Drive transmission device and construction machine
AssigneeNabtesco Corporation
InventorsKazuki Hisada, Etsuro Komori
Life of this patent
Estimating the term…
Abstract
A drive transmission device according to one embodiment of the disclosure includes: an arm having a motor that generates a rotational force; a speed reducer that is provided in the arm and has a carrier for decelerating rotation of the motor and outputting the decelerated rotation; a bucket fixed to the carrier by a reamer bolt, the reamer bolt being inserted in a bracket through hole formed in the bucket; and a resin bush provided between an internal surface of the bracket through hole and an external lateral surface of the reamer bolt. The mechanical strength of the resin bush is lower than the mechanical strength of the bucket and the mechanical strength of the reamer bolt.
Claims5
A drive transmission device, comprising:
- a first member having a drive source that generates a rotational force;
- a speed changer provided in the first member, the speed changer having an output portion that changes a speed of rotation of the drive source and outputting a speed-changed rotation;
- a second member fixed to the output portion with a fixing member, the second member having a through hole for receiving the fixing member therein;
- and
- a buffer member disposed between an inner surface of the through hole and an outer lateral surface of the fixing member;
- wherein a mechanical strength of the buffer member is lower than a mechanical strength of the second member and a mechanical strength of the fixing member,
- wherein the fixing member includes:
- a bolt inserted in the through hole;
- and
- a hollow pin fitted between the bolt and the buffer member, and
- wherein the output portion includes:
- a female thread portion for receiving the bolt engaged therewith;
- and
- a fitting recess for receiving one end of the hollow pin situated one side in its axial direction.
A construction machine, comprising:
- a vehicle body;
- a first member provided in the vehicle body and having a drive source that generates a rotational force;
- a speed changer provided in the first member, the speed changer having an output portion that changes a speed of rotation of the drive source and outputting a speed-changed rotation;
- a second member fixed to the output portion with a fixing member, the second member having a through hole for receiving the fixing member therein;
- and
- a buffer member provided between an internal surface of the through hole and an external lateral surface of the fixing member,
- wherein a mechanical strength of the buffer member is lower than a mechanical strength of the second member and a mechanical strength of the fixing member,
- wherein the fixing member includes:
- a bolt inserted in the through hole;
- and
- a hollow pin fitted between the bolt and the buffer member, and
- wherein the output portion includes:
- a female thread portion for receiving the bolt engaged therewith;
- and
- a fitting recess for receiving one end of the hollow pin situated one side in its axial direction.
Dependencies are inferred from the claim text.