Lower shaft sleeve of sewing machine and sewing machine

Abstract

The utility model provides a lower shaft sleeve of a sewing machine and the sewing machine, and belongs to the technical field of sewing equipment. The shaft sleeve comprises a cylinder body, the cylinder body is provided with an inner cavity, an oil inlet channel and an oil outlet channel are formed in the cylinder body, the oil inlet channel and the oil outlet channel are both communicated with the inner cavity of the cylinder body, and an oil passing channel is further formed in the cylinder body and communicated with the oil inlet channel and the oil outlet channel. According to the shaft sleeve, the oil inlet channel and the oil outlet channel are communicated through the oil passing channel, an oil discharge path is added, redundant lubricating oil can be conveniently discharged, and the oil discharge efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of sewing equipment technology, and relates to a lower shaft bushing of a sewing machine and a sewing machine. Background Technology

[0002] The sewing machine has an upper shaft and a lower shaft, with a bushing fitted inside the lower shaft. The lower shaft and the bushing can rotate relative to each other. During use, lubricating oil needs to be added to the inner cavity of the bushing to lubricate the lower shaft. For information on the structure of the bushing and the connection structure between the bushing and the lower shaft, please refer to the patent document with application number 201320436627.2, which provides a bushing for the lower shaft of a direct-drive sewing machine.

[0003] In the prior art, lubricating oil enters the inner cavity of the bushing through the oil inlet hole. As the lower shaft rotates relative to the bushing, the lubricating oil lubricates the lower shaft. When the lower shaft rotates, excess lubricating oil in the inner cavity is squeezed out through the oil outlet hole to achieve oil discharge. The drawback is that the oil discharge efficiency is low. Summary of the Invention

[0004] This utility model addresses the aforementioned problems in the existing technology by providing a lower shaft bushing for a sewing machine. The technical problem this utility model aims to solve is: how to improve oil drainage efficiency.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A lower shaft bushing for a sewing machine, the bushing comprising a cylindrical body having an inner cavity, an oil inlet channel and an oil outlet channel being provided on the cylindrical body, the oil inlet channel and the oil outlet channel being connected to the inner cavity of the cylindrical body, characterized in that the cylindrical body also has an oil passage channel being provided, the oil passage channel being connected to the oil inlet channel and the oil outlet channel.

[0007] The bushing is fitted onto the lower shaft, which is located within the inner cavity of the bushing. Lubricating oil enters the inner cavity of the bushing through the oil inlet channel. As the lower shaft and bushing rotate relative to each other, the lubricating oil lubricates the lower shaft. When the lower shaft rotates, excess lubricating oil in the inner cavity is squeezed out through the oil outlet channel, thus achieving oil discharge. Furthermore, excess lubricating oil can also pass through the oil passage from the oil inlet channel to the oil outlet channel and then be discharged, significantly improving oil discharge efficiency.

[0008] This bushing connects the oil inlet and outlet channels through an oil passage, adding an oil drainage path and facilitating the discharge of excess lubricating oil, thus improving drainage efficiency.

[0009] In the lower shaft sleeve of the sewing machine described above, the flow rate of the oil inlet channel is less than the flow rate of the oil outlet channel.

[0010] The flow rate of the oil outlet channel is greater than that of the oil inlet channel. Excess lubricating oil in the oil inlet channel can be more easily discharged after passing through the oil outlet channel, thus further improving the oil discharge efficiency.

[0011] In the lower shaft sleeve of the sewing machine described above, the oil passage is cylindrical.

[0012] The straight-cylindrical oil passage is shorter, which shortens the oil outlet path and allows the oil to be discharged more quickly.

[0013] In the lower shaft sleeve of the sewing machine described above, the entire oil passage is located inside the cylinder wall of the cylinder body, and one end of the oil passage is connected to the oil inlet passage and the oil outlet passage, respectively.

[0014] The oil passage is located inside the cylinder wall. One end of the oil passage is connected to the oil inlet passage, and the other end is connected to the oil outlet passage. This added oil discharge path does not need to pass through the inner cavity of the cylinder, which makes oil discharge more convenient and faster.

[0015] In the lower shaft sleeve of the sewing machine described above, the outer end of the oil inlet channel has an oil inlet, and the diameter of the oil inlet gradually increases from the inside to the outside.

[0016] The oil inlet is designed with a larger outer diameter and a smaller inner diameter, making it easier for lubricating oil to enter the oil inlet channel.

[0017] In the lower shaft sleeve of the sewing machine described above, the outer end of the oil outlet channel has an oil outlet, and the diameter of the oil outlet gradually increases from the inside to the outside.

[0018] The oil outlet is designed with a larger outer diameter and a smaller inner diameter, allowing lubricating oil to be discharged more easily from the oil outlet channel.

[0019] This utility model also provides a sewing machine, which includes any of the above-mentioned lower shaft bushings.

[0020] Compared with the prior art, the advantages of this utility model are as follows:

[0021] 1. This bushing connects the oil inlet and outlet channels through an oil passage, adding an oil drainage path and facilitating the discharge of excess lubricating oil, thus improving drainage efficiency.

[0022] 2. The flow rate of the oil outlet channel of this bushing is greater than that of the oil inlet channel. Excess lubricating oil in the oil inlet channel can be discharged more easily after passing through the oil outlet channel, which greatly improves the oil discharge efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this bushing;

[0024] Figure 2 This is a sectional view of the bushing.

[0025] In the diagram: 1. Cylinder body, 2. Inner cavity, 3. Oil inlet channel, 4. Oil outlet channel, 5. Oil passage channel, 6. Oil inlet, 7. Oil outlet. Detailed Implementation

[0026] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1-2 As shown, this bushing includes a cylindrical body 1, which has an inner cavity 2. An oil inlet channel 3 and an oil outlet channel 4 are provided on the cylindrical body 1. Both the oil inlet channel 3 and the oil outlet channel 4 are connected to the inner cavity 2 of the cylindrical body 1. An oil passage channel 5 is also provided in the cylindrical body 1. The oil passage channel 5 is connected to the oil inlet channel 3 and also to the oil outlet channel 4.

[0028] The bushing is fitted onto the lower shaft, which is located within the inner cavity 2 of the bushing. Lubricating oil enters the inner cavity 2 of the bushing through the oil inlet channel 3. During the relative rotation of the lower shaft and the bushing, the lubricating oil lubricates the lower shaft. When the lower shaft rotates, excess lubricating oil in the inner cavity 2 is squeezed out through the oil outlet channel 4, thus achieving oil discharge. In addition, excess lubricating oil can also pass through the oil inlet channel 3 and the oil passage channel 5, directly entering the oil outlet channel 4 and then being discharged, which greatly improves the oil discharge efficiency.

[0029] Preferably, the flow rate of the oil inlet channel 3 is less than the flow rate of the oil outlet channel 4.

[0030] The flow rate of the oil outlet channel 4 is greater than that of the oil inlet channel 3. Excess lubricating oil in the oil inlet channel 3 can be more easily discharged after passing through the oil passage 5 into the oil outlet channel 4, thus further improving the oil discharge efficiency.

[0031] In addition, this structure has a small oil inlet and a large oil outlet, which can better control the amount of oil in the inner cavity 2 of the cylinder 1.

[0032] As one embodiment, the oil passage 5 is cylindrical.

[0033] The short, straight-cylindrical oil passage 5 shortens the oil outlet path and allows the oil to be discharged more quickly.

[0034] like Figure 2 As shown, in this embodiment, the entire oil passage 5 is located inside the cylinder wall of the cylinder 1, and one end of the oil passage 5 is connected to the oil inlet passage 3 and the oil outlet passage 4, respectively.

[0035] The oil passage 5 is located inside the cylinder wall. One end of the oil passage 5 is connected to the oil inlet passage 3, and the other end of the oil passage 5 is connected to the oil outlet passage 4. This added oil discharge path does not need to pass through the inner cavity 2 of the cylinder 1, which makes oil discharge more convenient and faster.

[0036] like Figure 1 As shown, in this embodiment, the outer end of the oil inlet channel 3 has an oil inlet 6, and the diameter of the oil inlet 6 gradually increases from the inside to the outside.

[0037] The oil inlet 6 is designed with a larger outer diameter and a smaller inner diameter, making it easier for lubricating oil to enter the oil inlet channel 3.

[0038] like Figure 1 As shown, in this embodiment, the outer end of the oil outlet channel 4 has an oil outlet 7, and the diameter of the oil outlet 7 gradually increases from the inside to the outside.

[0039] With an oil outlet 7 that is larger on the outside and smaller on the inside, lubricating oil can be discharged more easily from the oil outlet channel 4.

[0040] This utility model also provides a sewing machine, which includes any of the above-mentioned lower shaft bushings.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A lower shaft bushing for a sewing machine, the bushing comprising a cylindrical body (1), the cylindrical body (1) having an inner cavity (2), an oil inlet channel (3) and an oil outlet channel (4) provided on the cylindrical body (1), the oil inlet channel (3) and the oil outlet channel (4) being connected to the inner cavity (2) of the cylindrical body (1), characterized in that, The cylinder (1) also has an oil passage (5) which is connected to the oil inlet passage (3) and the oil outlet passage (4).

2. The lower shaft bushing of a sewing machine according to claim 1, characterized in that, The flow rate of the oil inlet channel (3) is less than the flow rate of the oil outlet channel (4).

3. The lower shaft bushing of a sewing machine according to claim 1, characterized in that, The oil passage (5) is cylindrical.

4. A lower shaft bushing for a sewing machine according to claim 1, 2, or 3, characterized in that, The entire oil passage (5) is located inside the cylinder wall of the cylinder body (1), and one end of the oil passage (5) is connected to the oil inlet passage (3) and the oil outlet passage (4) respectively.

5. A lower shaft bushing for a sewing machine according to claim 1, 2, or 3, characterized in that, The outer end of the oil inlet channel (3) has an oil inlet (6), and the diameter of the oil inlet (6) gradually increases from the inside to the outside.

6. The lower shaft bushing of a sewing machine according to claim 5, characterized in that, The outer end of the oil outlet channel (4) has an oil outlet (7), and the diameter of the oil outlet (7) gradually increases from the inside to the outside.

7. A sewing machine, characterized in that, The sewing machine includes a lower shaft bushing as described in any one of claims 1-6.

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