Two-way hydraulically-driven clutch structure of loader gearbox
By eliminating the piston return spring of the loader gearbox clutch and adopting a two-way hydraulic drive structure, the flow of hydraulic oil is controlled by an overflow valve and a damping orifice. This solves the problem that the friction coefficient of the friction plate and the elastic coefficient of the piston return spring are difficult to meet the precision requirements of high-end gearboxes, thus achieving precise control and cost reduction.
Patent Information
- Application Number
- CN202520002227.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2035-01-02
AI Technical Summary
In the existing loader gearbox clutch structure, the friction coefficient of the friction plate and the elastic coefficient of the piston return spring are required to be high, which makes it difficult to meet the precision requirements of high-end gearboxes, resulting in high production costs and difficulty in control.
The clutch structure employs a two-way hydraulic drive, eliminating the piston return spring. The flow of hydraulic oil is controlled through an overflow valve and a damping orifice, precisely regulating the piston's movement and eliminating reliance on the return spring.
It achieves precise control of the clutch piston movement, reduces production costs, improves mass production efficiency, and simplifies assembly and maintenance processes.
Smart Images
Figure CN223524267U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to loader drive axle gearbox technical field, concretely relates to the clutch structure of loader gearbox hydraulic drive. BACKGROUND
[0002] The clutch is the indispensable transmission gear structure in the multi-gear automatic gearbox of engineering machinery, and in the high-end engineering machinery field paying more and more attention to driving experience, the high-end gearbox has the characteristics of multiple gears, automatic gear shifting, smooth gear shifting process and comfortable driving experience, and the main method for the high-end gearbox to realize smooth gear shifting lies in the accurate control of the piston movement of the clutch during the gear shifting process, and in order to achieve the purpose, the combined force and combined time of the piston and the friction plate during the power switching movement of the clutch need to be accurately controlled after repeated verification. The clutch piston movement in the clutch structure of the existing loader gearbox is generally controlled by the combination of one-way hydraulic oil and spring, when the clutch piston moves towards the friction plate, the clutch piston is driven by the hydraulic oil, at this time, the clutch piston overcomes the resistance of the return spring to press the friction plate to transmit torque, when the clutch piston has no hydraulic driving force, the return spring drives the clutch piston to move reversely away from the friction plate, due to the influence of the material and processing technology of the spring, the spring coefficient fluctuates greatly in a whole batch of springs, and it is difficult to meet the accuracy requirements of the clutch piston movement in the high-end gearbox, and in order to meet the design requirements, the clutch manufacturer needs to purchase the highest quality grade spring and test the movement of the assembled clutch, and the manufacturing cost is high. Therefore, the clutch structure of the existing loader gearbox driven by hydraulic pressure has the problems of high requirements for the friction coefficient of the friction plate and the spring coefficient of the piston return spring, and it is difficult to meet the requirements in actual production practice. SUMMARY
[0003] The utility model discloses a kind of clutch structures of loader gearbox bidirectional hydraulic drive, with simple and compact structure, low manufacturing and maintenance cost, easy adjustment and good control effect, solve the problem that the friction coefficient of the friction plate and the spring coefficient of the piston return spring of existing loader clutch are high, and it is difficult to meet the requirements in actual production practice.
[0004] To achieve the above object, the utility model discloses the clutch structure of two -way hydraulic drive of loader gearbox includes friction plate 1, clutch hub 2, clutch piston 3, overflow valve 4 and clutch axle 5, the clutch piston 3 is installed in clutch hub 2, and friction plate 1 is equipped in the left end of clutch piston 3, the overflow valve 4 includes locking plug 8, spring 9 and steel ball 10, and this overflow valve 4 is equipped in the hydraulic oil circuit in clutch axle 5, the piston front end cavity 6 is equipped between clutch axle 5 and clutch piston 3, the damping hole 7 that is communicated with piston front end cavity 6 is equipped in clutch axle 5, when the hydraulic oil flows from the center oil way right end of clutch axle 5 and reaches the clutch, the hydraulic oil can reach overflow valve 4 and piston front end cavity 6 simultaneously.
[0005] The utility model discloses the clutch structure of two -way hydraulic drive of loader gearbox cancels the piston reset spring of prior art, and instead adds a hydraulic cavity 6 in the front end of piston, and introduces a hydraulic oil to hydraulic cavity 6 from the original hydraulic oil circuit through adding a damping hole 7 to drive piston reset, and adds an overflow valve 4 in the original hydraulic oil circuit, when pressure is less than the set value of overflow valve 4, the hydraulic oil can only flow to piston front end cavity 6, at this time, piston resets, when pressure is greater than the set value of overflow valve 4, the hydraulic oil reaches the front end and rear end of piston simultaneously, because the cross section area of front cavity and rear cavity is different, at this time, the hydraulic oil drives piston to move forward. The pressure set value in the structure is controlled by overflow valve 4, and the front end hydraulic flow is controlled by the aperture of damping hole 7, thereby completely avoiding the influence of reset spring on clutch piston movement in prior art.
[0006] The above -mentioned clutch structure of two -way hydraulic drive of loader gearbox has the following technical features and beneficial effects by canceling the existing piston return spring:
[0007] 1, the movement of clutch piston to compress friction plate to transmit torque and to relax friction plate to cut off torque is all replaced by hydraulic drive, and the binding force and binding time of piston and friction plate in the movement process can be accurately controlled by adjusting hydraulic pressure and flow, which is beneficial to improve batch production efficiency and reduce cost of high-end gearbox.
[0008] 2, simple and compact structure, low manufacturing and maintenance cost, convenient adjustment and good control effect. ACCURACY
[0009] Figure 1 It is the main cross-sectional view schematic drawing of the clutch structure of two -way hydraulic drive of loader gearbox of the utility model.
[0010] Figure 2 It is Figure 1 the cross-sectional enlarged structure schematic drawing of overflow valve.
[0011] Fig. 1 is a schematic view of the clutch structure of the utility model. DETAILED DESCRIPTION
[0012] The utility model discloses a loader gearbox bidirectional hydraulic drive's clutch structure further detailedly makes the specific implementation.
[0013] Figures 1-2 The utility model discloses a loader gearbox bidirectional hydraulic drive's clutch structure includes friction disc 1, clutch hub 2, clutch piston 3, overflow valve 4 and clutch axle 5, the clutch piston 3 is installed in clutch hub 2, and the friction disc 1 is located at the left end of clutch piston 3, the overflow valve 4 includes locking plug 8, spring 9 and steel ball 10, and this overflow valve 4 is located in the hydraulic oil circuit in clutch axle 5, the piston front end cavity 6 is equipped between clutch axle 5 and clutch piston 3, the damping hole 7 that is communicated with piston front end cavity 6 is equipped in clutch axle 5, so that when hydraulic oil flows from the center oil circuit right end of clutch axle 5 to clutch, hydraulic oil can reach overflow valve 4 and piston front end cavity 6 simultaneously.
[0014] When hydraulic oil pressure is lower than the set value of overflow valve 4, the oil circuit to the rear end of clutch piston 3 is blocked by steel ball 10, and hydraulic oil can only flow to piston front end cavity 6 through damping hole 7, at this time, hydraulic oil pushes clutch piston 3 to move away from friction disc 1, and the clutch is in the state of cutting off torque, when hydraulic oil pressure is higher than the set value of overflow valve 4, hydraulic oil pushes away steel ball 10 and flows to the rear end of clutch piston 3 and piston front end cavity 6, because the areas of the front and rear cavities of the piston are different, at this time, the force on the rear end of the piston is greater than that on the front end, and the piston moves to friction disc 1, and the friction disc 1 is pressed to be in the state of transmitting torque. In the debugging process, the piston return hydraulic oil flow can be controlled by expanding or reducing the aperture of damping hole 7, and the pre-tightening force of spring 9 can be controlled by adjusting the position of locking plug 8, thereby adjusting the overflow set value, and the set value of overflow valve 4 is the highest pressure value of the return hydraulic oil of clutch piston 3.
[0015] The utility model discloses a loader gearbox bidirectional hydraulic drive's clutch structure cancels the existing clutch piston return spring, and instead uses bidirectional hydraulic drive to control piston return movement, and the combination force and combination time parameters of the piston and the friction disc in the piston return process can be adjusted and accurately controlled by adjusting the return pressure and return flow, which has the characteristics of convenient adjustment and good control effect.
Claims
1. A bidirectional hydraulically driven clutch structure for a carrier gearbox, comprising a friction plate (1), a clutch hub (2), a clutch piston (3), and a clutch shaft (5); wherein the clutch piston (3) is installed inside the clutch hub (2), and the friction plate (1) is located at the left end of the clutch piston (3); characterized in that: It also includes overflow valve (4); the overflow valve (4) includes locking plug (8), spring (9) and steel ball (10), the overflow valve (4) is arranged in the hydraulic oil circuit in clutch shaft (5);The clutch shaft (5) is provided with piston front end cavity (6) between clutch piston (3);The clutch shaft (5) is provided with damping hole (7) communicated with piston front end cavity (6), so that when hydraulic oil flows from the right end of the central oil circuit of clutch shaft (5) into clutch, hydraulic oil can reach overflow valve (4) and piston front end cavity (6) simultaneously.