JP-7856912-B2 - Work equipment

JP7856912B2JP 7856912 B2JP7856912 B2JP 7856912B2JP-7856912-B2

Inventors

岡部太郎

Assignees

工機ホールディングス株式会社

Dates

Publication Date: 20260512
Application Date: 20220928
Priority Date: 20211008

Claims (9)

Power source and Cutting tools and, A power transmission unit comprising: a cylindrical member connected to the drive source and the end tool, formed in a cylindrical shape with the front-rear direction as its axial direction, which rotates by the drive source to impart rotational force to the end tool; a rotating shaft positioned below the cylindrical member, meshing with the cylindrical member, which rotates in response to the driving force of the drive source to impart rotational force to the cylindrical member; and a striking element which operates within the cylindrical member by the drive source to impart striking force in the front-rear direction to the end tool; A case for housing at least the cylindrical member, A vibration reduction unit housed inside the case reduces the vibrations in the front-to-back direction that occur in the case, Equipped with, The vibration reduction unit is The guide member extending in the front-rear direction, A weight member supported by the guide member so as to be movable in the front-rear direction, A biasing member that biases the weight member in the front-rear direction, It consists of, The weight members are arranged such that, in a view in the front-to-back direction, at least a portion of the weight member is located below the upper end of the cylindrical member and above the lower end of the cylindrical member, and at least a portion of the weight member is located to the left of the right end and to the right of the left end of the cylindrical member , and the weight members are arranged side by side in the left-to-right direction such that the center of gravity of the weight members is located below the upper end of the cylindrical member and above the lower end of the cylindrical member . The biasing member is positioned in a work machine that is offset vertically from the center of gravity of the weight member when viewed in the front-to-back direction.
The power transmission member is further connected to the rotating shaft so as to be rotatable integrally with the rotating shaft, and transmits the driving force of the drive source to the tip tool via the rotating shaft and the cylindrical member , The work machine according to claim 1, wherein, in the front-to-back view, the power transmission member extends in the left-to-right direction below the cylindrical member, and at least a portion of the weight member is sandwiched in the up-to-down direction by the cylindrical member and the power transmission member.
The work machine according to claim 2, wherein the power transmission member has its vertical direction as the axial direction and transmits rotational force to the cylindrical member as a gear.
The work machine according to claim 1, wherein the weight member has a curved surface extending along the circumferential direction of the cylindrical member.
The work machine according to claim 1, wherein the weight member is supported by a pair of guide members arranged spaced apart in the vertical direction.
The work machine according to claim 1, wherein the biasing member is a coil spring attached to the guide member.
The work machine according to claim 1, wherein a pair of vibration-reducing units are provided inside the case, and the vibration-reducing units are arranged on one side and the other side in the left-right direction relative to the cylindrical member.
The work machine according to claim 7, wherein the weight members in a pair of vibration reduction sections are connected by a weight connecting section.
The vibration reduction unit has holders that support both longitudinal ends of the guide member, and the holders are pressed against the wall surface of the case by the biasing force of the biasing member, according to any one of claims 1 to 8.

Description

This invention relates to a work machine. In the work machine described in Patent Document 1 below, a gear housing is provided within the outer housing that constitutes the outer casing of the work machine. A power transmission mechanism is also provided within the gear housing, and this mechanism applies a striking force in the forward and backward directions to the tip tool. Furthermore, the work machine has a vibration reduction mechanism, which reduces vibrations generated by the power transmission mechanism. This can improve, for example, the workability for the operator. WO2015/166995 This is a longitudinal cross-sectional view from the right side showing a hammer drill according to this embodiment.Figure 1 is a perspective view taken from the left rear, showing the housing of the power transmission mechanism and vibration reduction mechanism in the inner case.Figure 2 is a top view showing the power transmission mechanism and vibration reduction mechanism housed in the inner case.This is a rear-view cross-sectional view (section 4-4 in Figure 3) showing the power transmission mechanism and vibration reduction mechanism housed in the inner case.Figure 2 is a magnified view of the vibration reduction mechanism housed in the inner case, as seen from the left rear.(A) is a perspective view showing an enlarged view of the vibration reduction mechanism on the right side shown in Figure 5, and (B) is a side view of the vibration reduction mechanism shown in (A) as seen from the left side.(A) is a perspective view showing the weight member of the vibration reduction mechanism shown in Figure 6(A), (B) is a side view of the weight member shown in (A) as seen from the left side, and (C) is a rear view of the weight member shown in (A) as seen from the rear side.This is a side view from the left, showing a modified example 1 of the vibration reduction mechanism used in the hammer drill according to this embodiment.This is a side view from the left, showing a modified example 2 of the vibration reduction mechanism used in the hammer drill according to this embodiment.This is a perspective view from the left rear, showing a modified example 3 of the vibration reduction mechanism used in the hammer drill according to this embodiment.Figure 10 is a cross-sectional view corresponding to Figure 4, showing the vibration reduction mechanism housed in the inner case. The hammer drill 10 as a work machine according to this embodiment will be described with reference to Figures 1 to 7. The hammer drill 10 is configured as a tool for drilling holes and performing other operations on a workpiece. The arrows UP, FR, and RH shown in the drawings as appropriate indicate the upper, front, and right sides of the hammer drill 10, respectively. In the following description, when using the directions of up/down, front/back, and left/right, unless otherwise specified, they refer to the up/down, front/back, and left/right directions of the hammer drill 10. The front/back direction corresponds to the first direction of the present invention, the up/down direction corresponds to the second direction of the present invention, and the left/right direction corresponds to the third direction of the present invention. The lower side corresponds to one side of the second direction of the present invention. Furthermore, hatching has been omitted in the drawings as appropriate for convenience. As shown in Figure 1, the hammer drill 10 comprises a housing 12, a motor 34 housed within the housing 12 as a drive source, and a power transmission mechanism 40 as a power transmission unit that transmits the driving force of the motor 34 to the cutting tool T. The hammer drill 10 also has a mode switching mechanism 66, and by operating the switching lever 67 of the mode switching mechanism 66, the transmission path to the cutting tool T in the power transmission mechanism 40 is switched, so that the hammer drill 10 switches between a hammer mode that applies impact force to the cutting tool T, and a hammer drill mode that applies rotational force and impact force to the cutting tool T. The hammer drill 10 also has a pair of left and right vibration reduction mechanisms 80 (see Figures 2 and 3) as vibration reduction units, which absorb vibrations in the front-rear direction that occur when the hammer drill 10 is in operation. The various components of the hammer drill 10 will be described below. (Regarding Housing 12) Housing 12 is formed in a hollow shape and constitutes the outer casing of the hammer drill 10. Housing 12 has a main body housing 14 and a handle 16 positioned on the rear side (one side in the front-rear direction) of the main body housing 14. The main body housing 14 extends in the front-rear direction, and the rear end of the main body housing 14 protrudes downward. The main body housing 14 is composed of a plurality of housing members. The handle 16 extends vertically, and its upper and lower ends are connected to the main body hous