Drum rotating apparatus for use on construction machines

a construction machine and rotating technology, applied in mechanical devices, electric devices, transportation and packaging, etc., can solve problems such as difficulty in mounting a negative type dry electromagnetic, pollution of the environment, and considerable degradation of the working environment, and achieve the effect of high reliability of the vehicle drive uni
US20090078528A1Inactive Publication Date: 2009-03-26NIHON KENKI CO LTD +1
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
NIHON KENKI CO LTD
Publication Date
2009-03-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

A support member which is securely fixed to a truck frame is constituted by a tubular body portion and a lid portion. A couple of dry electromagnetic brakes are located in a brake accommodation room within the tubular body portion. The support member is assembled with an electric motor. A drum member which accommodates a planetary reduction gear mechanism is rotatably mounted on the outer periphery of the support member through bearings. A floating seal is provided between the support member and the drum member, and a seal ring (45) is provided between an axial bore in the support member and a coupling shaft. Thus, the two dry electromagnetic brakes are accommodated in the support member, safely shielded from lubricant oil.
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Description

TECHNICAL FIELD

[0001] This invention relates to a drum rotating apparatus particularly suitable for use in a construction machine, for example, a vehicle drive unit for a hydraulic excavator, a hydraulic crane or a rope winch drum.BACKGROUND ART

[0002] Generally, vehicle drive units of construction machines such as hydraulic excavators, wheel loaders and the like employ a drum rotating apparatus for rotating a drum member on which a sprocket is mounted, for driving a crawler belt or for rotating a drum member on which a vehicle wheel is mounted. Also, a drum rotating apparatus is used on a rope winch which is mounted, for example, on a hydraulic crane for winding and unwinding a rope by rotating a drum member (e.g., see, for example, Japanese Patent Laid-Open No. 2000-9017, H1-153840 and S60-183498).

[0003] In this instant, the prior art drum rotating apparatuses are largely constituted by a hydraulic motor serving as a drive source, a reducing mechanism which is located on the inner per...

Claims

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