Guiding type electric hammer clutch

Abstract

The utility model provides a guiding type electric hammer clutch. The problems that when an existing electric hammer is locked, large axial thrust is still needed to overcome the pressure of a pressing plate on a transmission ball, the condition for achieving the idle clutch function is high, and triggering is not easy are solved. The end face, facing the clutch plate, of the gear is provided with the clamping groove used for installing the roller pin, the depth of the clamping groove is smaller than the radius of the roller pin, and the side, in the rotating direction of the gear, of the clamping groove is provided with the guide inclined face. When the transmission shaft rotates, the clutch plate is driven to rotate synchronously, the roller pin is pressed in the clamping groove through the pressing plate to drive the gear to rotate, when a drill bit is clamped, torque is suddenly increased, the roller pin can be easily separated from the clamping groove along the guide inclined face through the guide inclined face on one side of the clamping groove, the pressure plate is jacked in the direction of the pressing plate, and the clutch function is achieved. And at the moment, the clutch plate and the transmission shaft idle to protect the user.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a guiding type electric hammer clutch. Background Art

[0002] Common electric hammers include multiple modes such as drilling, hammer drilling, and electric pickaxes, and appropriate modes can be selected for operation according to different working conditions. In the drilling or hammer drilling mode, due to complex working conditions, the drill bit often gets stuck and blocked. Since the electric hammer has a large power, the blocking torque is large. If the output torque is not interrupted in time during blocking, the reverse torque generated on the drill bit will cause injury to the operator, posing a safety hazard. Therefore, electric hammers are generally equipped with clutches, and when overloaded, the clutch will cut off the output torque in time.

[0003] For example, for the electric hammer clutch with the application number 201920152717.6, the transmission sphere is arranged on the intermediate gear, and the transmission sphere is pressed against the clutch plate by an elastically arranged pressure plate. However, a groove matching with the transmission sphere is opened on the pressure plate, and the transmission sphere can move along the groove. During actual use, when the torque at startup is too large, the transmission sphere has a certain range of movement on the groove, and the transmission sphere abuts against one end of the groove. A relatively large axial thrust is still required to overcome the pressure of the pressure plate on the transmission sphere, and the conditions for realizing the idling clutch function are relatively high and not easy to trigger. There are areas for improvement in the prior art. Summary of the Invention

[0004] The device of the utility model aims at the above-mentioned existing situation and provides a guiding type electric hammer clutch, which is characterized in that it includes a transmission shaft and a gear movably sleeved on the transmission shaft. A clutch plate that rotates synchronously with the transmission shaft is arranged on the transmission shaft, and a pressure plate for pressing the clutch plate against the end face of the gear is provided. A plurality of installation grooves that are evenly distributed around the center of the clutch plate and penetrate the clutch plate in the vertical direction are opened on the clutch plate. Needles with axes passing through the center of the clutch plate are arranged in the installation grooves. A card slot for installing the needles is opened on the end face of the gear facing the clutch plate, and the depth of the card slot is less than the radius of the needles. The card slot is a sector with the center of the clutch plate as the center of the circle, and a guiding inclined surface is arranged on one side of the card slot along the rotation direction of the gear. The guiding inclined surface gradually inclines towards the card slot from top to bottom.

[0005] Preferably, six installation grooves, needles, and card slots are provided, and the installation grooves, needles, and card slots correspond to each other one by one.

[0006] Preferably, a limiting plate is fixedly arranged on the transmission shaft. The limiting plate is located on the side of the pressure plate on the transmission shaft away from the gear. A first spring for driving the pressure plate to press against the needles is arranged between the limiting plate and the pressure plate, and the first spring surrounds the outer circumference of the transmission shaft.

[0007] Preferably, a second spring driving the pressure plate to press against the needle roller is provided between the limit plate and the pressure plate, the second spring is surrounded by the outer periphery of the first spring, and the second spring and the second spring are both located between the pressure plate and the new companion.

[0008] Preferably, a flat through hole is provided at the center of the clutch plate, penetrating the clutch plate and used for synchronous rotation with the transmission shaft.

[0009] Preferably, a mounting cavity is provided on the upper end surface of the gear, the slot is provided at the bottom of the mounting cavity, and the clutch plate and the needle roller are located in the mounting cavity.

[0010] Compared with the prior art, in the utility model, by movably arranging the needle roller on the clutch plate, the clutch plate is driven to rotate synchronously when the transmission shaft rotates, and the needle roller is pressed against the above-mentioned groove through the pressure plate to drive the gear to rotate. When the drill bit is stuck, the torque suddenly increases, and the needle roller can easily escape from the groove along the guide slope through the guide slope on one side of the groove, and push the pressure plate toward the pressure plate to realize the clutch function. At this time, the clutch plate and the transmission shaft are idling to protect the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the overall structural view of the utility model;

[0012] Figure 2 It is the structural explosion diagram of the utility model;

[0013] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0014] Markings in the figure: 1. transmission shaft; 2. gear; 3. clutch plate; 4. pressure plate; 5. mounting groove; 6. needle roller; 7. slot; 8. limit plate; 9. first spring; 10. second spring; 11. flat through hole; 12. mounting cavity; 13. guide ramp. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0016] like Figures 1-3As shown, a guided electric hammer clutch includes a transmission shaft 1 and a gear 2 movably mounted on the transmission shaft 1, a clutch plate 3 is arranged on the transmission shaft 1 and rotates synchronously with the transmission shaft 1, a flat through hole 11 is opened in the center of the clutch plate 3 and passes through the clutch plate 3 and is used for rotating synchronously with the above-mentioned transmission shaft 1, and the clutch plate 3 is mounted on the transmission shaft 1 through the flat through hole 11 and realizes synchronous rotation with the transmission shaft 1. and a pressure plate 4 for pressing the clutch plate 3 against the end surface of the gear 2. The clutch plate 3 is provided with a plurality of mounting grooves 5 evenly distributed around the center of the clutch plate 3 and penetrating the clutch plate 3 in the vertical direction. A needle roller 6 with an axis passing through the center of the clutch plate 3 is arranged in the mounting groove 5. A clamping groove 7 for mounting the needle roller 6 is arranged on the end surface of the gear 2 facing the clutch plate 3, and the depth of the clamping groove 7 is less than the radius of the needle roller 6. The clamping groove 7 is a sector with the center of the clutch plate 3 as the center of the circle, and a guide slope 13 is arranged on one side of the clamping groove 7 along the rotation direction of the gear 2, and the guide slope 13 gradually tilts toward the clamping groove direction from top to bottom. There are six mounting grooves 5, needle rollers 6 and clamping grooves 7, and the mounting grooves 5, needle rollers 6 and clamping grooves 7 correspond to each other. The upper end surface of the gear 2 is provided with a mounting cavity 12, the slot 7 is provided at the bottom of the mounting cavity 12, and the clutch plate 3 and the needle roller 6 are located in the mounting cavity 12. After installation, the overall volume is further reduced and the structure is more compact.

[0017] By movably arranging the needle roller 6 on the clutch plate 3, the clutch plate 3 is driven to rotate synchronously when the transmission shaft 1 rotates, and the needle roller 6 is pressed against the above-mentioned groove 7 through the pressure plate 4 to drive the gear 2 to rotate. When the drill bit is stuck, the torque suddenly increases, and the needle roller 6 can easily disengage from the groove 7 along the guide slope 13 through the guide slope 13 on one side of the groove 7, and push the pressure plate 4 toward the pressure plate 4 to realize the clutch function. At this time, the clutch plate 3 and the transmission shaft 1 are idling to protect the user, and the clutch function can be triggered more easily when a jam occurs.

[0018] A limit plate 8 is fixedly arranged on the transmission shaft 1. The limit plate 8 is located on the side of the pressure plate 4 on the transmission shaft 1 away from the gear 2. A first spring 9 is arranged between the limit plate 8 and the pressure plate 4 to drive the pressure plate 4 to press against the needle roller 6. The first spring 9 is surrounded by the outer periphery of the transmission shaft 1. A second spring 10 is arranged between the limit plate 8 and the pressure plate 4 to drive the pressure plate 4 to press against the needle roller 6. The second spring 10 is surrounded by the outer periphery of the first spring 9. The second spring 10 and the second spring 10 are both located between the pressure plate 4 and the new companion. The pressure plate 4 is pressed against the slot 7 by the first spring 9 and the second spring 10 arranged inside and outside, which is more stable when used.

[0019] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but they will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A guided electric hammer clutch, characterized in that: The invention comprises a transmission shaft (1) and a gear (2) movably sleeved on the transmission shaft (1); the transmission shaft (1) is provided with a clutch plate (3) which rotates synchronously with the transmission shaft (1), and a pressure plate (4) used for pressing the clutch plate (3) against the end surface of the gear (2); the clutch plate (3) is provided with a plurality of mounting grooves (5) which are evenly distributed around the center of the clutch plate (3) and penetrate the clutch plate (3) in the vertical direction; the mounting groove (5) is provided with a shaft line passing through the upper A needle roller (6) is arranged at the center of the clutch plate (3); a groove (7) for mounting the needle roller (6) is provided on the end surface of the gear (2) facing the clutch plate (3); the depth of the groove (7) is less than the radius of the needle roller (6); the groove (7) is in the shape of a sector with the center of the clutch plate (3) as the center; a guide slope (13) is provided on one side of the groove (7) along the gear rotation direction; the guide slope (13) is gradually inclined from top to bottom toward the groove (7).

2. A guided electric hammer clutch according to claim 1, characterized in that: Six of the installation grooves (5), rolling needles (6) and clamping grooves (7) are provided, and the installation grooves (5), rolling needles (6) and clamping grooves (7) correspond to each other one by one.

3. A guided electric hammer clutch according to claim 1, characterized in that: A limit plate (8) is fixedly arranged on the transmission shaft (1), and the limit plate (8) is located on the side of the pressure plate (4) on the transmission shaft (1) away from the gear (2). A first spring (9) is arranged between the limit plate (8) and the pressure plate (4) to drive the pressure plate (4) to press against the needle roller (6), and the first spring (9) is surrounded by the outer periphery of the transmission shaft (1).

4. A guided electric hammer clutch according to claim 3, characterized in that: A second spring (10) is provided between the limit plate (8) and the pressure plate (4) to drive the pressure plate (4) to press against the needle roller (6). The second spring (10) is surrounded by the outer periphery of the first spring (9). The second spring (10) and the second spring (10) are both located between the pressure plate (4) and the new companion.

5. The guided electric hammer clutch according to claim 1, characterized in that: The clutch plate (3) is provided at its center with a flat through hole (11) that penetrates the clutch plate (3) and is used for synchronous rotation with the transmission shaft (1).

6. A guided electric hammer clutch according to claim 1, characterized in that: An installation cavity (12) is provided on the upper end surface of the gear (2), the clamping groove (7) is provided at the bottom of the installation cavity (12), and the clutch plate (3) and the needle roller (6) are located in the installation cavity (12).

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