Komatsu Corporation

Teiji Yamamoto

Akira Hashimoto

Tsuyoshi Yoshida

Hiroyuki Nakaishi

Shota Murakami

Kazuo Maeda

Hiroshi Yamamoto

Kazutoshi Hori

Kenji Kooriyama

Kenji Kohriyama

Shigeru Yamamoto

Masatake Tamaru

Kazuki Kure

Kenji Taira

Tomihiro Tagawa

Hiroaki Watanabe

Kenichi Hisamatsu

Tatsuo Wada

Toshio Ibuki

Seiji Miyaura

Hiroaki Wantanabe

Tuyosi Yosida

Syouta Murakami

Masatake Komatsu Ltd Tamaru

A bearing device includes a bush and a pin inserted into the bush, whereby an outer peripheral face of the pin and an inner peripheral face of the bush contact each other. At least two oil reservoirs are formed on the outer peripheral face of the pin are and elongated along the length of the pin. The interval between the reservoirs is such that an angular range centered on the pin axial center between the first reservoir and the last reservoir is not more than a center angle of 40 degrees centered on the pin axial center. At least one of the reservoirs is configured by a plurality of punctate concave portions.

Bearing device and pin for bearing device

In a track with a rotatable bushing which is brought into engagement with a sprocket of a track-type vehicle, it is intended that strength is enhanced rationally by link functionality sharing and by combination of such assigned functional tasks for achieving further improvements in rotatable bushing function. To this end, a first bolt insertion hole provided in a track shoe mount surface of an external link and a second bolt insertion hole provided in a track shoe mount surface of an internal link are arranged on the same straight line, and a straight line connecting the first bolt insertion hole and the second bolt insertion hole is situated at a position more interior than a contact plane of the external link and internal link.

Track comprised or internal and external links

To provide a bearing device, which can be easily processed, and whereby, its durability is capable of being improved and a load (tractional force) can be remarkably increased till the burn-in occurs and a pin for the bearing device. The bearing device is provided with a bush and a pin to be inserted in this bush. When an external force is acting in a certain direction, the bush and the pin are relatively rocked, and a slidable range H is formed, in which an outer peripheral face of the pin and an inner peripheral face of the bush partially and slidably contact with each other. An oil reservoir is provided at the side of the pin in order to prevent a no-lubrication portion, to which no lubrication oil is supplied, from being formed in the slidable range H.

In a track with a rotatable bushing which is brought into engagement with a sprocket of a track-type vehicle, it is intended that strength is enhanced rationally by link functionality sharing and by combination of such assigned functional tasks for achieving further improvements in rotatable bushing function. To this end, a track link comprises a combination of an external link and an internal link; a coupler pin hole is provided through the external link; a bushing hole is provided through the internal link, and the thickness dimension of a bushing hole formation part of the internal link is made greater than that of a coupler pin formation part of the external link.

Track having rotatable bushing and link for the same

The invention provides a support roller of a crawler type traveling apparatus which can prevent a rotational resistance from being increased by the soil or the like, and can stably achieve a function serving as the support roller for a long time. The invention provides a support roller of a crawler type traveling apparatus provided with a shaft (), a support portion () supporting a center portion in an axial direction of the shaft (), and a pair of rollers () respectively arranged in both end portions () of the shaft () and rotating together with the shaft (). A mounting seat portion () of the support portion () to a track frame () is set within a range (S) of a roller outer shape formed by a pair of rollers () in a plan view.

Support roller of crawler type traveling apparatus

The invention provides a shaft for a roller wheel which is excellent in strength and can achieve a weight saving. The invention provides a shaft for a roller wheel which rotatably supports a roller () outward fitted between both end portions () in a state in which both end portions () are fixed, and receives a load in a diametrical direction via the roller (). Recess portions () are provided on a side to which the load is not applied, on an outer peripheral surface corresponding to the roller (). The load applying direction is a vertical direction. A cross sectional shape of the shaft in the recess portions () is formed in a shape which is constituted by an upper circular arc portion () on an upper side, a lower circular arc portion () on a lower side, and a vertical connection portion () passing through a shaft axis (O) and connecting the upper circular arc portion () to the lower circular arc portion ().

Shaft for roller wheel

Vibration or the like is prevented for long-term use by normalizing, with operation continuing, a tread of a crawler belt link through grinding in an early stage where uneven wear such as corrugated wear occurs. With a crawler belt of a crawler vehicle wound, an abrasive plate for grinding the tread of the crawler belt link is disposed to contact the tread. While the crawler vehicle does normal traveling work, the abrasive plate corrects the tread of the crawler belt link for the uneven wear. The vibration of a vehicle body can thus be prevented during travel with no uneven wear produced.

Crawler belt link grinding system and crawler structure

A crawler track tension adjusting device is provided in which a driving unit having a closed structure carries out automatic tension adjustment in response to a control signal to create optimum tension on a crawler belt. The crawler track tension adjusting device includes a tension adjusting cylinder which is operable to control the tension and is actuated by a hydraulic pump that is driven by a motor. An electromagnetic direction selector valve is disposed in an oil pipeline for connecting the hydraulic pump to the tension adjusting cylinder, and a hydraulic sensor for detecting the operating condition of the tension adjusting cylinder is disposed in the hydraulic circuit in which the tension adjusting cylinder, the hydraulic pump and the selector valve are provided. The hydraulic sensor is connected to a controller to operate the hydraulic pump and the direction selector valve so as to control the tension adjusting cylinder.

Crawler track tension adjusting device

A seal assembly has simple assembly structures, and provides secure sealing effects. A crawler-track connection structure allows the seal assembly to be easily mounted, and securely prevents overflow of a lubricant and the like to the outside. A pair of seal rings () and () individually having lip portions () and () are disposed such that each of the lip portions () and () protrudes in a direction opposing an axial direction, and a load seal ring () is compressed and inserted between the pair of seal rings () and (). The load seal ring () exerts reaction forces on the pair of lip portions () and () outwardly in the axial direction.

Seal assembly and crawler-track connection structure

An equalizer bar itself serving as a suspension device of a track-type vehicle has spring effects imparted through torsional deformation relative to vertical oscillatory movements of track frames. Arm portions are fixed in directions opposite to each other in two ends of an equalizer bar main body. Free end portions of the arm portions are individually supported in the track frames to be rotatable in directions opposite to each other. The track frames are therefore regulated in the magnitudes of oscillatory movements according to the spring effects of the equalizer bar main body, whereby travel-time oscillations, oscillatory movements, and/or the like of the vehicle body are sufficiently restrained.

Equalizer bar for a track-type vehicle

To provide a roller for a crawler type traveling vehicle. The manufacture of this roller is streamlined by simplifying a structure for holding a seal mechanism between a bearing part and the outside and a thrust bearing and facilitating working while eliminating the need for welding. Roller pieces shaped to be axially separable are combined with a support shaft and formed integrally at a parting section (including a stepped engagement part and an external engagement part) by press fitting. The support shaft is provided with a projection for restraining the left and right roller pieces from moving in an axial direction.

Roller for a crawler type traveling vehicle

Sprocket part for a bulldozer

The present invention is an elastic flat tread which can prevent an elastic solid from cracking even if the vehicle runs on a protruding object during traveling. For this purpose, the elastic flat tread is provided with any core () of a core () attached to a link () and a core () attached to a metal plate (A) which is attached to a link (), and end portions () in a longitudinal direction of the aforesaid any core () are bent toward the side not in contact with the around.

Growing community of inventors

Hirakata, Japan

Teiji Yamamoto