JPH0735028B2 - Rotational impact transmission member of impact tool - Google Patents
Rotational impact transmission member of impact toolInfo
- Publication number
- JPH0735028B2 JPH0735028B2 JP63051847A JP5184788A JPH0735028B2 JP H0735028 B2 JPH0735028 B2 JP H0735028B2 JP 63051847 A JP63051847 A JP 63051847A JP 5184788 A JP5184788 A JP 5184788A JP H0735028 B2 JPH0735028 B2 JP H0735028B2
- Authority
- JP
- Japan
- Prior art keywords
- tool
- transmission member
- striking
- impact
- rotary impact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は電気ハンマードリル等の打撃工具の回転打撃伝
達部材に関するものである。Description: FIELD OF THE INVENTION The present invention relates to a rotary impact transmission member for an impact tool such as an electric hammer drill.
〔発明の背景〕 従来の回転打撃伝達部材は、工具の受容部の断面形状が
第４図に示す如く、工具シャンク部六角よりやや大なる
正六角形である。第４図において、工具の嵌合状態を二
点鎖線にて示す。また、Ａは回転打撃伝達部材及び工具
の回転方向を示す。第４図に示す様に、工具は回転打撃
伝達部材により回転トルクを受ける。この回転トルクは
二面巾にて伝達されるが、回転打撃伝達部材に工具を受
容するため、工具の二面巾は回転打撃伝達部材の二面巾
よりも寸法を小さくしなければならない。従って両者の
間に生じるスキマのために工具の六角シャンク部は回転
打撃伝達部材の受容部に面接触せず、六角の角部が回転
打撃伝達部材と線接触してしまう。その結果、トルクに
よって生ずる面圧が大きくなるため、すぐに工具の摩耗
がはじまり、それに伴い両者の摩耗が急速に進んでしま
う欠点を有している。BACKGROUND OF THE INVENTION In the conventional rotary impact transmission member, as shown in FIG. 4, the cross-sectional shape of the receiving portion of the tool is a regular hexagon which is slightly larger than the hexagon of the tool shank portion. In FIG. 4, the fitting state of the tool is shown by a chain double-dashed line. Further, A indicates the rotation direction of the rotary impact transmission member and the tool. As shown in FIG. 4, the tool receives rotational torque by the rotational impact transmission member. This rotational torque is transmitted with a width across flats, but since the tool is received by the rotary impact transmission member, the width across flats of the tool must be smaller than the width across flats of the rotary impact transmission member. Therefore, the hexagonal shank portion of the tool does not make surface contact with the receiving portion of the rotary impact transmission member due to the gap between the two, and the hexagonal corner portion makes line contact with the rotary impact transmission member. As a result, the surface pressure generated by the torque becomes large, so that the wear of the tool starts immediately and the wear of both of them rapidly progresses.
本発明の目的は、上記欠点をなくし、工具を回転打撃伝
達部材と面接触させ、両者の耐摩耗性を向上させ、寿命
を向上させることである。An object of the present invention is to eliminate the above-mentioned drawbacks, to bring a tool into surface contact with a rotary impact transmission member, to improve wear resistance of both, and to improve life.
本発明は、打撃子から工具への回転運動の伝達が面接触
によって行われるように回転打撃伝達部材の六角溝部形
状を工夫したものである。The present invention has devised the hexagonal groove shape of the rotary impact transmission member so that the rotary motion is transmitted from the striker to the tool by surface contact.
第１図において、１は工具、２は工具を保持するフロン
トカバ、６はピストンの往復動による空気圧により駆動
される打撃子、４は回転打撃伝達部材、５は回転打撃伝
達部材４にモーターからギヤを介した回転運動を伝達す
るシリンダ、６は回転打撃伝達部材４の工具受容部、７
はトルク伝達面である。In FIG. 1, 1 is a tool, 2 is a front cover for holding the tool, 6 is a striker driven by air pressure due to reciprocating movement of a piston, 4 is a rotary impact transmission member, and 5 is a rotary impact transmission member 4 from a motor. A cylinder for transmitting rotary motion through a gear, 6 is a tool receiving portion of the rotary impact transmission member 4, and 7
Is a torque transmission surface.
第２図は、第１図のＡ−Ａ断面図で、工具受容部内周
は、工具シャンク部の正六角形の対辺距離よりやや大な
る対辺距離Ｂと、同じく工具シャンク部の正六角形の対
辺距離に等しい対辺距離Ｂ′を持った各２辺が図のよう
に交互に形成する星形12辺形である。対辺距離Ｂ′を形
成する平面部がトルク伝達面７になる。FIG. 2 is a sectional view taken along the line AA in FIG. 1, in which the inner circumference of the tool receiving portion is slightly larger than the opposite side distance B of the regular hexagon of the tool shank portion and the opposite side distance of the regular hexagon of the tool shank portion. Is a star-shaped dodecagon with two opposite sides having an opposite side distance B'equal to each other alternately formed as shown in the figure. The flat surface portion forming the opposite distance B ′ serves as the torque transmission surface 7.
工具１を回転打撃伝達部材４に挿入する時には、対辺距
離Ｂの辺の形成する六角形は工具１よりやや大なのでス
ムーズに嵌合できる。動作時において、回転打撃伝達部
材４がＡの方向に回転し、工具１は対辺距離Ｂ′のトル
ク伝達面７と密着し、トルクが伝達される。工具１とト
ルク伝達面７とは同一寸法の六角形状なので、広い面接
触となり、トルク伝達で生じる面圧を下げることがで
き、耐摩耗性を向上させ、工具１及び回転打撃伝達部４
の寿命をのばすことができる。耐辺距離Ｂ′の長さが、
工具の対辺距離よりやや小さい場合は、最初六角の中央
部における線接触であるが、摩耗するにつれて面接触が
広くなり、等しい対辺距離Ｂ′と同様の効果を得ること
ができる。When the tool 1 is inserted into the rotary impact transmission member 4, the hexagon formed by the side having the opposite side distance B is slightly larger than the tool 1, so that the tool 1 can be fitted smoothly. During operation, the rotary impact transmission member 4 rotates in the direction A, the tool 1 comes into close contact with the torque transmission surface 7 at the opposite side distance B ′, and torque is transmitted. Since the tool 1 and the torque transmission surface 7 have the same size hexagonal shape, a wide surface contact can be achieved, the surface pressure generated by the torque transmission can be reduced, wear resistance can be improved, and the tool 1 and the rotary impact transmission portion 4 can be improved.
The life of can be extended. The length of the withstand side distance B'is
When the distance between the opposite sides of the tool is slightly smaller, the line contact is initially made in the central portion of the hexagon, but the surface contact becomes wider as the tool wears, and the same effect as the equal opposite side distance B ′ can be obtained.
第３図の如く、星形の凹辺を円弧で置換しても同様の効
果が得られる。As shown in FIG. 3, the same effect can be obtained by replacing the concave side of the star with an arc.
以上説明した如く、本発明による打撃工具は、工具と回
転打撃伝達部材が面接触するために、被荷重面の面圧が
小さくなり、両者の摩耗寿命を向上することができる。As described above, in the impact tool according to the present invention, since the tool and the rotary impact transmitting member are in surface contact with each other, the surface pressure of the surface to be loaded is reduced, and the wear life of both can be improved.
第１図は本発明を備えたハンマードリルの要部縦断面、
第２図、第３図は第１図の夫々Ａ−Ａ断面図である。第
４図は従来例を示す縦断面図である。 １は工具、２はフロントカバ、３は打撃子、４は回転打
撃伝達部材、５はシリンダ、６は回転打撃伝達部材の工
具受容部、７は工具受容部のトルク伝達面、Ａは回転打
撃伝達部材及び工具の回転方向を示す。Ｂは工具受容部
の対辺距離である。FIG. 1 is a longitudinal sectional view of a main part of a hammer drill equipped with the present invention,
2 and 3 are sectional views taken along line AA of FIG. 1, respectively. FIG. 4 is a vertical sectional view showing a conventional example. 1 is a tool, 2 is a front cover, 3 is a striker, 4 is a rotary impact transmitting member, 5 is a cylinder, 6 is a tool receiving portion of the rotary impact transmitting member, 7 is a torque transmitting surface of the tool receiving portion, and A is a rotary impact. The rotation direction of a transmission member and a tool is shown. B is the distance between opposite sides of the tool receiving portion.
Claims (1)
される打撃子を有し、工具に打撃及び回転を与える打撃
工具で、工具と打撃子の中間に有って、工具の六角シャ
ンク部を受容し、回転トルクを与え、かつ打撃子による
打撃力を伝達する回転打撃伝達部材を有するものにおい
て、上記回転打撃伝達部材の工具受容部内周は対辺距離
が工具シャンク部の正六角形の対辺距離よりやや大なる
２辺と、等しいやや小なる２辺とで、交互に成形する星
形12辺形に成していることを特徴とする打撃工具。1. A striking tool having a striking element driven by the reciprocating motion of a piston and air pressure, and imparting striking and rotation to the tool. The striking tool is located between the tool and the striking element and receives a hexagonal shank portion of the tool. However, in the one having a rotary impact transmission member for giving a rotational torque and transmitting the impact force by the impact element, the inner circumference of the tool receiving portion of the rotary impact transmission member has the opposite side distance slightly longer than the opposite side distance of the regular hexagon of the tool shank portion. A striking tool characterized by forming a 12-sided star shape in which two large sides and two equally smaller sides are formed alternately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63051847A JPH0735028B2 (en) | 1988-03-04 | 1988-03-04 | Rotational impact transmission member of impact tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63051847A JPH0735028B2 (en) | 1988-03-04 | 1988-03-04 | Rotational impact transmission member of impact tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01228781A JPH01228781A (en) | 1989-09-12 |
| JPH0735028B2 true JPH0735028B2 (en) | 1995-04-19 |
Family
ID=12898244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63051847A Expired - Lifetime JPH0735028B2 (en) | 1988-03-04 | 1988-03-04 | Rotational impact transmission member of impact tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0735028B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005074622A (en) * | 2003-09-01 | 2005-03-24 | Robert Bosch Gmbh | Tool holder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE526285C2 (en) * | 2004-10-22 | 2005-08-16 | Atlas Copco Rock Drills Ab | drill Bushing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4532085Y1 (en) * | 1966-10-07 | 1970-12-09 | ||
| JPS5047099U (en) * | 1973-08-24 | 1975-05-10 |
-
1988
- 1988-03-04 JP JP63051847A patent/JPH0735028B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005074622A (en) * | 2003-09-01 | 2005-03-24 | Robert Bosch Gmbh | Tool holder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01228781A (en) | 1989-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |