JPH0546237U - Walking lawn mower - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a walk-behind lawnmower in which rollers can be easily attached to an axle. [Structure] On the axle 5 protruding from the mission case 4,
The support boss 16 of the traveling roller 6 is removably fitted and the pin 18 is removably fitted to the pin insertion hole 19 of the axle 5 in a direction intersecting the rotational axis direction of the axle 5. Then, the exposed portion of the pin 18 fitted on the axle 5 can be engaged in the rotation axis direction, and the exposed portion of the pin 18 can abut in the circumferential direction around the rotation axis center. A notch 20 having a portion is formed on the support boss 16 and a connecting member 17 for connecting the roller body 15 of the traveling roller 6 and the support boss 16 is provided at the notch 20 at the position where the pin 18 is engaged. , The pin 1 in the direction intersecting the direction of the rotation axis
It is connected to the support boss 16 in a state in which the movement of 8 is restricted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a walking lawn mower.

[0002]

[Prior Art]

 In the past, in walk-behind lawnmowers, in order to make a lawn so that the lawn tilts in a certain direction after lawn mowing, it is known that the running wheel is composed of rollers that can press the lawn instead of the wheels. Has been.

[0003]

[Problems to be solved by the device]

 By the way, conventionally, the roller is attached to the axle by spline-fitting the axle protruding from the mission case and the support boss of the roller fitted onto the axle. For this reason, the length of the axle that forms the spline along the axial direction becomes long, and it becomes difficult to see the support boss of the roller in the roller body, which makes it difficult to align the axle and the support boss. There is a drawback that the fitting is easy and time-consuming. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a walk-behind lawnmower that can easily attach a roller to an axle.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the walking lawn mower according to the present invention is configured such that a support boss of a traveling roller is removably fitted on an axle protruding from a mission case and a pin of the axle is attached. Insertion: A pin is removably fitted in a direction intersecting the direction of the rotation axis of the axle, and the exposed part of the pin fitted on the axle can be engaged in the direction of the rotation axis. And a cutout having an inner edge portion with which the exposed portion of the pin can abut in the circumferential direction about the rotation axis, and the support boss is formed with a notch, and the roller body of the traveling roller is formed. A connecting member for connecting the support boss and the support boss in a state in which the movement of the pin in a direction intersecting with the rotation axis direction is restricted at the engagement position of the pin in the notch. It is characterized by being connected to the support boss. The actions and effects of this characteristic configuration are as follows.

[0005]

[Action]

 That is, a transmission pin is fitted to the end of the axle, and a notch for engaging the exposed portion of the pin is formed in the support boss, so that the engagement allows the exposed portion of the pin to rotate in the axle rotation direction. Since the contact is ensured, the length of the support boss fitted on the axle may be such that the support boss can be transmitted to the support boss in the axial direction of the axle. When mounting on the axle, all that is required is to insert the exposed part of the pin into the notch. Further, since the pin is prevented from coming off by the connecting member that connects the roller body of the traveling roller and the support boss, it is not necessary to prevent the pin from coming off with a beta pin or the like.

[0006]

[Effect of the device]

 Therefore, when the support boss of the traveling roller is externally fitted to the axle, the shaft phase can be easily aligned as compared with the conventional spline type, and the insertion length is short, so that the labor is reduced. Assembling work can be speeded up and simplified, and the number of parts can be reduced by eliminating the need for dedicated parts to prevent the pins from coming off.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 3 and 4 show a walk-behind lawnmower. This walking lawn mower has an engine 2 mounted on an upper part of a housing case 1, a cutting blade 3 is attached to a lower end of an output shaft of the engine 2 facing downward, and power from the engine 2 is transmitted. The mission case 4 is arranged in the rear part of the housing case 1, the axles 5 projecting left and right from the lower part of the mission case 4 are equipped with traveling rollers 6, 6, and the front part of the housing 1 is arranged on the left and right sides. A grass container 8 provided with front wheels 7 and 7 for collecting grass cut by the cutting blade 3 is arranged behind the mission case 4, and a steering handle 9 is extended rearward and upward from the housing case 1. It is put out and configured.

As shown in FIG. 1, power is input to the transmission case 4 by meshing a bevel gear 10 at the end of the transmission shaft from the engine 2 and a large-diameter bevel gear 12 boss-fitted to the intermediate shaft 11. In addition, the intermediate shaft 11 and the boss portion 12A of the large-diameter bevel gear 12 are provided with a ball detent type clutch mechanism 13 so that transmission and disconnection can be performed. 5, and a gear transmission mechanism 14 is provided between them. It should be noted that the large-diameter bevel gear 12 is dimensioned so that the position can be changed to the left and right with respect to the bevel gear 10 as shown by a phantom line in FIG. Are configured so that the same parts can be used.

The traveling rollers 6 and 6 are, as shown in FIGS. 1 to 4, a cylindrical roller body 15 having a ground roller surface, and a support arranged along the central axis of the roller body 15. The boss 16 and the boss 16 are connected by a wheel-shaped connecting member 17. On the other hand, a pin 18 for transmission is fitted in a pin insertion hole 19 formed in the middle portion of the axle 5 along a direction orthogonal to the axial direction of the axle. An exposed portion protruding from the shaft 5 is formed. The notch 20, 20 into which the exposed portion of the pin 18 is engaged along the axial direction is formed at one end of the support boss 16 of the traveling rollers 6, 6. Therefore, in order to interlock the traveling roller 6 with the axle 5, the exposed portion of the pin 18 is engaged with the notches 20 and 20 when the support boss 16 is slid on the axle 5 while being externally fitted. In the engaged state, as shown in FIGS. 1 and 2, the exposed portion of the pin 18 contacts the edge portion of the notch 20 in the circumferential direction about the shaft center. Therefore, due to this contact, the rotational power of the axle 5 is transmitted to the roller 6. Further, as shown in FIG. 1, the height of the exposed portion of the pin 18 is set lower than the thickness of the support boss 16, and the connection member 17 is connected to the support boss 16 by a connection member. The support boss 17a is such that the inner end of the boss 17a is fitted onto the support boss 16 and the inner end of the boss 17a is located on the engagement position of the pin 18 of the notch 20. The inner end 16 and the boss 17a are welded together. As a result, the exposed portion of the pin 18 engaged with the notch 20 is restricted by the inner end of the connecting member 17 to the boss portion 17a in the radial direction around the shaft center. Therefore, the pin 18 is prevented from coming off. On the other hand, a support shaft 22 bearing-supported by a support arm 21 attached to the housing case 1 is internally fitted and welded to one end of the support boss 16 which is not fitted to the axle 5.

In the above configuration, when the roller 6 is assembled to the axle 5, the pin 18 is previously inserted into the pin insertion hole 19 and frictionally held, and the notches 20 of the support boss 16 are provided on both exposed portions of the pin 18. , 20 are brought closer to the mission case 4 so that the rollers 6 are engaged. At this time, the exposed portion of the pin 18 and the notch 20 are aligned with each other while checking the contact between the exposed portion of the pin 18 and the end edge portion of the support boss 16 and engaged with each other.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a developed sectional view showing a mission case and rollers.

FIG. 2 is an exploded perspective view showing rollers, axles, and pins.

FIG. 3 is an overall bottom view showing a walking lawn mower.

FIG. 4 is an overall side view showing a walking lawn mower.

[Explanation of symbols]

 4 mission case 5 axle 6 running roller 16 support boss 17 connecting member 18 pin 19 pin insertion hole 20 notch

Claims (1)

[Scope of utility model registration request] 1. A support boss (16) for a traveling roller (6) is removably fitted onto an axle (5) protruding from a transmission case (4), and a pin insertion hole for the axle (5) is provided. The pin (18) is removably fitted in the (19) in a direction intersecting the direction of the rotation axis of the axle (5), and the pin (18) fitted in the axle (5) is A notch (20) provided with an inner edge portion into which the exposed portion can be engaged in the direction of the rotation axis, and the exposed portion of the pin (18) can abut in the circumferential direction around the rotation axis. ) To the support boss (1
6) and a connecting member (17) for connecting the roller body (15) of the running roller (6) and the support boss (16) to the pin () in the notch (20). A walk-type lawnmower connected to the support boss (16) in a state where the movement of the pin (18) in a direction intersecting with the rotation axis direction is restricted at the engagement position of 18). Machine.