JPS62173180A - Vibrating drill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a vibration drill, and particularly to a vibration drill in which a plurality of stages of planetary mechanisms are arranged in series between a motor and an output section.

[Background technology 1 FIG. 8 shows a conventional example of this type of vibration drill.

The motor 2, which is housed in the rear part of the main body casing 1 with its axial direction being the front-rear direction, has an output shaft 20.
A pinion 21 is attached to. This pinion 2
1 functions as the sun gear of the first stage planetary part attached to the second stage Yukiniso structure 4, and around this □ there are multiple W
An L star gear 43 is disposed, and the planetary gear 43 that meshes with the internal gear 42 formed integrally with the gear case 6 and the pinion 21 is the second stage 3? ! A sun gear 46 of the star portion is supported by an integrally provided planet carrier 44. As well as meshing with the sun gear 46, the above
The planet carrier 48 supporting the plurality of planet gears 47 that mesh with the planet gears 442 has a spline groove on its inner peripheral surface,
It is spline-coupled to the rear end of the spindle 5, which is provided with a chuck 8 at its front end.

A cam 62 is press-fitted and fixed to the spindle 5 which is rotatably and axially movably supported with respect to the gear case 6, and a cam 62 is loosely fitted to the spindle 5 and is freely rotatable and axially movable with respect to the spindle 5. A vibration generating mechanism is formed by the cam 61. These cams 61
．． The cam 62 has a claw having an inclined surface that generates sliding engagement on its opposing surface, and the cam 61 is rotated in the direction of engagement with the cam 62 by a spring 63 disposed between its back surface and the gear case 6. energized.

The output of the motor 2 is decelerated by the planetary mechanism 4 and sent to the spindle 5, which is the output part, and the chuck 8 on this spindle 5.
Rotating drill bit attached through. Also, when the pair of cams 61 and 62 come into contact with each other due to the reaction force when the drill bit is pressed against the surface to be drilled, the cam 62
rotates together with the spindle 5, whereas the cam 61 is prevented from rotating due to its engagement with the gear case 6, so that the cam 62 moves the cam 61 backward in order to overcome the inclined surface of the cam 61. Immediately after this, the cam 61 returns due to the bias of the spring 63 and the cam 62
give a blow to. As a result, axial vibrations are transmitted to the drill bit.

In this way, a vibrating drill that can rotate the output part and vibrate in the axial direction at the same time is used for drilling work in mortar or concrete. There are multiple stages of 1! between 2 and the output section. In the case where the L star mechanisms are arranged in series, both planetary mechanisms move under their own weight, as shown in FIG.
This results in a situation where the star gear 47, planetary gear 47, and carrier 48 rotate at their respective speeds while rubbing against each other, and the vibrations mentioned above are transmitted to their contact parts.
There was a problem in that impact was also generated at the meshing parts, making it impossible to rotate smoothly and reducing the drilling ability.

[Objective of the Invention 1] The present invention has been made in view of the above points, and its object is to provide a vibratory drill that can operate smoothly regardless of the drilling direction.

[Disclosure of the Invention 1 The present invention provides a vibration drill in which a plurality of stages of planetary mechanisms are arranged in series between a motor and an output section, and in which a ball is placed between rotating members that are arranged in the axial direction and whose end faces face each other. The ball is located between the rotating members arranged in the axial direction, and maintains the distance between the rotating members at a predetermined value or more with low frictional resistance.

The present invention will be described in detail below based on the illustrated embodiment.The overall configuration is similar to the conventional example described above, in which a two-stage planetary mechanism is arranged in series between the spindle 5 as an output section and the motor 2. However, here, the ball 7 is interposed between the pinion 21, which is a rotating member arranged in the axial direction, and the carrier 44, and the ball 7 is also interposed between the sun gear 46, which is integrated with the carrier 44, and the spindle 5. I am intervening.

As is clear from FIG. 2, the ball 7, which is aligned by the four parts 49 and 49 formed at the center of each end face of the two rotating members whose end faces face each other in the axial direction, A predetermined interval is maintained between the two. Therefore, regardless of whether the drilling direction is upward or downward, the carrier 44 located between the output shaft 2 of the motor 2 and the spindle 5 which is the output part has its axial position defined and its own weight Therefore, there is no possibility of contact between the planetary gear 47 and the carrier 44.

Further, in this embodiment, the axial position of the cam 61 in the vibration generating means is regulated in accordance with the operation of the switching handle 14 disposed at the tip of the main body casing 1. In other words, when generating vibrations,
As mentioned above, the cam 61 and the cam 62 are normally in the meshing position shown in FIG. A cylindrical switching plate 35 shown in FIG. 5 is disposed between the cam surface 34 provided on the inner surface of the switching handle 14 and the cam 61. Then, by bringing the protruding piece 36 protruding from the switching plate 35 into contact with the cam surface 34 and turning the switching handle 14, the cam surface 3
A cylindrical switching plate 3 that moves in the axial direction according to the ups and downs of 4.
5 presses the cam 61 with the entire circumference of one end and pushes it into the cam 62.
4 and 7, i.e., at the position shown in FIGS. 4 and 7. In this state, even if the cam 62 rotates together with the spindle 5, no sliding engagement occurs between the cam 62 and the cam 61, and therefore the spindle 5 only rotates without axial vibration.

When switching between rotation with vibration and rotation only,
By making the cylindrical switching plate 35 push the cam 61 around its entire circumference, the movement of the cam 61 does not tilt, and smooth switching is achieved.

In FIG. 1, 50.51 is a bearing, 52.53 is a thrust plate, and 54 is a dustproof rubber.

[Advantageous Effects of the Invention 1] As described above, in the present invention, the balls disposed between the rotating members that are arranged in the axial direction and whose end faces face each other maintain the distance between the two rotating members at a predetermined value or more with low frictional resistance. For this reason, when drilling upward or downward, the rotating member does not move under its own weight and increase the number of contact areas where friction occurs, and the impact of vibration prevents the rotating member from moving under its own weight. It allows for smooth rotation without generating impact, and not only improves drilling speed, but also reduces current consumption, which is a particular problem when using a battery as a power source.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of one embodiment of the present invention, Figure #S2 is a partial cross-sectional view of the same as above, Figure plIJ3 and Figure tJfJ4 are cross-sectional views showing the meshing state of a pair of cams as above, and Figure 5 is a switching plate as above. Figure 6 is a developed sectional view of the cam surface of the switching handle V, Figure 7 is a sectional view when only rotation is performed, Figure @8 is a sectional view of the conventional example, and Figure 9 is a sectional view of the cam surface of the switching handle. The figure is a cross-sectional view of the same upward drilling as above, in which 1 is the main body casing, 2 is the motor, 5 is the spindle as an output part, and 7
21 is a ball, 21 is a pinion as a sun gear, 42 is an internal gear, 43.47 is a planetary gear, 44.48 is a carrier, and 46 is a sun gear.

Claims (1)

[Claims] (1) A vibration drill in which a plurality of stages of planetary mechanisms are arranged in series between a motor and an output section, characterized in that a ball is interposed between rotating members that are arranged in the axial direction and whose end faces face each other. vibrating drill.