Impact tool and method for manufacturing impact wrench
A leak of a lubricant oil contained in a hammer case is reduced. An impact tool includes a motor including a rotor, a striker rotatable by the rotor, an anvil strikable by the striker, a hammer case having an opening, an anvil bearing fixed to the hammer case inside the hammer case and supporting the anvil, a seal between the anvil bearing and the anvil inside the hammer case, and a support facing the opening and supporting the seal from a front. The support has a smaller inner diameter than the opening.
1. An impact tool, comprising:
a motor including a rotor;
a striker rotatable by the rotor;
an anvil strikable by the striker;
a hammer case having an opening;
an anvil bearing fixed to the hammer case inside the hammer case, the anvil bearing supporting the anvil;
a seal between the anvil bearing and the anvil inside the hammer case; and
a support facing the opening and supporting the seal from a front, the support having a smaller inner diameter than the opening.
2. The impact tool according to claim 1 , wherein
the support faces the seal.
3. The impact tool according to claim 1 , wherein
the support surrounds at least a part of the anvil.
4. The impact tool according to claim 1 , wherein
the support includes a washer surrounding the anvil.
5. The impact tool according to claim 1 , wherein
the seal is at least partially in contact with the anvil, and
the support is spaced from the anvil.
6. The impact tool according to claim 1 , wherein
the support is fixed to at least one of the hammer case or the anvil bearing.
7. The impact tool according to claim 6 , wherein
the support is held between the anvil bearing and a part of the hammer case in a front-rear direction.
8. The impact tool according to claim 1 , wherein
the seal is supported by the anvil bearing.
9. The impact tool according to claim 2 , wherein
the support surrounds at least a part of the anvil.
10. The impact tool according to claim 2 , wherein
the support includes a washer surrounding the anvil.
11. The impact tool according to claim 3 , wherein
the support includes a washer surrounding the anvil.
12. The impact tool according to claim 2 , wherein
the seal is at least partially in contact with the anvil, and
the support is spaced from the anvil.
13. The impact tool according to claim 3 , wherein
the seal is at least partially in contact with the anvil, and
the support is spaced from the anvil.
14. The impact tool according to claim 4 , wherein
the seal is at least partially in contact with the anvil, and
the support is spaced from the anvil.
15. The impact tool according to claim 2 , wherein
the support is fixed to at least one of the hammer case or the anvil bearing.
16. The impact tool according to claim 3 , wherein
the support is fixed to at least one of the hammer case or the anvil bearing.
17. The impact tool according to claim 4 , wherein
the support is fixed to at least one of the hammer case or the anvil bearing.
18. The impact tool according to claim 5 , wherein
the support is fixed to at least one of the hammer case or the anvil bearing.
19. An impact tool, comprising:
a motor including a rotor;
a striker rotatable by the rotor;
an anvil strikable by the striker;
a hammer case accommodating the striker and a part of the anvil, the hammer case having an opening receiving the anvil;
an anvil bearing fixed to the hammer case inside the hammer case, the anvil bearing supporting the anvil;
a seal between the anvil bearing and the anvil inside the hammer case, the seal being retained by the anvil bearing; and
a support supporting the seal and having a smaller inner diameter than the opening.
20. A method for manufacturing an impact wrench, the method comprising:
manufacturing a first impact wrench including a first anvil shaft, a first hammer case, a first anvil bearing between the first anvil shaft and the first hammer case, and a first seal retained by a support separate from the first hammer case; and
manufacturing a second impact wrench including a second anvil shaft having a larger outer diameter than the first anvil shaft, the first hammer case, a second anvil bearing between the second anvil shaft and the first hammer case, and a second seal retained by the first hammer case.