Double-spring type gear shifting mechanism and transfer case

Abstract

The double-spring type gear shifting mechanism comprises a piston, the left end of the piston is located in a cavity of an air cylinder, the right end of the piston is connected with a guide rod, the end of the guide rod is connected with a reset spring, and a step section of the guide rod is connected with a guide spring. The reset spring is connected with the transfer case shell, the guide spring is connected with the sleeve, the sleeve is in clearance fit with the transfer case shell, the sleeve is in clearance fit with the pin shaft, the sleeve is fixedly connected with the shifting fork through welding, and the limiting pin is arranged at the tail of the pin shaft. An input shaft assembly is arranged in the transfer case shell. According to the utility model, gear shifting is rapid and smooth, flexible gear engaging is realized, gear engaging impact force energy recovery is realized, gear engaging noise is low, the service life is long, and the working stability and reliability of the whole vehicle transfer case are improved.

Description

Technical Field

[0001] The utility model relates to the field of transfer cases, in particular to a double-spring type shift mechanism and a transfer case. Background Art

[0002] As a type of construction machinery, cranes offer both high-speed travel and excellent off-road performance, making them widely used in major projects such as wind power, oil fields, and petrochemicals. The transfer case is a key component of the chassis drive system of all-terrain cranes. The transfer case's input shaft connects to the power output of the gearbox, while the front and rear outputs connect to the machine's front and rear transfer case final reducers. By combining different speed ratios within the transfer case, the speed ratio and transmission path of the chassis drive system are adjusted to meet diverse operating conditions and ensure overall vehicle efficiency.

[0003] At present, when the crane is in driving condition, the high and low gear actuators of the transfer case often have difficulty in shifting gears, which seriously affects its service life and is not conducive to the working stability and reliability of the transfer case of the entire vehicle.

[0004] Therefore, it is necessary to develop a new type of shifting mechanism in a targeted manner to improve the efficiency of the shifting operation and enhance the reliability of the transfer case. Utility Model Content

[0005] Purpose of the utility model: In view of the deficiencies and defects of the existing technology, the utility model provides a double-spring shift mechanism and transfer case, which has fast and smooth shifting, flexible gear shifting, energy recovery of gear shifting impact force, low gear shifting noise, long service life, and improves the working stability and reliability of the transfer case of the whole vehicle.

[0006] Technical solution: The utility model is a double-spring shift mechanism, characterized in that it includes a piston, the left end of the piston is located in the cavity of the cylinder, the right end of the piston is connected to the guide rod, the end of the guide rod is connected to the return spring, and the stepped section of the guide rod is connected to the guide spring; the return spring is connected to the transfer case housing, the guide spring is connected to the sleeve, the sleeve and the transfer case housing are clearance-fitted, the sleeve and the pin shaft are clearance-fitted, the sleeve and the shift fork are fixedly connected by welding, and a limit pin is provided at the tail of the pin shaft; an input shaft assembly is provided in the transfer case housing.

[0007] Wherein, the input shaft assembly includes a bearing, a shift fork, a low-speed gear, a spline sleeve and a high-speed gear.

[0008] Wherein, the shift fork is clamped in the spline sleeve.

[0009] Wherein, the shift fork is clamped in the annular groove of the spline sleeve.

[0010] Wherein, the cylinder is fixedly connected to the transfer case housing through a plurality of bolts.

[0011] Wherein, the return spring is connected to the large end of the guide rod.

[0012] Wherein, the small end of the sleeve is a flat structure.

[0013] A transfer case with a double-spring shift mechanism.

[0014] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages: the utility model shifts gears quickly and smoothly, has a long service life, and improves the working stability and reliability of the transfer case of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 This is a schematic structural diagram of the sleeve of the present utility model;

[0017] In the figure, 1 is the cylinder; 2 is the piston; 3 is the guide spring; 4 is the return spring; 5 is the pin; 6 is the sleeve; 7 is the shift fork; 8 is the limit pin; 9 is the low-speed gear; 10 is the spline sleeve; and 11 is the high-speed gear. DETAILED DESCRIPTION

[0018] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0019] The dual-spring shift mechanism of the present invention includes a piston 2, the left end of which is located within the cavity of a cylinder 1. The right end of the piston 2 is connected to a guide rod, the end of which is connected to a return spring 4, and the stepped section of the guide rod is connected to a guide spring 3. The return spring 4 is connected to the transfer case housing, and the guide spring 3 is connected to a sleeve 6. The sleeve 6 has a clearance fit with the transfer case housing, and the sleeve 6 has a clearance fit with a pin 5. The sleeve 6 and the shift fork 7 are fixedly connected by welding, and a limit pin 8 is provided at the end of the pin 5. An input shaft assembly is located within the transfer case housing. The input shaft assembly includes a bearing, a shift fork 7, a low-speed gear 9, a spline sleeve 10, and a high-speed gear 11. The shift fork 7 is retained in an annular groove of the spline sleeve 10. The cylinder 1 is fixedly connected to the transfer case housing by a plurality of bolts. The return spring 4 is connected to the large end of the guide rod. The small end of the sleeve 6 is a flat structure, as shown in the figure, which is convenient for storing lubricating oil, reducing the friction resistance between the sleeve 6 and the transfer case housing during the gear shifting process, and achieving smooth gear shifting of the transfer case.

[0020] During operation, when the air supply is connected, the power transmission path between the various components is: air supply → piston rod → shift fork → spline sleeve → low gear engagement. During the gear engagement process, the right end face of the spline sleeve contacts the left end face of the low gear gear, generating an impact force that acts inversely on the guide spring and return spring, causing the springs to recover some of the impact force. Simultaneously, because the guide spring always firmly presses against the guide rod, the guide rod is straightened again. Repeated gear engagement ensures that the guide rod remains straightened, preventing it from skewing and truly achieving a flexible connection between the components. During the gear disengagement process, the power transmission path is as follows: after the air supply is disconnected, the entire shift control device returns to its original position under the action of the return spring, driving the spline sleeve and shift fork to disengage and the piston to the left, interrupting power transmission. The entire gear engagement process is smooth, with the guide spring constantly holding the sleeve in place, ensuring high reliability and stability throughout the gear shifting and disengaging process. This utility model offers fast and smooth gear shifting, flexible gear engagement between components, timely absorption of impact forces during gear engagement, reduced gear engagement noise, a long service life, and improved operational stability and reliability of the vehicle's transfer case.

Claims

1. A double-spring shift mechanism, characterized in that: The invention comprises a piston (2), wherein the left end of the piston (2) is located in the cavity of the cylinder (1), the right end of the piston (2) is connected to a guide rod, the end of the guide rod is connected to a return spring (4), and the stepped section of the guide rod is connected to a guide spring (3); the return spring (4) is connected to a transfer case housing, the guide spring (3) is connected to a sleeve (6), the sleeve (6) is clearance-matched with the transfer case housing, the sleeve (6) is clearance-matched with a pin shaft (5), the sleeve (6) is fixedly connected to a shift fork (7), and a limit pin (8) is provided at the tail of the pin shaft (5); and an input shaft assembly is provided in the transfer case housing.

2. The double-spring shift mechanism according to claim 1, characterized in that: The input shaft assembly comprises a bearing, a shift fork (7), a low-speed gear (9), a spline sleeve (10) and a high-speed gear (11).

3. The double-spring shift mechanism according to claim 2, characterized in that: The shift fork (7) is clamped in the spline sleeve (10).

4. The double-spring shift mechanism according to claim 3, characterized in that: The shift fork (7) is clamped in the annular groove of the spline sleeve (10).

5. The double-spring shift mechanism according to claim 1, characterized in that: The cylinder (1) is fixedly connected to the transfer case housing via a plurality of bolts.

6. The double-spring shift mechanism according to claim 1, characterized in that: The return spring (4) is connected to the large end of the guide rod.

7. The double-spring shift mechanism according to claim 1, characterized in that: The small end of the sleeve (6) is a flat structure.

8. A transfer case using the double-spring shift mechanism according to any one of claims 1 to 7.

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