A variable displacement oil pump slider control mechanism

Abstract

A variable displacement oil pump slider control mechanism relates to the technical field of variable displacement oil pumps. It includes a slider for being arranged in a rotor cavity and a pilot valve for being connected to one side of the rotor cavity. One side of the slider is fixedly connected with a slider arm. The pilot valve includes a valve hole and a valve core arranged in the valve hole and movable therein. The valve hole includes a front valve hole part, a middle valve hole part, and a rear valve hole part. The valve core is located between the front valve hole part and the middle valve hole part and separates the front valve hole part from the middle valve hole part. The middle valve hole part is provided with a first oil inlet hole. A compression spring is arranged in the front valve hole part. The front and rear ends of the compression spring respectively abut against the front end of the valve hole and the valve core. The valve core is fixedly connected with a connecting rod. The front end of the connecting rod passes through the front end of the valve hole and is movably connected with the slider arm. The present invention uses the connecting rod to push the slider to swing, so as to accelerate the control reaction time, reduce the design difficulty, and simplify the sealing structure.

Description

Technical Field

[0001] The present invention relates to the technical field of variable displacement oil pumps, and particularly to a slider control mechanism for a variable displacement oil pump. Background Art

[0002] With the increasing development of automotive energy conservation and emission reduction technologies, variable displacement oil pumps have been widely used in internal combustion engine lubrication systems. Existing variable displacement oil pumps usually have a movable slider disposed in an oil chamber, and the feedback oil enters the feedback oil chamber to push the slider to swing, thereby changing the displacement of the pump. The disadvantage of this slider control method is that it takes a relatively long reaction time for the feedback oil to enter the feedback oil chamber and push the slider to swing, and in order to prevent the oil in the feedback oil chamber from entering the rotor chamber, a relatively complex sealing structure needs to be designed. Moreover, since a spring needs to be provided on one side of the slider to resist the slider, it is also troublesome to calculate the corresponding elastic coefficient specifications required for the slider. Summary of the Invention

[0003] The purpose of the present invention is to provide a slider control mechanism for a variable displacement oil pump, which uses a connecting rod to push the slider to swing, so as to accelerate the control reaction time, reduce the design difficulty, and simplify the sealing structure.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: A slider control mechanism for a variable displacement oil pump includes a slider for being disposed in a rotor chamber and a pilot valve for being connected to one side of the rotor chamber. One side of the slider is fixedly connected with a slider arm. The pilot valve includes a valve hole and a valve core disposed in the valve hole and movable. The valve hole includes a front valve hole portion, a middle valve hole portion, and a rear valve hole portion. The valve core is located between the front valve hole portion and the middle valve hole portion and separates the front valve hole portion from the middle valve hole portion. The middle valve hole portion is provided with a first oil inlet hole. A compression spring is disposed in the front valve hole portion, and the front and rear ends of the compression spring respectively abut against the front end of the valve hole and the valve core. The valve core is fixedly connected with a connecting rod. The front end of the connecting rod passes through the front end of the valve hole and is movably connected with the slider arm. The compression spring can push the valve core, so that the connecting rod drives the slider arm to abut against the inner wall of the rotor chamber. The oil entering from the first oil inlet hole can push the valve core, so that the connecting rod pushes the slider arm and drives the slider to swing to achieve a change in displacement.

[0005] Further, the rear valve hole portion is provided with a plug and a bushing installed at the front end of the plug. The front end of the bushing is provided with a jack. The rear end of the connecting rod passes through the valve core and is inserted into the jack.

[0006] Wherein, a second oil inlet hole controlled by an electromagnetic valve to open and close is provided at the rear portion of the bushing. The second oil inlet hole communicates with the jack. The oil entering from the second oil inlet hole can enter the jack and push the connecting rod from the rear end of the connecting rod.

[0007] Further, a chute is formed in the slider arm, and a transmission pin capable of sliding along the chute is arranged in the chute. One end of the transmission pin extends outwards from the chute and is movably connected to the connecting rod.

[0008] Furthermore, an installation hole for sleeving the transmission pin is formed at the front end of the connecting rod. A limiting protrusion for preventing the transmission pin from separating from the connecting rod is arranged on the outer wall surface of the transmission pin, and the limiting protrusion is located between the chute notch and the connecting rod.

[0009] Preferably, the limiting protrusion is a clamping ring structure annularly arranged on the outer wall of the connecting rod.

[0010] More preferably, a connecting portion with a rectangular longitudinal section is arranged at the front end of the connecting rod. The thickness of the connecting portion is smaller than the diameter of the connecting rod, and the installation hole is arranged on the connecting portion.

[0011] The working principle of the present invention is as follows: When the engine oil gradually enters from the first oil inlet hole of the pilot valve, the valve core can be pushed to move in the direction of the front end of the valve hole, and then the connecting rod can be pushed forward to drive the slider arm, so that the slider swings, realizing the change of the displacement of the oil pump.

[0012] Compared with the traditional structure that uses the feedback oil to enter the feedback oil cavity to drive the slider to swing, driving the slider to swing through the control mechanism of the present invention can accelerate the control response time. And since there is no need to arrange a spring on one side of the slider arm and no need to arrange a feedback oil cavity on the other side, the design difficulty of the variable displacement oil pump is significantly reduced, and the sealing structure can also be effectively simplified. Description of the Drawings

[0013] Figure 1 is a schematic cross-sectional view of the overall structure in the embodiment of the present invention

[0014] Figure 2 is a schematic view of the partial structure in the embodiment;

[0015] Figure 3 is Figure 1 a schematic cross-sectional view of the structure at A-A in

[0016] Reference numerals are:

[0017] 1 - slider, 1a - slider arm, 2 - pilot valve

[0018] 2a - front valve hole part, 2b - middle valve hole part, 2c - rear valve hole part

[0019] 3 - valve core, 4 - compression spring, 5 - connecting rod

[0020] 5a - connecting portion, 6 - chute, 7 - transmission pin

[0021] 7a - Limit projection; 8a - First oil inlet hole; 8b - Second oil inlet hole

[0022] 9 - Plug; 10 - Bushing; 11 - Socket hole. Detailed implementation manner

[0023] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with embodiments and drawings. The content mentioned in the implementation manner does not limit the present invention.

[0024] It should be noted in advance that in the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] In addition, in the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the first feature is at a lower horizontal height than the second feature. The orientation or positional relationship indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0026] Such as Figures 1-3As shown in the figure, a variable displacement oil pump slider control mechanism includes a slider 1 arranged in a rotor chamber and a pilot valve 2 connected to one side of the rotor chamber. One side of the slider 1 is fixedly connected with a slider arm 1a. The pilot valve 2 includes a valve hole and a valve core 3 arranged in the valve hole and movable. The valve hole includes a front valve hole part 2a, a middle valve hole part 2b, and a rear valve hole part 2c. The valve core 3 is located between the front valve hole part 2a and the middle valve hole part 2b and separates the front valve hole part 2a and the middle valve hole part 2b from each other. A first oil inlet hole 8a is provided in the middle valve hole part 2a. A compression spring 4 is arranged in the front valve hole part 2a. The front and rear ends of the compression spring 4 respectively abut against the front end of the valve hole and the valve core 3. The valve core 3 is fixedly connected with a connecting rod 5. The front end of the connecting rod 5 passes through the front end of the valve hole and is movably connected with the slider arm 1a. The compression spring 4 can push against the valve core 3, so that the connecting rod 5 drives the slider arm 1a to abut against the inner wall of the rotor chamber. The oil entering from the first oil inlet hole 8a can push the valve core 3, so that the connecting rod 5 pushes the slider arm 1a and drives the slider 1 to swing to achieve the change of displacement.

[0027] After the variable displacement oil pump slider control mechanism provided by the above embodiment is applied to a variable displacement oil pump, it can replace the traditional method of using feedback oil to enter the feedback oil chamber to drive the slider to swing and obtain better results. Specifically, when the variable displacement oil pump does not need to change the displacement during normal operation, since too much oil will not enter the middle valve hole part 2b, the valve core 3 will move in the direction of the rear end of the valve hole under the elastic force of the compression spring 4, and the connecting rod 5 will drive the slider arm 1a to abut against the inner wall surface of the pump body oil chamber. When it is necessary to change the displacement, the system oil pressure changes, and more oil will enter the first oil inlet hole 8a from the external feedback oil passage and pour into the middle valve hole part 2b to push the valve core 3 to move in the direction of the front end of the valve hole, further compressing the compression spring 4. At the same time, the connecting rod 5 is pushed forward to drive the slider arm 1a, and then the slider 1 swings to achieve the change of the oil pump displacement. Compared with the traditional structure that uses feedback oil to enter the feedback oil chamber to push the slider to swing, driving the slider 1 to swing through the control mechanism of the present invention can accelerate the control response time, and since there is no need to set a spring on one side of the slider arm 1a and there is no need to set a feedback oil chamber on the other side, the design difficulty of the variable displacement oil pump is significantly reduced, and the sealing structure can also be effectively simplified.

[0028] It should be noted that in the above-described embodiment, a through hole for the front end of the connecting rod 5 to pass through is provided at the front end of the valve hole. The through hole and the connecting rod 5 can be in clearance fit, and there is no need to provide a sealing structure. Therefore, in fact, the front side of the slider arm 1a (the oil inlet chamber of the oil pump), the rear side of the slider arm 1a, the clearance between the through hole and the connecting rod 5, and the front valve hole portion 2a are interconnected. On the one hand, it can provide a lubricating effect for the movement of the connecting rod 5 in the through hole. On the other hand, those skilled in the art should know that the amount of oil leaking from the clearance between the through hole and the connecting rod 5 to the front valve hole portion 2a is actually not much, and this amount of oil will return to the pump body oil chamber again after the valve core 3 moves forward. Therefore, it will not affect the operation of the mechanism inside the pilot valve 2.

[0029] Furthermore, a plug 9 and a bushing 10 installed at the front end of the plug 9 are provided in the rear valve hole portion 2c in the above-described embodiment. A jack 11 is provided at the front end of the bushing 10. The rear end of the connecting rod 5 passes through the valve core 3 and is inserted into the jack 11. The presence of the jack 11 can further improve the positioning and guiding function of the connecting rod 5, making the operation of the control mechanism more stable and smooth.

[0030] On this basis, a second oil inlet hole 8b controlled by an electromagnetic valve to open and close can also be provided at the rear part of the bushing 10. The second oil inlet hole 8b communicates with the jack 11. In this way, the engine oil entering from the second oil inlet hole 8b can enter the jack 11 and push the connecting rod 5 from the rear end of the connecting rod 5. By providing the second oil inlet hole 8b controlled by an electromagnetic valve to open and close, the control mechanism can be applied to a two-stage variable displacement oil pump. The specific working principle is that the first oil inlet hole 8a is always in communication with the external feedback oil passage, while the second oil inlet hole 8b can be controlled by the electromagnetic valve to open and close. When low-pressure stage variable is required, the second oil inlet hole 8b is opened. At this time, both the first oil inlet hole 8a and the second oil inlet hole 8b can admit oil, making the acting area of the oil fluid the largest (the total area of the annular rear end face of the valve core 3 plus the rear end face of the connecting rod 5). When the pressure reaches the set value, that is, the force received by the whole formed by the valve core 3 and the connecting rod 5 is greater than the pressure of the compression spring 4, the valve core 3 and the connecting rod 5 move in the direction of the front end of the valve hole, and then the connecting rod 5 pushes the slider arm 1a to realize the swing of the slider 1, achieving the purpose of changing the displacement of the oil pump; when high-pressure stage variable is required, the second oil inlet hole 8b is closed. At this time, only the first oil inlet hole 8a can admit oil, making the acting area of the oil fluid only the area of the annular rear end face of the valve core 3 (becoming smaller compared to the oil pressure acting area during low-pressure stage variable). In this way, when the pressure reaches the highest pressure value, the oil fluid will push the valve core 3 to move in the direction of the front end of the valve hole, and then the connecting rod 5 pushes the slider arm 1a to realize the swing of the slider 1, achieving the purpose of changing the displacement of the oil pump.

[0031] Those skilled in the art should know that the method of controlling the opening and closing of the second oil inlet hole 8b by means of a solenoid valve belongs to the conventional technical means in the prior art. Therefore, the structure of the solenoid valve will not be specifically described and limited.

[0032] Furthermore, a chute 6 is formed on the slider arm 1a, and a transmission pin 7 that can slide along the chute 6 is arranged in the chute 6. One end of the transmission pin 7 extends out of the chute 6 and is movably connected to the connecting rod 5. Since the movement of the connecting rod 5 is a reciprocating movement in a straight line direction, while the movement of the slider 1 is in a swinging manner, by providing the chute 6, the reciprocating movement of the connecting rod 5 can easily push the transmission pin 7 to move along the chute 6, thereby driving the slider 1 to swing.

[0033] On the above basis, the height of the slider arm 1a can be designed to be less than the height of the slider 1 (defining the height of the slider 1 in the axial direction of the slider 1), so that the chute 6 can be directly arranged on the upper end surface of the slider arm 1a, which is convenient for the connecting rod 5 to be assembled and connected above the slider arm 1a.

[0034] Preferably, the specific connection structure between the connecting rod 5 and the transmission pin 7 can be that an installation hole for sleeving the transmission pin 7 is formed at the front end of the connecting rod 5, and a limiting protrusion 7a for preventing it from separating from the connecting rod 5 is arranged on the outer wall surface of the transmission pin 7. The limiting protrusion 7a is located between the notch of the chute 6 and the connecting rod 5. Among them, the limiting protrusion 7a is a ring-shaped clamping structure arranged on the outer wall of the connecting rod 5.

[0035] As a more preferred embodiment, as Figure 3 shown, a connecting portion 5a with a rectangular longitudinal section is provided at the front end of the connecting rod 5. The thickness of the connecting portion 5a is less than the diameter of the connecting rod 5. The installation hole is arranged on the connecting portion 5a. By designing the connecting portion 5a, the structure at the connection between the connecting rod 5 and the slider arm 1a can be made more compact.

[0036] In addition, in order to facilitate the assembly of the control mechanism, the connecting rod 5 can also be designed into a detachable front rod portion and a rear rod portion. After connecting the front rod portion with the transmission pin 7, it is then inserted rearward into the valve hole, and the valve core 3 can be fixed on the rear rod portion. Then, the rear rod portion is inserted into the valve hole from the rear end and threadedly connected to the front rod portion.

[0037] The above embodiments are the preferred implementation solutions of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution of the present invention is within the protection scope of the present invention.

[0038] To enable those of ordinary skill in the art to more easily understand the improvements of the present invention over the prior art, some of the drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements have also been omitted in this application document. Those of ordinary skill in the art should be aware that these omitted elements may also constitute the content of the present invention.

Claims

1. A variable displacement oil pump slider control mechanism, comprising a slider (1) configured to be disposed in a rotor chamber and a pilot valve (2) connected to one side of the rotor chamber. Characterized in that: One side of the slider (1) is fixedly connected with a slider arm (1a). The pilot valve (2) includes a valve hole and a valve core (3) disposed in the valve hole and movable therein. The valve hole includes a front valve hole portion (2a), a middle valve hole portion (2b), and a rear valve hole portion (2c). The valve core (3) is located between the front valve hole portion (2a) and the middle valve hole portion (2b) and separates the front valve hole portion (2a) from the middle valve hole portion (2b). A first oil inlet hole (8a) is provided in the middle valve hole portion (2a). A compression spring (4) is disposed in the front valve hole portion (2a). The front and rear ends of the compression spring (4) respectively abut against the front end of the valve hole and the valve core (3). The valve core (3) is fixedly connected with a connecting rod (5). The front end of the connecting rod (5) passes through the front end of the valve hole and is movably connected with the slider arm (1a). The compression spring (4) can push against the valve core (3), and then the connecting rod (5) drives the slider arm (1a) to abut against the inner wall of the rotor chamber. The oil entering from the first oil inlet hole (8a) can push the valve core (3), and then the connecting rod (5) pushes the slider arm (1a) and drives the slider (1) to swing to achieve a change in displacement. A plug (9) and a bushing (10) installed at the front end of the plug (9) are provided in the rear valve hole portion (2c). A jack (11) is provided at the front end of the bushing (10). The rear end of the connecting rod (5) passes through the valve core (3) and is inserted into the jack (11). A second oil inlet hole (8b) controlled by an electromagnetic valve to open and close is provided at the rear portion of the bushing (10). The second oil inlet hole (8b) communicates with the jack (11). The oil entering from the second oil inlet hole (8b) can enter the jack (11) and push the connecting rod (5) from the rear end of the connecting rod (5). The first oil inlet hole (8a) is always communicated with an external feedback oil passage. The second oil inlet hole (8b) is controlled by an electromagnetic valve to open and close. The second oil inlet hole (8b) is opened for low-pressure stage variable displacement, and the second oil inlet hole (8b) is closed for high-pressure stage variable displacement.

2. The variable displacement oil pump slider control mechanism according to claim 1, Characterized in that: A chute (6) is provided on the slider arm (1a). A transmission pin (7) slidable along the chute (6) is provided in the chute (6). One end of the transmission pin (7) extends out of the chute (6) and is movably connected with the connecting rod (5).

3. The variable displacement oil pump slider control mechanism according to claim 2, Characterized in that: An installation hole for sleeving the transmission pin (7) is provided at the front end of the connecting rod (5). A limiting protrusion (7a) for preventing it from detaching from the connecting rod (5) is provided on the outer wall surface of the transmission pin (7). The limiting protrusion (7a) is located between the notch of the chute (6) and the connecting rod (5).

4. The variable displacement oil pump slider control mechanism according to claim 3, Characterized in that: The limiting protrusion (7a) is a ring-shaped clamping structure disposed on the outer wall of the connecting rod (5).

5. The variable displacement oil pump slider control mechanism according to claim 4, characterized in that: a connecting portion (5a) with a rectangular longitudinal section is provided at the front end of the connecting rod (5), the thickness of the connecting portion (5a) is smaller than the diameter of the connecting rod (5), and the mounting hole is arranged on the connecting portion (5a).

Images