A split-type transmission mounting connection structure for a hammer drill

Abstract

This invention discloses a split-type transmission installation and connection structure for a hammer drill, including a main support, a drill bushing, and a piston. A positioning mounting bracket is fixed at the connection end between the main support and the drill bushing. The positioning mounting bracket has mounting holes, and a power transmission switching device is connected through the mounting holes of the main support and the positioning mounting bracket. The power transmission switching device includes a power transmission shaft, a ball joint rocker arm, a drill bushing transmission shaft, a clutch sleeve, and a clutch spring. This invention can withstand large torque loads during the operation of the hammer drill, improves the stability of the transmission connection, and prevents the transmission components from shifting after long-term use, thus extending the service life of the hammer drill's transmission parts and facilitating disassembly and assembly. Furthermore, the power transmission part that switches between different gears of the hammer drill, in conjunction with the power transmission shaft, is designed as a split unit. This split design facilitates disassembly and replacement in case of damage to a certain part, while also reducing maintenance and replacement costs.

Description

Technical Field

[0001] This invention relates to the field of hammer drill technology, and more specifically to a split-type transmission mounting connection structure for a hammer drill. Background Technology

[0002] Hammer drills are commonly used impact tools. They contain an impact piston mechanism and a rotating drill sleeve mechanism. Hammer drills typically have different gear adjustment modes: hammer mode, hammer drill mode, and drill mode. Currently, the power for these different modes is transmitted from the motor to the gears in the drill sleeve and the piston's rocker shaft via a single drive shaft. Gear switching is achieved by controlling the movement of the drive shaft. The drive shaft is connected to the hammer drill housing and main support, leading to several drawbacks: First, the drive shaft bears a large torque during operation, and the existing drive shaft installation is unstable under this torque, easily shifting after prolonged use. This causes the drive shaft axis to be out of sync with the drill sleeve and piston axes, accelerating damage. Second, the single-shaft drive switching method is not only cumbersome to install, but also requires disassembly and replacement of the entire shaft drive system when one part is damaged, resulting in high costs and inconvenience. Therefore, improvements are needed to address these problems with the existing technology. Summary of the Invention

[0003] The purpose of this invention is to solve the problems mentioned in the background art and to provide a split-type transmission installation connection structure for a hammer drill.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: a split-type transmission installation connection structure for a hammer drill, including a main support, a drill sleeve, and a piston. A positioning mounting bracket is fixed at the connection end of the main support and the drill sleeve. The positioning mounting bracket has mounting holes. A power transmission switching device is connected through the mounting holes of the main support and the positioning mounting bracket. The power transmission switching device includes a power transmission shaft, a ball-head rocker arm, a drill sleeve transmission shaft, a clutch sleeve, and a clutch spring. One end of the power transmission shaft is rotatably connected to the main support, and the other end is rotatably connected to the mounting hole through a bearing. The ball-head rocker arm is sleeved on the power transmission shaft and is connected to the piston. The clutch sleeve is slidably sleeved on the ball-head rocker arm, which can realize the transmission connection or disengagement between the ball-head rocker arm and the power transmission shaft. The clutch spring is sleeved on the ball-head rocker arm, and its elasticity causes the clutch sleeve to reset and rotate synchronously with the power transmission shaft. The drill sleeve transmission shaft is connected to the gear on the drill sleeve, and one end of the drill sleeve can be connected or disengaged from the power transmission shaft.

[0005] In the aforementioned split-type transmission installation connection structure on a hammer drill, the positioning mounting bracket is provided with a connection hole, and the positioning mounting bracket is connected to the main support through the connection hole. The positioning mounting bracket and the main support are respectively provided with multiple corresponding fixing holes.

[0006] In the aforementioned split-type transmission installation connection structure on a hammer drill, the positioning mounting frame and the main support are respectively provided with multiple corresponding positioning columns and positioning holes.

[0007] In the aforementioned split-type transmission installation connection structure on a hammer drill, a positioning groove is provided in the connection hole, and a positioning boss corresponding to and matching the positioning groove is provided at the end of the main bracket.

[0008] In the aforementioned split-type transmission installation and connection structure on a hammer drill, a shifting device is also included. The shifting device includes a shift knob, a drill stop holder, a hammer stop holder, and a shift spring. Rotating the shift knob can drive the drill stop holder and the hammer stop holder to move respectively. The movement of the hammer stop holder can drive the clutch sleeve to move, compress the clutch spring, and disengage the clutch sleeve from the transmission connection with the power transmission shaft. The hammer stop holder returns to its original position, and the clutch sleeve reconnects with the power transmission shaft under the elastic force of the clutch spring. Moving the drill stop holder can drive the drill sleeve transmission shaft to move, disengaging it from the transmission connection with the power transmission shaft. The drill stop holder returns to its original position, and the drill sleeve transmission shaft reconnects with the power transmission shaft under the elastic force of the shift spring.

[0009] In the aforementioned split-type transmission installation connection structure on a hammer drill, the drill sleeve transmission shaft is provided with a toothed groove 1 that meshes with the gear on the drill sleeve, and the end of the power transmission shaft is provided with a toothed groove 2 that corresponds to and meshes with the toothed groove 1. The movement of the drill stop can drive the drill sleeve transmission shaft, causing the toothed groove 1 to disengage from the toothed groove 2. The drill stop resets, and the elastic force of the shift spring pushes the drill sleeve transmission shaft to move, causing the toothed groove 1 to mesh with the toothed groove 2.

[0010] In the aforementioned split-type transmission installation connection structure on a hammer drill, the ball head rocker arm is provided with a third tooth groove, the power transmission shaft is provided with a fourth tooth groove, and the clutch sleeve is provided with a clutch tooth groove. Under the action of the clutch spring, the clutch tooth groove on the clutch sleeve can engage with the third tooth groove and the fourth tooth groove respectively. The movement of the hammer stop shifter drives the clutch sleeve to move along the ball head rocker arm to compress the clutch spring, so that the clutch tooth groove disengages from the fourth tooth groove.

[0011] In the aforementioned split-type transmission installation connection structure on a hammer drill, the drill sleeve transmission shaft includes a drill tooth sleeve and a drill shaft. A pawl is fixed on the drill tooth sleeve, and a tooth groove is provided on the drill tooth sleeve. The drill tooth sleeve is sleeved on the drill shaft, and the drill stop pawl drives the drill tooth sleeve to move on the drill shaft, so that the tooth groove on the drill tooth sleeve disengages from the tooth groove at the end of the power transmission shaft.

[0012] In the aforementioned split-type transmission installation connection structure on a hammer drill, the end of the power transmission shaft is provided with a drill shaft positioning hole, the tooth groove one on the drill tooth sleeve is disengaged or engaged with the tooth groove two at the end of the power transmission shaft, and the end of the drill shaft is correspondingly located in the drill shaft positioning hole.

[0013] In the aforementioned split-type transmission installation connection structure on a hammer drill, a transmission shaft positioning cover is connected to the main bracket, and the end of the power transmission shaft is connected to the power mechanism of the hammer drill through a transmission gear. The transmission gear is located in the transmission shaft positioning cover and forms a positioning rotation.

[0014] The beneficial effects of this invention are:

[0015] This invention uses a positioning mounting bracket to position the power transmission shaft that transmits the working power of the hammer drill. This allows the hammer drill to withstand large torque loads during operation, improving the stability of the transmission connection. Even after long-term use, the transmission components are less likely to shift, ensuring that the axis of the power transmission shaft is on the same plane as the axis of the drill sleeve and piston in the hammer drill. This extends the service life of the hammer drill transmission components. At the same time, the design of the power transmission shaft also facilitates the disassembly and assembly of related power transmission components.

[0016] This invention, while setting up a power transmission shaft, also features a split design for the power transmission part that coordinates with the hammer stop, hammer drill stop, and drill stop in the hammer drill to switch between different gears. The split design facilitates disassembly and replacement in case of damage to a certain part, and also reduces the cost of maintenance and replacement. Attached Figure Description

[0017] Figure 1 This is an exploded view of the present invention;

[0018] Figure 2 This is a perspective view of the present invention;

[0019] Figure 3 This is a cross-sectional view of the present invention after it is installed with the hammer drill housing;

[0020] Figure 4 This is a perspective view of the invention from another direction. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Please see Figures 1 to 4 This invention provides a split-type transmission installation and connection structure for a hammer drill, including a main support 1, a drill sleeve 2, and a piston 3. A positioning mounting frame 4 is fixed at the connection end between the main support 1 and the drill sleeve 2. The positioning mounting frame 4 is provided with mounting holes 5 and connecting holes 13. The main support 1 and other components are installed and connected through the connecting holes 13. The positioning mounting frame 4 and the main support 1 are respectively provided with multiple corresponding fixing holes 14. The two are fixedly connected through the fixing holes 14. A power transmission switching device is connected between the main support 1 and the mounting holes 5 of the positioning mounting frame 4. The power transmission switching device includes a power transmission shaft 6, a ball joint rocker arm 7, a drill sleeve transmission shaft 8, a clutch sleeve 9, and a clutch spring 10. The positioning mounting frame can position the power transmission shaft that transmits the working power of the hammer drill. It can bear the large torque load during the operation of the hammer drill, improve the stability of the transmission connection, and prevent the transmission components from shifting even after long-term use. This ensures that the axis of the power transmission shaft is on the same plane as the axis of the drill sleeve and the piston in the hammer drill, improving the service life of the hammer drill transmission part. At the same time, the design of the power transmission shaft also facilitates the disassembly and assembly of related power transmission components.

[0024] One end of the power transmission shaft 6 is rotatably connected to the main support 1. A transmission shaft positioning cover 32 is connected to the main support 1. The end of the power transmission shaft 6 is connected to the power mechanism of the hammer drill through a transmission gear 33. The transmission gear 33 is partially located in the transmission shaft positioning cover 32, forming a positioning rotation. The other end of the power transmission shaft 6 is rotatably connected to the mounting hole 5 through a bearing 11. The positioning mounting bracket 4 is provided with a mounting boss 4-1 for positioning the bearing 11. The ball joint rocker arm 7 is sleeved on the power transmission shaft 6 and is connected to the piston 3. The clutch sleeve 9 is slidably sleeved on the ball joint rocker arm 7. The clutch spring 10 is sleeved on the ball joint rocker arm 7, and its two ends abut against the ball joint rocker arm 7 and the clutch sleeve 9, respectively. The drill sleeve transmission shaft 8 is connected to the gear 12 on the drill sleeve 2, and one end of it can be connected to or disconnected from the power transmission shaft 6.

[0025] The power transmission switching device and the power drive shaft are designed separately, enabling power transmission to switch between different gears in the hammer drill, hammer gear, and drill gear. The separate design facilitates disassembly and replacement after a certain part is damaged, and also reduces the cost of maintenance and replacement.

[0026] The drill sleeve drive shaft 8 includes a drill tooth sleeve 28 and a drill shaft 29. A paddle 30 is fixed on the drill tooth sleeve 28. The drill tooth sleeve 28 is fitted onto the drill shaft 29 and has a tooth groove 23 that meshes with the gear 12 on the drill sleeve 28. The end of the power drive shaft 6 has a tooth groove 24 that meshes with the tooth groove 23. The ball joint rocker arm 7 has a tooth groove 25. The power drive shaft 6 has a tooth groove 26. The clutch sleeve 9 has a clutch tooth groove 27. Under the action of the clutch spring 10, the clutch tooth groove 27 on the sleeve 9 can be engaged with tooth groove 3 25 and tooth groove 4 26 respectively; a drill shaft positioning hole 31 is provided at the end of the power transmission shaft 6, one end of the drill shaft 29 is connected in the drill shaft positioning hole 31, and the other end is connected to the hammer drill housing through a bearing. Tooth groove 1 23 on the drill tooth sleeve 28 is disengaged or engaged with tooth groove 24 at the end of the power transmission shaft 6, and the ends of the drill shaft 29 are all correspondingly located in the drill shaft positioning hole 31.

[0027] The present invention also includes a shifting device, which includes a shifting knob 19, a drill gear shifter 20, a hammer gear shifter 21, and a shifting spring 22. The shifting device is installed and connected to the hammer drill housing. By operating the various components of the power transmission switching device in the shifting device, the hammer drill can be adjusted to different gears.

[0028] When the clutch tooth groove 27 on the clutch sleeve 9 meshes with tooth groove 3 25 and tooth groove 4 26 respectively, and when tooth groove 1 23 on the drill tooth sleeve 28 meshes with tooth groove 2 24 at the end of the power transmission shaft 6, the power transmission shaft 6 simultaneously drives the ball head rocker rod 7 and the drill tooth sleeve 28, thereby realizing the hammer drill gear operation of the hammer drill.

[0029] When the shift knob 19 is rotated, it drives the hammer stop holder 21 to move. The movement of the hammer stop holder 21 can drive the clutch sleeve 9 to move along the ball joint rod 7 to compress the clutch spring 10 and disengage the clutch sleeve 9 from the transmission connection with the power transmission shaft 6. At this time, the power transmission shaft 6 only drives the drill tooth sleeve 28, thereby realizing the operation of the hammer drill. When the shift knob 19 is rotated to reset, the hammer stop holder 21 is reset with rotation, and the clutch sleeve 9 is connected to the power transmission shaft 6 under the elastic force of the clutch spring 10.

[0030] When the shift knob 19 is rotated, it drives the drill stop holder 20 to move. The movement of the drill stop holder 20, through the paddle 30, can drive the drill sleeve drive shaft 8 to move along the drill shaft 29, disengaging it from the transmission connection with the power drive shaft 6. At this time, the power drive shaft 6 only drives the ball head rocker 7, thereby realizing the hammer stop operation of the hammer drill. When the shift knob 19 is rotated to reset, the drill stop holder 20 is also rotated to reset, and the drill sleeve drive shaft 8 is connected to the power drive shaft 6 under the push of the shift spring 22.

[0031] Furthermore, in order to improve the positioning stability of the installation connection between the mounting bracket 4 and the main support 1, the positioning mounting bracket 4 and the main support 1 are respectively provided with a plurality of corresponding positioning posts 15 and positioning holes 16, the connection hole 13 is provided with a positioning groove 17, and the end of the main support 1 is provided with a positioning boss 18 that corresponds to and matches the positioning groove 17.

[0032] The above provides a detailed description of a split-type transmission installation connection structure for a hammer drill provided by an embodiment of the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the technical solution disclosed in the present invention. At the same time, for users of general skills in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A split-type transmission mounting connection structure for a hammer drill, comprising a main support (1), a drill sleeve (2), and a piston (3), characterized in that: A positioning mounting bracket (4) is fixed at the connection end between the main support (1) and the drill bushing (2). The positioning mounting bracket (4) is provided with mounting holes (5). A power transmission switching device is connected through the mounting holes (5) of the main support (1) and the positioning mounting bracket (4). The power transmission switching device includes a power transmission shaft (6), a ball-head rocker arm (7), a drill bushing transmission shaft (8), a clutch sleeve (9), and a clutch spring (10). One end of the power transmission shaft (6) is rotatably connected to the main support (1), and the other end is rotatably connected to the mounting hole (5) through a bearing (11). The ball joint rod (7) is sleeved on the power transmission shaft (6) and is connected to the piston (3) for transmission. The clutch sleeve (9) is slidably sleeved on the ball joint rod (7) and can realize the transmission connection or disengagement between the ball joint rod (7) and the power transmission shaft (6). The clutch spring (10) is sleeved on the ball joint rod (7) and its elasticity causes the clutch sleeve (9) to reset and rotate synchronously with the power transmission shaft (6). The drill bushing transmission shaft (8) is connected to the gear (12) on the drill bushing (2) for transmission, and one end of it can be connected to or disengaged from the power transmission shaft (6). It also includes a shifting device, which includes a shift knob (19), a drill gear shifter (20), a hammer gear shifter (21), and a shift spring (22). The shift knob (19) can rotate to drive the drill gear shifter (20) and the hammer gear shifter (21) to move respectively. The movement of the hammer gear shifter (21) can drive the clutch sleeve (9) to move and compress the clutch spring (10), and cause the clutch sleeve (9) to disengage from the transmission connection between the clutch sleeve (9) and the power transmission shaft (6). The hammer gear shifter (21) resets, and the clutch sleeve (9) is connected to the power transmission shaft (6) under the elastic force of the clutch spring (10). The movement of the drill gear shifter (20) can drive the drill sleeve transmission shaft (8) to move and disengage from the transmission connection between the drill gear shifter (20) and the power transmission shaft (6). The drill gear shifter (20) resets, and the drill sleeve transmission shaft (8) is connected to the power transmission shaft (6) under the elastic force of the shift spring (22). The drill bushing drive shaft (8) is provided with a tooth groove 1 (23) that meshes with the gear (12) on the drill bushing (2). The end of the power drive shaft (6) is provided with a tooth groove 2 (24) that meshes with the tooth groove 1 (23). The movement of the drill stop holder (20) can drive the drill bushing drive shaft (8) to disengage the tooth groove 1 (23) from the tooth groove 2 (24). The drill stop holder (20) resets, and the elastic force of the shift spring (22) pushes the drill bushing drive shaft (8) to move, so that the tooth groove 1 (23) meshes with the tooth groove 2 (24). The ball joint rocker arm (7) is provided with a toothed groove three (25), the power transmission shaft (6) is provided with a toothed groove four (26), and the clutch sleeve (9) is provided with a clutch toothed groove (27). Under the action of the clutch spring (10), the clutch toothed groove (27) on the clutch sleeve (9) can engage with the toothed groove three (25) and the toothed groove four (26) respectively. The movement of the hammer stop bracket (21) drives the clutch sleeve (9) to move along the ball joint rocker arm (7) to compress the clutch spring (10), so that the clutch toothed groove (27) and the toothed groove four (26) disengage.

2. The split-type transmission mounting connection structure on a hammer drill according to claim 1, characterized in that: The positioning mounting bracket (4) is provided with a connection hole (13). The positioning mounting bracket (4) is connected to the main support (1) through the connection hole (13). The positioning mounting bracket (4) and the main support (1) are respectively provided with multiple corresponding fixing holes (14).

3. The split-type transmission mounting connection structure on a hammer drill according to claim 2, characterized in that: The positioning mounting bracket (4) and the main bracket (1) are respectively provided with multiple corresponding positioning posts (15) and positioning holes (16).

4. The split-type transmission mounting connection structure on a hammer drill according to claim 2, characterized in that: The connecting hole (13) is provided with a positioning groove (17), and the end of the main bracket (1) is provided with a positioning boss (18) that matches the positioning groove (17).

5. The split-type transmission mounting connection structure on a hammer drill according to claim 1, characterized in that: The drill sleeve drive shaft (8) includes a drill tooth sleeve (28) and a drill shaft (29). A paddle (30) is fixed on the drill tooth sleeve (28). A tooth groove (23) is set on the drill tooth sleeve (28). The drill tooth sleeve (28) is sleeved on the drill shaft (29). The drill stop paddle (20) drives the drill tooth sleeve (28) to move on the drill shaft (29) through the paddle (30), so that the tooth groove (23) on the drill tooth sleeve (28) disengages from the tooth groove (24) at the end of the power drive shaft (6).

6. The split-type transmission mounting connection structure on a hammer drill according to claim 5, characterized in that: The end of the power transmission shaft (6) is provided with a drill shaft positioning hole (31). The tooth groove one (23) on the drill tooth sleeve (28) is disengaged or engaged with the tooth groove two (24) at the end of the power transmission shaft (6), and the end of the drill shaft (29) is located in the drill shaft positioning hole (31).

7. The split-type transmission mounting connection structure on a hammer drill according to claim 1, characterized in that: The main support (1) is connected to a drive shaft positioning cover (32). The end of the power drive shaft (6) is connected to the power mechanism of the hammer drill through a drive gear (33). The drive gear (33) is partially located in the drive shaft positioning cover (32) to form a positioning rotation.

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