CN218094175U - Oil inlet pressure limiting structure of speed change control valve, gearbox and operation machine - Google Patents
Oil inlet pressure limiting structure of speed change control valve, gearbox and operation machine Download PDFInfo
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- CN218094175U CN218094175U CN202222166761.7U CN202222166761U CN218094175U CN 218094175 U CN218094175 U CN 218094175U CN 202222166761 U CN202222166761 U CN 202222166761U CN 218094175 U CN218094175 U CN 218094175U
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Abstract
The utility model relates to a variable speed control valve, for solving the problem that the arrangement and installation of the existing variable speed control valve lead to high cost, the relief valve is easy to be damaged, the utility model discloses construct a variable speed control valve oil feed pressure limiting structure, gearbox and operation machinery, the valve body of the relief valve in the variable speed control valve oil feed pressure limiting structure is composed of a gearbox shell, a stepped valve cavity hole matched with the relief valve rod is arranged in the gearbox shell, the end of the small diameter section of the stepped valve cavity hole is communicated with the variable speed control valve oil feed oil duct, the gearbox shell is fixedly provided with a limiting part at the end of the large diameter section of the stepped valve cavity hole, and the front end of the valve rod is a pyramid part which can be closely matched with the step of the stepped valve cavity hole; one end of the spiral spring is connected with the rear part of the valve rod, and the other end of the spiral spring is connected with the limiting piece. The utility model discloses in, set up the relief valve on the transmission housing, simplified the structure of variable speed operating valve, reduce its cost. The safety valve is positioned inside the gearbox shell and cannot be damaged by collision.
Description
Technical Field
The utility model relates to a variable speed operating valve, more specifically say, relate to a variable speed operating valve oil feed pressure limiting structure, gearbox and operation machinery.
Background
A variable-speed operating valve is arranged on a gear box of the loader and used for controlling each clutch on the gear box to realize variable-speed control of the loader.
The existing speed change operating valve is installed on a shell of a transmission case, safety valves are arranged on some electric proportional speed change operating valves, the maximum pressure of oil inlet of the speed change operating valves is limited, and damage to gear electromagnetic valves of the electric proportional speed change operating valves due to overlarge oil pressure is prevented. The electric proportional variable speed control valve oil inlet safety valve is arranged on the valve body and is positioned in front of the oil inlet P. When the electric proportional speed-changing control valve starts oil feeding, and the oil pressure is larger than the set value of the safety valve, the safety valve is opened, and the oil overflows to the oil return hole and enters the gearbox.
The safety valve on the existing variable speed control valve is purchased as a finished product, in addition, the safety valve is returned to a long cylinder structure and is arranged on the valve body of the variable speed control valve, the valve body of the variable speed control valve is thickened, and a safety valve interface and an overflow oil duct need to be processed on the valve body of the variable speed control valve, so that the manufacturing cost is high; the safety valve is exposed on the outer surface of the gearbox and is easy to collide and lose effectiveness.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that current variable speed operating valve arranges that the installation relief valve leads to with high costs, the relief valve is bumped bad problem easily, and provides a variable speed operating valve oil feed pressure limiting structure and gearbox, simplifies the structure of variable speed operating valve, reduce cost.
The utility model discloses a realize that the technical scheme of its purpose is like: the oil inlet pressure limiting structure of the speed change control valve comprises a speed change box shell and a safety valve, wherein the safety valve comprises a valve rod and a spiral spring and is characterized in that a valve body of the safety valve is formed by the speed change box shell, a stepped valve cavity hole matched with the valve rod of the safety valve is formed in the speed change box shell, the tail end of a small-diameter section of the stepped valve cavity hole is communicated with an oil inlet oil channel of the speed change control valve, a limiting piece is fixedly arranged at the tail end of a large-diameter section of the stepped valve cavity hole of the speed change box shell, and the front end of the valve rod is a cone which can be hermetically matched with a step of the stepped valve cavity hole; one end of the spiral spring is connected with the rear portion of the valve rod, and the other end of the spiral spring is connected with the limiting piece.
The utility model discloses in, set up the relief valve in the gearbox casing, inject the oil inlet pressure of variable speed operating valve, carry out the pressure limiting protection to the variable speed operating valve. The safety valve is arranged on the shell of the transmission case, so that the structure of the transmission operating valve is simplified, and the cost is reduced. The safety valve is positioned inside the gearbox shell and cannot be damaged by collision.
The utility model discloses among the speed change control valve oil feed pressure limiting structure, the small diameter section end in echelonment valve pocket hole is located the speed change control valve installation face on the gearbox casing, the large diameter section in echelonment valve pocket hole and the inner chamber intercommunication of gearbox casing, the locating part comprises the plate valve gap of fixing through the screw at gearbox casing inboard. Further, a guide hole which is coaxial with the stepped valve cavity hole and is used for the rear end of the valve rod to slide in is arranged on the plate-shaped valve cover.
The utility model discloses among the variable speed control valve oil feed pressure limiting structure, echelonment valve pocket hole is by setting up the hole that isometric straight hole and tube-shape circle on the gearbox housing were taken constitutes, the outer face of cylinder that the tube-shape circle was taken with the wall interference fit fixed connection in isometric straight hole, the front end that the tube-shape circle was taken does not bulge variable speed control valve installation face, the hole rear end that the tube-shape circle was taken be used for with the pyramid cooperation makes the safety valve open or close.
The utility model discloses among the variable speed control valve oil feed pressure limiting structure, can also be variable speed control valve oil feed oil duct is connected the oil duct including the variable speed oil feed that sets up to be used for intercommunication speed change pump mouth and variable speed control valve oil inlet in the gearbox casing, the oil duct intercommunication is connected with the variable speed oil feed to the end of the little diameter section of echelonment valve pocket hole, the big diameter section end of echelonment valve pocket hole is located gearbox casing surface, the locating part by installing the terminal plug of the big diameter section of echelonment valve pocket hole constitutes. Furthermore, a guide blind hole which is coaxial with the stepped valve cavity hole and is used for the rear end of the valve rod to slide in is arranged on the end face, facing the valve rod, of the plug.
The utility model discloses among the variable speed control valve oil feed pressure limiting structure, the valve rod rear portion is the pole portion that the diameter is less than the pyramis, the coil spring cover is established on the pole portion.
The utility model discloses among the variable speed operating valve oil feed pressure limiting structure, the pyramis is in its maximum diameter department and the major diameter section pore wall clearance fit of echelonment valve pocket hole. Or the cone part is provided with an axial passage at the maximum diameter of the cone part, and the axial passage is axially communicated with the front side and the rear side of the maximum diameter of the cone part.
The utility model discloses a realize that the technical scheme of its purpose is like: the structure of the gearbox is characterized in that the gearbox shell is provided with the oil inlet pressure limiting structure of the speed change operating valve.
The utility model discloses a realize that the technical scheme of its purpose is like: the operating machine can be a loader, a land leveler, a forklift and the like, uses a hydraulic gear shifting gearbox, and is characterized in that the gearbox shell is provided with the oil inlet pressure limiting structure of the speed change operating valve.
Compared with the prior art, the utility model discloses in, set up the relief valve in the gearbox casing, inject the oil inlet pressure of variable speed operating valve, carry out the pressure limiting protection to the variable speed operating valve. The safety valve is arranged on the shell of the transmission case, so that the structure of the transmission operating valve is simplified, and the cost of the transmission operating valve is reduced. The safety valve is positioned inside the gearbox shell and cannot be damaged by collision.
Drawings
Fig. 1 is a schematic view of a mounting structure of a shift operating valve on a transmission according to a first embodiment of the present invention.
Fig. 2 is a cross-sectional view taken along direction D in fig. 1.
Fig. 3 is a schematic structural diagram of a valve rod according to a first embodiment of the present invention.
Fig. 4 is a schematic structural view of a plate-shaped valve cover according to a first embodiment of the present invention.
Fig. 5 is a schematic view of a mounting structure of a shift operating valve on a transmission according to a second embodiment of the present invention.
Fig. 6 is a cross-sectional view taken along the direction M in fig. 5.
Part names and serial numbers in the figure:
the variable-speed control valve comprises a variable-speed control valve 10, a variable-speed oil inlet 11, a variable-speed control valve oil inlet oil channel 12, a gearbox shell 20, a valve rod 21, a conical part 210, a rod part 2111, a conical surface 213, a maximum diameter part 214, an axial channel 214, a spiral spring 22, a plate-shaped valve cover 23, a guide hole 231, a screw 24, a cylindrical lap 25, a variable-speed control valve mounting surface 26, a stepped valve cavity hole 27, a variable-speed oil inlet connecting oil channel 28, an oil return cavity 29, a variable-speed pump 30, a fine filter 31, a pipeline 32, a plug 40 and a guide blind hole 41.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
The first embodiment.
As shown in fig. 1, a transmission case 20 of the transmission case of the present embodiment is provided with a shift operating valve attachment surface 26, and the shift operating valve 10 is fixedly attached to the shift operating valve attachment surface 26.
A speed change control valve oil inlet duct 12 is arranged in the valve body of the speed change control valve 10, a first end of the speed change control valve oil inlet duct 12 is positioned on the surface of the valve body of the speed change control valve and is used as an oil inlet 11 of the speed change control valve to be connected with a speed change control pressure oil source, and a second end of the speed change control valve oil inlet duct is positioned on the surface, matched with a speed change control valve mounting surface on a gearbox shell, of the valve body of the speed change control valve.
A safety valve is arranged in the transmission housing 20, wherein the valve body of the safety valve is formed by the transmission housing 20. As shown in fig. 2, the speed change operation valve mounting surface 26 is provided with straight holes having an equal diameter, the cylindrical round piece 25 is mounted in the straight holes having an equal diameter, an outer cylindrical surface of the cylindrical round piece 25 is fixedly connected to a wall surface of the straight hole having an equal diameter in an interference fit manner, a front end of the cylindrical round piece 25 does not protrude from the speed change operation valve mounting surface 26, and a rear end of an inner hole of the cylindrical round piece 25 is used for engaging with the valve stem 21 to open or close the relief valve.
The straight bore 201 of the same diameter and the inner bore 251 of the cylindrical lap 25 form a stepped valve cavity bore 27 in the transmission housing 20 for receiving the valve stem 21. The tail end of the small-diameter section of the stepped valve cavity hole (namely the front end of the inner hole of the cylindrical round lap 25) is located on the quick operating valve installation surface 26, and the limiting piece is fixedly installed at the tail end of the large-diameter section of the stepped valve cavity hole (namely the rear end of the equal-diameter straight hole) of the gearbox shell 20.
As shown in fig. 2 and 3, the front end of the valve rod 21 is a tapered part 210 which can be hermetically matched with the step of the stepped valve cavity hole; the rear part of the valve rod is a rod part 211 with the diameter smaller than that of the conical part, the spiral spring 22 is sleeved on the rod part 211, one end of the spiral spring 22 is connected with the rear part of the valve rod 21, and the other end of the spiral spring is connected with the limiting piece.
Taper 210 has an axial passage 215 at its maximum diameter that communicates axially between the front and rear sides of the taper at its maximum diameter. After the safety valve is opened, oil can be quickly decompressed through the taper part of the valve rod.
As shown in fig. 2 and 4, the stopper is formed by a plate-shaped valve cover 23 fixed to the inside of the transmission case by a screw, and the plate-shaped valve cover 23 is provided with a guide hole 231 coaxial with the stepped valve cavity hole and through which the rear end of the valve stem 21 slides.
As shown in fig. 2, the small diameter section of the stepped valve cavity hole 27 has a distal end communicating with the second end of the speed change control valve inlet oil passage 12 on the speed change control valve mounting surface, and the relief valve opens when the inlet pressure of the speed change control valve 10 is greater than the set pressure of the relief valve.
In the present embodiment, the safety valve is provided in the transmission case 20, and the safety valve is not provided in the valve body of the shift operating valve 10, so that the thickness of the valve body of the shift operating valve 10 is reduced, the internal oil passage structure thereof is simplified, and the cost of the valve is reduced.
In the present embodiment, the stepped valve cavity hole 27 can also be directly machined by machining under the premise of convenient machining of the transmission case, for example, when drilling is allowed from the inside of the transmission case 20 at the installation position of the shift operating valve.
The utility model also provides an embodiment of the operation machinery, this operation machinery can be loader, leveler, fork truck etc. and it uses the hydraulic pressure gearbox of shifting gears, and this gearbox is provided with aforementioned variable speed operating valve oil feed pressure limiting structure on the gearbox casing.
Example two.
As shown in fig. 5 and fig. 6, in the present embodiment, the transmission case 20 is provided with a transmission pump 30 and a transmission operating valve 10, the transmission operating valve oil inlet passage 12 includes a transmission oil inlet connecting passage 28 disposed in the transmission case 20, one end of the transmission oil inlet connecting passage 28 is connected to a pump port of the transmission pump 30, and the other end is connected to an oil inlet of the transmission operating valve 10 through a fine filter 31 and a pipeline 32.
The safety valve is arranged in the transmission housing 20, wherein the valve body of the safety valve is formed by the transmission housing 20. As shown in FIG. 6, a stepped valve cavity bore 27 is provided in the transmission housing.
The tail end of the small-diameter section of the stepped valve cavity hole 27 is communicated with the variable speed oil inlet connecting oil channel 28, and the tail end of the large-diameter section of the stepped valve cavity hole 27 is located on the surface of the gearbox shell 20. The large diameter section of the stepped valve cavity hole 27 is communicated with an oil return cavity 29, and the oil return cavity 29 is communicated with an oil return port of an inner cavity of the gearbox.
The limiting member is composed of a plug 40 arranged at the tail end of the large-diameter section of the stepped valve cavity hole 27. The end face of the plug 40 facing the valve rod is provided with a blind guide hole 41 which is coaxial with the stepped valve cavity hole and is used for the rear end of the valve rod to slide in.
In this example, the safety valve is provided in the transmission case, so that the safety valve is not provided in the valve body of the shift operating valve, thereby reducing the thickness of the valve body of the shift operating valve, simplifying the internal oil passage structure thereof, and reducing the cost of the valve.
Claims (10)
1. A speed change control valve oil inlet pressure limiting structure comprises a speed change box shell and a safety valve, wherein the safety valve comprises a valve rod and a spiral spring and is characterized in that a valve body of the safety valve is formed by the speed change box shell, a stepped valve cavity hole matched with the valve rod of the safety valve is formed in the speed change box shell, the tail end of a small-diameter section of the stepped valve cavity hole is communicated with an oil inlet oil channel of the speed change control valve, a limiting piece is fixedly installed at the tail end of a large-diameter section of the stepped valve cavity hole of the speed change box shell, and the front end of the valve rod is a cone which can be hermetically matched with a step of the stepped valve cavity hole; one end of the spiral spring is connected with the rear part of the valve rod, and the other end of the spiral spring is connected with the limiting piece.
2. The oil inlet pressure limiting structure of the speed change operating valve according to claim 1, wherein the tail end of the small diameter section of the stepped valve cavity hole is located on a speed change operating valve mounting surface on a gearbox shell, the large diameter section of the stepped valve cavity hole is communicated with an inner cavity of the gearbox shell, and the limiting member is formed by a plate-shaped valve cover fixed on the inner side of the gearbox shell through screws.
3. The oil inlet pressure limiting structure of the variable speed control valve according to claim 2, wherein a guide hole is formed in the plate-shaped valve cover, is coaxial with the stepped valve cavity hole, and is used for allowing the rear end of the valve rod to slide in the guide hole.
4. The oil inlet pressure limiting structure of the variable speed control valve according to claim 2, wherein the stepped valve cavity hole is formed by an equal-diameter straight hole and an inner hole of a cylindrical round lap which are arranged on the gearbox shell, an outer cylindrical surface of the cylindrical round lap is fixedly connected with a wall surface of the equal-diameter straight hole in an interference fit manner, the front end of the cylindrical round lap does not protrude out of a variable speed control valve mounting surface, and the rear end of the inner hole of the cylindrical round lap is used for being matched with the conical part to enable the safety valve to be opened or closed.
5. The variable speed control valve oil inlet pressure limiting structure according to claim 1, wherein the variable speed control valve oil inlet oil passage comprises a variable speed oil inlet connecting oil passage arranged in the transmission case and used for communicating a variable speed pump port with a variable speed control valve oil inlet, the tail end of the small diameter section of the stepped valve cavity hole is communicated with the variable speed oil inlet connecting oil passage, the tail end of the large diameter section of the stepped valve cavity hole is located on the surface of the transmission case, and the limiting member is composed of a plug installed at the tail end of the large diameter section of the stepped valve cavity hole.
6. The oil inlet pressure limiting structure of the variable speed control valve according to claim 5, wherein a blind guide hole which is coaxial with the stepped valve cavity hole and is used for the rear end of the valve rod to slide in is arranged on the end surface of the plug facing the valve rod.
7. The oil inlet pressure limiting structure of the variable speed operating valve as defined in claim 3 or 6, wherein the rear part of the valve stem is a stem part with a diameter smaller than that of the tapered part, and the spiral spring is sleeved on the stem part.
8. The oil inlet pressure limiting structure of the variable speed control valve according to claim 1, wherein the taper portion is in clearance fit with the wall of the large diameter section of the stepped valve cavity hole at the maximum diameter position of the taper portion; or the cone part is provided with an axial passage at the maximum diameter of the cone part, and the axial passage is axially communicated with the front side and the rear side of the maximum diameter of the cone part.
9. A gearbox, install the gear shift operating valve on the gearbox casing, characterized by that is provided with the gear shift operating valve oil feed pressure limiting structure of any one of claims 1 to 8 on the gearbox casing.
10. A work machine characterized by a gearbox according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222166761.7U CN218094175U (en) | 2022-08-17 | 2022-08-17 | Oil inlet pressure limiting structure of speed change control valve, gearbox and operation machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222166761.7U CN218094175U (en) | 2022-08-17 | 2022-08-17 | Oil inlet pressure limiting structure of speed change control valve, gearbox and operation machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218094175U true CN218094175U (en) | 2022-12-20 |
Family
ID=84445999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222166761.7U Active CN218094175U (en) | 2022-08-17 | 2022-08-17 | Oil inlet pressure limiting structure of speed change control valve, gearbox and operation machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218094175U (en) |
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2022
- 2022-08-17 CN CN202222166761.7U patent/CN218094175U/en active Active
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