and radial load.Sensor 1 is arranged on cylinder block 2.In order to prevent gas leakage and ensure the sealing property of cylinder block 2, gasket 3 is arranged between cylinder block 2 and piston 12, and the gasket 3 is preferably O-ring.The diameter of spring groove is slightly greater than the outer diameter of spring 7, preventing spring 7 from deforming during the whole gear shifting process and ensuring the smoothness of the whole gear shifting.

[0027] As Figure 2 shown, the shift fork 6 is combined by an arc segment and a straight line segment, the straight line segment is arranged in the middle of the non-opening end of the arc segment. The opening end of the arc segment of the shift fork 6 is clamped with the bearing seat 8. As Figure 4 shown, in order to increase the contact surface of the bearing seat 8 and the shift fork 6, so that the clamping is more closely, two straight line grooves are symmetrically arranged on the outer ring of the bearing seat 8, and the opening end of the arc segment of the shift fork 6 is clamped at the straight line groove of the bearing seat 8.

[0028] The utility model also provides a transfer case, has used the wear -resisting gear shifting structure of utility model design.

[0029] Under normal circumstances, the gas source is connected, and the power transmission route of each part is: gas source-piston-shift fork-gear shifting sleeve-gear engagement; under the condition of gear disengagement, the power transmission route is: after the gas source is disconnected, the whole gear shifting control device is reset under the action of the spring 7, drives the gear shifting sleeve 10 and the shift fork 6 to disengage, and the piston 12 moves to interrupt power transmission.

[0030] Because the output half shaft 11 of the transfer case is generally in a rotating state during driving, the shift fork 6 is always synchronously operated with the gear shifting sleeve 10, but the shift fork 6 and the piston 12 are static, so that there is relative motion between the shift fork 6 and the gear shifting sleeve 10, and the arc segment of the shift fork 6 is in a long-term wear state, which greatly reduces the working reliability of the shift fork 6. The wear -resisting gear shifting structure designed by the utility model adopts the bearing 9 and the bearing seat 8 arranged between the shift fork 6 and the gear shifting sleeve 10, the outer ring of the bearing 9 is tightly matched with the bearing seat 8, the inner ring of the bearing 9 is tightly matched with the gear shifting sleeve 10, so that the relative motion between the shift fork 6 and the gear shifting sleeve 10 is converted into the rotation of the roller in the bearing 9, the shift fork 6 is in a non-wear state, and the service life of the shift fork 6 is improved.

[0031] In addition to the above-mentioned embodiments, the utility model can also have other implementation manners, and any technical scheme formed by equivalent replacement or equivalent transformation falls within the protection scope required by the utility model.

Claims

1. A wear-resistant gear shift structure comprising pistons (12) and output half shafts (11) arranged in parallel and each having a part inside a transfer case housing (4), and a cylinder block (2) fixedly connected with the transfer case housing (4), characterized in that: The piston (12) extends into the inside of the cylinder body (2) through the transmission case shell (4) at one end and extends into the spring groove inside the transmission case shell (4) at the other end, further comprising a spring (7) sleeved on the piston (12) inside the transmission case shell (4) and extending into the spring groove, a shift fork (6) sleeved on the boss of the middle part of the piston (12) and fixedly connected by bolts, a shift sleeve (10) sleeved on the output half shaft (11), a bearing (9) sleeved on the shift sleeve (10), and a bearing seat (8) sleeved on the bearing (9), one end of the spring (7) abutting against the middle boss of the piston (12), and the other end abutting against the bottom of the spring groove, and the shift fork (6) being clamped on the bearing seat (8).

2. The wear-resistant shift structure of claim 1, wherein: The distance between the piston (12) extending into the spring groove part and the bottom of the spring groove is greater than the working distance of the piston (12).

3. The wear-resistant shift structure of claim 1, wherein: The bottom of the spring groove is provided with a through hole, the diameter of the through hole is greater than the outer diameter of the piston (12) extending into the spring groove part and less than the inner diameter of the spring (7); and the diameter of the spring groove is greater than the outer diameter of the spring (7).

4. The wear-resistant shift structure of claim 1, wherein: An adjusting gasket (5) is arranged between the shift fork (6) and the piston (12).

5. The wear resistant shift structure of claim 1, wherein: The shift sleeve (10) is a spline sleeve; and the bearing (9) is a deep groove ball bearing.

6. The wear-resistant shift structure of claim 1, wherein: The cylinder body (2) is further provided with a sensor (1).

7. The wear resistant shift structure of claim 1, wherein: A sealing gasket (3) is arranged between the cylinder body (2) and the piston (12).

8. The wear-resistant shift structure according to claim 7, characterized in that: The sealing gasket (3) is an O-ring.

9. The wear-resistant shift structure of claim 1, wherein: The shift fork (6) is composed of an arc-shaped part and a straight line part, the straight line part is arranged in the middle of the non-opening end of the arc-shaped part, the outer ring of the bearing seat (8) is symmetrically provided with two straight line grooves, and the opening end of the arc-shaped part of the shift fork (6) is clamped at the straight line groove of the bearing seat (8).

10. A transfer case characterized by: The wear-resistant shift structure comprises the piston (12) according to any one of claims 1 to 9. The wear-resistant shift structure comprises the piston (12) according to any one of claims 1 to 9.

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