JPS581093Y2 - Tractor safety frame mounting structure - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a safety frame mounting structure for an agricultural tractor.

In agricultural tractors, a safety frame is used to prevent rotation of the tractor in case of rearward overturning and sideward overturning, thereby protecting human beings.

Therefore, the safety frame attachment part needs to be designed to be strong enough to withstand shocks such as when falling.

On the other hand, conventionally, the rear axle fender is fixed to the rear axle housing with U bolts.

For example, the rear axle housing 1 shown in FIG. 1 has a complicated cross-sectional shape, partially cylindrical and partially polygonal, and uses an overhang 2 on the outer periphery to form a groove 3 extending in the circumferential direction. The fender is fixed to the rear axle housing 1 by fitting a U bolt there, but if the safety frame is attached to the rear axle housing 1 with the U bolt, it will be sufficient to withstand impact from the rear (in the direction of arrow A in Figure 1). It is difficult to ensure sufficient strength.

This invention makes it possible to more firmly fix the safety frame with a mounting bracket made of sheet metal, which is stronger than U-bolts, by using the groove 3 that conventionally used U-bolts, or by using a separately provided circumferential groove. Examples are shown in FIGS. 1 and 2.

The rear axle housing 1 is a member extending in the left and right vehicle width direction (perpendicular to the paper surface of FIG. 1) from a transmission case that also serves as a frame at the center of the tractor, and rear wheels are attached to both ends of the housing.

A frame-shaped safety frame 5 made of steel pipes or the like is arranged to surround the operator seated on the seat above the mission case, and the rear two of the four pillars at the front and rear corners of the frame are attached to the rear axle housing 1 as shown in Figure 1. For example, the front two are brackets (not shown) fixed to the transmission case.
Fixed.

The safety frame 5 of the rear strut portion is integrally provided with a flat mounting flange 6 made of thick steel plate at its lower end by welding, and the mounting 7 flange 6 rests on the flat upper surface 7 of the rear axle housing 1.

The mounting bracket 8 is a press-formed product made of a thick steel plate, and is integrally provided with a horizontal flange 9 at its upper open end, and its lower half is curved into a cylindrical shape, and has a generally U-shaped cross section as a whole.

An arc-shaped round bar 10 is fixed to the lower end of the inner surface of the mounting bracket 8 by welding, and this round bar 10 is fitted into the groove 3 over its entire length.

The mounting flange 6 and the 7 flange 9 of the mounting bracket 8 have three sets of bolts 11.
It is tightened with a nut 12, and at this time, the round bar 10 is in strong pressure contact with the bottom of the groove 3, the mounting flange 6 is in strong pressure contact with the upper surface T of the housing, and the front and rear width of the mounting bracket 8 (the left and right width in Fig. 1) is slightly reduced. It transforms as it does.

That is, a tightening allowance is provided in advance between the flanges 6°9, and the tightening allowance is mainly absorbed by the deformation of the mounting bracket 8, so that the safety frame 5 is firmly integrated with the rear axle housing 1.

In the illustrated embodiment, the round rods 10 are welded to the mounting bracket 8 at two places on the left and right as shown in FIG. 2, but the number of rods 10 can be determined as appropriate in relation to the required strength.

That is, there may be no problem even if there are three or more.

If the tractor falls backwards, an impact will be applied to the safety frame 5 in the direction of arrow A in Figure 1, and if it falls sideways, an impact will be applied to the safety frame 5 in the direction of arrow B in Figure 2. The mounting bracket 8 integrally connected to the rear axle housing 5 is provided with an arc-shaped round bar 10, and this round bar 10 engages with the groove 3 of the rear axle housing 1, thereby preventing movement of the safety frame 5 and dissipating the impact energy. This can be absorbed by deforming the safety frame 5.

Also, since the mounting bracket 8 is used, it can be aligned with the rear wheel fender (not shown).

As explained above, according to the present invention, the attachment portion of the safety frame 5 can be easily designed to withstand the impact when the vehicle falls.

Moreover, there is an advantage that the safety frame mounting portion can be reliably prevented from moving against impact when falling backward or sideways.

Furthermore, since the mounting flange 6 having a lower surface that matches the substantially horizontal and flat upper surface 7 of the rear axle housing 1 is mounted, not only can a large contact area be obtained, but also the safety frame 5 is stabilized during installation. This has the advantage of making the installation work easier.

Furthermore, since the flange 9 of the mounting bracket 8 is crimped and fixed to the mounting flange 6 with bolts 11, when a force is applied in the bolt shearing direction between both flanges 6.9, the flange 9 is crimped and fixed between both flanges 6.9. Since frictional force acts, it has the advantage of further increasing strength.

In addition, when embodying this invention, Ryaaxuruno Uzing 1
If the rear axle housing 1 has a polygonal shape as shown in FIG. It is also possible to provide a groove and form a groove therebetween.

The groove may be continuous on the lower half of the outer cylinder surface of the rear axle housing.

The mounting flange 6 does not need to be a flat plate, and may be a sheet metal piece shaped to fit the upper half of the rear axle housing 1.

However, when a flat plate is used as shown in FIG. 1, the work of joining it to the safety frame 5 becomes easier.

Depending on the shape of the groove 3, a bar material other than a round bar may be used instead of the round bar 10.

[Brief explanation of the drawing]

FIG. 1 is a vertical left side partial view, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1...Rear axle housing, 3...
・Groove, 6...Mounting flange, 8...Mounting bracket, 9...Flange, 10...
...Round bar (bar material), 11... Bolt.

Claims (1)

[Scope of utility model registration request] A groove 3 extending in the circumferential direction is provided on the outer surface of the rear axle housing 1 having a substantially horizontal and flat upper surface 7, and a mounting flange 6 having a lower surface matching the upper surface 7 is provided at the free end of the servant portion of the safety frame 5. 7. The flange 6 is placed on the upper surface 7 of the rear axle housing 1, and an arc-shaped bar 10 is fixed to the inner surface of a mounting bracket 8 having a U-shaped cross section and a horizontal flange 9 at the open end. The safety frame 5 is integrally attached to the rear axle housing 1 by fitting the mounting bracket 8 to the rear axle no. A safety frame mounting structure for a tractor, characterized in that it is fastened to the frame.