A lubricating oil pump

Abstract

The present invention provides a lubricating oil pump, comprising: a pump body, in which a gear rod is mounted; a valve seat, mounted at one end of the gear rod to separate the pump body into an oil inlet chamber and an oil outlet chamber, and having at least one oil hole on the valve seat to connect the oil inlet chamber and the oil outlet chamber; a spring support, sleeved on the gear rod; a valve plate, sleeved on the gear rod and in contact with the top of the valve seat; a spring, one end of which is connected to the spring support and the other end is in contact with the valve plate, and the spring support, valve plate and spring are located in the oil outlet chamber; during the oil pump's oil suction process, the gear rod moves upward, and the valve plate is lifted by the action of oil pressure, so that the oil hole connects the oil inlet chamber and the oil outlet chamber; during the oil discharge process, the gear rod moves downward, and under the action of the spring elastic force, the valve plate is squeezed, closing the oil hole, thereby isolating the oil inlet chamber from the oil outlet chamber. The present invention effectively improves the volumetric efficiency of the oil pump and can achieve unidirectional flow during the oil pump's oil suction and discharge processes.

Description

Technical Field

[0001] The invention belongs to the technical field of garden tools, and particularly relates to a lubricating oil pump. Background Art

[0002] Garden tools typically consist of a power unit, a gearbox, and a rotating element. The rotating element rotates back and forth under the power unit's drive. For example, a chainsaw is a garden tool used in fields like logging and timber production. While portable and easy to operate, it's complex to maintain and repair, and requires lubrication to ensure proper function. Chainsaws primarily rely on the shear force generated by the lateral movement of the chain's cutting teeth to cut through trees. When workers cut wood, the prolonged dry friction between the saw chain and the wood causes the chain to overheat, affecting the cutting effect. Therefore, a continuous supply of oil to the chain is necessary to lubricate and reduce wear.

[0003] Commercially available lubricating oil pumps can mix the suction and discharge oil. This means that when the pump discharges oil from the outlet, lubricating oil also flows out of the inlet. Low-speed lubricating oil pumps, due to their low volumetric efficiency, can easily cause the pump to fail to deliver oil. Furthermore, the space inside a chainsaw is generally compact, and traditional ball-and-spring check valves must be located separately at the inlet and outlet. These components are numerous and dispersed, making installation difficult due to space constraints. Summary of the Invention

[0004] The present invention proposes a lubricating oil pump to improve the problem of oil mixing during suction and discharge in lubricating oil pumps on the market, that is, when the oil pump discharges oil from the oil discharge port, the lubricating oil is also discharged from the oil inlet port at the same time, and for lubricating oil pumps with lower speeds, the volumetric efficiency is lower, which easily leads to the problem of the oil pump not discharging oil.

[0005] The present invention provides a lubricating oil pump, comprising:

[0006] A pump body, wherein a gear rod is installed in the pump body;

[0007] a valve seat mounted on one end of the gear rod to separate the cavity in the pump body into an oil inlet chamber and an oil outlet chamber, and the valve seat is provided with at least one oil hole to connect the oil inlet chamber and the oil outlet chamber;

[0008] A spring support, sleeved on the gear rod;

[0009] a valve plate, sleeved on the gear rod and in contact with the top of the valve seat;

[0010] a spring, one end of which is connected to the spring support and the other end of which is in contact with the valve plate, wherein the spring support, the valve plate and the spring are all located in the oil outlet chamber;

[0011] In which, the oil pump includes an oil suction process and an oil discharge process. During the oil suction process, the gear rod moves upward, and the valve plate is lifted under the action of oil pressure, so that the oil hole connects the oil inlet chamber and the oil outlet chamber; during the oil discharge process, the gear rod moves downward, and under the elastic force of the spring, the valve plate is squeezed to close the oil hole, thereby isolating the oil inlet chamber and the oil outlet chamber.

[0012] In one embodiment of the present invention, the oil inlet chamber is connected to an oil inlet port. When the gear rod moves upward, the lubricating oil flows from the oil inlet port through the oil inlet chamber and into the oil hole, and the spring is compressed under the action of the oil pressure to lift the valve plate, and the lubricating oil flows from the oil hole into the oil outlet chamber, completing the oil suction process.

[0013] In one embodiment of the present invention, the oil outlet chamber is connected to an oil outlet. When the gear rod moves downward, the spring squeezes the valve plate to close the oil hole, so that the lubricating oil is discharged from the oil outlet, completing the oil discharge process.

[0014] In one embodiment of the present invention, a first sealing ring is provided on the outer side of the valve seat.

[0015] In one embodiment of the present invention, two oil holes are provided, and the two oil holes are symmetrically arranged on the valve seat.

[0016] In one embodiment of the present invention, the gear rod includes a first portion and a second portion, and a maximum diameter of the first portion is smaller than a maximum diameter of the second portion.

[0017] In one embodiment of the present invention, a threaded structure is provided on one end of the gear rod connected to the valve seat, and a threaded through hole is provided in the middle of the valve seat for threaded connection with the gear rod.

[0018] In one embodiment of the present invention, a shoulder is further provided on the gear rod, and the shoulder is located above the threaded structure.

[0019] In one embodiment of the present invention, a locking nut is threadedly connected to one end of the gear rod provided with the threaded structure, and the nut is located below the valve seat.

[0020] In one embodiment of the present invention, a cam groove is further provided on the gear rod, and the cam groove is located above the spring support.

[0021] In one embodiment of the present invention, a cylindrical pin is further installed on the inner wall of the pump body, and one end of the cylindrical pin is located in the cam groove.

[0022] In one embodiment of the present invention, a second sealing ring is further provided on the gear rod and is located above the cam groove.

[0023] The present invention discloses a lubricating oil pump, wherein a spiral groove is machined on a gear rod, a cylindrical pin is interference-fitted with an oil pump cavity, a motor drives the gear rod to rotate, and the gear rod generates axial displacement, causing a volume change inside the oil pump cavity. When the gear rod moves outward, lubricating oil flows from the oil inlet through the oil hole on the valve seat to push open the valve plate and flow into the oil outlet chamber, completing the oil suction action. When the gear rod moves inward, a spring presses the valve plate against the valve seat to close the oil hole on the valve seat, thereby allowing the lubricating oil to be discharged from the oil outlet chamber through the oil outlet, completing the oil discharge action. The present invention isolates the oil inlet from the oil outlet to ensure that there is no oil cross-contamination during the oil suction and discharge processes, effectively improving the volumetric efficiency of the lubricating oil pump, and can achieve unidirectional flow during the oil suction and discharge processes of the lubricating oil pump, thereby greatly improving the volumetric efficiency of the lubricating oil pump, effectively solving the problem of no oil discharge due to low volumetric efficiency and low speed, and having the advantages of compact structure, high volumetric efficiency, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a structural schematic diagram of a lubricating oil pump proposed by the present invention.

[0026] Figure 2 Schematic diagram of an explosion of a lubricating oil pump according to one embodiment of the present invention.

[0027] Figure 3 Schematic diagram of the structure of a gear rod in a lubricating oil pump in one embodiment of the present invention.

[0028] Figure 4 Schematic diagram of the structure of a valve seat in a lubricating oil pump in one embodiment of the present invention.

[0029] Figure 5 This is a front view of a lubricating oil pump in one embodiment of the present invention.

[0030] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along the middle line AA.

[0031] Figure 7 FIG. 4 is a side view of a lubricating oil pump according to an embodiment of the present invention.

[0032] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along the middle line BB.

[0033] Figure 9 This is a front view of a pump body in a lubricating oil pump in one embodiment of the present invention.

[0034] Figure 10 for Figure 9 Schematic diagram of the cross-sectional structure of the middle edge CC.

[0035] Figure 11 FIG. 4 is a side view of a pump body of a lubricating oil pump according to an embodiment of the present invention.

[0036] Figure 12 for Figure 11 Schematic diagram of the cross-sectional structure along the middle edge DD. Description of the drawings:

[0038] Lubricating oil pump 100; pump body 10; oil inlet chamber 101; oil outlet chamber 102; oil inlet 1011; oil outlet 1021; gear rod 20; first part 201; second part 202; locking nut 203; cam groove 204; valve seat 30; spring support 40; spring 50; valve plate 60; threaded structure 21; threaded through hole 31; oil hole 32; groove 301; first sealing ring 302; shaft shoulder 22; threaded structure 21; stepped structure 103; positioning groove 104; cylindrical pin 105; gear structure 206; annular groove 207; second sealing ring 208. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0040] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0041] like Figures 1 to 12As shown, the present invention proposes a lubricating oil pump 100, which is used to improve the phenomenon of oil mixing during suction and discharge of the lubricating oil pump 1 on the market, that is, when the oil pump discharges oil from the oil discharge port, the lubricating oil is also discharged from the oil inlet port at the same time, and for lubricating oil pumps with lower speeds, due to the lower volumetric efficiency, it is easy to cause the oil pump to fail to discharge oil. Specifically, in this embodiment, the lubricating oil pump 100 includes a pump body 10, a gear rod 20, a valve seat 30, a spring support 40, a spring 50 and a valve plate 60, the valve seat 30 is mounted on one end of the gear rod 20, the spring support 40, the spring 50 and the valve plate 60 are sequentially sleeved on the gear rod 20 and located above the valve seat 30, and at the same time, the valve seat 30, the spring support 40, the spring 50 and the valve plate 60 are all located in the chamber of the pump body 10.

[0042] like Figures 1 to 4 、 Figure 8 As shown, in this embodiment, a threaded structure 21 is provided on one end of the gear rod 20 connected to the valve seat 30, and a threaded through hole 31 is also provided in the middle part of the valve seat 30 to facilitate threaded connection with the end of the gear rod 20 provided with the threaded structure 21, and the valve seat 30 is located in the chamber of the pump body 10 to separate the chamber of the pump body 10 into an oil inlet chamber 101 and an oil outlet chamber 102, and the oil outlet chamber 102 is located above the oil inlet chamber 101, and at least one oil hole 32 is provided on the valve seat 30 to serve as an oil path for lubricating oil to enter the oil outlet chamber 102 from the oil inlet chamber 101.

[0043] like Figures 1 to 4 As shown, it should be noted that the valve seat 30 is cylindrical and has a threaded through hole 31 in the middle for connection with the gear rod 20. The outer circumference of the valve seat 30 is inwardly recessed to form a groove 301 for mounting a first sealing ring 302. The first sealing ring 302 is located between the valve seat 30 and the inner wall of the pump body 10 to eliminate the gap between the outer wall of the valve seat 30 and the inner wall of the pump body 10. This allows the lubricating oil to enter the oil outlet chamber 102 only through the oil hole 32 on the valve seat 30 during the oil suction process of the pump body 10. At the same time, during the oil discharge process of the pump body 10, the lubricating oil is prevented from flowing into the oil inlet chamber 101 through the gap between the outer wall of the valve seat 30 and the inner wall of the pump body 10. In this embodiment, the first sealing ring 302 is, for example, a nitrile rubber sealing ring.

[0044] like Figures 1 to 4As shown, it should also be noted that the number of oil holes 32 on the valve seat 30 can be set to 2 or 3, for example. In this embodiment, the number of the oil holes 32 is preferably 2, and the two oil holes 32 are arranged on both sides of the valve seat 30 and are symmetrically arranged about the axis of the valve seat 30, so that when the pump body 10 pushes up the valve plate 60 under the action of oil pressure during the oil suction process, the force acting on the valve plate 60 remains balanced.

[0045] like Figures 1 to 3 As shown, in this embodiment, a spring support 40 and a spring 50 are further sleeved on the gear rod 20, and one end of the spring 50 is connected to the spring support 40. Specifically, the gear rod 20 includes a first portion 201 and a second portion 202. The first portion 201 is used to mount the valve seat 30, the spring support 40, the spring 50, and the valve plate 60. The maximum diameter of the first portion 201 is smaller than the maximum diameter of the second portion 202. That is, the gear rod 10 has a stepped structure at the connection between the first portion 201 and the second portion 202 to facilitate the installation of the spring support 40, so that the spring support 40 abuts against the stepped structure.

[0046] like Figure 2 、 Figures 5 to 12 As shown, in this embodiment, a valve plate 60 is further sleeved on the gear rod 20, and the valve plate 60 is located above the valve seat 30 and contacts the valve seat 30, and one end of the spring 50 is connected to the spring support 40, and the other end is in contact with the valve plate 60, so that when the oil pump is sucking oil, the gear rod 20 moves upward, and the valve plate 60 is lifted under the action of oil pressure, so that the oil hole 32 connects the oil inlet chamber 101 and the oil outlet chamber 102; during the oil discharge process, the gear rod 20 moves downward, and the valve plate 60 is squeezed by the elastic force of the spring 50 to close the oil hole 32, thereby isolating the oil inlet chamber 101 and the oil outlet chamber 102.

[0047] like Figure 2 、 Figures 5 to 12 As shown, it should be noted that, in this embodiment, a locking nut 203 is also installed on one end of the gear rod 20 connected to the valve seat 30, and the locking nut 203 is located below the valve seat 30 to lock the valve seat 30, the spring support 40, the spring 50 and the valve plate 60 on the gear rod 20.

[0048] like Figure 2 、 Figure 3 、 Figures 5 to 12As shown, it should also be noted that when the valve seat 30 is connected to the gear rod 20, if the distance between the valve seat 30 and the second portion 202 of the gear rod 20 is too close, the spring 50 installed between the valve seat 30 and the second portion 202 is compressed, causing the valve plate 60 to be pressed against the top of the valve seat 30 and close the oil hole 32. At this time, during the oil suction process, the oil pressure cannot overcome the elastic force of the spring 50 on the valve plate 60, so that the valve plate 60 cannot be lifted to connect the oil inlet chamber 101 and the oil outlet chamber, and the oil suction process cannot be achieved. Therefore, in this embodiment, a shaft shoulder 22 is further provided on the first portion 201 of the gear rod 20. The shaft shoulder 22 is located above the threaded structure 21 to limit the valve seat 30 and prevent the distance between the valve seat 30 and the second portion 202 of the gear rod 20 from being too close when the valve seat 30 is connected to the gear rod 20, thereby ensuring the smooth progress of the oil suction process.

[0049] like Figure 2 、 Figure 3 、 Figures 5 to 12 As shown, in this embodiment, a cam groove 204 is further provided on the gear rod 20, and the cam groove 204 is located on the second portion 202 of the gear rod 20, that is, above the spring support 40, and a positioning groove 104 is further provided on the inner wall of the pump body 10, and the positioning groove 104 extends along the radial direction of the pump body 10, and a cylindrical pin 105 is assembled in the positioning groove 104, and the cylindrical pin 105 and the positioning groove 104 are interference fit, and one end of the cylindrical pin 105 is located in the cam groove 204, and the cam groove 204 is inclined relative to the vertical line of the rotation axis 205 of the gear rod 20.

[0050] like Figure 2 、 Figure 3 、 Figures 5 to 12 As shown, when the gear rod 20 rotates about the axis 209, the cam groove 204 cooperates with the cylindrical pin 105 on the inner wall of the pump body 10 to achieve an oscillating stroke motion of the gear rod 20 in the direction of the axis 209, that is, the gear rod 20 moves up and down within the pump body 10. In addition, in this embodiment, the end of the gear rod 20 away from the valve seat 20 extends out of the cavity of the pump body 10 and is provided with a gear structure 206 for connection to an external drive mechanism (not shown) to drive the gear rod 20 to reciprocate within the pump body 10, thereby achieving the oil suction and discharge processes of the pump body 10.

[0051] like Figure 2 、 Figure 3 、 Figures 5 to 12As shown, it should be noted that, in this embodiment, an annular groove 207 is further provided on the second portion 202 of the gear rod 20. A second sealing ring 208 is installed in the annular groove 207. That is, the second sealing ring 208 is located between the gear rod 20 and the inner wall of the pump body 10 to eliminate the gap between the outer wall of the gear rod 20 and the inner wall of the pump body 10, thereby preventing lubricating oil from leaking out of the gap between the outer wall of the gear rod 20 and the inner wall of the pump body 10. In this embodiment, the second sealing ring 208 is, for example, a nitrile rubber sealing ring.

[0052] like Figure 2 、 Figure 3 、 Figures 5 to 12 As shown, in this embodiment, an oil inlet 1011 is further provided on the pump body 10. The oil inlet 1011 is connected to the oil inlet chamber 101. Specifically, during the oil suction process of the lubricating oil pump 100, the gear rod 20 is driven to move upward, and the lubricating oil flows from the oil inlet 1011 through the oil inlet chamber 101 and into the oil hole 32, and the spring 50 is compressed under the action of oil pressure to lift the valve plate 60. At this time, the oil hole 31 connects the oil inlet chamber 101 and the oil outlet chamber 102, and the lubricating oil flows from the oil hole 32 into the oil outlet chamber 102 to complete the oil suction process.

[0053] like Figure 2 、 Figure 3 、 Figures 5 to 12 As shown, in this embodiment, an oil outlet 1021 is further provided on the pump body 10, and the oil outlet 1021 is connected to the oil outlet chamber 102. During the oil discharge process of the lubricating oil pump 100, the gear rod 20 is driven to move downward, so that the spring 50 squeezes the valve plate 60 to close the oil hole 32 on the valve seat 30. At this time, the oil inlet chamber 101 and the oil outlet chamber 102 are separated, and the lubricating oil cannot flow between the oil inlet chamber 101 and the oil outlet chamber 102 from the oil hole 32, so that the lubricating oil can only be discharged from the oil outlet chamber 102 from the oil outlet chamber 102, completing the oil discharge process.

[0054] The present invention discloses a lubricating oil pump, wherein a spiral groove is processed on a gear rod, a cylindrical pin is interference-fitted with an oil pump cavity, and a motor drives the gear rod to rotate, causing axial displacement of the gear rod to cause a volume change inside the oil pump cavity; when the gear rod moves upward (outside the pump body), the lubricating oil flows from the oil inlet through the oil hole on the valve seat, and under the action of oil pressure, the valve plate is pushed open and flows into the oil outlet chamber, completing the oil suction action; when the gear rod moves downward (inside the pump body), the spring is compressed, and under the elastic force of the spring, the valve plate is pressed against the valve seat to close the oil hole on the valve seat, thereby allowing the lubricating oil to be discharged from the oil outlet chamber through the oil outlet, completing the oil discharge action. The present invention isolates the oil inlet from the oil outlet to ensure that there is no oil cross-contamination during the oil suction and discharge processes, effectively improving the volumetric efficiency of the lubricating oil pump and realizing unidirectional flow during the oil suction and discharge processes of the lubricating oil pump, thereby greatly improving the volumetric efficiency of the lubricating oil pump and effectively solving the problem of no oil discharge caused by low volumetric efficiency and low rotation speed, and having the advantages of compact structure, high volumetric efficiency, low cost, etc.

[0055] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the inventive concept, such as the technical solutions formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0056] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A lubricating oil pump, characterized in that: include: A pump body, wherein a gear rod is installed in the pump body; a valve seat mounted on one end of the gear rod to separate the cavity in the pump body into an oil inlet chamber and an oil outlet chamber, and the valve seat is provided with at least one oil hole to connect the oil inlet chamber and the oil outlet chamber; A spring support, sleeved on the gear rod; a valve plate, sleeved on the gear rod and in contact with the top of the valve seat; a spring, one end of which is connected to the spring support and the other end of which is in contact with the valve plate, wherein the spring support, the valve plate and the spring are all located in the oil outlet chamber; In which, the oil pump includes an oil suction process and an oil discharge process. During the oil suction process, the gear rod moves upward, and the valve plate is lifted under the action of oil pressure, so that the oil hole connects the oil inlet chamber and the oil outlet chamber; during the oil discharge process, the gear rod moves downward, and under the elastic force of the spring, the valve plate is squeezed to close the oil hole, thereby isolating the oil inlet chamber and the oil outlet chamber.

2. The lubricating oil pump according to claim 1, characterized in that The oil inlet chamber is connected to an oil inlet port. When the gear rod moves upward, the lubricating oil flows from the oil inlet port through the oil inlet chamber and into the oil hole, and the spring is compressed under the action of the oil pressure to lift the valve plate, and the lubricating oil flows from the oil hole into the oil outlet chamber, completing the oil suction process.

3. The lubricating oil pump according to claim 1, characterized in that The oil outlet chamber is connected to an oil outlet. When the gear rod moves downward, the spring presses the valve plate to close the oil hole, so that the lubricating oil is discharged from the oil outlet, completing the oil discharge process.

4. The lubricating oil pump according to claim 1, characterized in that A first sealing ring is provided on the outer side of the valve seat.

5. The lubricating oil pump according to claim 1, characterized in that There are two oil holes, and the two oil holes are symmetrically arranged on the valve seat.

6. The lubricating oil pump according to claim 1, characterized in that The gear rod includes a first portion and a second portion, and a maximum diameter of the first portion is smaller than a maximum diameter of the second portion.

7. The lubricating oil pump according to claim 1, characterized in that A threaded structure is provided on one end of the gear rod connected to the valve seat, and a threaded through hole is provided in the middle of the valve seat for threaded connection with the gear rod.

8. The lubricating oil pump according to claim 7, characterized in that: The gear rod is also provided with a shaft shoulder, and the shaft shoulder is located above the threaded structure.

9. The lubricating oil pump according to claim 7, characterized in that: One end of the gear rod provided with the threaded structure is also connected to a locking nut through a thread, and the nut is located below the valve seat.

10. The lubricating oil pump according to claim 1, characterized in that The gear rod is also provided with a cam groove, and the cam groove is located above the spring support.

11. The lubricating oil pump according to claim 10, characterized in that: A cylindrical pin is also installed on the inner wall of the pump body, and one end of the cylindrical pin is located in the cam groove.

12. The lubricating oil pump according to claim 10, characterized in that A second sealing ring is also provided on the gear rod and is located above the cam groove.

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