Compact, rugged, insertable oil pump assembly

Abstract

This utility model aims to provide a compact and durable embedded oil pump assembly, which includes a pumping component and a transmission component. The pumping component includes a sleeve and a pumping shaft. The sleeve has a sliding hole along the axial direction, and two oil holes are radially formed at one end of the sleeve, both of which communicate with the sliding hole. One end of the pumping shaft has a stepped groove, and the pumping shaft fits into the sliding hole so that the inner wall of the stepped groove and the inner wall of the sliding hole together form a pumping chamber. The transmission component includes a hard plastic worm and a hard steel worm wheel. The hard steel worm wheel is located at the end of the pumping shaft away from the stepped groove. The hard plastic worm meshes with the hard steel worm wheel. When the hard plastic worm rotates under force, it causes the hard steel worm wheel to drive the pumping shaft to rotate and slide axially within the sliding hole, so that the pumping chamber is cyclically connected to the two oil holes, and the volumes of the pumping chamber and the two oil holes are different. In this way, the wear between the hard steel worm wheel and the hard plastic worm can be effectively reduced, thereby improving the service life of the hard steel worm wheel and the hard plastic worm.

Description

Technical Field

[0001] This utility model relates to the technical field of chainsaw oil pumps, and in particular to a compact and durable embedded oil pump assembly. Background Technology

[0002] As an important tool for garden maintenance, the lifespan of chainsaws is increasingly being emphasized. To keep the chain components of chainsaws lubricated, an oil pump is used to circulate machine oil.

[0003] However, due to the frequent friction of the pumping structure in current chainsaw pumps, the service life of the pumping structure is too short, generally between 100 and 500 hours. When it is damaged, it needs to be replaced, resulting in excessively high operating costs for chainsaws. Therefore, in order to improve the service life of the pumping structure of chainsaw pumps and enhance product competitiveness, this application proposes a compact and durable embedded pump assembly. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a compact and durable embedded oil pump assembly that can improve service life and enhance product competitiveness.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A compact and durable embedded oil pump assembly includes:

[0007] A pumping assembly includes a sleeve and a pumping shaft. The sleeve has a sliding hole along its axial direction, and two oil holes are formed radially at one end of the sleeve, both of which communicate with the sliding hole. One end of the pumping shaft has a stepped groove, and the pumping shaft is adapted to pass through the sliding hole so that the inner wall of the stepped groove and the inner wall of the sliding hole together form a pumping chamber.

[0008] The transmission assembly includes a hard plastic worm gear and a hard steel worm wheel. The hard steel worm wheel is disposed on the end of the pump shaft away from the stepped groove. The hard plastic worm gear meshes with the hard steel worm wheel. When the hard plastic worm gear is rotated under force, the hard steel worm wheel drives the pump shaft to rotate and slide axially within the sliding hole, so that the pump chamber is cyclically connected to the two oil holes, and the volumes of the pump chamber and the two oil holes are different when they are connected.

[0009] Optionally, the hardened steel worm gear and the pump shaft are integrally formed.

[0010] Optionally, the hardness range of the hardened steel worm gear is HV570 to HV770.

[0011] Optionally, the hard plastic worm gear has a locking hole at its center.

[0012] Optionally, the pump shaft is provided with a closed oblique annular groove, and the sleeve is provided with a limiting post. One end of the limiting post extends into the oblique annular groove. When the pump shaft rotates, the limiting post pushes against the inner wall of the oblique annular groove, thereby causing the pump shaft to slide along the axial direction of the sliding hole.

[0013] Optionally, a locking hole is provided on the outer wall of the sleeve, and the limiting post is inserted into the locking hole.

[0014] Optionally, the sleeve is made of metal.

[0015] Optionally, the two oil holes are arranged coaxially.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] This utility model discloses a compact and durable embedded oil pump assembly, comprising a pumping assembly and a transmission assembly. The pumping assembly includes a sleeve and a pumping shaft. The sleeve has a sliding hole along the axial direction, and two oil holes are radially formed at one end of the sleeve, both of which communicate with the sliding hole. One end of the pumping shaft has a stepped groove, and the pumping shaft is adapted to pass through the sliding hole so that the inner wall of the stepped groove and the inner wall of the sliding hole together form a pumping chamber. The transmission assembly includes a hard plastic worm and a hard steel worm wheel. The hard steel worm wheel is located at the end of the pumping shaft away from the stepped groove. The hard plastic worm and the hard steel worm wheel mesh. When the hard plastic worm is rotated under force, it causes the hard steel worm wheel to drive the pumping shaft to rotate and slide axially within the sliding hole, so that the pumping chamber is cyclically connected to the two oil holes, and the volumes of the pumping chamber and the two oil holes are different when they are connected. Therefore, by setting the hardened steel worm gear to be made of hard metal and the hardened plastic worm to be made of hard plastic, the wear between the hardened steel worm gear and the hardened plastic worm can be effectively reduced, thereby increasing the service life of the hardened steel worm gear and the hardened plastic worm. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a compact and durable embedded oil pump assembly according to one embodiment of the present invention;

[0020] Figure 2 for Figure 1 A cross-sectional schematic diagram of a compact and durable embedded oil pump assembly is shown.

[0021] Figure 3 for Figure 1 A cross-sectional view of the compact and durable embedded oil pump assembly from another angle;

[0022] Figure 4 This is a partial structural schematic diagram of the pump shaft according to one embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10. Compact and durable embedded oil pump assembly; 100. Pumping assembly; 200. Transmission assembly; 110. Sleeve; 120. Pump shaft; 111. Sliding hole; 112. Oil hole; 121. Stepped groove; 210. Hardened steel worm gear; 220. Hardened plastic worm; 221. Locking hole; 122. Inclined ring groove; 130. Limiting post; 113. Locking hole. Detailed Implementation

[0025] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model.

[0026] like Figures 1 to 4 As shown, a compact and durable embedded oil pump assembly 10 includes a pumping assembly 100 and a transmission assembly 200. The pumping assembly 100 includes a sleeve 110 and a pumping shaft 120. The sleeve 110 has a sliding hole 111 along the axial direction, and two oil holes 112 are formed radially at one end of the sleeve 110, both of which communicate with the sliding hole 111. A stepped groove 121 is formed at one end of the pumping shaft 120, and the pumping shaft 120 is adapted to pass through the sliding hole 111, so that the inner wall of the stepped groove 121 is flush with the sliding hole 111. The inner walls of 11 together form a pump oil chamber; the transmission assembly 200 includes a hard steel worm gear 210 and a hard plastic worm 220. The hard steel worm gear 210 is located on the end of the pump oil shaft 120 away from the stepped groove 121. The hard plastic worm 220 meshes with the hard steel worm gear 210. When the hard plastic worm 220 is rotated under force, the hard steel worm gear 210 drives the pump oil shaft 120 to rotate and slide axially in the sliding hole 111, so that the pump oil chamber is cyclically connected to the two oil holes 112, and the volumes of the pump oil chamber and the two oil holes 112 are different when they are connected.

[0027] It should be noted that the transmission assembly 200 is used to drive the pump assembly 100 to move so that the oil can flow in a specific direction. Specifically, a sliding hole 111 is provided on the axis of the sleeve 110, and two oil holes 112 are provided radially near one end of the sleeve 110. One oil hole 112 is used for oil to flow in, and the other oil hole 112 is used for oil to flow out. Furthermore, the pump shaft 120 is adapted to pass through the sliding hole 111. Specifically, the pump shaft 120 can slide along the axial direction of the sliding hole 111 and can also rotate relative to the sliding hole 111. Furthermore, a stepped groove 121 is provided on one end of the oil pump shaft 120 located within the sliding hole 111, so that the end of the oil pump shaft 120 near the stepped groove 121 and the inner wall of the oil hole 112 form an oil pumping chamber. When the oil pump shaft 120 rotates relative to the sliding hole 111, it also slides axially along the sliding hole 111, causing the volume of the oil pumping chamber to periodically and continuously increase or decrease with the rotation of the oil pump shaft 120. Thus, when the volume of the oil pumping chamber increases, the stepped groove 121 connects with the oil hole 112 for oil inflow, and the oil is drawn into the oil pumping chamber under negative pressure due to the increased volume. When the volume of the oil pumping chamber decreases, the stepped groove 121 connects with the oil hole 112 for oil outflow, and the oil in the oil pumping chamber is forced out through the oil hole 112. As the pump shaft 120 rotates in one direction, the stepped groove 121 periodically connects with the two oil holes 112, allowing oil to continuously flow from one oil hole 112 through the pump chamber to the other, thus achieving the oil pumping function. Furthermore, the transmission assembly 200 is used to precisely control the rotation of the pump shaft 120. Only when the rotational speed of the pump shaft 120 is precisely controlled can the period and effective duration of the connection between the pump chamber and the two oil holes 112 be precisely controlled. Therefore, the transmission assembly 200 is configured with a structure in which a hardened steel worm gear 210 and a hardened plastic worm 220 engage. Specifically, the hardened steel worm gear 210 is installed on the end of the pump shaft 120 away from the stepped groove 121, and the hardened plastic worm 220 meshes with the hardened steel worm gear 210. Thus, when the hardened plastic worm 220 rotates, it can smoothly drive the hardened steel worm gear 210 to rotate, thereby driving the pump shaft 120 to rotate stably. Because the engine oil has a certain pressure, the structure of the hardened steel worm gear 210 and the hardened plastic worm 220 is a one-way drive mechanism. This prevents the oil pump shaft 120 from pushing the hardened plastic worm 220 to rotate in the opposite direction; only the hardened plastic worm 220 can drive the hardened steel worm gear 210 to rotate. This ensures accurate pumping of engine oil. Furthermore, due to the meshing action between the hardened plastic worm gear 220 and the hardened steel worm gear 210, there will be continuous friction between them. In the prior art, these two components are usually made of metal, which will lead to wear between the two components, and their service life is usually between 100 hours and 500 hours.This application proposes a new technical solution, in which the hard steel worm gear 210 is made of hard metal and the hard plastic worm 220 is made of hard plastic. By setting the two to be made of different materials, the wear between the hard steel worm gear 210 and the hard plastic worm 220 can be effectively reduced, thereby increasing the service life of the hard steel worm gear 210 and the hard plastic worm 220. Experimental verification shows that this design of the hard steel worm gear 210 and the hard plastic worm 220 can extend the service life to more than 1,000 hours.

[0028] In one embodiment, the hardened steel worm gear 210 and the oil pump shaft 120 are integrally formed. That is, the hardened steel worm gear 210 and the oil pump shaft 120 are both made of hardened steel.

[0029] In one embodiment, the hardness range of the hardened steel worm gear 210 is HV570 to HV770. Here, HV is the symbol for Vickers hardness. For example, the hardened steel worm gear 210 is made of steel, and its hardness is increased through surface treatment processes such as carburizing / nitriding, laser cladding, and high-frequency quenching, resulting in a hardness range of HV570 to HV770.

[0030] In one embodiment, the rigid plastic worm gear 220 is made of PA66 and GF30. Specifically, PA66 is polyamide 66, also known as nylon 66, a high-performance thermoplastic engineering plastic formed by the condensation polymerization of hexamethylenediamine and adipic acid, possessing excellent mechanical strength, heat resistance, wear resistance, and chemical stability. Further, GF30 refers to the material containing 30% glass fiber by weight in the material used to make the rigid plastic worm gear 220. Thus, the rigid plastic worm gear 220, molded from the mixture of PA66 and GF30, possesses sufficient hardness. In this way, the rigid plastic worm gear 220 and the hardened steel worm wheel 210 are made of two different materials, which effectively balances the hardness and wear resistance of the components, thereby reducing wear between the hardened steel worm wheel 210 and the rigid plastic worm gear 220.

[0031] like Figure 1 and Figure 2 As shown, in one embodiment, a locking hole 221 is provided at the center of the hard plastic worm gear 220.

[0032] It should be noted that the locking hole 221 is a non-circular irregular hole. For example, the locking hole 221 can be a polygonal hole structure or an oblong hole structure. In this way, the output shaft of the rotary drive source such as the motor can be fixed by passing through the locking hole 221 through the coupling block, so that the rotary drive source can stably drive the hard plastic worm gear 220 to rotate.

[0033] like Figures 2 to 4As shown, in one embodiment, the pump shaft 120 is provided with a closed oblique annular groove 122, and the sleeve 110 is provided with a limiting post 130. One end of the limiting post 130 extends into the oblique annular groove 122. When the pump shaft 120 rotates, the limiting post 130 pushes against the inner wall of the oblique annular groove 122, thereby causing the pump shaft 120 to slide axially along the sliding hole 111.

[0034] It should be noted that when the transmission assembly 200 drives the pump shaft 120 to rotate relative to the sliding hole 111, in order to allow the pump shaft 120 to slide axially along the sliding hole 111, thereby increasing or decreasing the volume of the pump chamber, a closed oblique annular groove 122 is formed on the outer peripheral wall of the pump shaft 120. Specifically, the oblique annular groove 122 has an inclined structure on the outer peripheral wall of the pump shaft 120. A limiting post 130 is fixedly installed on the sleeve 110, so that the limiting post 130 extends into the sliding hole 111 and into the oblique annular groove 122. Thus, when the pump shaft 120 rotates, the limiting post 130 pushes against the oblique annular groove 122, thereby causing the pump shaft 120 to slide axially while rotating, thereby increasing or decreasing the volume of the pump chamber.

[0035] like Figure 1 and Figure 3 As shown, in one embodiment, a retaining hole 113 is provided on the outer side wall of the sleeve 110, and the limiting post 130 is inserted into the retaining hole 113. It should be noted that the limiting post 130 is inserted into the retaining hole 113, thereby fixing the limiting post 130 and the sleeve 110, which facilitates the processing of the limiting post 130 and the sleeve 110 respectively.

[0036] In one embodiment, the sleeve 110 is made of metal. This allows the pump shaft 120 to rotate stably within the sliding hole 111 and slide axially.

[0037] In one embodiment, the two oil holes 112 are coaxially arranged. Thus, the two oil holes 112 are circumferentially symmetrical about the axis of the sliding hole 111. When the oil pump shaft 120 rotates in the sliding hole 111, the oil pump chamber can be stably circulated and connected to the two oil holes 112, thereby enabling precise pumping of engine oil.

[0038] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the utility model patent. Unless otherwise specifically defined, the installation / fixing / setting mentioned in this utility model can be understood as including, but not limited to, locking and fixing with screws / bolts, welding, or bonding with adhesives, wherein the adhesives used can be commercially available finished products. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A compact and robust insertable oil pump assembly, characterized in that, include: A pumping assembly includes a sleeve and a pumping shaft. The sleeve has a sliding hole along its axial direction, and two oil holes are formed radially at one end of the sleeve, both of which communicate with the sliding hole. One end of the pumping shaft has a stepped groove, and the pumping shaft is adapted to pass through the sliding hole so that the inner wall of the stepped groove and the inner wall of the sliding hole together form a pumping chamber. The transmission assembly includes a hard plastic worm gear and a hard steel worm wheel. The hard steel worm wheel is disposed on the end of the pump shaft away from the stepped groove. The hard plastic worm gear meshes with the hard steel worm wheel. When the hard plastic worm gear is rotated under force, the hard steel worm wheel drives the pump shaft to rotate and slide axially within the sliding hole, so that the pump chamber is cyclically connected to the two oil holes, and the volumes of the pump chamber and the two oil holes are different when they are connected.

2. The compact and robust insertable oil pump assembly of claim 1, wherein, The hardened steel worm gear and the oil pump shaft are integrally formed.

3. A compact and robust insertable oil pump assembly according to claim 1 or 2, characterized in that The hardness range of the hardened steel worm gear is HV570 to HV770.

4. The compact and robust insertable oil pump assembly of claim 1, wherein, The hard plastic worm gear has a locking hole at its center.

5. The compact and robust insertable oil pump assembly of claim 1, wherein, The pump shaft has a closed oblique annular groove, and the sleeve is provided with a limiting post. One end of the limiting post extends into the oblique annular groove. When the pump shaft rotates, the limiting post pushes against the inner wall of the oblique annular groove, thereby causing the pump shaft to slide along the axial direction of the sliding hole.

6. The compact and robust insertable oil pump assembly of claim 5, wherein, A locking hole is provided on the outer wall of the sleeve, and the limiting post is inserted into the locking hole.

7. The compact and robust insertable oil pump assembly of claim 1, wherein, The sleeve is made of metal.

8. The compact and robust insertable oil pump assembly of claim 1, wherein, The two oil holes are arranged coaxially.

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