CN213598032U - Plunger type pressure limiting valve - Google Patents
Plunger type pressure limiting valve Download PDFInfo
- Publication number
- CN213598032U CN213598032U CN202022604343.2U CN202022604343U CN213598032U CN 213598032 U CN213598032 U CN 213598032U CN 202022604343 U CN202022604343 U CN 202022604343U CN 213598032 U CN213598032 U CN 213598032U
- Authority
- CN
- China
- Prior art keywords
- hole
- oil
- plunger
- valve
- diameter section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a plunger type pressure limiting valve, which comprises a valve body, a plunger, a spring, a sealing ring and a plug screw; the valve body is provided with a valve hole, a first oil inlet hole, an oil drainage hole and a second oil inlet hole which are communicated with the valve hole; the plunger piston comprises a large-diameter section and a small-diameter section, the large-diameter section is in clearance fit with the valve hole, the small-diameter section penetrates through the spring and then is inserted into the sealing ring and is in clearance fit with the inner hole of the sealing ring, and the peripheral surface of the sealing ring is in transition fit with the valve hole; the screw plug comprises an outer section and an inner section, the outer section is provided with external threads, the inner section is provided with a radial oil through hole, the end surface of the inner end of the screw plug is provided with an axial blind hole, and the blind hole is intersected with the oil through hole; the first oil inlet hole is communicated with the inner side end of the valve hole, the oil drainage hole corresponds to the circumferential surface of the large-diameter section of the plunger, the second oil inlet hole corresponds to the inner side section of the plug screw, and a gap is formed between the inner side section and the inner wall of the valve hole; the first oil inlet hole and the second oil inlet hole are both used for connecting high-pressure oil. The utility model discloses can avoid the pressure-limiting valve to open in advance under high rotational speed.
Description
Technical Field
The utility model relates to an internal-combustion engine lubricating system relates to a plunger type pressure limiting valve for oil pump particularly.
Background
The conventional engine oil pump widely uses a constant delivery pump, the flow provided by the constant delivery pump along with the increase of the rotating speed of the engine can also increase, but the lubricating and cooling oil required by the engine exceeding a certain rotating speed during the operation of the engine does not change greatly, redundant engine oil provided by the constant delivery pump must be discharged in time, otherwise, the excessive engine oil pressure can damage an engine sealing element, redundant unnecessary resistance can be generated to the operation of the engine, and the working efficiency of the engine is reduced.
The traditional engine oil pump can arrange a pressure limiting valve on the oil pump to limit the pumping pressure of engine oil, but the oil pump has pressure fluctuation during working, the pressure fluctuation can be gradually increased along with the increase of the rotating speed, the frequency can be accelerated, and the pressure limiting valve is subjected to redundant impact, so that the pressure limiting valve is opened in advance at a high rotating speed. Therefore, the opening pressure of the traditional pressure limiting valve is regulated to be opened at a certain rotating speed when being calibrated, so that the opening pressure is higher than a calibrated value when the rotating speed is low, and the opening pressure is lower than the calibrated value when the rotating speed is high, thereby being very unfavorable for the management of the engine oil pressure of an engine. In order to better manage the oil pressure, a variable displacement oil pump is adopted in part of middle-high-end engines at present, the variable displacement oil pump can change the displacement of the oil pump through an ECU according to the oil pressure feedback of an oil duct, and the pumping flow and pressure of the oil pump are accurately controlled, so that the lubricating and cooling requirements of the engine are ensured, the energy consumption can be reduced through the variable displacement, but the variable displacement oil pump is complex in structure, high in cost and difficult to popularize in a large scale.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a plunger type pressure limiting valve avoids the pressure limiting valve to open under high rotational speed in advance.
In order to achieve the above purpose, the technical scheme of the utility model is that: a plunger type pressure limiting valve comprises a valve body, a plunger, a spring, a sealing ring and a plug screw; the valve body is provided with a valve hole for accommodating the plunger, the spring, the sealing ring and the screw plug, and is also provided with a first oil inlet hole, an oil drainage hole and a second oil inlet hole which are communicated with the valve hole; the plunger is a stepped shaft and comprises a large-diameter section and a small-diameter section, the large-diameter section is in clearance fit with the inner wall of the valve hole, the small-diameter section penetrates through the spring and then is inserted into the sealing ring, the inner hole of the sealing ring is in clearance fit with the small-diameter section, and the outer peripheral surface of the sealing ring is in transition fit with the valve hole; the screw plug comprises an outer side section and an inner side section, wherein the outer side section is provided with an external thread, the inner side section is provided with a radial oil through hole, the end surface of the inner side end of the screw plug is provided with an axial blind hole, and the blind hole is intersected with the oil through hole; the first oil inlet hole is communicated with the inner side end of the valve hole, the opening position of the oil drainage hole corresponds to the circumferential surface of the large-diameter section, the opening position of the second oil inlet hole corresponds to the inner side section of the screw plug, and a gap is formed between the inner side section and the inner wall of the valve hole; the first oil inlet hole and the second oil inlet hole are both used for connecting high-pressure oil.
The working principle of the technical scheme is as follows: when the oil pump works to reach the pressure limiting valve calibration opening pressure, high-pressure oil from the oil pump high-pressure cavity can push the plunger to compress the spring and move towards the spring side, when the end face of the large-diameter section moves to the position of the oil drainage hole, the pressure limiting valve enters an opening mode, and part of high-pressure oil in the oil pump high-pressure cavity can be drained to the oil pan through the oil drainage hole, so that the main oil duct of the engine is kept at the pressure limiting valve calibration opening pressure. Because the plunger includes big footpath section and path section, will form two big one little plunger terminal surfaces like this, the high-pressure oil content that comes in from first inlet port and second inlet port acts on two plunger terminal surfaces respectively, and the oil pressure effort that big plunger terminal surface received is certainly greater than little plunger terminal surface. According to a pressure calculation formula: and P is equal to F/S, the end surface of the large plunger is stressed to be larger than F, P is larger than S, the end surface of the small plunger is stressed to be smaller than F, P is smaller than S, and the compression force of the spring is F ', and F is larger than F and smaller than + F'. The spring force F 'is linearly increased along with the spring pressure, and the end faces of the two plungers are subjected to the action of high-pressure oil, so that the pressure fluctuation is consistent, and the pressure fluctuation is increased along with the increase of the rotating speed, and the F is small and the plus F' is also increased in a non-linear mode. Therefore, the condition that the lower limit valve is opened in advance at a high rotating speed can be greatly improved, the opening pressure of the lower limit valve is infinitely reduced along with the change of the rotating speed, and the oil outlet of the oil pump is always kept at constant pressure for oil supply, so that the output flow and the pressure of the oil pump can be accurately controlled, the lubricating and cooling requirements of an engine can be met, and the energy consumption can be reduced.
In one embodiment, the valve hole is sequentially provided with a plunger, a spring, a sealing ring and a screw plug from inside to outside, and the end surface of the large-diameter section corresponds to the first oil inlet hole.
In one embodiment, the seal ring and the plug are integrally formed.
Furthermore, a damping hole is formed in the valve body corresponding to the spring. In the actual working process, a small amount of high-pressure oil acting on the two ends of the plunger can leak to the middle part of the valve hole from the gap between the large-diameter section and the valve hole and the gap between the small-diameter section and the inner hole of the sealing ring, and the existence of the damping hole can discharge the oil in time, so that the damping formed between the plunger and the sealing ring is avoided, and the opening pressure of the pressure limiting valve is not influenced.
Further, the circumferential surface of the large-diameter section is provided with an annular chip-containing pressure balance groove.
Furthermore, the end face of the end, connected with the small diameter section, of the large diameter section is provided with an annular spring mounting sinking groove.
The utility model discloses the beneficial effect who gains is: the utility model provides a big or small both ends face that pressure limiting valve can introduce high-pressure oil simultaneous action plunger lets the compressive force of spring side also for nonlinear increase, can restrain the phenomenon that the low pressure valve opened in advance under the high rotational speed state like this to let the constant delivery pump also possess the ability of stable control main oil gallery pressure under different rotational speed conditions, and simple structure is reliable, and the cost advantage is obvious.
Drawings
Fig. 1 is a schematic view of the overall structure of a pressure limiting valve in embodiments 1 and 2 of the present invention;
fig. 2 is a schematic diagram of a plunger structure of a pressure limiting valve in embodiments 1 and 2 of the present invention;
fig. 3 is a schematic view of a plug screw structure of the pressure limiting valve in embodiment 1 of the present invention;
fig. 4 is an explosion schematic view of the whole structure of the pressure limiting valve in embodiment 1 of the present invention;
the reference signs are:
1-valve body 11-first oil inlet hole 12-oil drain hole
13-second oil inlet 14-damping hole
2-plunger 21-large diameter section 22-small diameter section
23-chip holding pressure balancing groove 24-spring mounting sink groove
3-spring 4-sealing ring 5-screw plug
51, external thread 52, oil through hole 53 and a blind hole.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations and positional relationships illustrated in the drawings, which are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.
Example 1
A plunger type pressure limiting valve as shown in fig. 1 to 4, which comprises a valve body 1, a plunger 2, a spring 3, a sealing ring 4 and a screw plug 5; the valve body 1 is provided with a valve hole, and is provided with a first oil inlet hole 11, an oil drainage hole 12, a second oil inlet hole 13 and a damping hole 14 which are communicated with the valve hole, and the valve hole is sequentially provided with a plunger 2, a spring 3, a sealing ring 4 and a screw plug 5 from inside to outside; the plunger 2 is a stepped shaft and comprises a large-diameter section 21 and a small-diameter section 22, the large-diameter section 21 is in clearance fit with the inner wall of the valve hole, the small-diameter section 22 penetrates through the spring 3 and then is inserted into the sealing ring 4, the inner hole of the sealing ring 4 is in clearance fit with the small-diameter section 22, and the outer peripheral surface of the sealing ring 4 is in transition fit with the inner wall of the valve hole; the screw plug 5 comprises an outer section and an inner section, wherein the outer section is provided with an external thread 51, the inner section is provided with a radial oil through hole 52, the end surface of the inner end of the screw plug 5 is provided with an axial blind hole 53, and the blind hole 53 is intersected with the oil through hole 52; the first oil inlet hole 11 is communicated with the inner side end of the valve hole and corresponds to the end face of the large-diameter section 21, the oil drain hole 12 is arranged at a position corresponding to the peripheral surface of the large-diameter section 21, the second oil inlet hole 13 is arranged at a position corresponding to the inner side section of the screw plug 5, a gap is formed between the inner side section and the inner wall of the valve hole, and the position of the damping hole 14 corresponds to the installation position of the spring 3; the first oil inlet hole 11 and the second oil inlet hole 13 are used for accessing high-pressure oil; the circumferential surface of the large-diameter section 21 is provided with an annular chip-containing pressure balance groove 23, and the end surface of the end, connected with the small-diameter section 22, of the large-diameter section 21 is provided with an annular spring mounting sinking groove 24.
The working principle of the embodiment is as follows: when the oil pump works to reach the pressure limiting valve calibration opening pressure, high-pressure oil from the oil pump high-pressure cavity can push the plunger 2 to compress the spring 3 and move towards the spring side, when the end face of the large-diameter section 21 moves to the position of the oil drainage hole 12, the pressure limiting valve enters an opening mode, and part of high-pressure oil in the oil pump high-pressure cavity can be drained to an oil pan through the oil drainage hole 12, so that an engine main oil gallery is kept at the pressure limiting valve calibration opening pressure. Because the plunger comprises the large-diameter section 21 and the small-diameter section 22, two plunger end faces, namely a large plunger end face and a small plunger end face, are formed, high-pressure oil entering from the first oil inlet hole 11 and the second oil inlet hole 13 respectively acts on the two plunger end faces, and the oil pressure acting force on the large plunger end face is inevitably larger than that on the small plunger end face. According to a pressure calculation formula: and P is equal to F/S, the end surface of the large plunger is stressed to be larger than F, P is larger than S, the end surface of the small plunger is stressed to be smaller than F, P is smaller than S, and the compression force of the spring is F ', and F is larger than F and smaller than + F'. The spring force F 'is linearly increased along with the spring pressure, and the end faces of the two plungers are subjected to the action of high-pressure oil, so that the pressure fluctuation is consistent, and the pressure fluctuation is increased along with the increase of the rotating speed, and the F is small and the plus F' is also increased in a non-linear mode. Therefore, the condition that the lower limit valve is opened in advance at a high rotating speed can be greatly improved, the opening pressure of the lower limit valve is infinitely reduced along with the change of the rotating speed, and the oil outlet of the oil pump is always kept at constant pressure for oil supply, so that the output flow and the pressure of the oil pump can be accurately controlled, the lubricating and cooling requirements of an engine can be met, and the energy consumption can be reduced. In the working process, a small amount of high-pressure oil acting on two ends of the plunger leaks to the middle part of the valve hole from a gap between the large-diameter section 21 and the valve hole and a gap between the small-diameter section 22 and an inner hole of the sealing ring 4, and the existence of the damping hole 14 can discharge the oil in time, so that the damping formed between the plunger and the sealing ring 4 is avoided, and the opening pressure of the pressure limiting valve is not influenced.
Example 2
The whole structure of this embodiment is basically the same as that of embodiment 1, except that the seal ring 4 and the plug screw 5 are integrally formed.
The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.
In order to make it easier for those skilled in the art to understand the improvement of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and in order to clarify, some other elements have been omitted from this document, those skilled in the art should recognize that these omitted elements may also constitute the content of the present invention.
Claims (6)
1. A plunger-type pressure limiting valve characterized by: comprises a valve body (1), a plunger (2), a spring (3), a sealing ring (4) and a plug screw (5); the valve body (1) is provided with a valve hole for accommodating the plunger (2), the spring (3), the sealing ring (4) and the screw plug (5), and is also provided with a first oil inlet hole (11), an oil drainage hole (12) and a second oil inlet hole (13) which are communicated with the valve hole; the plunger (2) is a stepped shaft and comprises a large-diameter section (21) and a small-diameter section (22), the large-diameter section (21) is in clearance fit with the inner wall of the valve hole, the small-diameter section (22) penetrates through the spring (3) and then is inserted into the sealing ring (4), the inner hole of the sealing ring (4) is in clearance fit with the small-diameter section (22), and the peripheral surface of the sealing ring (4) is in transition fit with the inner wall of the valve hole; the screw plug (5) comprises an outer section and an inner section, wherein the outer section is provided with an external thread (51), the inner section is provided with a radial oil through hole (52), the end surface of the inner end of the screw plug (5) is provided with an axial blind hole (53), and the blind hole (53) is intersected with the oil through hole (52); the first oil inlet hole (11) is communicated with the inner side end of the valve hole, the oil drain hole (12) is arranged at a position corresponding to the circumferential surface of the large-diameter section (21), the second oil inlet hole (13) is arranged at a position corresponding to the inner side section of the screw plug (5), and a gap is formed between the inner side section and the inner wall of the valve hole; the first oil inlet hole (11) and the second oil inlet hole (13) are used for connecting high-pressure oil.
2. A plunger pressure limiting valve according to claim 1, characterized in that: the valve hole is equipped with plunger (2), spring (3), sealing ring (4), plug screw (5) from inside to outside in proper order, the terminal surface of major diameter section (21) corresponds with first inlet port (11).
3. A plunger pressure limiting valve according to claim 2, characterized in that: the sealing ring (4) and the screw plug (5) are integrally formed.
4. A plunger pressure limiting valve according to any of claims 1 to 3, characterized in that: and a damping hole (14) is also formed in the valve body (1) corresponding to the spring (3).
5. A plunger pressure limiting valve according to any of claims 1 to 3, characterized in that: the circumferential surface of the large-diameter section (21) is provided with an annular chip-containing pressure balance groove (23).
6. A plunger pressure limiting valve according to any of claims 1 to 3, characterized in that: the end face of one end, connected with the small diameter section, of the large diameter section (21) is provided with an annular spring mounting sinking groove (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022604343.2U CN213598032U (en) | 2020-11-12 | 2020-11-12 | Plunger type pressure limiting valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022604343.2U CN213598032U (en) | 2020-11-12 | 2020-11-12 | Plunger type pressure limiting valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213598032U true CN213598032U (en) | 2021-07-02 |
Family
ID=76595495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022604343.2U Active CN213598032U (en) | 2020-11-12 | 2020-11-12 | Plunger type pressure limiting valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213598032U (en) |
-
2020
- 2020-11-12 CN CN202022604343.2U patent/CN213598032U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101892981B (en) | variable capacity lubricant vane pump | |
| CN110318836A (en) | A kind of radial loop energy-saving machine oil control valve | |
| CN100392256C (en) | Hydraulic system oil tank liquid low-pressure supercharging device | |
| KR20030010631A (en) | Regulated pump | |
| CN103080545A (en) | Device for throttling a fluid flow, and corresponding piston pump for delivering fluids | |
| CN213598032U (en) | Plunger type pressure limiting valve | |
| CN112177706A (en) | Plunger type pressure limiting valve | |
| CN205207804U (en) | A unilateral control valve for plunger pump | |
| CN101718361B (en) | Constant-pressure check valve | |
| JP6161821B2 (en) | Method for manufacturing pressure limiting valve, pressure limiting valve, and member for fuel injection system | |
| CN106678034A (en) | Multistage liquid control anti-cavitation and anti-shock valve plate | |
| JP3900390B2 (en) | Fuel supply device | |
| CN103644039B (en) | Engine motor oil pressure limiting pressure release oil return system | |
| CN110185911A (en) | A kind of engine oil pump pressure-limiting valve preventing plunger eccentric wear | |
| CN104100825B (en) | Displacement-variable oil pump | |
| CN215486200U (en) | Filter assembly adopting plunger type pressure regulating valve | |
| CN101460705B (en) | Compressor device and method for remaking compressor or redesigning compressing device | |
| CN104373269A (en) | Return oil system of high-pressure common rail pump | |
| CN210623569U (en) | Reciprocating type magnetic liquid combined sealing device | |
| CN205978384U (en) | Can avoid transmission oil way hypertonia's transmission oil pump | |
| CN111946685A (en) | Structure of direct-acting overload oil replenishing valve | |
| CN110159778A (en) | A kind of pressure limiting valve plunger and the engine oil pump pressure-limiting valve for avoiding pressure oscillation | |
| CN201582452U (en) | Constant pressure check valve | |
| CN216008893U (en) | Double-volume type pump set | |
| CN105317602A (en) | External fuel pump assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |