Oil pump used on chain saw

Abstract

The oil pump used on the chain saw comprises a front shell, a rear shell, a driving shaft, a worm gear, an eccentric shaft and a reset structure, a first through hole, a second through hole and a matching opening are formed in the shell, the driving shaft is located in the front shell and the rear shell at the same time, the eccentric shaft is arranged on the rear shell, an insertion end is arranged at the position, facing a port of the rear shell, of the front shell, and the worm gear is arranged in the insertion end. An extending end is arranged at the end opening, facing the front shell, of the rear shell and comprises a matching part located on the side close to the front shell, a crack is formed in the matching part, external threads are arranged on the outer wall of the extending end and located on the side, away from the front shell, of the matching part, and the extending end is sleeved with a rotating cylinder. The inner wall of the rotating cylinder comprises an internal thread matched with the external thread and a circular-truncated-cone-shaped clamping area arranged on the side, close to the front shell, of the internal thread, and compared with the prior art, stepless adjustment can be carried out while the structure is simple and assembly and maintenance are convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil pumps, and in particular relates to an oil pump used on a chain saw. Background Art

[0002] A chain saw is a tool used for gardening and pruning shrubs and usually includes an oil pump, which is used to supply oil to the chain and guide bar to prevent excessive heat generated by friction when the chain saw is working.

[0003] The common oil pumps on the market usually include a housing, a drive shaft arranged in the housing, a worm gear arranged on the drive shaft, and a drive member that makes the drive shaft reciprocate along its own axis. The worm gear cooperates with the worm arranged outside the housing. The housing is usually provided with through hole 1, through hole 2, and a matching port for facilitating the cooperation between the turbine and the worm. The oil enters and exits the housing through through hole 1 and through hole 2. The drive member is usually an eccentric shaft perpendicular to the drive shaft and a reset structure that keeps the end of the drive shaft facing the eccentric shaft in contact with the side wall of the eccentric shaft. The worm gear and the drive member operate simultaneously to complete the oil inlet and oil discharge actions.

[0004] Traditional oil pumps cannot adjust the flow rate, so oil pumps with adjustable flow rate have appeared on the market. However, existing oil pumps with adjustable flow rate function either have a complex structure, which makes the overall size of the oil pump larger, and are prone to failure and inconvenient to repair; or they can only be adjusted to a few fixed levels, which cannot meet the fine adjustment needs of actual use. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the utility model provides an oil pump which is more convenient to adjust the flow rate than the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an oil pump used on a chain saw, comprising a housing, a drive shaft arranged in the housing, a worm gear arranged on the drive shaft, an eccentric shaft passing through the housing, and a reset structure for keeping the end of the drive shaft facing the eccentric shaft in contact with the side wall of the eccentric shaft, the housing is provided with a through hole 1, a through hole 2 and a matching opening corresponding to the worm gear, the housing comprises a front housing and a rear housing, the drive shaft is located in the front housing and the rear housing at the same time, the eccentric shaft is arranged in the rear housing, and a cylindrical insertion end is provided at the port of the front housing facing the rear housing, The rear shell is provided with a cylindrical extension end for the insertion end to be inserted at the port facing the front shell, the extension end includes a matching portion located on the side close to the front shell, the matching portion is provided with at least one crack extending in the direction away from the front shell, the outer wall of the extension end is provided with an external thread, the external thread is located on the side of the matching portion away from the front shell, the outer sleeve of the extension end is provided with a rotating cylinder, the inner wall of the rotating cylinder includes an internal thread matching the external thread and a truncated cone-shaped clamping area arranged on the side of the internal thread close to the front shell, the diameter of the clamping area away from the internal thread is smaller than the diameter of the side close to the internal thread.

[0007] When the above scheme is adopted, during assembly, the drive shaft is first installed into the front housing, the eccentric shaft is rotated into the rear housing, and other accessories are also installed together, and then the rotating cylinder is sleeved on the insertion end, and the insertion end is inserted into the extension end. After the insertion end is inserted to a suitable position, the rotating cylinder is moved to the extension end. During the mating process of the external thread and the internal thread, the clamping area clamps the mating part to close the crack, so that the mating part is tightly attached to the insertion end, so that the front housing and the rear housing are kept fixed. By adjusting the insertion depth of the extension end, the position of the drive shaft in the front housing can be adjusted, thereby controlling the flow rate.

[0008] Compared with the prior art, the utility model has a simple structure, is convenient for assembly and maintenance, and can be adjusted steplessly.

[0009] As a further configuration of the utility model, the outer wall of the matching portion is truncated cone-shaped, the outer diameter of the matching portion away from the external thread is smaller than the outer diameter of the side close to the external thread, and the minimum outer diameter of the matching portion is larger than the minimum diameter of the clamping area.

[0010] By adopting the above solution, it is convenient for the rotating cylinder to be sleeved on the extension end, and it is convenient for the rotating cylinder to clamp the matching part.

[0011] As a further configuration of the utility model, a step surface 1 is provided on the side of the external thread away from the crack, which can form a limit with the end surface of the rotating cylinder away from the front shell.

[0012] By adopting the above solution, the moving range of the rotating drum on the extension end is controlled, which is convenient for the operator to adjust.

[0013] As a further configuration of the utility model, one end of the extension end away from the rear shell is provided with a second step surface which can form a limit with the end surface of the rotating cylinder away from the rear shell.

[0014] By adopting the above solution, the moving range of the rotating cylinder on the insertion end is controlled, which is convenient for the operator to adjust.

[0015] As a further configuration of the utility model, a scale is provided on the outer wall of the insertion end, and an extension direction of the scale is parallel to the axial direction of the insertion end.

[0016] The above solution is adopted to facilitate the operator to adjust the flow rate.

[0017] As a further configuration of the utility model, the outer wall of the rotating cylinder is in a polygonal column shape.

[0018] The above solution makes it convenient for the operator to rotate the rotating cylinder using tools such as a wrench.

[0019] As a further configuration of the utility model, an indicator mark is provided on a side of the rotating cylinder away from the rear shell body.

[0020] The above solution makes it convenient for the operator to determine the direction of the rotating drum, with indicators such as arrows, text, etc.

[0021] As a further configuration of the utility model, the reset structure includes a spring sleeved on the drive shaft, a step surface three arranged on the outer wall of the drive shaft and a step surface four arranged on the inner wall of the front shell body, the spring is arranged between the step surface three and the step surface four, and the two ends of the spring are respectively abutted against the step surface three and the step surface four.

[0022] The above solution has a simple structure and is convenient for assembly and later replacement.

[0023] The utility model is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 This is a schematic diagram of the front housing of a specific embodiment of the utility model;

[0025] Attached Figure 2 This is a schematic diagram of the rear housing of a specific embodiment of the utility model;

[0026] Attached Figure 3 This is a schematic diagram of a rotating drum in a specific embodiment of the utility model;

[0027] Attached Figure 4 It is a schematic cross-sectional view of an assembly of a specific embodiment of the utility model.

[0028] Front housing 1, through hole 1 11, through hole 2 12, matching port 13, rear housing 2, drive shaft 3, worm gear 31, eccentric shaft 4, reset structure 5, spring 51, step surface 3 52, step surface 4 53, insertion end 6, scale 61, step surface 2 62, extension end 7, matching portion 71, slit 72, external thread 73, step surface 1 74, rotating cylinder 8, internal thread 81, clamping area 82, indicator mark 83. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present utility model, it should be noted that, unless otherwise specified, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the orientation or position relationship in the description are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] The specific implementation of the present invention is as follows Figure 1-4 shown.

[0032] An oil pump used on a chain saw includes a front housing 1, a rear housing 2, a drive shaft 3, a worm gear 31 arranged on the drive shaft 3, an eccentric shaft 4 passing through the rear housing 2, and a reset structure 5 for keeping the end of the drive shaft 3 facing the eccentric shaft 4 in contact with the side wall of the eccentric shaft 4. The front housing 1 is provided with a through hole 11, a through hole 2 12 and a matching opening 13 corresponding to the worm gear 31.

[0033] The drive shaft 3 is located in both the front shell 1 and the rear shell 2. A cylindrical insertion end 6 is provided at the port of the front shell 1 facing the rear shell 2. A cylindrical extension end 7 for inserting the insertion end 6 is provided at the port of the rear shell 2 facing the front shell 1. The extension end 7 includes a mating portion 71 located on the side close to the front shell 1. The mating portion 71 is provided with at least one crack 72 extending in a direction away from the front shell 1. In this embodiment, four cracks are provided. An external thread 73 is provided on the outer wall of the extension end 7. The external thread 73 is located on the side of the mating portion 71 away from the front shell 1. A rotating cylinder 8 is provided on the outer sleeve of the extension end 7. The inner wall of the rotating cylinder 8 includes an internal thread 81 mating with the external thread 73 and a truncated cone-shaped clamping area 82 arranged on the side of the internal thread 81 close to the front shell 1. The diameter of the clamping area 82 away from the internal thread 81 is smaller than the diameter of the side close to the internal thread 81.

[0034] During assembly, first install the drive shaft 3 into the front housing 1, rotate the eccentric shaft 4 into the rear housing 2, and install other accessories together. Then, sleeve the rotating cylinder 8 on the insertion end 6, insert the insertion end 6 into the extension end 7, and after the insertion end 6 is inserted to a suitable position, move the rotating cylinder 8 to the extension end 7. During the mating process of the external thread 73 and the internal thread 81, the clamping area 82 clamps the mating portion 71 to close the crack 72, so that the mating portion 71 is tightly attached to the insertion end 6, thereby keeping the front housing 1 and the rear housing 2 fixed. By adjusting the insertion depth of the extension end 7, the position of the drive shaft 3 in the front housing 1 can be adjusted to control the flow rate. Compared with the prior art, the utility model has a simple structure, is convenient for assembly and maintenance, and can be adjusted steplessly.

[0035] The outer wall of the matching portion 71 is in a truncated cone shape, the outer diameter of the matching portion 71 away from the external thread 73 is smaller than the outer diameter of the side close to the external thread 73, and the minimum outer diameter of the matching portion 71 is larger than the minimum diameter of the clamping area 82. The shape of the matching portion 71 facilitates the rotating cylinder 8 to be sleeved on the extension end 7 and to facilitate the rotating cylinder 8 to clamp the matching portion 71.

[0036] A scale 61 is provided on the outer wall of the insertion end 6, and the extension direction of the scale 61 is parallel to the axial direction of the insertion end 6, so that the operator can adjust the flow conveniently.

[0037] The side of the external thread 73 away from the slit 72 is provided with a step surface 1 74 that can form a limit with the end surface of the rotating cylinder 8 away from the front housing 1. The end of the extension end 7 away from the rear housing 2 is provided with a step surface 2 62 that can form a limit with the end surface of the rotating cylinder 8 away from the rear housing 2. The step surface 1 74 can control the movement range of the rotating cylinder 8 on the extension end 7, and the step surface 2 62 can control the movement range of the rotating cylinder 8 on the insertion end 6, which is convenient for the operator to adjust.

[0038] The outer wall of the rotating cylinder 8 is in a polygonal column shape, which is convenient for an operator to rotate the rotating cylinder 8 by using tools such as a wrench.

[0039] An indicator mark 83 is provided on the side of the rotating drum 8 away from the rear housing 2 to facilitate the operator to determine the direction of the rotating drum 8.

[0040] The reset structure 5 includes a spring 51 sleeved on the drive shaft 3, a step surface 3 52 provided on the outer wall of the drive shaft 3, and a step surface 4 53 provided on the inner wall of the front housing 1. The spring 51 is provided between the step surface 3 52 and the step surface 4 53, and the two ends of the spring 51 are respectively in contact with the step surface 3 52 and the step surface 4 53. The structure is simple, and it is convenient for assembly and later replacement.

[0041] The present invention is not limited to the above-mentioned specific implementation modes. A person skilled in the art may adopt other various specific implementation modes to implement the present invention according to the contents disclosed in the present invention, or any design structure and concept of the present invention with simple changes or modifications shall fall within the protection scope of the present invention.

Claims

1. An oil pump used on a chain saw, comprising a housing, a drive shaft arranged in the housing, a worm gear arranged on the drive shaft, an eccentric shaft passing through the housing, and a reset structure for keeping the end of the drive shaft facing the eccentric shaft in contact with the side wall of the eccentric shaft, the housing being provided with a first through hole, a second through hole and a matching opening corresponding to the worm gear, characterized in that: The shell includes a front shell and a rear shell, the drive shaft is located in the front shell and the rear shell at the same time, the eccentric shaft is arranged in the rear shell, the front shell is provided with a cylindrical insertion end at the port facing the rear shell, and the rear shell is provided with a cylindrical extension end for the insertion end to be inserted at the port facing the front shell, the extension end includes a matching portion located on a side close to the front shell, the matching portion is provided with at least one crack extending in a direction away from the front shell, the outer wall of the extension end is provided with an external thread, the external thread is located on the side of the matching portion away from the front shell, the outer sleeve of the extension end is provided with a rotating cylinder, the inner wall of the rotating cylinder includes an internal thread matching the external thread and a truncated cone-shaped clamping area arranged on the side of the internal thread close to the front shell, the diameter of the clamping area away from the internal thread is smaller than the diameter of the side close to the internal thread.

2. The oil pump used in a chain saw according to claim 1, characterized in that: The outer wall of the matching portion is in a truncated cone shape, the outer diameter of the matching portion away from the external thread is smaller than the outer diameter of the matching portion close to the external thread, and the minimum outer diameter of the matching portion is larger than the minimum diameter of the clamping area.

3. The oil pump used in a chain saw according to claim 2, characterized in that: A step surface 1 is provided on the side of the external thread away from the crack and can form a limit with the end surface of the rotating cylinder away from the front shell.

4. The oil pump used in a chain saw according to claim 3, characterized in that: One end of the extension end away from the rear shell is provided with a second step surface which can form a limit with the end surface of the rotating cylinder away from the rear shell.

5. An oil pump for use on a chain saw according to claim 3 or 4, characterized in that: The outer wall of the insertion end is provided with scales, and the extension direction of the scales is parallel to the axial direction of the insertion end.

6. The oil pump used in a chain saw according to claim 5, characterized in that: The outer wall of the rotating cylinder is in a polygonal column shape.

7. The oil pump used in a chain saw according to claim 6, characterized in that: An indicator mark is arranged on a side of the rotating cylinder away from the rear shell body.

8. An oil pump for use on a chain saw according to claim 1 or 7, characterized in that: The reset structure includes a spring sleeved on the drive shaft, a step surface three arranged on the outer wall of the drive shaft and a step surface four arranged on the inner wall of the front shell body. The spring is arranged between the step surface three and the step surface four, and the two ends of the spring are respectively abutted against the step surface three and the step surface four.

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