JPS6018983Y2 - Propeller shaft cover support device for tractors, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cover support device for a propeller shaft for front wheel drive of agricultural tractors, civil engineering and construction tractors, and other four-wheel drive vehicles (hereinafter referred to as tractors, etc.).

In general, in four-wheel drive agricultural tractors, a part of the engine rotational power is extracted from the front drive case 2 attached to the bottom of the transmission case 1, as shown in Figure 1 (arrow F is in the front), and transmitted through the propeller shaft 3. The rotational force is supplied to the center box 4 at the center of the front axle.

In Fig. 1, an engine 6 is fastened to the front end (left end in the figure) of the transmission case 1 via a clutch housing 5 with a plurality of bolts, and a rear axle case 7 is similarly fastened to the rear side of the transmission case 1 at the center of the tractor. frame (this unit).

The cover 10 surrounding the propeller shaft 3 is divided into a front half 10a fixed to the center box 4 and a rear half 10b fixed to the front drive case 2. Both parts are fitted at the part 10c and fixed with a band as appropriate. However, as the overall length of the cover 10 becomes longer, it becomes necessary to hold the middle portion.

Conventionally, as a countermeasure against this problem, a cover 10 is used as shown in Fig. 2.
The inverted brackets 11 are welded to both the left and right sides of the clutch housing, and the upper ends are fastened to the posts 12 on the lower surface of the clutch housing with bolts 13, or the brackets 11 with slightly increased upward protrusion are attached to the front and rear as shown in Figure 3. It is fastened to the bottom surface 14 between the posts 12 and 12 with bolts 13.

However, when the bracket 11 is directly attached to the clutch housing 5 in this way, the mounting space for the safety frame mounting bracket is eliminated or limited, making it difficult to secure sufficient space for mounting the work equipment in the lower part of the clutch housing 5. Become.

The number of man-hours required for machining the clutch housing 5 also increases.

The present invention attempts to solve the above conventional problem by supporting the propeller shaft cover using a safety frame mounting bracket when a four-post two safety frame is installed on a tractor. Safety frame 16
The lower ends of the two rear struts 17 are fixed on the rear axle housing 18, and the lower ends of the two front struts 19 have a board 20 fixed to the bottom surface of the clutch housing 5. The safety frame mounting bracket 21 (cross member) The cover 10 is fastened with a plurality of bolts to the top surface of the left and right ends of the
The horizontal line of the inverted bracket 11 welded to both left and right sides of the bracket 21 is fastened to the lower surface of the bracket 21 by another bolt 24.

In FIG. 4, which is an enlarged view of the state in which the safety frame 16 in FIG. 1 is removed, the safety frame mounting bracket 21 is fastened to the lower end surfaces of the two bosses 12 and 12 on the lower surface of the clutch housing with two bolts 22 in the front and rear. left and right direction (
The left and right ends protrude left and right from the clutch housing 5 to attach the front strut 19 of the safety frame 16, and two screw holes are provided in the center. 23 (FIG. 5), a bolt 24 for fixing the bracket 11 is screwed from below.

Front and rear bosses 12.1 for attaching the bracket 21
2, there is a space A penetrating in the left-right direction, and within this space A, another work equipment support bracket 25 is installed.
(Cross member) is penetrated or supported, and a packet support arm (not shown) of a front loader, for example, is attached to a portion of the illustrated bracket 25 that protrudes left and right from the space A.

Spaces B and C before and after space A can be used to mount other work equipment.

As explained above, in the present invention, at least l pairs of bosses 12 are provided on the lower surface of the case and extend in the left and right directions, and the front and rear edges of the safety frame mounting brackets 21, which extend in the left and right directions on the lower surface of both hosts 12, are secured with bolts 22. Space A for inserting the work equipment support bracket 25 between both bosses 12.
The top horizontal piece of the inverted bracket 11 welded to both sides of the cover 10 of the front wheel drive propeller shaft 3 is attached to the bottom surface of the safety frame mounting bracket 21 using another bolt 2.
4, the following special effects can be obtained.

That is, the safety frame mounting bracket 21 can be formed as one cross member extending in the left-right direction,
The front and rear edges of this safety frame mounting bracket 21 are fastened with bolts 22 to the lower surfaces of a pair of bosses 12.12 spaced apart in the front and back, so that they accurately protrude into predetermined positions in both left and right directions of the clutch housing 5, and The holding rigidity for the four-column second safety frame 16 and the like is kept large and evenly on the left and right sides, thereby making it possible to firmly support the safety frame 16 in a predetermined posture.

As in the illustrated embodiment, the front and rear edges of the safety frame mounting bracket 21 are each tightened by at least two bolts 22, so that the rigidity against torsional loads is increased, and therefore the safety frame front column 19 is able to withstand impact in the front and back direction. It has the advantage of being able to sufficiently withstand even when subjected to damage, and ensuring sufficient torsional rigidity even if it is a relatively thin plate-like member.

Further, since it is only necessary to provide a screw hole in the boss 12 for screwing the bolt 22, the amount of machining required for the large-sized clutch housing 5 can be minimized.

Further, according to the present invention, by simply providing two screw holes 23 for cover attachment in the center of the safety frame attachment bracket 21, the optimum intermediate portion of the propeller shaft cover 10 can be fixed to the bracket 21 by the bracket 11. , the cover 10 can be fastened to the bracket 21 without interfering with the bolts 22 for fixing the bracket 21;
Furthermore, machining of the clutch housing 5 can be simplified.

In addition, when attaching the work equipment to a tractor, it is necessary to firmly connect the left and right side members of the tractor with a cross member that passes under the abdomen of the tractor to maintain strength. Space A surrounded by bracket 21
can be used for the above purpose, and when the bracket 25 is passed through the space A, the bracket 25 is held by the boss 12 and the bracket 21 from the front and back and from the bottom, and the predetermined position is determined. 2
The load received by 5 can be supported by boss 12 and bracket 21, increasing the holding strength of the working machine and accurately determining its position.

A work machine is connected to the left and right ends of the bracket 25 passed through the space A, and the space between the safety frame front column 19 and the clutch housing 5 is used to easily and firmly connect a work machine such as a front loader. Can be installed.

Since the front column 19 of the four-post second safety frame 16 is located exactly in the middle between the front drive case 2 and the center box 4, if the cover 10 is supported using the center of the lower surface of the safety frame mounting bracket 21, the cover 10 will be The optimal position approximately in the middle can be held, and the effect of holding the cover is enhanced.

That is, the safety frame mounting bracket 21 provides an optimal position for holding the middle portion of the cover 10.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway left side schematic diagram of an agricultural tractor to which the present invention is applied, Figs. 2 and 3 are drawings showing a conventional structure corresponding to a part of Fig. 1, and Fig. 4 is based on Fig. 1. Partially enlarged view showing the state with the safety frame removed, Figure 5 is ■-■ of Figure 4
FIG. 3... Propeller shaft for front wheel drive, 5...
...Clutch housing (case), 10...
・Cover 21...Safety frame mounting bracket.

Claims (1)

[Scope of utility model registration request] At least one pair of posts 12 are provided on the bottom surface of the case, and the front and rear edges of the safety frame mounting bracket 21, which extends in the left and right directions, are attached to the bottom surface of both bosses 12 using bolts 22.
to form a space A between both bosses 12 for insertion of the work equipment support bracket 25, and welded to both left and right sides of the cover 10 of the front drive propeller shaft 3 on the bottom surface of the safety frame mounting bracket 21. A propeller shaft cover support device for a tractor or the like, characterized in that the upper end horizontal piece of the bracket 11 is fastened with another bolt 24.