JPS6034815Y2 - shaft mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for non-rotatably attaching a shaft on which a rotating body such as a pulley is fitted to a boss portion of its support member.

When a shaft is non-rotatably mounted to the boss of its support member in this way, generally the shaft is inserted into the boss, and a bolt that is threaded into a tapped hole provided at one end of the shaft connects the bolt to the boss. Fastening to the supporting member is done through a washer inserted between the end face, but sometimes the shaft rotates when tightening the bolt, making it impossible to tighten the bolt. A part of the bolt is made into a rectangular cross section and a wrench is applied to this to prevent the bolt from slipping while tightening the bolt.

However, forming part of the shaft with a square cross section reduces the strength of the shaft, so the shaft must be made thicker, and additional space is required to accommodate the square cross section. Therefore, the structure is complicated and large, and the bolts must be tightened with a wrench applied to the rectangular cross section of the shaft, making assembly and disassembly difficult.

In the present invention, when the shaft inserted into the boss hole in the boss portion of the support member is attached by tightening the bolt that is threaded into the tap hole at one end of the shaft, the tap hole in the shaft is made eccentric from the axis. On the other hand, a washer inserted between the bolt and the end face of the boss is provided with a protrusion that contacts the outer peripheral surface of the boss to prevent the shaft from rotating when the bolt is tightened.

The following describes an embodiment in which the present invention is applied to a support shaft for a wheel in a crawler-type traveling device of a combine. In the figure, 1 is a crawler-type traveling device, and 2 is a vehicle body supported by the traveling device 1. A threshing device 3 is installed on the upper surface of the vehicle body frame 2, and a reaping pretreatment device 4 is installed in the front part of the vehicle body frame 2 to transport the husks to the threshing device 3 after reaping them. It is being

The traveling device 1 consists of a truck frame 5 and a pair of left and right rubber belt type crawlers 6, and both crawlers 6 are installed between a drive wheel 7 attached to the front end of the truck frame 5 and an idler pulley 8 attached to the rear end. A plurality of wheels 9 are attached to the track frame 5 at appropriate intervals to guide the crawler 6 while carrying the load on the vehicle body.

Each wheel 9 is rotatably fitted onto the tip of a shaft 10 via a ball bearing 11, and the shaft 10 is fitted into a boss portion 12 integrally provided on a support member such as the track frame 5. ,
A washer 15 is inserted between the end face of the boss portion 12 and a bolt 14 that is screwed into a tapped hole 13 bored in the axial direction at one end of the shaft 10, and when the bolt 14 is tightened, the tapped hole 13 is inserted. The washer 15 is bored at a position offset by an appropriate dimension e from the center point O of the shaft 10.
is provided with a protrusion 16 that contacts the outer peripheral surface of the boss portion 12 at a position substantially in the same direction as the eccentric direction of the tapped hole 13.

With this configuration, if the shaft 10 rotates in the same direction when tightening the bolt 14, the bolt 14 will rotate in the same direction as the shaft 10.
The bolt 14 rotates in a circle with a radius of the eccentric distance e as the center, and the seat plate 15 through which the bolt 14 passes also rotates in the same manner, so that the protrusion 16 provided on the washer 15 As the shaft 10 twists, it is strongly pressed against the outer peripheral surface of the boss portion 12, and as a result, the shaft 10 is prevented from twisting, and the bolt 14 can be tightened without causing the shaft 10 to twist. Further, even when the bolt 14 is rotated in the direction of loosening it, the shaft 10 similarly does not rotate.

Therefore, according to the present invention, it is possible to reliably prevent the shaft from twisting around, and there is no need to provide the shaft with a rectangular cross-section for attaching a wrench as in the conventional case, so the shape of the shaft is simple and the shaft can be thinned. Moreover, there is no need for space to hang a wrench on the shaft, and the shaft can be installed and removed simply by turning the bolt, eliminating the need to use a wrench to adjust the rotation of the shaft as in the past. This has the effect that the installation and removal of the shaft can be done extremely easily and quickly without requiring the trouble of turning the bolt with another wrench in the prevented state.

[Brief explanation of the drawing]

Figure 1 is a side view of the combine, Figure 2 is the same as in Figure 1.
The enlarged cross-sectional view in FIG. 3 is a cross-sectional view taken along the line -■ in FIG. 2. 5...Truck frame, 9...Rolling wheel, 10...Shaft, 12...Boss part, 15
...Washer, 13...Tap hole, 14.
...Bolt, 16...Protrusion.

Claims (1)

[Claims for Utility Model Registration] A shaft on which a rotating body such as a pulley is rotatably fitted is inserted into a boss portion of its support member, and the boss is inserted into a tapped hole drilled in the axial direction at one end of the shaft. Part'. In a bolt that tightens a washer that is in contact with the end face of the shaft, the tapped hole is appropriately eccentric from the axis of the shaft, and the washer has a bolt that is set at a position approximately in the same direction as the eccentric direction of the tapped hole. A shaft mounting device that has a protrusion that comes into contact with the outer circumferential surface of the boss.