CN211820703U

CN211820703U - Hydraulic speed-changing control valve

Info

Publication number: CN211820703U
Application number: CN202020239292.5U
Authority: CN
Inventors: 楼国意
Original assignee: Ningbo Yinzhou Fangcheng Hydraulic Members Co ltd
Current assignee: Ningbo Yinzhou Fangcheng Hydraulic Members Co ltd
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2020-10-30
Anticipated expiration: 2030-03-02

Abstract

The utility model discloses a hydraulic variable-speed control valve, which belongs to the technical field of loader variable-speed control valves, and comprises a valve body consisting of a pressure regulating valve group, a brake valve group and a gear shifting valve group, the pressure regulating valve group, the brake valve group and the gear shifting valve group are communicated through an oil inlet path, the gear shifting valve group comprises a gear shifting valve cavity, the gear shifting valve cavity is internally provided with a gear shifting valve rod with axial sliding, the inner wall of the gear shifting valve cavity is sequentially provided with a forward first gear oil return port, a forward first gear oil cylinder port, an oil inlet, a forward second gear oil cylinder port, a forward second gear oil return port, an oil inlet, a reverse gear oil cylinder port and a reverse gear oil return port along the axial direction, the oil inlet can be slowly opened in each gear shifting process, the oil return ports are slowly closed, and due to the throttling effect, one part is in a floating state in the process, the pressure jump generated instantaneously can be discharged through the throttling groove, so that the stable rising of the pressure of the working cavity is ensured.

Description

Hydraulic speed-changing control valve

Technical Field

The utility model relates to a loader variable speed operating valve technical field, more specifically say, relate to a hydraulic pressure variable speed operating valve.

Background

The traveling mode adopted by the current domestic common loader is a planetary gear type power gear shifting gearbox, a gear shifting mechanism of the loader adopts a mechanical variable speed control valve, the problems of overlong gear shifting time (equal gear phenomenon) or overlong gear shifting time (impact phenomenon) and the like frequently occur in the use process of the current product, and through years of analysis and research, the generated main problem is that the gear shifting pressure curve in the gear shifting process is not well controlled. Although many manufacturers have made many improvements and innovations, the effect of using the loader is still not ideal.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

To the problem that exists among the prior art, the utility model aims to provide a hydraulic pressure variable speed operating valve, it can realize, and the cooperation operation requirement that the pressure curve of gear shift process can be perfect has solved the problem of impact and grade in the gear shift process for loader has had very big improvement on the maneuverability, the travelling comfort and the life of going forward, retreating and stopping at the walking in-process.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

The utility model provides a hydraulic pressure speed-changing control valve, includes the valve body of constituteing by pressure regulating valves group, brake valves group and the valves of shifting, through oil feed way intercommunication between pressure regulating valves group, brake valves group and the valves of shifting, the valves of shifting is including the valve pocket of shifting, the inside of the valve pocket of shifting is provided with the gliding valve rod of shifting of equiaxial, it advances one grade oil return opening to have seted up in proper order along its axial on the inner wall of the valve pocket of shifting, advance one grade oil cylinder mouth and do, oil inlet, advance two grade oil cylinder mouths and do, advance two grade oil return openings, supply port, reverse gear oil cylinder mouth and reverse gear oil return opening, the groove of keeping off has still been seted up on the inner wall of the valve pocket of shifting, oil feed way and oil inlet and supply port communicate respectively, the quantity of oil inlet has two, the valve rod of shifting is solid cylinder, it keeps off groove, the gear shifting valve comprises a two-gear groove and a reverse gear oil inlet groove, wherein one end of a gear shifting valve rod extends out of a gear shifting valve cavity and is sleeved with a sealing ring, the sealing ring is connected with the inner wall of the gear shifting valve cavity, and an end cover fixedly connected with a valve body is arranged on the outer side of the sealing ring.

Furthermore, the oil inlet path is communicated with the pressure regulating valve group, the brake valve group and the gear shifting valve group in sequence.

Furthermore, the reverse gear groove is located on the inner wall of the left end of the gear shifting valve cavity, and the reverse gear oil return port is located on the inner wall of the gear shifting valve cavity.

Further, when the gear shifting valve rod is in a neutral gear, the oil inlet groove and the reverse gear oil inlet groove are communicated with an oil inlet path on the valve body, the first catch groove is communicated with the first forward gear oil cylinder port and the first forward gear oil return port, the second catch groove is communicated with the second forward gear oil cylinder port and the second forward gear oil return port, and the reverse catch groove is communicated with the reverse gear oil cylinder port and the reverse gear oil return port.

Furthermore, the surface of the gear shifting valve rod is in close contact with the inner wall of the gear shifting valve cavity, when the gear shifting valve rod is in a neutral gear, the first blocking groove and the first forward gear oil cylinder port form a closed space with the first forward gear oil return port, the oil inlet groove and the oil inlet form a closed space, the second blocking groove, the second forward gear oil return port and the second forward gear oil cylinder port form a closed space, the reverse gear oil inlet groove and the oil supply port form a closed space, and the reverse blocking groove, the reverse gear oil return port and the reverse gear oil cylinder port form a closed space.

Furthermore, a plurality of small throttling grooves are formed in the two sides of the gear shifting valve rod, which are positioned on a first blocking groove, an oil inlet groove, a second blocking groove, a reverse gear oil inlet groove, the reverse gear oil inlet groove and the gear shifting valve rod, the small throttling grooves are formed in the intersection of the first blocking groove, the oil inlet groove, the second blocking groove, the reverse gear oil inlet groove and the outer side face of the gear shifting valve rod, the diameter of each small throttling groove is gradually increased towards the first blocking groove, the oil inlet groove, the second blocking groove, the reverse gear oil inlet groove and the reverse gear groove, and the small throttling grooves are respectively formed in a mode of corresponding to a forward first gear oil return opening, an oil inlet, a forward second gear oil return opening, an oil supply opening, a reverse gear oil return opening, a forward first gear oil cylinder opening, a forward second gear.

3. Advantageous effects

Compared with the prior art, the utility model has the advantages of:

this application, at the gear shift in-process, become the throttle gear shift by the impact gear shift, innovatively used the throttle mode, added the throttle microgroove promptly in the business turn over hydraulic fluid port position of gear shift valve rod for the oil inlet is opened slowly at each gear shift in-process, and the oil return opening is closed slowly, because the effect of throttle, can discharge through the throttle microgroove to the pressure jump that produces in the twinkling of an eye, thereby has guaranteed that working chamber pressure steadily rises.

Drawings

Fig. 1 is a schematic view of the position structure of the present invention;

fig. 2 is a schematic structural diagram of a general shift valve group;

fig. 3 is a schematic structural view of the shift valve assembly of the present invention;

FIG. 4 is a schematic structural diagram of a shift start position in the present invention;

FIG. 5 is a schematic view of the first-shift throttle position of the present invention;

fig. 6 is a schematic structural view of the middle shift ending position of the present invention.

The reference numbers in the figures illustrate:

A. a pressure regulating valve bank; B. a brake valve group; C. a shift valve group; c1, a gear shifting valve cavity; h1, forward first gear oil return; h2, forward second gear oil return port; h3, reverse range oil return; m1, advance first gear oil cylinder port; m2, and an opening of a forward second gear oil cylinder is; m3, reverse cylinder port; p0, oil inlet tank; p1, a baffle groove; p2, a second catch groove; p3, reverse gear oil inlet groove; p4, reverse gear groove; r, an oil inlet path; s, a gear shifting valve rod; r1, an oil inlet; r2, oil supply port; v, valve body.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-6, a hydraulic speed-changing control valve comprises a valve body V composed of a pressure-regulating valve group a, a brake valve group B and a gear-shifting valve group C, the pressure-regulating valve group a, the brake valve group B and the gear-shifting valve group C are communicated with each other through an oil inlet path R, the gear-shifting valve group C comprises a gear-shifting valve cavity C1, a gear-shifting valve rod S sliding in the same axial direction is arranged in the gear-shifting valve cavity C1, a forward first-gear oil return port H1, a forward first-gear oil cylinder port M1, an oil inlet R1, a forward second-gear oil cylinder port M2, a forward second-gear oil return port H2, an oil supply port R2, a reverse gear oil cylinder port M3 and a reverse gear oil return port H3 are sequentially arranged along the axial direction on the inner wall of the gear-shifting valve cavity C1, a reverse gear groove P4 is further arranged on the inner wall of the gear-shifting valve cavity C1, the oil inlet path R is communicated with, a gear groove P1, an oil inlet groove P0, a two-gear groove P2 and a reverse gear oil inlet groove P3 are sequentially formed in the gear shifting valve rod S along the axial direction of the gear shifting valve rod S, one end of the gear shifting valve rod S extends out of a gear shifting valve cavity C1 and is sleeved with a sealing ring, the sealing ring is connected with the inner wall of the gear shifting valve cavity C1, and an end cover fixedly connected with the valve body is arranged on the outer side of the sealing ring.

Specifically, the oil inlet path R is communicated with the pressure regulating valve group A, the brake valve group B and the gear shifting valve group C in sequence.

Specifically, the reverse gear groove P4 is located on the inner wall of the left end of the shift valve chamber C1, and the reverse gear oil return port H3 is located on the inner wall of the shift valve chamber C1.

Specifically, when the shift valve rod S is in the neutral position, the oil inlet groove P0 and the reverse gear oil inlet groove P3 are communicated with the oil inlet path R on the valve body, the first gear groove P1 is communicated with the forward first gear cylinder port M1 and the forward first gear oil return port H1, the second gear groove P2 is communicated with the forward second gear cylinder port M2 and the forward second gear oil return port H2, and the reverse gear groove P4 is communicated with the reverse gear cylinder port M3 and the reverse gear oil return port H3.

Specifically, the surface of the shift valve rod S is in close contact with the inner wall of the shift valve cavity C1, when the shift valve rod S is in a neutral position, a first gear groove P1, a forward first gear cylinder port M1 and a forward first gear oil return port H1 form a closed space, an oil inlet groove P0 and an oil inlet R1 form a closed space, a second gear groove P2, a forward second gear oil return port H2 and a forward second gear cylinder port M2 form a closed space, a reverse gear oil inlet groove P3 and an oil supply port R2 form a closed space, and a reverse gear groove P4, a reverse gear oil return port H3 and a reverse gear cylinder port M3 form a closed space.

Specifically, a plurality of small throttling grooves W are formed in the shift valve rod S and located on two sides of a first blocking groove P1, an oil inlet groove P0, a second blocking groove P2, a reverse gear oil inlet groove P3, a reverse gear groove P4 and the shift valve rod S, the small throttling grooves W are formed in the intersections of the first blocking groove P1, the oil inlet groove P0, the second blocking groove P2, the reverse gear oil inlet groove P3 and the outer side face of the shift valve rod S, the small throttling grooves W are gradually enlarged towards the first blocking groove P1, the oil inlet groove P0, the second blocking groove P2, the reverse gear oil inlet groove P3 and the reverse gear groove P4, the small throttling grooves W respectively correspond to a forward first gear oil return opening H1, an oil inlet opening R1, a forward second gear oil return opening H2, an oil supply opening R2, a reverse gear oil return opening H3, a forward first gear cylinder opening M1, a forward second gear cylinder opening M2 and a reverse gear opening 3, and the small throttling grooves W can be formed in an arc shape.

When in use: the gear shifting process can be divided into four-position six gear shifting from a middle position to a forward first gear, a forward first gear to a forward second gear, a forward second gear to a forward first gear, a forward first gear to a middle position gear, a middle position to a reverse gear and a reverse gear to a middle position gear, wherein the total number of the four-position six gear shifting is four; when the gear shifting valve rod S moves from a neutral gear to a forward first gear, due to the existence of the small throttling groove W, the forward first gear oil cylinder opening M1 and the forward first gear oil return opening H1 are slowly closed, the oil inlet groove P0 and the forward first gear oil cylinder opening M1 are slowly opened, (if the small throttling groove W is not closed and opened instantly in the moving process), when the gear shifting valve rod S moves to a certain position, the forward first gear oil cylinder opening M1 is not closed, the oil inlet R1 is opened, the state is called a floating state, under the condition, the pressure jump of any groove can be eliminated, when the gear shifting valve rod S continues to move, the forward first gear oil cylinder opening M1 and the forward first gear oil return opening H1 are closed, the pressure of the oil inlet R1 is formed in the oil cylinder of the forward first gear, and the loader can smoothly move forward, the operation conditions of other gears are the same.

The above description is only the preferred embodiment of the present invention; the scope of the present invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by replacing or changing the technical solution and the improvement concept of the present invention with equivalents and modifications within the technical scope of the present invention.

Claims

1. The utility model provides a hydraulic pressure change operating valve, includes valve body (V) of constituteing by pressure regulating valves group (A), brake valve group (B) and valve group (C) of shifting, through oil inlet way (R) intercommunication between pressure regulating valves group (A), brake valve group (B) and the valve group (C) of shifting, valve group (C) of shifting is including shifting valve chamber (C1), the inside of shifting valve chamber (C1) is provided with axial gliding valve rod (S) of shifting, its characterized in that: the inner wall of the gear shifting valve cavity (C1) is sequentially provided with a forward first gear oil return port (H1), a forward first gear oil cylinder port (M1), an oil inlet (R1), a forward second gear oil cylinder port (M2), a forward second gear oil return port (H2), an oil supply port (R2), a reverse gear oil cylinder port (M3) and a reverse gear oil return port (H3) along the axial direction, the inner wall of the gear shifting valve cavity (C1) is further provided with a reverse gear groove (P4), the oil inlet (R) is respectively communicated with the oil inlet (R1) and the oil supply port (R2), the number of the oil inlets (R1) is two, the gear shifting valve rod (S) is a solid cylinder, the valve rod (S) is sequentially provided with a gear groove (P1), an oil inlet groove (P0), a second gear groove (P2) and a reverse gear oil inlet groove (P3) along the axial direction, one end of the gear shifting valve rod (S) extends out of a gear shifting valve cavity (C1) and is sleeved with, the sealing ring is connected with the inner wall of the gear shifting valve cavity (C1), and an end cover fixedly connected with the valve body is arranged on the outer side of the sealing ring.

2. A hydraulic shift operating valve as defined in claim 1 wherein: the oil inlet channel (R) is communicated with the pressure regulating valve group (A), the brake valve group (B) and the gear shifting valve group (C) in sequence.

3. A hydraulic shift operating valve as defined in claim 2 wherein: the reverse gear groove (P4) is located on the inner wall of the left end of the gear shifting valve cavity (C1), and the reverse gear oil return port (H3) is located on the inner wall of the gear shifting valve cavity (C1).

4. A hydraulic shift operating valve as defined in claim 1 wherein: when the gear shifting valve rod (S) is in a neutral gear, the oil inlet groove (P0), the reverse gear oil inlet groove (P3) are communicated with the oil inlet path (R) on the valve body, the first gear groove (P1) is communicated with the first forward gear oil cylinder opening (M1) and the first forward gear oil return opening (H1), the second gear groove (P2) is communicated with the second forward gear oil cylinder opening (M2) and the second forward gear oil return opening (H2), and the reverse gear groove (P4) is communicated with the reverse gear oil cylinder opening (M3) and the reverse gear oil return opening (H3).

5. The hydraulic shift operating valve as recited in claim 4, further comprising: the surface of the gear shifting valve rod (S) is in close contact with the inner wall of a gear shifting valve cavity (C1), when the gear shifting valve rod (S) is in a neutral gear, a first gear groove (P1) and a first forward gear oil cylinder port (M1) form a closed space with a first forward gear oil return port (H1), an oil inlet groove (P0) and an oil inlet (R1) form a closed space, a second gear groove (P2), a second forward gear oil return port (H2) and a second forward gear oil cylinder port (M2) form a closed space, a reverse gear oil inlet groove (P3) and an oil supply port (R2) form a closed space, and a reverse gear groove (P4), a reverse gear oil return port (H3) and a reverse gear oil cylinder port form a closed space for (M3).

6. A hydraulic shift operating valve as defined in claim 5 wherein: the gear shifting valve rod (S) is provided with a plurality of small throttling grooves (W) on two sides of a first retaining groove (P1), an oil inlet groove (P0), a second retaining groove (P2), a reverse gear oil inlet groove (P3), a reverse gear groove (P4) and the gear shifting valve rod (S), the small throttling grooves (W) are formed in the intersection of the first retaining groove (P1), the oil inlet groove (P0), the second retaining groove (P2), the reverse gear oil inlet groove (P3), the reverse gear groove (P4) and the outer side face of the gear shifting valve rod (S), the small throttling grooves (W) are gradually increased towards the intersection of the first retaining groove (P1), the oil inlet groove (P2), the second retaining groove (P2), the reverse gear oil inlet groove (P3) and the reverse gear groove (P4), and the small throttling grooves (W) respectively correspond to a forward first gear oil return port (H1), an oil supply port (R6), a forward second gear port (H2), a reverse gear return port (3) and a reverse gear return port (3) respectively, A forward first gear oil cylinder opening (M1), a forward second gear oil cylinder opening (M2) and a reverse gear oil return opening (H3) are arranged.