CN201025299Y

CN201025299Y - Shift operation and control valve with buffering device

Info

Publication number: CN201025299Y
Application number: CNU200720106354XU
Authority: CN
Inventors: 余海洋; 陈莉; 王祥
Original assignee: ZHEJIANG LINHAI HAIHONG GROUP CORP Ltd
Current assignee: ZHEJIANG LINHAI HAIHONG GROUP CORP Ltd
Priority date: 2007-02-08
Filing date: 2007-02-08
Publication date: 2008-02-20
Anticipated expiration: 2017-02-08

Abstract

The utility model discloses a variable speed controlling valve with cushioning device, mainly comprising a cut-off valve, a distributing valve, a cushion valve, and a relief valve, etc. in the valve body. The relief valve and the cushion valve in the valve body are arranged on the same axis and opposite to each other with a space in the middle, also has an oil line connected with each other therebetween. Shifting gear stationary without impact after adopting the structure. The process of boost pressure of the clutch cylinder has two properties of steady and tenderness, reduces impact and abrasion, not only has good handling comfort, but also better protect the components of the clutch. The utility model can be directly used in the existing loader gearbox of ZL40 and ZL50, has good generality and fast popularization, also has simple and reliable structure, can be convenient for using and greatly reduce the manufacturing cost.

Description

The speed change control valve of band damping device

Affiliated technical field

The utility model relate to engineering machinery the power gear shifting shift control system, especially a kind of speed change control valve with damping device.

Background technique

The engineer machinery operation operating mode is more abominable, the running condition complexity, and gearshift is frequent.With the loader is example, and each work cycle need be shifted gears 4～5 times, works continuously and per hour shifts gears nearly thousand times.At present, the shift control system used of domestic engineering machinery mostly adopts machine liquid shift control.Existing homemade loader dynamic power shift gear box generally adopts machine liquid shift control, because design is not steadily in conjunction with control unit in the speed change valve, gearshift moment clutch is in conjunction with rough, and shift impact is big, make transmission system produce bigger dynamic load, quicken the damage of part.Improving shift quality, realize the flexible labor intensity of shifting gears and improving shift control, is an important directions that improves homemade dynamic power shift gear box general technical level.

The model utility content

The technical problems to be solved in the utility model provides a kind of speed change control valve that has damping device, reduce when this speed change control valve can not only gear shift and impact and wearing and tearing, and simple in structure, easily manufactured, versatility is good.

The technological scheme that its technical problem that solves the utility model adopts is: the speed change control valve of band damping device, mainly form by the cut-off valve in valve body, distributing valve, trimmer valve, relief valve etc., it is characterized in that: relief valve is in about same axis with trimmer valve and separates in the middle of the relative branch in valve body, has oil circuit to communicate between the two in addition.

Described left side relief valve mainly is made up of plunger, overflow spool, spring and pad, and the right trimmer valve mainly is made up of spool, pressure spring and spool.

Described cut-off valve is located at the valve body middle part, and it mainly is made up of spring, brake valve rod, air valve body assembly.

The distribution valve rod of described control gear is by spring and steel ball location.

The beneficial effects of the utility model are: owing to adopted technique scheme, make the utility model compare with existing ZL40, zl50 loader speed change control valve, have following advantage: gearshift does not steadily have impact, when gear shift, the process of boosting of clutch oil cylinder is steady, soft two-step characteristics, reduced and impacted and wearing and tearing, not only handling comfort is good, and has protected component such as clutch better; Can directly use in existing ZL40, zl50 loader gearbox, versatility is good, promotes fast; Simple in structure, reliable, easy to use, can reduce manufacture cost greatly.

Description of drawings

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is that the A-A of Fig. 1 analyses and observe oil duct figure.

Fig. 3 is the R-R sectional view of Fig. 1.

Among the figure 1, valve body 2, plunger 3, overflow spool 4, spring 5, spool 6, pressure spring 7, spool 8, end cap 9, air valve body assembly 10, distribute valve rod 11, steel ball 12, spring 13, brake valve rod 14, spring 15, pad 16, throttling sheet 17, hexagonal socket head plug

Embodiment

With reference to accompanying drawing as can be known, the utility model is integral combined speed change control valve, includes a plurality of valves such as cut-off valve, distributing valve, trimmer valve, relief valve in valve body, and its topmost improvement is to have increased damping device on trimmer valve.Specifically be on former speed change control valve basis, the through hole of former control valve valve body is divided into obstructed left and right sides two-part: relief valve and trimmer valve, promptly relief valve and trimmer valve are in about same axis and separate in the middle of the relative branch in valve body.Left side relief valve is made up of plunger 2, overflow spool 3, spring 4 and pad 16, the pressure oil pressure of these overflow spool 3 left ends and the active force of spring 4 balance each other, spring 4 right-hand members withstand on the valve opening bottom, the C chamber is the filler opening of gearbox, the D chamber communicates with torque-converters, the L chamber is an oil back chamber, and pad 16 is used as setting up gear pressure.The right trimmer valve is made up of spool 5, pressure spring 6 and spool 7, the buffering valve opening has 2 clear opening H, I in the left part, be connected to oil duct T, withstand with end cap 8 these spool 7 right parts, and on as Fig. 2 A-A sectional view, showing P chamber oil-return groove, back slotted hole M and throttling pore N are communicated with relief valve C chamber and trimmer valve E chamber respectively.Spool 5 is columniform, and there is step the centre, and the axial long aperture G and a radial hole F of blind hole are arranged in the middle of spool 5, uses as oil return.And trimmer valve is provided with and has orifice restriction sheet 16 on Fig. 3 R-R sectional view, blocks with hexagonal socket head plug 17.Relief valve, trimmer valve, cut-off valve, distributing valve and each chamber are communicated with by oil duct.

As shown in Figure 1, variable speed pump comes oil behind diesel engine starting, enters from the C chamber, and when pressure oil pressure during greater than the pressure of spring 4, oil goes with regard to the torque-converters system that the C chamber flows to the D chamber.Meanwhile, pressure oil is by back slotted hole M, and throttling pore N flows to trimmer valve F chamber, and flows to passage T from two oil duct H, I and enter oil duct Q through cut-off valve, leads to distributing valve, the schematic representation when being in Fig. 1 position at neutral gear position the time.When pressure oil pressure during greater than the pressure of spring 6, oil return in the K chamber.

The utility model also is provided with gas control the element----cut-off valve of the skidding that is used for machine hydraulic control system at the middle part of valve body 1.This valve is made up of brake valve rod 13, spring 14, air valve body assembly 9 etc.By the cut-out or the connection of this valve, friction clutch is separated or combination automatically.

Distribution valve rod 10 of the present utility model by changing the position of distributing valve rod 10, makes gearbox be in neutral gear respectively by spring 12 and steel ball 11 location, positions such as a grade, second gear or reverse gear.

The utility model adopts the trimmer valve that has damping device, can make in the moment of shifting gears clutch oil cylinder pressure is steadily risen, and has reduced and has impacted and wearing and tearing, realizes gentle start and flexibility gearshift.

Claims

1. be with the speed change control valve of damping device, mainly form by the cut-off valve in valve body, distributing valve, trimmer valve, relief valve etc., it is characterized in that: relief valve is in about same axis with trimmer valve and separates in the middle of the relative branch in valve body, has oil circuit to communicate between the two in addition.

2. the speed change control valve of band damping device according to claim 1 is characterized in that: described relief valve mainly is made up of plunger, overflow spool, spring and pad, and trimmer valve mainly is made up of spool, pressure spring and spool.

3. the speed change control valve of band damping device according to claim 1 is characterized in that: described cut-off valve is located at the valve body middle part, and it mainly is made up of spring, brake valve rod, air valve body assembly.

4. the speed change control valve of band damping device according to claim 1 is characterized in that: the distribution valve rod of control gear is by spring and steel ball location in the described distributing valve.

5. the speed change control valve of band damping device according to claim 1 and 2, it is characterized in that: described trimmer valve spool is columniform, there is step the centre, and the axial long aperture and a radial hole of blind hole are arranged in the middle of the spool, and is provided with and has the orifice restriction sheet.