Working machine

Patent metadata

Field	Value
Publication number	US-12030129-B2
Application number	US-201917417748-A
Country	US
Kind code	B2
Filing date	Nov 29, 2019
Priority date	Dec 28, 2018
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

A power tool includes a prime mover, an output shaft that extends along a first direction and retains a tip tool and is driven by the prime mover, a support member that supports the output shaft to be drivable, a gear that rotates around an axis extending in a second direction crossing the first direction and transmits a power of the prime mover to the output shaft, and a gear cover that accommodates the gear and the support member. Inside the gear cover, a lubricant retention portion capable of retaining a lubricant is arranged at a side of the support member, and the lubricant retention portion is partitioned from a gear accommodation portion that accommodates a gear by a wall extending in a direction intersecting an extending direction of the output shaft in the gear cover.

First claim

The invention claimed is:

1. A power tool, comprising:
a prime mover;
an output shaft that extends along a first direction and retains a tip tool and is driven by the prime mover;
a support member that supports the output shaft to be drivable;
a gear that rotates around an axis extending in a second direction crossing the first direction and transmits a power of the prime mover to the output shaft; and
a gear cover that accommodates the gear and the support member, wherein
inside the gear cover, a lubricant retention portion capable of retaining a lubricant is arranged at a side of the support member, and
the lubricant retention portion is partitioned from a gear accommodation portion that accommodates a gear by a wall extending in a direction intersecting an extending direction of the output shaft in the gear cover,
wherein the lubricant retention portion has a filling portion having a container shape for the lubricant to be capable of being filled in, and the filling portion and the support member are covered by the gear cover on both sides in the second direction, and
wherein the gear is arranged on one side in the second direction with respect to the output shaft, the filling portion is arranged inside the gear cover on the one side in the second direction with respect to the support member, and a guide surface is arranged which guides the lubricant to move from the filling portion toward the support member by driving the prime mover within the gear cover.

2. The power tool according to claim 1 , wherein the gear cover is equipped with a holder that is configured to swing about a swing axis extending in a third direction perpendicular to both of the first direction and the second direction and that is capable of moving the lubricant retained in the filling portion in a direction from the gear toward the output shaft side when the prime mover is driven.

3. The power tool according to claim 2 , wherein the filling portion is located between an inner surface of the gear cover and the support member.

4. The power tool according to claim 3 , wherein the guide surface is an inclined surface gear
that is inclined with respect to the first direction.

5. The power tool according to claim 2 , wherein the support member is fixed to a holder, and the holder is configured to swing about a swing axis extending in a third direction perpendicular to both of the first direction and the second direction gear, and
the holder has a contact portion that is capable of contacting the lubricant retained in the filling portion.

6. The power tool according to claim 5 , wherein the contact portion is a fixing member for fixing the support member on the gear.

7. The power tool according to claim 2 , wherein the filling portion is a separated member separated from the gear cover, and a bottom of the filling portion is arranged between an inner surface of the gear cover and the support member in the second direction.

8. The power tool according to claim 7 , wherein the filling portion has an extending wall facing the gear,
the gear cover has an inner wall connected to the extending wall, and
the wall has the extending wall and the inner wall.

9. The power tool according to claim 1 , wherein the guide surface comprises a side wall arranged in the filling portion and extending close to the support member.

10. The power tool according to claim 1 , wherein the output shaft extends along the first direction, and
the lubricant retention portion is positioned at one side with respect the gear accommodating portion in the first direction.

11. The power tool according to claim 1 , wherein the output shaft extends along a front-rear direction,
the output shaft retains the tip tool at a front end thereof, and
the lubricant retention portion is positioned at a rear side with respect to the gear accommodating portion in the front-rear direction.

12. A power tool, comprising:
a prime mover;
an output shaft that retains a tip tool and reciprocates in a first direction by the prime mover;
a support member that supports the output shaft in a reciprocating manner;
a holder to which the support member is fixed;
a gear that transmits a power of the prime mover to the output shaft; and
a gear cover that accommodates the gear and the holder, wherein
at least a part of the holder reciprocates in a second direction perpendicular to the first direction by swinging the holder about a swing axis extending in a third direction perpendicular to both of the first direction and the second direction, and
the gear cover is equipped with
a filling portion in which a lubricant is retained,
wherein the at least a part of the holder which moves along the second direction contacts the lubricant retained in the filling portion when the prime mover is driven.

13. The power tool according to claim 12 , further comprising an inclined surface that is inclined with respect to the first direction, and is close to the output shaft, the inclined surface is provided on a side of the support member in the third direction and is connected to the filling portion.

14. The power tool according to claim 12 , wherein
the holder has a contact portion that is capable of contacting the lubricant retained in the filling portion and is positioned near the filling portion with respect to the support member.

15. The power tool according to claim 12 , wherein the holder is capable of causing the lubricant to move in a direction opposite to a direction of gravity when the second direction is made to match with the direction of gravity.

16. The power tool according to claim 12 , wherein the filling portion has a container shape that opens toward the output shaft and has a bottom located between the output shaft and a rotating shaft in second direction.

Assignees

• Koki Holdings Co Ltd

Inventors

• Nakano Ryosuke
• Yokoyama Yoshikazu
• Inui Ken

Classifications

• F16H57/0464

  Grease lubrication · CPC title

• F16H57/0434

  relating to lubrication supply, e.g. pumps; Pressure control · CPC title

• F16H57/0423

  Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes · CPC title

• F16H57/0408

  Exchange, draining or filling of transmission lubricant · CPC title

• B23D51/10

  for hand-held or hand-operated devices · CPC title