Power structure for lubricating oil of sewing machine

Abstract

The utility model provides a power structure of sewing machine lubricating oil, and belongs to the technical field of sewing machines. The technical problem that an existing oil pumping structure of the sewing machine is short in service life is solved. According to the power structure of the sewing machine lubricating oil, a sewing machine comprises a main shaft and a shaft sleeve arranged on the periphery of the main shaft in a sleeving mode, the shaft sleeve is provided with a pump plug hole, an oil suction hole and an oil discharge hole which are communicated with an inner hole, the power structure comprises an eccentric groove formed in the peripheral face of the main shaft and a plunger inserted into the pump plug hole, and a pre-tightening stud is inserted into an outer end opening of the pump plug hole in a threaded connection mode. A pressure spring piece is arranged between the small end of the pre-tightening stud and the plunger in an abutting mode, the periphery of the pre-tightening stud is sleeved with a soft sealing ring, and the soft sealing ring is arranged between the large end of the pre-tightening stud and the shaft sleeve in an abutting mode in the axial direction of the pre-tightening stud. According to the utility model, the assembly stability is improved and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a power structure of lubricating oil for sewing machines. Background Art

[0002] During the use of the sewing machine, oil needs to be continuously supplied to the sewing machine to ensure lubrication and flexible operation of the sewing machine. However, the oil pump currently used is generally an external oil pump, which requires the installation of an independent oil pump assembly and has certain installation limitations.

[0003] The patent with application publication number CN106222903A discloses a direct-drive plunger oil pump for a sewing machine, which mainly includes an oil pump body, an oil pump body cover plate is arranged on the oil pump body, a pump body cavity is arranged in the oil pump body, an oil outlet channel, an oil inlet channel and a plunger cavity connected to the oil cavity are arranged on the oil pump body, an oil outlet joint is arranged on the oil outlet channel, an oil inlet joint is arranged on the oil inlet channel, and also includes a motor connected to the oil pump body, the motor core shaft extends into the pump body cavity and fills the entire pump body cavity, an eccentric groove for oil storage is arranged on the motor core shaft, a plunger is arranged in the plunger cavity, a plunger cover plate is arranged on the plunger cavity, the plunger is connected to the plunger cover plate through a plunger spring, and when the eccentric groove is below the plunger, the plunger completely overlaps with the eccentric groove.

[0004] The above structure utilizes the eccentric groove on the sewing machine drive shaft in conjunction with the plunger and the oil inlet and outlet channels to achieve the oil pumping effect. However, the continuous reciprocating motion and impact of the plunger may cause loosening or loss, and the insufficient elastic force of the plunger makes it difficult to fully discharge the lubricating oil in the eccentric groove. Summary of the invention

[0005] The utility model aims at the above problems existing in the prior art and provides a power structure of lubricating oil for a sewing machine. The technical problem to be solved by the utility model is: how to prolong the service life of the oil pump structure.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A power structure of lubricating oil for a sewing machine, the sewing machine comprising a main shaft and a sleeve sleeved on the outer circumference of the main shaft, the sleeve having a pump plug hole, an oil suction hole and an oil discharge hole connected to an inner hole, the power structure comprising an eccentric groove opened on the outer circumference of the main shaft and a plunger inserted in the pump plug hole, characterized in that a pre-tightening stud is threadedly inserted in the outer port of the pump plug hole, a compression spring is arranged between the small end of the pre-tightening stud and the plunger, a soft sealing ring is sleeved on the outer periphery of the pre-tightening stud, and the soft sealing ring is arranged between the large end of the pre-tightening stud and the sleeve along the axial direction of the pre-tightening stud.

[0008] The main shaft is the main transmission shaft of the sewing machine. The sleeve is mounted on the outer periphery of the main shaft. The pump plug hole in the sleeve is used to insert a movable plunger. The eccentric groove is arranged on the outer periphery of the main shaft. The inner end of the plunger contacts the outer surface of the main shaft and can extend into the eccentric groove. Specifically, during the rotation of the main shaft, when the inner end of the plunger is located at the deepest part of the eccentric groove, the eccentric groove begins to communicate with the inner port of the oil suction hole. As the main shaft rotates, the inner end of the plunger gradually extends out of the eccentric groove, and negative pressure is generated to suck the external lubricating oil into the space between the eccentric groove and the inner wall of the sleeve. The main shaft continues to rotate to separate the eccentric groove from the oil suction hole, and then gradually begins to communicate with the oil discharge hole. After that, the inner end of the plunger gradually begins to enter the eccentric groove and generates high pressure to pump the lubricating oil to the oil discharge hole that is still connected to the eccentric groove. The eccentric groove and the oil drain hole are separated to complete the oil pump circulation. The pre-tightening stud is threadedly inserted into the outer port of the pump plug hole, so that the compression spring is arranged between the small end of the pre-tightening stud and the plunger. At the same time, a soft sealing ring is sleeved on the periphery of the pre-tightening stud to rest between the large end of the pre-tightening stud and the shaft sleeve. In this way, the pre-tightening stud can hold the compression spring from the outside to stabilize it and act on the plunger. The soft sealing ring can be deformed during assembly to seal the pre-tightening stud and the pump plug hole and generate a reverse elastic force on the pre-tightening stud. While avoiding the lubricating oil from overflowing from the pump plug hole, the pre-tightening stud can be prevented from loosening by itself to a certain extent, which is beneficial to improving assembly stability and extending service life.

[0009] In the above-mentioned power structure of the sewing machine lubricating oil, the plunger has a countersunk hole at one end facing the pre-tightening stud, one end of the compression spring is located in the countersunk hole, the inner end of the pre-tightening stud has a positioning column arranged along the arrangement direction of the pump plug hole, and the other end of the compression spring is sleeved on the periphery of the positioning column. This helps to keep the position and force of the compression spring stable and accurate, avoid excessive partial wear of the plunger due to excessive eccentric load, and help to extend the service life.

[0010] In the above-mentioned power structure of the sewing machine lubricant, the outer port of the pump plug hole has a step hole arranged coaxially, the large end of the pre-tightening stud and the soft sealing ring are located in the step hole, and the large end face of the pre-tightening stud has a straight or cross-shaped adjustment groove. In this way, the inner wall of the step hole is conducive to providing more stable support for the soft sealing ring, and the large end of the pre-tightening stud is built into the step hole to reduce the probability of the outer periphery of the sleeve interfering with the surrounding components and affecting the position of the pre-tightening stud. The adjustment groove is also conducive to the user using tools to operate the pre-tightening stud from the outside during assembly and maintenance.

[0011] In the above sewing machine lubricant power structure, the eccentric grooves are multiple and arranged in a spaced relationship along the axial direction of the main shaft, and the oil suction holes, oil discharge holes, plungers and pre-tightening studs are multiple and arranged in a spaced relationship along the axial direction of the sleeve. In this way, multiple groups of oil pumping units are arranged in a spaced relationship along the axial direction, so that the oil pumping states of each unit are synchronized when the main shaft rotates, and the oil pumping amount is increased while avoiding the pressure relief caused by the oil pressure difference between each unit that affects the oil pumping effect.

[0012] In the above sewing machine lubricating oil power structure, sealing rings are provided between the two ends of the sleeve and the main shaft, which helps to ensure that the lubricating oil will not leak out from between the main shaft and the sleeve during the oil pumping process, and ensures the internal pressure is stable.

[0013] Compared with the prior art, the advantages of the utility model are as follows:

[0014] The power structure of the sewing machine lubricating oil makes the tightening effect of the pre-tightening stud on the compression spring return part more stable and reliable, can solve the problem of insufficient plunger elasticity affecting the oil pumping effect, and prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of this embodiment.

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of this embodiment after the shaft sleeve is hidden.

[0018] In the figure, 1, main shaft; 11, eccentric slot;

[0019] 2. Shaft sleeve; 21. Pump plug hole; 211. Step hole; 22. Oil suction hole; 23. Oil discharge hole;

[0020] 3. Plunger; 31. Countersunk hole;

[0021] 4. Pre-tightening stud; 41. Positioning column; 42. Adjustment slot;

[0022] 5. Compression spring; 6. Sealing ring; 7. Soft sealing ring. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figure 1-3As shown, in the power structure of the lubricating oil of the sewing machine, the sewing machine includes a main shaft 1 and a sleeve 2 sleeved on the outer periphery of the main shaft 1, the sleeve 2 is provided with a pump plug hole 21 connected to the inner hole, an oil suction hole 22 and an oil discharge hole 23, and the specific relative position relationship thereof can refer to the prior art, the power structure includes an eccentric groove 11 opened on the outer peripheral surface of the main shaft 1 and a plunger 3 inserted in the pump plug hole 21, a pre-tightening stud 4 is threadedly inserted in the outer port of the pump plug hole 21, a compression spring 5 is arranged between the small end of the pre-tightening stud 4 and the plunger 3, an annular soft sealing ring 7 is sleeved on the outer periphery of the pre-tightening stud 4, a step hole 211 is opened at the outer port of the pump plug hole 21, the soft sealing ring 7 is arranged between the large end of the pre-tightening stud 4 and the inner wall of the step hole 211, after the pre-tightening stud 4 is installed, the soft sealing ring 7 can be compressed to produce a certain deformation to provide a preliminary pre-tightening force to prevent loosening. The spindle 1 is the main transmission shaft of the sewing machine. The sleeve 2 is sleeved on the outer periphery of the spindle 1. The pump plug hole 21 in the sleeve 2 is used to insert a movable plunger 3. The eccentric groove 11 is arranged on the outer periphery of the spindle 1. The inner end of the plunger 3 contacts the outer surface of the spindle 1 and can extend into the eccentric groove 11. Specifically, during the rotation of the spindle 1, when the inner end of the plunger 3 is located at the deepest part of the eccentric groove 11, the eccentric groove 11 begins to communicate with the inner port of the oil suction hole 22. As the spindle 1 rotates, the inner end of the plunger 3 gradually extends out of the eccentric groove 11, generating negative pressure to suck the external lubricating oil into the space between the eccentric groove 11 and the inner wall of the sleeve 2. The spindle 1 continues to rotate to separate the eccentric groove 11 from the oil suction hole 22, and then gradually begins to communicate with the oil discharge hole 22. The hole 23 is connected, and then the inner end of the plunger 3 gradually begins to enter the eccentric groove 11 and generates high pressure to pump the lubricating oil into the oil discharge hole 23 which is still connected to the eccentric groove 11. When the inner end of the plunger 3 slides to the deepest part of the eccentric groove 11, the eccentric groove 11 and the oil discharge hole 23 are separated to complete the oil pumping cycle; by threading and inserting the pre-tightening stud 4 in the outer port of the pump plug hole 21, the compression spring 5 is arranged between the inner end of the pre-tightening stud 4 and the plunger 3. In this way, under the condition of ensuring that the plunger 3 fluctuates with the inner wall of the eccentric groove 11, the abutting state of the pre-tightening stud 4 is more stable and will not loosen by itself. At the same time, it is ensured that the lubricating oil pressure will not leak out, and the oil pumping effect of the plunger 3 can be maintained for a long time, thereby extending the service life. Specifically, the end of the plunger 3 facing the preload stud 4 has a countersunk hole 31, one end of the compression spring 5 is located in the countersunk hole 31, the inner end of the preload stud 4 has a positioning column 41 arranged along the arrangement direction of the pump plug hole 21, and the other end of the compression spring 5 is sleeved on the periphery of the positioning column 41. This helps to keep the position and force of the compression spring 5 stable and accurate, avoid excessive partial load on the plunger 3 and cause excessive local wear, and help to extend the service life. The large end face of the preload stud 4 has a straight adjustment groove 42, which can be used by the user to perform maintenance operations and adjustments on the preload stud 4 from the outside to maintain the preload effect and ensure the stability of the plunger function. There are two eccentric grooves 11, which are opposite and spaced along the axial direction of the main shaft 1, and the oil suction hole 22, the oil discharge hole 23, the plunger 3 and the preload stud 4 all have two opposite and spaced along the axial direction of the sleeve 2.In this way, multiple groups of oil pumping units are arranged axially opposite to each other, so that the oil pumping status of each unit is synchronized when the main shaft 1 rotates, and the oil pumping amount is increased while avoiding the pressure relief caused by the oil pressure difference between the units that affects the oil pumping effect. A sealing ring 6 is provided between the two ends of the sleeve 2 and the main shaft 1. This helps to ensure that the lubricating oil will not leak out from between the main shaft 1 and the sleeve 2 during the oil pumping process, and ensures the stability of the internal pressure. The radial size of the inner end port of the oil suction hole 22 is larger than the radial size of the inner end port of the oil discharge hole 23. This helps to make the oil intake of the oil suction hole 22 smoother, and at the same time, it increases the initial oil discharge speed and pressure when the lubricating oil enters the oil discharge hole 23.

[0025] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A power structure for lubricating oil of a sewing machine, the sewing machine comprising a main shaft (1) and a sleeve (2) sleeved on the outer circumference of the main shaft (1), the sleeve (2) having a pump plug hole (21) connected to an inner hole, an oil suction hole (22) and an oil discharge hole (23), the power structure comprising an eccentric groove (11) formed on the outer circumference of the main shaft (1) and a plunger (3) inserted into the pump plug hole (21), characterized in that: A pre-tightening stud (4) is threadedly inserted into the outer end of the pump plug hole (21); a compression spring (5) is arranged between the small end of the pre-tightening stud (4) and the plunger (3); a soft sealing ring (7) is arranged around the outer sleeve of the pre-tightening stud (4); and the soft sealing ring (7) is arranged between the large end of the pre-tightening stud (4) and the shaft sleeve (2) along the axial direction of the pre-tightening stud (4).

2. The power structure of the sewing machine lubricating oil according to claim 1, characterized in that: The plunger (3) has a countersunk hole (31) at one end facing the pre-tightening stud (4), one end of the compression spring (5) is located in the countersunk hole (31), the inner end of the pre-tightening stud (4) has a positioning column (41) arranged along the arrangement direction of the pump plug hole (21), and the other end of the compression spring (5) is sleeved on the periphery of the positioning column (41).

3. The power structure of the sewing machine lubricating oil according to claim 1 or 2, characterized in that: The outer end of the pump plug hole (21) is provided with a coaxially arranged stepped hole (211), the large end of the pre-tightening stud (4) and the soft sealing ring (7) are located in the stepped hole (211), and the large end surface of the pre-tightening stud (4) is provided with a straight or cross-shaped adjustment groove (42).

4. The power structure of the sewing machine lubricating oil according to claim 1 or 2, characterized in that: The eccentric grooves (11) are provided in plurality and are arranged in opposition and at intervals along the axial direction of the main shaft (1); the oil suction holes (22), the oil discharge holes (23), the plunger (3) and the pre-tightening studs (4) are provided in plurality and are arranged in opposition and at intervals along the axial direction of the shaft sleeve (2).

5. The power structure of the sewing machine lubricating oil according to claim 4, characterized in that: Sealing rings (6) are provided between the two ends of the shaft sleeve (2) and the main shaft (1).

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