JPH0350662Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a support structure for a drive shaft for a lawn mower, in which a cylindrical bearing boss that is externally fitted on the drive shaft for a lawn mower is attached and supported by a housing. Regarding.

[Conventional technology]

In such a support structure for a drive shaft for a cutting blade of a lawn mower, conventionally, the housing 100 and the cylindrical bearing boss 102 fitted onto the drive shaft 101 for the cutting blade are connected as shown in FIG. A cylindrical bearing boss 102 that is externally fitted onto the cutting blade drive shaft 101 is fitted from below into a hole 100A formed in the housing 100, and a reinforcing plate 104 is welded and fixed around this hole 100A. A connecting flange 103 externally fitted and fixed to the cutting blade 102 is connected and fixed to the reinforced portion with bolts 105 to increase the support strength of the cutting blade drive shaft 101. Alternatively, as shown in Japanese Patent Application Laid-Open No. 51-118654, a mounting ring as a flange fixed to the upper end side of a cylindrical bearing boss fitted externally to a drive shaft for a cutting blade is used for reinforcing the mounting ring, that is, for reinforcing the flange. The inverted cone-shaped support rings were connected to increase the support strength of the cutting blade drive shaft.

[Problem that the invention attempts to solve]

According to the former support structure, a separately formed reinforcing plate 104 is required, and according to the latter support structure, an inverted conical support ring for reinforcing the flange is required. This has the disadvantage of increasing the number of installation steps and increasing costs.

Furthermore, all of them have a structure in which the strength near the center of the housing, where the greatest load is applied, is reinforced by increasing the overall plate thickness or using a separate reinforcing plate, so the entire housing There was an inconvenience that the weight of the machine increased.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to modify the housing and connecting flanges that are originally provided, without increasing the number of parts. The object of the present invention is to enable the support strength of the cutting blade drive shaft to be increased without increasing the weight of the cutting blade.

[Means for solving problems]

The characteristic configuration of the present invention is that the support structure for a mowing blade drive shaft of a lawn mower includes a cylindrical bearing boss that supports the mower blade drive shaft and a housing that covers the upper side of the mower blade. ] to [c].

[B] The bearing boss and the housing are
They are connected and fixed via a connecting member provided across the outer peripheral surface of the bearing boss and the lower surface of the housing.

[B] The housing is formed with a hole that fits over the upper end of the bearing boss, and a concave annular rib whose groove bottom surface is downwardly pushed out around the hole.

[C] The connecting member is formed into a flared shape that expands upward, and its lower end is externally fitted and fixed near the lower end of the bearing boss, and its upper end is a concave groove annular rib formed in the housing. It is fixed at the bottom of the bottom.

[Effect]

The effects of having the above configuration are as follows.

In other words, the shape-retaining strength of the housing itself is increased by the grooved annular rib that is stamped downward into the housing, and the connection between the lug-shaped connecting member and the grooved annular rib forms an inverted triangular space when viewed from the side. By doing so, the stress applied to the housing is dispersed to the connecting member and the bearing boss.

[Effect of idea]

Therefore, from the above effects, it is possible to increase the support strength of the cutting blade drive shaft without increasing the number of parts by changing the shape of the housing and the connecting flange that are originally provided. There is an effect that can be done. In other words, the strength of the cutting blade housing itself is increased by the punched-out rib, and since the bottom of the rib does not protrude upward, but instead has the shape of a concave groove that is punched out downward, the bottom part of the rib is not protruded upward, but is shaped like a concave groove. It is also effective in shortening the axial length of the member, and therefore it is possible to create a lawn mower cutting blade drive shaft support structure with sufficient strength without increasing the weight of the housing or connecting member. As a result, we have been able to obtain advantageous results in many aspects.

〔Example〕

Fig. 3 shows a riding type lawn mower, which has an engine 2 and a fuel tank 3 in the bonnet 1 at the front of the machine body, and a control handle 4, a driver's seat 5, and horizontal flat parts at the rear. Na Detsuki 6
The front and rear wheels 8,
A housing 10 for storing cutting blades is provided at an intermediate position between the front and rear wheels 8 and 9 and extends rearward from the housing 10 to be located between the left and right rear wheels 9 and 9. It is configured to include a grass collection duct 11 and a grass collector 12.

Next, the structure inside the housing 10 will be described in detail.

As shown in FIGS. 1 and 2, a bolt is fixed in the casing 10 to the lower end of a downward mower blade drive shaft 13 that is driven and rotated around the vertical axis X by the output from the engine 2. A cutting blade 14 is stored therein. Then, a downward concave groove annular rib 15 is formed by stamping on the housing 10, and a pair of upper and lower bearings 16, 16 are formed on the drive shaft 13.
A lug-shaped connecting member 18 is externally fitted and fixed to the cylindrical bearing boss 17 which is externally fitted through the bearing boss 17, and an upwardly expanding lug-shaped connecting member 18 is externally fitted and fixed near the lower end of the bearing boss 17. Then, a hole 1 formed in the housing 10 near the upper end of the bearing boss 17
0A, and connect the opening side end of the connecting member 18 to the concave groove annular rib 15 in an overlapping state with a plurality of bolts 19 to form a triangular space in side view. The support strength of the cutting blade drive shaft 13 is increased.

20 in FIG. 2 are radial upwardly convex ribs for increasing the shape retention strength of the housing 10.

[Brief explanation of the drawing]

The drawings show an embodiment of the support structure for the mowing blade drive shaft of a lawn mower according to the present invention, FIG. 1 is a longitudinal cross-sectional side view showing the support structure for the mower blade drive shaft, and FIG. FIG. 3 is an overall side view of the riding lawn mower. FIG. 4 is a longitudinal sectional side view showing a conventional example of a support structure for a drive shaft for a cutting blade. 10... Housing, 10A... Hole, 13...
Drive shaft for cutting blade, 15... Concave groove annular rib, 17...
Bearing boss, 18...Connection member.

Claims (1)

[Claims for Utility Model Registration] A cylindrical bearing boss 17 that supports the cutting blade drive shaft 13 and a housing 10 that covers the upper side of the cutting blade 14.
A support structure for a drive shaft for a cutting blade of a lawn mower, which also includes the configurations described in [A] to [C] below. [B] The bearing boss 17 and the housing 1
0 is connected and fixed via a connecting member 18 provided across the outer peripheral surface of the bearing boss 17 and the lower surface of the housing 10. [B] The housing 10 has a bearing boss 17
A hole 10A that fits externally to the upper end side of the
A concave annular rib 15 is formed around the periphery, with the bottom surface of the groove projected downward. [C] The connecting member 18 is formed into an upwardly expanding tupular shape, and its lower end is externally fitted and fixed near the lower end of the bearing boss 17, and its upper end is formed into a groove formed in the housing 10. It is fixed to the lower side of the bottom surface of the annular rib 15.