Transmission mechanism with long service life

Abstract

The utility model provides a transmission mechanism long in service life, and relates to the technical field of gearboxes, the transmission mechanism comprises a transmission shaft, an output shaft, a vibration block, a hammering spring and a lead steel ball, the output shaft is connected with the transmission shaft, the transmission shaft is sleeved with the vibration block, the output shaft is sleeved with the hammering spring, and the hammering spring extends into the vibration block; the lead steel ball is arranged on the inner side of the vibration block, a lead groove is formed in the position, close to the lead steel ball, of the transmission shaft, the lead groove is provided with an extending groove, and the transmission shaft is further provided with an oil groove. The lead steel ball can enter the extension groove from the original lead groove, so that the collision force is dispersed, the stress of the collision point is relatively reduced, and the deformation and the heat productivity of the part are reduced, so that the service life of the part is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of gearboxes, and more particularly, to a transmission mechanism with a long service life. Background Art

[0002] In impact wrenches / screwdrivers and other power tools, a gearbox transmission mechanism is used. During the transmission process, the motor provides an output force → the gearbox transmission mechanism → the screw rotates. During this process, there is a reciprocating hammering motion perpendicular to the screw feeding direction between the transmission shaft inside the gearbox and the vibration block, which can provide a greater locking torque for the screw to be locked in.

[0003] Due to the hard collisions between the transmission structure parts over time, the collision surfaces are prone to deformation. At the same time, the collisions generate high heat, which in turn accelerates the consumption of the lubricating oil inside the transmission structure and the wear between parts, thereby reducing the service life of the transmission structure.

[0004] In view of this, this application aims to provide a transmission mechanism with a long service life to better solve the above technical problems. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a transmission mechanism with a long service life, which can solve the technical problem of the low service life of the transmission structure due to hard collisions.

[0006] The embodiments of this application provide a transmission mechanism with a long service life, including a transmission shaft, an output shaft, a vibration block, a hammering spring, and a lead ball. The output shaft is connected to the transmission shaft. The vibration block is sleeved on the transmission shaft. The hammering spring is sleeved on the output shaft and extends into the vibration block. The lead ball is arranged inside the vibration block. A lead groove is provided at a position of the transmission shaft close to the lead ball, and the lead groove is provided with an extension groove. An oil groove is also provided on the transmission shaft.

[0007] Further, the cross-section of the lead groove is V-shaped, and extension grooves are respectively provided at both ends of the lead groove.

[0008] Further, the extension groove communicates with the tail end of the lead groove.

[0009] Further, there is an angle between the extension line of the tail end of the lead groove and the extension line of the extension groove.

[0010] Further, the size of the angle is set to 30 - 60°.

[0011] Further, both ends of the hammering spring are respectively in contact with the vibration block and the transmission shaft.

[0012] Furthermore, the horn of the vibration block is arranged in contact with the tail fin of the output shaft.

[0013] Advantages of the present utility model:

[0014] The transmission mechanism with long service life provided by the present utility model includes a transmission shaft, an output shaft, a vibration block, a hammering spring, and a lead screw ball. The output shaft is connected to the transmission shaft. The vibration block is sleeved on the transmission shaft. The hammering spring is sleeved on the output shaft and extends into the vibration block. The lead screw ball is arranged inside the vibration block. A lead screw groove is provided at a position of the transmission shaft close to the lead screw ball, and the lead screw groove is provided with an extension groove. An oil groove is also provided on the transmission shaft. The structure of the present utility model is simple and reasonably designed. By providing the extension groove, during the collision process, the lead screw ball can enter the extension groove from the original lead screw groove, so that the collision force is dispersed, the force on the collision point becomes relatively smaller, the deformation amount and heat generation of the parts are reduced, thereby realizing an increase in the service life of the parts. Description of the drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0016] Figure 1 Structural schematic diagram of some embodiments of the present utility model;

[0017] Figure 2 Internal cross-sectional schematic diagram of the transmission mechanism of some embodiments of the present utility model;

[0018] Figure 3 Schematic diagram of the arrangement mode of the lead screw groove and the extension groove on the transmission shaft of some embodiments of the present utility model;

[0019] Figure 4 Schematic diagram of the collision force between the lead screw ball and the lead screw groove in the prior art;

[0020] Figure 5 Schematic diagram of the collision force between the lead screw ball and the lead screw groove of some embodiments of the present utility model.

[0021] Reference numerals are respectively:

[0022] Transmission shaft 1, output shaft 2, vibration block 3, hammering spring 4, lead screw ball 5, lead screw groove 6, extension groove 7. Detailed implementation manners

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. Usually, the components of the embodiments of this application described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0025] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0026] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0027] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0028] In the description of this application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] See Figures 1 - 3As shown in the figure, the transmission mechanism for long - life use in this embodiment includes a transmission shaft 1, an output shaft 2, a vibration block 3, a hammering spring 4, and a lead screw bead 5. The output shaft 2 is connected to the transmission shaft 1. The vibration block 3 is sleeved on the transmission shaft 1. The hammering spring 4 is sleeved on the output shaft 2 and extends into the vibration block 3. The lead screw bead 5 is arranged inside the vibration block 3. A lead screw groove 6 is provided at a position of the transmission shaft 1 close to the lead screw bead 5, and an extension groove 7 is provided in the lead screw groove 6. An oil groove is also provided on the transmission shaft 1.

[0030] The structure of this embodiment is simple and reasonably designed. By setting the extension groove 7, during the collision process, the lead screw bead 5 can enter the extension groove 7 from the original lead screw groove 6, so that the collision force is dispersed, the force on the collision point becomes relatively smaller, the deformation amount and heat generation of the parts are reduced, and thus the service life of the parts is increased.

[0031] Specifically, in this embodiment, by adding the extension groove 7 to the original lead screw groove 6, not only can the collision force be dispersed, but also the processing process is simple and it will not increase the production burden of the parts.

[0032] Specifically, in this embodiment, the cross - section of the lead screw groove 6 is V - shaped, and extension grooves 7 are respectively provided at both ends of the lead screw groove 6.

[0033] Specifically, the extension groove 7 communicates with the tail end of the lead screw groove 6.

[0034] Specifically, there is an included angle between the extension line of the tail end of the lead screw groove 6 and the extension line of the extension groove 7.

[0035] Specifically, the size of the included angle is set to be 30 - 60°.

[0036] In this embodiment, it is specifically shown that extension grooves 7 are respectively provided at both ends of the lead screw groove 6, and there is an included angle of 30 - 60° between the extension line of the extension groove 7 and the extension line of the lead screw groove 6. See Figure 4 and Figure 5 As shown in the figure, through the reasonable setting of the extension groove 7 at an angle in this embodiment, the collision force is divided from the original one section into two sections, the force on the collision point becomes relatively smaller, the deformation amount and heat generation of the parts are reduced, and thus the service life of the parts is increased.

[0037] In some embodiments, both ends of the hammering spring 4 are respectively abutted against the vibration block 3 and the transmission shaft 1.

[0038] Specifically, the horn of the vibration block 3 is fitted with the tail wing of the output shaft 2.

[0039] In this embodiment, with such an arrangement, when the rotational resistance increases, the output shaft 2 stops rotating, at which time the horns of the vibration block 3 fit against the tail wing of the output shaft 2, and the vibration block 3 moves along the extension groove 7 on the transmission shaft 1 under the guidance of the lead steel ball 5, hits the groove wall, produces a hard collision, compresses the hammer spring 4, and causes the vibration block 3 to retreat along the axial diameter of the transmission shaft 1. When the vibration block 3 retreats until the horns of the vibration block 3 jump over the tail wing of the output shaft 2, the vibration block 3 will move forward along the axial diameter of the transmission shaft 1 under the elastic force of the hammer spring 4, so that the horns of the vibration block 3 will hit the tail wing of the output shaft 2, and the inertial impulse will be converted into locking torque. The reciprocating hammering increases the output torque to achieve a further locking function.

[0040] Since the lead steel ball 5 between the vibration block 3 and the transmission shaft 1 reciprocates along the lead groove 6 and produces hard collisions, the wall of the original lead groove 6 is subjected to high-frequency hard collisions, and the impact force value will not be dispersed, resulting in the deformation of the parts by hard collisions. Secondly, the hard collision will cause the temperature of the transmission structure to rise rapidly, resulting in the aperture of the vibration block 3 and the shaft diameter of the transmission shaft 1 having no lubrication effect, the wear of the parts is aggravated, and the service life is shortened. In this embodiment, by adding an extension groove 7 to the original lead groove 6, it is equivalent to adding a new stroke. When the lead steel ball 5 hits the lead wall, the impact force will be dispersed due to the extension space, and the force hitting the collision position of the original lead groove 6 will be greatly reduced, thereby reducing the deformation of the parts by hard collision, reducing the heat generated by hard collision, reducing the consumption of lubricating oil, increasing the reliability of the transmission, and improving the service life of the transmission structure.

[0041] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transmission mechanism for long - life use, characterized in that: It includes a drive shaft, an output shaft, a vibration block, a hammering spring and a lead ball. The output shaft is connected to the drive shaft. The vibration block is sleeved on the drive shaft. The hammering spring is sleeved on the output shaft and extends into the vibration block. The lead ball is arranged inside the vibration block. A lead groove is provided at a position of the drive shaft close to the lead ball, and an extension groove is provided in the lead groove. An oil groove is also provided on the drive shaft.

2. The transmission mechanism for long - life use according to claim 1, wherein: The cross-section of the lead groove is V-shaped, and extension grooves are respectively provided at both ends of the lead groove.

3. The transmission mechanism for long-life use according to claim 2, characterized in that: The extension groove communicates with the tail end of the lead groove.

4. The transmission mechanism for long-life use according to claim 3, wherein: An included angle exists between the extension line of the tail end of the lead groove and the extension line of the extension groove.

5. The transmission mechanism for long-term use according to claim 4, characterized in that: The size of the included angle is set to be 30-60°.

6. The transmission mechanism for long - life use according to claim 1, wherein: Both ends of the hammering spring respectively abut against the vibration block and the drive shaft.

7. The transmission mechanism for long-term use according to claim 1, characterized in that: The horn of the vibration block is arranged in fit with the tail fin of the output shaft.

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