Gear device

1. A gear device for transmitting a rotational force at a predetermined speed reduction ratio between a pair of counterpart members, the gear device comprising:

an outer cylinder fixable to one of the counterpart members and having a plurality of pin grooves in an inner peripheral surface thereof, the plurality of pin grooves extending in an axial direction of said outer cylinder;

a plurality of inner-tooth pins fitted into the plurality of pin grooves of the outer cylinder, respectively;

a carrier housed inside the outer cylinder and fixable to the other counterpart member;

a crankshaft rotatably supported on the carrier;

an oscillating gear having outer teeth meshed with the plurality of inner-tooth pins and configured to oscillate in conjunction with rotation of the crankshaft, while the outer teeth are meshed with the plurality of inner-tooth pins;

a restriction member configured to restrict movement of the plurality of inner-tooth pins in the axial direction; and

a bore formed in an end surface of the outer cylinder that faces the axial direction of the outer cylinder,

wherein the restriction member is mounted to the outer cylinder on an outer side of the outer cylinder, and

wherein the restriction member has a protrusion inserted into the bore in the end surface of the outer cylinder.

2. The gear device according to claim 1 , wherein a length of the outer cylinder in the axial direction is equal to a length of the plurality of inner-tooth pins.

3. The gear device according to claim 1 , wherein the restriction member is formed in a ring shape.

4. The gear device according to claim 2 , wherein the restriction member is formed in a ring shape.

5. The gear device according to claim 1 , further comprising: a seal member disposed at a position on an outer side in a radial direction of the outer cylinder with respect to the bore in the end surface of the outer cylinder and configured to prevent a liquid from leaking to the outer side in the radial direction of the outer cylinder.

6. The gear device according to claim 2 , further comprising:

a seal member disposed at a position on an outer side in a radial direction of the outer cylinder with respect to the bore in the end surface of the outer cylinder and configured to prevent a liquid from leaking to the outer side in the radial direction of the outer cylinder.

7. The gear device according to claim 3 , further comprising:

a seal member disposed at a position on an outer side in a radial direction of the outer cylinder with respect to the bore in the end surface of the outer cylinder and configured to prevent a liquid from leaking to the outer side in the radial direction of the outer cylinder.

8. The gear device according to claim 4 , further comprising:

a seal member disposed at a position on an outer side in a radial direction of the outer cylinder with respect to the bore in the end surface of the outer cylinder and configured to prevent a liquid from leaking to the outer side in the radial direction of the outer cylinder.

9. The gear device according to claim 1 , further comprising: a bolt configured to fix the restriction member to an end surface of the outer cylinder which faces the axial direction.

10. The gear device according to claim 2 , further comprising: a bolt configured to fix the restriction member to an end surface of the outer cylinder which faces the axial direction.

11. The gear device according to claim 3 , further comprising: a bolt configured to fix the restriction member to an end surface of the outer cylinder which faces the axial direction.

12. The gear device according to claim 4 , further comprising: a bolt configured to fix the restriction member to an end surface of the outer cylinder which faces the axial direction.

13. A gear device for transmitting a rotational force at a predetermined speed reduction ratio between a pair of counterpart members, the gear device comprising:

an outer cylinder fixable to one of the counterpart members and having a plurality of pin grooves in an inner peripheral surface thereof, the plurality of pin grooves extending in an axial direction of said outer cylinder;

a plurality of inner-tooth pins fitted into the plurality of pin grooves of the outer cylinder, respectively;

a carrier housed inside the outer cylinder and fixable to the other counterpart member;

a crankshaft rotatably supported on the carrier;

an oscillating gear having outer teeth meshed with the plurality of inner-tooth pins and configured to oscillate in conjunction with rotation of the crankshaft, while the outer teeth are meshed with the plurality of inner-tooth pins;

a restriction member configured to restrict movement of the plurality of inner tooth pins in the axial direction;

a bolt configured to fix the restriction member to an end surface of the outer cylinder which faces the axial direction; and

a transmission gear fixed to an end portion of the crankshaft,

wherein the restriction member is mounted to the outer cylinder on an outer side of the outer cylinder,

a head portion of the bolt is disposed on one of end surfaces of the outer cylinder which is on an opposite side to the transmission gear.

14. A gear device for transmitting a rotational force at a predetermined speed reduction ratio between a pair of counterpart members, the gear device comprising:

an outer cylinder fixable to one of the counterpart members and having a plurality of pin grooves in an inner peripheral surface thereof, the plurality of pin grooves extending in an axial direction of said outer cylinder;

a plurality of inner-tooth pins fitted into the plurality of pin grooves of the outer cylinder, respectively;

a carrier housed inside the outer cylinder and fixable to the other counterpart member;

a crankshaft rotatably supported on the carrier;

an oscillating gear having outer teeth meshed with the plurality of inner-tooth pins and configured to oscillate in conjunction with rotation of the crankshaft, while the outer teeth are meshed with the plurality of inner-tooth pins;

a restriction member configured to restrict movement of the plurality of inner tooth pins in the axial direction; and

a bolt configured to fix the restriction member to an end surface of the outer cylinder which faces the axial direction;

wherein the restriction member is mounted to the outer cylinder on an outer side of the outer cylinder,

wherein the restriction member comprises a first restriction member and a second restriction member disposed on end surfaces of the outer cylinder on both sides thereof in the axial direction, respectively,

wherein the first restriction member has a through hole into which a shaft portion of the bolt can be inserted, and

wherein the second restriction member has a female screw hole that can be screwed onto a male screw portion formed at a distal end of the shaft portion of the bolt.