WO2011088633A1 - Electric tool with transmission mechanism - Google Patents

Abstract

An electric tool with a transmission mechanism includes a rotating mechanism, a percussion mechanism, a rapid shifting mechanism and a main spindle locking mechanism. The rotating mechanism, the percussion mechanism and the rapid shifting mechanism are all assembled in a chamber formed by a reduction gearbox (1) and an intermediate cover (10), and an armature shaft, an intermediate shaft and a main spindle (17) are arranged in the chamber. The high-speed and low-speed gears are axially and separately mounted on the intermediate shaft, while a clutch (14), a high-speed driven gear and a low-speed driven gear are mounted on the main spindle. The high-speed gear is engaged with the high-speed driven gear, the low-speed gear is engaged with the low-speed driven gear, and the clutch is axially and removably mounted on the main spindle. A drive pin (16) is assembled on the clutch which is between the high-speed and the low-speed driven gear.

Description

[Name of invention made by ISA according to Rule 37.2] Power tool with transmission mechanism

Technical field

 The utility model relates to a power tool transmission structure, in particular to a coupling transmission structure of a mechanical double-speed impact drill with a spindle locking function.

technical background

 Currently, The mechanical double-speed impact drill structure on the market consists of motor components, gear reduction components, high and low speed gear clutch conversion devices, impact components, etc. The drive armature shaft and the two transmission shafts are all three-axis parallel transmission, with a single structure. The external shape is fixed, the transmission effect is not good, the noise is large, and the like; and there is no spindle locking device, or the locking structure is complicated and the cost is high. The operator needs to hold the drill chuck in one hand and the wrench in the other hand when changing the drill chuck, so the action is complicated and the operation is inconvenient.

Summary of the invention

In order to overcome the defects of the prior art without spindle locking function, complicated operation, inconvenient operation, etc., the utility model provides a power tool with an oblique axis and an angle joint transmission mode, with a spindle locking function, simple action and convenient operation. High and low two-speed rotation and impact structure.

 In order to solve the above technical problems, the technical solution proposed:

A high and low two-speed rotation and impact structure of a power tool, comprising a rotating mechanism, an impact mechanism, a high and low speed quick shifting mechanism and a spindle locking mechanism, wherein the rotating mechanism, the impact mechanism and the quick shifting mechanism are mounted on the speed reducer and a chamber composed of an intermediate cover, an armature shaft, an intermediate shaft and a main shaft are arranged in the chamber, a driving bevel gear is mounted on the armature shaft, and two axially spaced high-speed gears, a low-speed gear and a driven cone are arranged on the intermediate shaft. a gear, the driving bevel gear and the driven bevel gear adopt a connecting transmission mode with an oblique angle of a shaft, the main shaft is provided with a mounting clutch, a high speed slave gear and a low speed slave gear, and the high speed gear meshes with the high speed gear. The low speed gear meshes with the low speed gear, the clutch is axially movably fitted on the main shaft, the clutch is interlocked with the shift fork, and the transmission pin is mounted on the clutch, the clutch is located at the high speed slave gear and the low speed Between the gears, the high speed is driven from the gear and the low speed from the gear to the hole through which the drive pin passes

Further, the spindle locking pin has a groove, and the groove cooperates with the retaining ring for the limiting shaft, and the other end of the spindle locking pin is provided with a button, and the button is arranged below the speed reducer There is a return spring.

Further, the gear box is provided with a static impact tooth, and the front part of the main shaft is provided with a dynamic impact tooth, and the static impact tooth and the movable impact tooth are matched by a jaw clutch, and the impact block is located at the rear end of the spindle, the spindle The rear part is equipped with an impact return spring, and a rear end of the main shaft is provided with a steel ball, and the impact block cooperates with the steel ball.

 Further, the rear side of the middle cover has a circular positioning stop matched with the plastic housing, and a positioning groove is provided in the middle of the positioning opening.

 A circular positioning stop is arranged under the reduction box to match the plastic housing, and a positioning groove is arranged in the middle of the positioning opening.

The technical idea of the utility model is that the driving gear of the armature shaft is decelerated by the transmission mode of the oblique axis and the driven gear of the intermediate shaft, and the intermediate shaft and the main shaft have two sets of mutually meshing gears, and two of the main shafts A clutch is installed between the gears to adjust the position of the clutch, and the high and low speed gears are engaged or disengaged to achieve secondary deceleration. The gearbox is equipped with a static impact tooth. The spindle is equipped with a moving impact tooth. One end of the spindle is provided with a dial block. The displacement of the dial block can change the front and rear stroke of the spindle to realize the conversion of impact and non-impact.

The back of the reduction gear box is equipped with a spindle locking mechanism. The spindle pin directly cooperates with the circular hole of the reduction gear box, and is limited by the retaining ring for the shaft. The structure is simple, the cost is low, and the operation is convenient.

The utility model has the advantages that not only the difference in the shape of the product is obtained, but also the rigidity is good, the transmission is stable, the noise is small, the appearance is novel, the structure is simple, the positioning is reasonable, and the use is convenient.

DRAWINGS

 Figure 1 is a schematic view of the structure of the present invention.

 2 is a schematic view of the oblique shaft angle bevel gear transmission structure of the present invention.

 Figure 3 is a partial schematic view of the spindle locking structure.

 Figure 4 is a schematic view of the intermediate cover.

 Figure 5 is a schematic view of a reduction gearbox.

detailed description

 The present invention will be further described with reference to the accompanying drawings:

As shown in FIG. 1 and FIG. 2, a high and low two-speed rotation and impact structure of a power tool includes a rotating mechanism, an impact mechanism, and a high and low speed quick shifting mechanism, and the rotating mechanism, the impact mechanism and the quick shifting mechanism are mounted. In the chamber composed of the reduction gear box 1 and the intermediate cover 10, an armature shaft, an intermediate shaft 4 and a main shaft 17 are arranged in the chamber, and the driving bevel gear 2 on the armature shaft is connected by an oblique angle (∑≠90 degrees). The transmission mode drives the driven bevel gear 3 on the intermediate shaft to operate, and the driven bevel gear has an interference fit with the intermediate shaft, thereby rotating the two sets of gears on the intermediate shaft 4 and the main shaft 17. The high and low speeds are matched with the main shaft aperture, and the clutch and the main shaft are splined. The clutch 14 is provided with two driving pins 16 to limit the axial position of the high and low speed gears on the main shaft. When the shift knob adjusts the shift fork, When the clutch moves to the high speed from the direction of the gear 13, the driving pin on the clutch cooperates with the high speed from the circular hole of the gear to drive the spindle to rotate at a high speed; when the shift knob adjusts the fork to move the clutch to the low speed from the gear 15, the clutch The drive pin cooperates with the low hole from the round hole of the gear to drive the spindle to rotate at a low speed.

As shown in Fig. 1, the gear box is provided with a static impact tooth 5, and the main shaft is provided with a moving impact tooth 6, and the two impact teeth adopt a jaw-type clutch to realize an impact function. The displacement of the impact block 9 can change the stroke of the main shaft. The positioning sleeve 11 is internally provided with an impact return spring 12, and a steel ball 7 is arranged at the rear end of the main shaft. When the user operates the impact button 8, if the steel ball is in contact with the plane of the dial block The static impact tooth and the dynamic impact tooth have no cooperation, and the tool is not impacted; if the steel ball cooperates with the counterbore of the dial block, the static impact tooth contacts the movable impact tooth, and the tool is in an impact state.

 As shown in Figure 2, the active teeth on the armature shaft are coupled to the driven teeth in a non-orthogonal shaft.

As shown in FIG. 3, when the operator presses the spindle button 18, the spindle locking pin 19 moves downward, and the spindle locking pin cooperates with the groove on the spindle to lock the spindle; when the operation is stopped, the spindle locking pin is at the spindle return spring. Under the action of 20, a certain stroke is ejected, and the shaft is restrained by the retaining ring 21 to return to the initial state.

 As shown in Fig. 4, the rear side of the middle cover has a positioning circular opening, and a groove is formed in the opening.

 As shown in Fig. 5, the lower side of the reduction gearbox has a positioning circular stop, and a groove is arranged on the opening.

The content described in the embodiments of the present specification is merely an enumeration of the implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms stated in the embodiments, and the scope of protection of the present invention is also Equivalent technical means that can be conceived by those skilled in the art in light of the inventive concept.

Claims (5)

1. A high and low two-speed rotation and impact structure of a power tool, comprising a rotating mechanism, an impact mechanism, a high and low speed quick shifting mechanism and a spindle locking mechanism, wherein the rotating mechanism, the impact mechanism and the quick shifting mechanism are all mounted on the reduction gear box ( 1) a chamber composed of an intermediate cover (10), characterized in that: an armature shaft, an intermediate shaft and a main shaft are arranged in the chamber, and a driving bevel gear (2) is mounted on the armature shaft, and the intermediate shaft (4) is arranged There are two axially spaced high-speed gears, a low-speed gear and a driven bevel gear (3). The driving bevel gear and the driven bevel gear adopt a connecting transmission mode with an oblique angle of the shaft, and the main shaft is equipped with a mounting clutch (14). a high speed gear from the gear and a low speed gear, the high speed gear meshing with the high speed gear, the low speed gear meshing with the low speed gear, the clutch being axially displaceably fitted on the main shaft, the clutch and the fork Cooperating, a clutch pin is mounted on the clutch, the clutch is located between the high speed slave gear and the low speed slave gear, and the high speed slave gear and the low speed drive the gear Pin mating hole.
2. The high and low two-speed rotation and impact structure of the electric power tool according to claim 1, wherein the reduction gear box is provided with a static impact tooth, and the front portion of the main shaft is provided with a dynamic impact tooth, and the static impact tooth and the movement The impact tooth is fitted with a jaw clutch, the impact block is located at the rear end of the spindle, and the impact return spring (12) is mounted at the rear of the spindle. The rear end of the spindle is provided with a steel ball (7), the impact block and the steel. Ball (7) fits.
3. The high and low two-speed rotation and impact structure of the electric power tool according to claim 1 or 2, wherein the main shaft locking pin has a groove, and the groove cooperates with the retaining ring for the limiting shaft, The other end of the spindle locking pin is provided with a button, and a return spring is arranged between the lower side of the button and the reduction box.
4. The high and low speed rotation and impact structure of the power tool according to claim 3, wherein the rear side of the middle cover has a circular positioning stop matched with the plastic housing, and a positioning is provided in the middle of the positioning opening. Groove.
5. The high and low speed rotating and impact structure of the power tool according to claim 3, wherein a circular positioning stop is arranged under the reduction gear box to match the plastic housing, and a positioning concave is arranged in the middle of the positioning opening. groove.

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