Working head with oil leakage prevention structure

Abstract

The utility model discloses a working head with anti -leakage oil structure, including head shell and intermediate cover, be equipped with the oil seal spare for sealing both of them between head shell and intermediate cover, be equipped with the deceleration output assembly in head shell and intermediate cover, and deceleration output assembly includes spindle, be equipped with with its rotary connection gets output shaft on head shell, be equipped with the first sealing element for sealing between output shaft and head shell, be equipped with the second sealing element for sealing in intermediate cover, second sealing element is close to the opening end setting of intermediate cover. The utility model discloses through setting up oil seal spare on head shell and intermediate cover, sets up the first sealing element between intermediate cover and output shaft, and the working head whole sealing is better and works more stable.

Description

Technical Field

[0001] This utility model belongs to the technical field of power tool accessories, specifically relating to a working head with an oil-leakage-proof structure. Background Technology

[0002] An electric wrench is a common power tool, generally consisting of the main body of the power tool and a working head, which is detachably connected to the main body of the power tool. The main body of the power tool contains a power source, which is a drive motor. When the drive motor is working, it drives the reduction output component in the working head to rotate, thereby driving the striking part to reciprocate to strike the output shaft. The patent document with publication number CN218285328U discloses a high initial torque anti-disengagement electric wrench, including a housing, a motor disposed within the housing, and a head shell assembly connected to the front end of the housing. The head shell assembly includes a head shell, a square shaft, an impact seat, a central shaft, and a gearbox rear cover. The gearbox rear cover is installed at the rear end of the head shell and forms a receiving cavity with the head shell. The square shaft, impact seat, and central shaft are assembled within the receiving cavity. The motor is an external rotor brushless motor. The rear end of the head shell has a plug-in part, and the front end of the housing has an insertion port for inserting the plug-in part. When the plug-in part is inserted into the housing, the head shell is fixedly connected to the housing by bolts. An anti-disengagement part protrudes from the outer wall of the plug-in part or the inner wall of the housing. An abutment edge that cooperates with the anti-disengagement part is provided on the inner wall of the housing or the outer wall of the plug-in part. The anti-disengagement part abuts against the abutment edge to prevent the head shell from disengaging from the housing. Existing electric wrench headstock assemblies include the headstock and gearbox rear cover. The sealing of the headstock and gearbox rear cover is poor. Since lubricating oil is often added inside the headstock assembly to lubricate the components, the reduction mechanism and striking mechanism often generate heat during operation, diluting the lubricating oil. This causes the lubricating oil to leak out from the gaps in the headstock assembly, preventing it from circulating and lubricating the components, resulting in poor stability of the power tool. Therefore, a working head with a leak-proof structure is needed to overcome these difficulties. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by designing a working head with an oil-leakage prevention structure. By setting oil seals on the head shell and the intermediate cover, and setting a first seal between the intermediate cover and the output shaft, the working head achieves better overall sealing and more stable operation.

[0004] The objective of this invention is achieved through the following technical solution: a working head with an oil-leakage-proof structure, comprising a head shell and an intermediate cover, wherein an oil seal is provided between the head shell and the intermediate cover for sealing both; a speed reduction output assembly is provided within the head shell and the intermediate cover, the speed reduction output assembly comprising a main shaft, and an output shaft is provided on the head shell for rotatably connected thereto; an impact member is provided between the main shaft and the output shaft, and a first sealing member is provided between the output shaft and the head shell for sealing; a second sealing member is provided within the intermediate cover for sealing, the second sealing member being disposed near the opening end of the intermediate cover.

[0005] Preferably, the head shell and the intermediate cover are fixedly connected by screws; the head shell is provided with a first hole for inserting the screw, the intermediate cover is provided with a second hole for inserting the screw, and the oil seal is provided with a third hole for inserting the screw; the first hole, the second hole and the third hole are coaxially arranged.

[0006] Preferably, the inner diameter of the first hole is the same as the inner diameter of the second hole, and the inner diameter of the third hole is adapted to the inner diameter of the first hole.

[0007] Preferably, the intermediate cover has an annular protrusion and the head shell has an annular groove; when the intermediate cover is installed on the head shell, the annular protrusion is located in the annular groove.

[0008] Preferably, the outer contours of the annular protrusion and the annular groove are adapted to each other; an oil seal is fitted onto the annular protrusion, and the outer contour of the annular protrusion is adapted to the inner contour of the oil seal; when the intermediate cover is installed on the head shell, the oil seal is clamped between the intermediate cover and the head shell.

[0009] By providing a third hole on the oil seal, the head shell and intermediate cover can be easily positioned during fixing. This third hole also prevents screws from passing through the oil seal, ensuring its integrity. The annular groove and annular protrusion facilitate the positioning and installation of the head shell and intermediate cover. The head shell and intermediate cover can be tightly assembled, and the oil seal is stably fitted between them, resulting in better overall sealing of the working head.

[0010] Preferably, one end of the spindle is connected to the power source of the power tool, and the other end of the spindle is connected to the output shaft. The spindle and the output shaft rotate synchronously. The striking element is sleeved and installed on the spindle, and a return spring is provided between the striking element and the step of the spindle. A positioning sleeve is provided between the output shaft and the head shell, and the positioning sleeve is arranged adjacent to the first seal.

[0011] Preferably, the head shell is provided with a first mounting groove and a second mounting groove arranged adjacent to each other. A first sealing element is provided in the first mounting groove, and a positioning sleeve is provided in the second mounting groove. The internal contour of the first mounting groove is adapted to the external contour of the first sealing element, and the internal contour of the second mounting groove is adapted to the external contour of the positioning sleeve. A gasket is provided between the positioning sleeve and the protrusion of the output shaft, and the outer diameter of the gasket is larger than the outer diameter of the output shaft. The protrusion of the output shaft is arranged adjacent to the protrusion on the striking element.

[0012] Preferably, the intermediate cover is connected to the main body of the power tool, and the intermediate cover is provided with an annular limiting groove, and the annular limiting groove is provided with a second sealing element; the outer contour of the annular limiting groove is adapted to the outer contour of the second sealing element, and the second sealing element is disposed between the intermediate cover and the power source of the power tool.

[0013] When using the working head, connect it to the power tool, with the intermediate cover fixed to the power tool body. The power tool contains a power source, specifically a drive motor. The motor shaft of the drive motor passes through the intermediate cover and extends to the main shaft. When the drive motor operates, it drives the main shaft to rotate, which in turn drives the output shaft. The main shaft is equipped with a striking element and a return spring. The protrusion of the striking element is adjacent to the protrusion of the output shaft. When the main shaft rotates, the striking element reciprocates and strikes the output shaft. The reduction output assembly driving the striking element to strike the output shaft is a conventional structure in existing power wrenches and will not be discussed further here. Because a positioning sleeve is provided between the output shaft and the head housing, the output shaft rotates more smoothly and with better concentricity. The positioning sleeve and the output shaft compress the first seal, thus providing better sealing at the opening of the head housing and preventing lubricant leakage. By providing a first mounting groove and a second mounting groove, the positioning sleeve and the first seal are more securely installed, preventing axial movement of the first seal and the positioning sleeve relative to the head housing, resulting in better overall sealing.

[0014] By setting a second seal in the annular limiting groove of the intermediate cover, the connection between the intermediate cover and the power source of the power tool is sealed, preventing lubricating oil from flowing into the power tool along the intermediate cover.

[0015] Compared with the prior art, the present invention has the following advantages: 1. An oil seal is provided between the head shell and the intermediate cover to prevent the lubricating oil in the working head from overflowing, the lubricating oil can be recycled, the working head has better sealing performance and more stable operation; 2. By providing a first seal between the head shell and the output shaft, and limiting the first seal by the positioning bushing, the opening end of the head shell has good sealing performance; 3. By providing a second seal on the intermediate cover, the intermediate cover and the main body of the power tool have better sealing performance. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present utility model;

[0017] Figure 2 This is a perspective view of the present invention from another angle;

[0018] Figure 3 This is a diagram of the internal structure of the present invention;

[0019] Figure 4 This is a 3D view of the oil seal component;

[0020] Figure 5 Exploded view of the head shell, middle cover and oil seal in a semi-sectional state;

[0021] The markings in the diagram are: 1. Head shell; 2. Intermediate cover; 3. Oil seal; 4. Reduction output assembly; 41. Main shaft; 42. Impact component; 43. Return spring; 5. Output shaft; 6. First seal; 7. Second seal; 8. First hole; 9. Second hole; 10. Third hole; 11. Annular protrusion; 12. Annular groove; 13. Positioning bushing; 14. First mounting groove; 15. Second mounting groove; 16. Annular limiting groove; 17. Gasket. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0023] like Figures 1 to 5 As shown, this embodiment discloses a working head with an oil-leakage prevention structure, including a head shell 1 and an intermediate cover 2, with an oil seal 3 between the head shell 1 and the intermediate cover 2 for sealing both; a deceleration output assembly 4 is provided inside the head shell 1 and the intermediate cover 2, the deceleration output assembly 4 including a main shaft 41, and an output shaft 5 rotatably connected to the head shell 1; an impact member 42 is provided between the main shaft 41 and the output shaft 5, and a first sealing member 6 is provided between the output shaft 5 and the head shell 1 for sealing; a second sealing member 7 is provided inside the intermediate cover 2 for sealing, and the second sealing member 7 is located near the opening end of the intermediate cover 2.

[0024] The head shell 1 and the intermediate cover 2 are fixedly connected by screws. The head shell 1 has a first hole 8 for inserting screws, the intermediate cover 2 has a second hole 9 for inserting screws, and the oil seal 3 has a third hole 10 for inserting screws. The first hole 8, the second hole 9, and the third hole 10 are coaxially arranged. The inner diameter of the first hole 8 is the same as the inner diameter of the second hole 9, and the inner diameter of the third hole 10 is compatible with the inner diameter of the first hole 8. The intermediate cover 2 has an annular protrusion 11, and the head shell 1 has an annular groove 12. When the intermediate cover 2 is installed on the head shell 1, the annular protrusion 11 is located in the annular groove 12. The outer contour of the annular protrusion 11 and the outer contour of the annular groove 12 are adapted to each other; an oil seal 3 is sleeved on the annular protrusion 11, and the outer contour of the annular protrusion 11 and the inner contour of the oil seal 3 are adapted to each other; when the intermediate cover 2 is installed on the head shell 1, the oil seal 3 is clamped between the intermediate cover 2 and the head shell 1.

[0025] One end of the spindle 41 is connected to the power source of the power tool, and the other end of the spindle 41 is connected to the output shaft 5. The spindle 41 and the output shaft 5 rotate synchronously. The striking member 42 is sleeved on the spindle 41, and a return spring 43 is provided between the striking member 42 and the step of the spindle 41. A positioning sleeve 13 is provided between the output shaft 5 and the head shell 1, and the positioning sleeve 13 is arranged adjacent to the first seal 6. The head shell 1 is provided with a first mounting groove 14 and a second mounting groove 15 arranged adjacent to each other. The first mounting groove 14 is provided with the first seal 6, and the second mounting groove 15 is provided with the positioning sleeve 13. The internal contour of the first mounting groove 14 is adapted to the external contour of the first seal 6, and the internal contour of the second mounting groove 15 is adapted to the external contour of the positioning sleeve 13. A gasket 17 is provided between the positioning sleeve 13 and the protrusion of the output shaft 5. The outer diameter of the gasket 17 is larger than the outer diameter of the output shaft 5. The protrusion of the output shaft 5 is arranged adjacent to the protrusion on the striking member 42. The intermediate cover 2 is connected to the main body of the power tool. The intermediate cover 2 is provided with an annular limiting groove 16, and the annular limiting groove 16 is provided with a second sealing element 7. The outer contour of the annular limiting groove 16 is adapted to the outer contour of the second sealing element 7. The second sealing element 7 is disposed between the intermediate cover 2 and the power source of the power tool.

[0026] The specific operation process of this embodiment is as follows: install the output shaft 5, the positioning bushing 13 and the first seal 6 on the head shell 1, and then install the deceleration output assembly 4 between the head shell 1 and the intermediate cover 2; install the oil seal 3 on the annular protrusion 11 of the intermediate cover 2, and align the first hole 8, the second hole 9 and the third hole 10 with each other; finally, fix the head shell 1 and the intermediate cover 2 with screws.

[0027] By providing a third hole 10 on the oil seal 3, the oil seal 3 can be easily positioned when the head shell 1 and the intermediate cover 2 are fixed. The third hole 10 also prevents screws from passing through the oil seal 3, ensuring its integrity. The annular groove 12 and annular protrusion 11 facilitate the positioning and installation of the head shell 1 and the intermediate cover 2. The head shell 1 and the intermediate cover 2 can be tightly assembled, and the oil seal 3 is stably fitted between the head shell 1 and the intermediate cover 2, resulting in better overall sealing of the working head. When using the working head, connect the working head to the power tool, with the intermediate cover 2 fixed to the power tool body. The power tool contains a power source, specifically a drive motor. The motor shaft of the drive motor passes through the intermediate cover 2 and extends to the main shaft 41. When the drive motor operates, it drives the main shaft 41 to rotate, which in turn drives the output shaft 5 to rotate. The main shaft 41 is equipped with a striking element 42 and a return spring 43. The protrusion of the striking element 42 is adjacent to the protrusion of the output shaft 5. When the main shaft 41 rotates, the striking element 42 reciprocates by striking the output shaft 5. The deceleration output assembly 4 driving the striking element 42 to strike the output shaft 5 is a conventional structure of existing electric wrenches and will not be discussed further here. Because a positioning sleeve 13 is provided between the output shaft 5 and the head shell 1, the rotation of the output shaft 5 is smoother and more concentric. The positioning sleeve 13 and the output shaft 5 compress the first seal 6, thus providing better sealing at the opening of the head shell 1 and preventing lubricant leakage. By setting the first mounting groove 14 and the second mounting groove 15, the positioning bushing 13 and the first seal 6 are installed more firmly, preventing the first seal 6 and the positioning bushing 13 from moving axially relative to the head shell 1, and the overall sealing performance is better.

[0028] 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 replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A working head having an oil leakage prevention structure, comprising a head case (1) and an intermediate cover (2), characterized in that, An oil seal (3) for sealing both is provided between the head shell (1) and the intermediate cover (2); a deceleration output assembly (4) is provided inside the head shell (1) and the intermediate cover (2), the deceleration output assembly (4) includes a main shaft (41), and an output shaft (5) is provided on the head shell (1) and rotatably connected thereto; an impact member (42) is provided between the main shaft (41) and the output shaft (5), and a first seal (6) for sealing is provided between the output shaft (5) and the head shell (1); a second seal (7) for sealing is provided inside the intermediate cover (2), and the second seal (7) is located near the opening end of the intermediate cover (2).

2. The working head with an oil-leakage-proof structure according to claim 1, characterized in that, The head shell (1) and the intermediate cover (2) are fixedly connected by screws; the head shell (1) is provided with a first hole (8) for inserting screws, the intermediate cover (2) is provided with a second hole (9) for inserting screws, and the oil seal (3) is provided with a third hole (10) for inserting screws; the first hole (8), the second hole (9) and the third hole (10) are coaxially arranged.

3. The working head with an oil-leakage-proof structure according to claim 2, characterized in that, The inner diameter of the first hole (8) is the same as the inner diameter of the second hole (9), and the inner diameter of the third hole (10) is compatible with the inner diameter of the first hole (8).

4. The working head with an oil-leakage-proof structure according to claim 2, characterized in that, The intermediate cover (2) is provided with an annular protrusion (11), and the head shell (1) is provided with an annular groove (12); when the intermediate cover (2) is installed on the head shell (1), the annular protrusion (11) is set in the annular groove (12).

5. The working head with an oil-leakage-proof structure according to claim 4, characterized in that, The outer contour of the annular protrusion (11) and the outer contour of the annular groove (12) are adapted to each other; an oil seal (3) is fitted on the annular protrusion (11), and the outer contour of the annular protrusion (11) and the inner contour of the oil seal (3) are adapted to each other; when the intermediate cover (2) is installed on the head shell (1), the oil seal (3) is clamped between the intermediate cover (2) and the head shell (1).

6. The working head with an oil-leakage-proof structure according to claim 1, characterized in that, One end of the spindle (41) is connected to the power source of the power tool, and the other end of the spindle (41) is connected to the output shaft (5). The spindle (41) and the output shaft (5) rotate synchronously. The striking member (42) is sleeved on the spindle (41), and a return spring (43) is provided between the step of the striking member (42) and the spindle (41). A positioning bushing (13) is provided between the output shaft (5) and the head shell (1). The positioning bushing (13) is arranged adjacent to the first seal (6).

7. The working head with an oil-leakage-proof structure according to claim 6, characterized in that, The head shell (1) is provided with a first mounting groove (14) and a second mounting groove (15) arranged adjacent to each other. The first mounting groove (14) is provided with a first sealing element (6), and the second mounting groove (15) is provided with a positioning bushing (13). The inner contour of the first mounting groove (14) is adapted to the outer contour of the first sealing element (6), and the inner contour of the second mounting groove (15) is adapted to the outer contour of the positioning bushing (13). A gasket (17) is provided between the positioning bushing (13) and the protrusion of the output shaft (5). The outer diameter of the gasket (17) is larger than the outer diameter of the output shaft (5). The protrusion of the output shaft (5) is arranged adjacent to the protrusion on the striking element (42).

8. The working head with an oil-leakage-proof structure according to claim 1, characterized in that, The intermediate cover (2) is connected to the main body of the power tool. The intermediate cover (2) is provided with an annular limiting groove (16). The annular limiting groove (16) is provided with a second sealing element (7). The outer contour of the annular limiting groove (16) is adapted to the outer contour of the second sealing element (7). The second sealing element (7) is located between the intermediate cover (2) and the power source of the power tool.

Images