JPH0369707A - Snow remover - Google Patents

Abstract

PURPOSE:To reduce a cost by a method wherein through intercoupling of claw couplings provided on the output and input shaft sides, a power is transmittable from the engine side to the snow removing mechanism side, and a bearing is held by means of the couplings on the input and output shaft sides. CONSTITUTION:A boss part 31 of a damper housing 30 is rotatably supported through a bearing 32 to the end part of an output shaft 21 rotated through running of an engine 3, and a claw coupling 35 is engaged with the boss part 31. An impeller boss part 46 is secured on an input shaft 45 through which a power from the engine 3 is inputted to a snow removing mechanism part A, and a claw coupling 44 is spline-engaged with the boss part 46. Recessed and protrusion parts formed on two couplings 35 and 44 are engaged with each other. An inner side 60a of a bearing 60 is held between the end pat of the joint 44 and a staged part 46a of the boss part 46 by means of a press force exerted from an axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a snow blower, and more particularly to a snow blower that transmits power generated by an engine to a snow removal mechanism via a joint.

[Prior Art] For example, a snow blower is equipped with an engine that drives crawler devices placed on the left and right sides of the vehicle body, and also drives a snow removal mechanism to move forward while blowing away scraped snow. Are known.

In such a snow blower, the snow removal mechanism that scrapes and blows away snow is driven by, for example, the rotation of an auger. Blow the snow you picked up? ! The impeller that blows the snow is directly connected by welding to the input shaft into which engine power is input, and the impeller rotates at high speed during snow removal operation.

As a connection method for connecting the output shaft from the engine and the input shaft to which the impeller of the snow removal mechanism is directly connected, there is a spline method as disclosed in, for example, Japanese Utility Model Application Publication No. 1024/1983. .

[Problem to be solved by the invention] By the way, when assembling a snow blower, with this spline method, the allowable amount of shaft misalignment is only the backlash of the spline. It was not easy to assemble. That is, the allowable amount of axial deviation of the spline is determined by the amount of backlash. On the other hand, backlash is determined by the size of the teeth.Especially in small snow blowers, increasing the shaft diameter unnecessarily is disadvantageous in terms of cost and weight, so it is necessary to reduce the shaft diameter. Therefore, the size of the teeth is small, and as a result, the tolerance for shaft misalignment is also small, so it is not easy to assemble the output shaft on the engine side and the input shaft of the snow removal mechanism, and accurate positioning is required. Special assembly required a jig. Additionally, this increases the number of assembly steps, resulting in higher costs.

On the other hand, since an impeller, for example, is welded to the input shaft of the snow removal mechanism, distortion may occur around the input shaft.

Structurally, this input shaft is inserted into a bearing and supported on the aircraft side, and the input shaft is positioned using this bearing.
Due to distortion around the input shaft, some gap had to be created between the input shaft and the bearing. This gap has caused problems such as a reduction in the life of the bearing and loosening of the bolts used to support the bearing.

This invention was made in view of the above circumstances, and it is easy to assemble the output shaft side of the engine and the input shaft side of the snow removal mechanism, and it also shortens the lifespan of the bearing that supports the input shaft side to the aircraft body. The purpose of the present invention is to provide a snow blower that does not cause problems such as a decrease in performance or loosening of bolts attached to the machine body.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the snow blower of the present invention has a meshing joint on the output shaft side that rotates due to the drive of the engine and the input shaft side that inputs power to the snow removal mechanism section. are provided respectively, and the connection of both meshing joints enables power to be transmitted from the engine side to the snow removal mechanism side, and furthermore, the meshing joint on the input shaft side and the input shaft side press down the bearing supported on the aircraft body side. It is characterized by what it has done.

[Function] In this invention, power is transmitted from the output shaft side to the input shaft side of the snow removal mechanism section through the meshing joint by the drive of the engine, and the snow removal mechanism section is thereby operated to blow away the scraped snow.

This meshing joint has teeth larger than splines, and since it is used in snow blowers with constant rotation,
Since the rotation is not instantaneously reversed, the backlash of this meshing joint can be made relatively large, and the tolerance for axis misalignment is large, so assembly is easy.

In addition, the input shaft side meshing joint and the input shaft side hold down the bearing from the axial direction, and this bearing supports the machine body, so the bearing can be held securely without any gaps between the bearing and the input shaft side or the machine body side. I can do it.

[Example] Next, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view of a snow blower to which the present invention is applied, FIG. 2 is a cross-sectional view showing the connection between the output shaft rotated by the engine and the input shaft of the snow removal mechanism, and FIG. FIG. 4 is a side view of the interlocking joint, FIG. 5 is a sectional view taken along the line V-V in FIG.
FIG.

Reference numeral 1 in the figure indicates a snow blower, an engine 3 is mounted in the center of the body 2, and crawler devices 4 are provided on both sides of the body 2. This crawler equipment Wt4 includes a sprocket 5a and a guide wheel 5b arranged in the front and rear.
and a truck 6, and is driven by the power of the engine 3, thereby causing the snow removal 4!11 to travel.

A snow removal mechanism section A is provided on the front side of the fuselage 2, an auger housing 8 is provided on the front side of an impeller housing 7 of this snow removal mechanism section A, and a discharge duct 9 is provided in the upper part under the impeller housing. The snow removed by 10 is blown away from the discharge duct 9 by the rotation of the impeller 11.

A pair of left and right handle pars 12 are attached to the rear side of the fuselage 2, and a grip 14 is attached to the rear end of the handle pars 12.
A handle is provided for the worker to hold while clearing snow and driving.

The engine 3 mounted on the aircraft body 2 has a crankshaft 16 arranged in a vertical direction, and transmits power from the crankshaft 16 to the crawler device 4 as well as to the snow removal mechanism section A. System B is constructed as shown in FIG.

That is, the transmission case 17 of the fuselage 2 is composed of a front case 18 and a rear case 19, and an impeller housing 7 is removably connected to the front end opening of the front case 18. 18 front end openings are closed. The upper surface of the rear case 19 is connected to the lower part of the engine 3, and the crankshaft 16 of the engine 3 is connected to the upper surface of the rear case 19.
are arranged in the vertical direction, and the lower end of the crankshaft 16 is introduced into the rear case 19. Transmission case 1
Power from the crankshaft 16 is transmitted to the drive shaft 20 of the sprocket 5a through a continuously variable transmission (not shown) in the drive shaft 7, and is also transmitted to an output shaft 21 extending orthogonally to the crankshaft 16 in the front-rear direction. .

The output shaft 21 is rotatably supported within the transmission case 17,
This output shaft 21 is provided with a clutch 22 that connects and disconnects power to the snow removal mechanism A side, and a clutch housing 23 of this clutch 22 is rotatably supported by the output shaft 21 via a bearing 24. A clutch boss 25 that rotates integrally with the output shaft 21 is arranged inside. Clutch plate 2 is attached to clutch boss 25.
6 is supported, and this clutch plate 26 and a friction plate 27 supported by the clutch housing 23 are alternately overlapped. A pressure plate 28 is disposed between the clutch housing 23 and the clutch boss 25, and the clutch spring 29 is lengthened to connect the pressure plate 28 to the friction plate 2.
7 to connect the clutch 22.

A boss portion 31 of a damper housing 30 is rotatably supported at the tip of the output shaft 21 adjacent to the clutch housing 23 via a bearing 32 . It is rotatably supported through.

A rubber damper 34 is housed within the damper housing 30, and the rubber damper 34 absorbs the impact when the clutch 22 is engaged. A mating joint 35 is spline-engaged with the boss portion 31 of the damper housing 30, and a bolt 3 is connected to the tip of the boss portion 31 via a washer 36.
7 is screwed on to prevent the engagement joint 35 from being removed. A drum 39 of a drum brake 38 is fixed to this meshing joint 35, and a brake shoe 40 is provided on the outside of the drum 39 so that one end of the brake shoe 40 can rotate around a bolt 41, and the other end is attached to a bolt 42. Spring 4 fixed to
3, the brake shoe 40 is always urged to be pressed to the outside of the drum 39, and when the clutch 22 is connected, the pressure on the brake shoe x-40 is automatically released via a link mechanism (not shown). It has become.

Opposing the meshing joint 35 provided on the boss portion 31 of the damper housing 30, the meshing joint 44 is spline-engaged with an impeller boss portion 46 fixed to the input shaft 45, and a washer 47 is provided at the tip of the impeller boss portion 46. A bolt 48 is screwed in through the bolt 48 to prevent the engagement joint 44 from being removed.

These meshing joints 35, 44 have three concave portions 35a, 44a and convex portions 35b, 44 at equal intervals on the circumference.
b are formed alternately, and the corresponding uneven portions are brought into contact with the joint surfaces perpendicular to the axial direction from the axial direction, so that they engage with each other.

In this way, in the meshing joint 35.44, the recesses 35a, 4
4a and the convex portions 35b, 44b are formed large, and since the snow blower 1 is used in a fixed direction rotation, the rotation is not momentarily reversed, so the backlash of the concave and convex portions can be relatively large. The allowable amount of deviation can be set large. Further, since the axial fitting depth of the uneven portion can be made shallower than that of the spline, the axial misalignment tolerance can be further increased accordingly. As a result, the engagement joint 35 of the output shaft 21 on the engine 3 side and the snow removal mechanism section Aff1l
The input shaft 45 and the engagement joint 44 of the input shaft 45 can be easily assembled, and there is no need to prepare a jig or the like for dedicated assembly for accurate positioning.

Note that the meshing joints 35 and 44 only need to have joint surfaces perpendicular to the axial direction, and the shape and number of the projections and depressions are not particularly limited.

Furthermore, an inner side 60a of the bearing 60 is located between the end of the meshing joint 44 fixed to the input shaft 45 side of the snow removal mechanism section A and the stepped portion 46a formed on the impeller boss section 46 fixed to the input shaft 45. The outer Bob of the bearing 60 is held between the impeller housing 7 and the bearing housing 49 by a pressing force from the axial direction. The bearing housing 49 is fastened to the impeller housing 7 with mounting bolts 50 and nuts 51. In this way, by holding the inner side 60a of the bearing 60 with the impeller boss portion 46 and the meshing joint 44, and holding the outer side with the bearing housing 49, the bearing 60 can be held securely.
Due to gaps, etc., the life of the bearing 60 may be shortened or the mounting bolt 5 may be damaged.
There will be no problems such as the zero becoming loose.

The impeller 11 is welded to the input shaft 45, and its tip is interlocked with the auger shaft 54 via a pair of worm gears 52 and 53 that penetrate the auger housing 8 and mesh with each other. The auger shaft 54 is provided with an auger 10, which rotates together to scrape off snow.

As described above, by holding the input shaft 45 of the snow removal mechanism section A with the bearing 60, the bearing 47 positions the input shaft 45 within the impeller housing 7, and thereby transmits power to the worm gears 52, 53, etc. The system is positioned, and the impeller 11 fixed to the input shaft 45 and the impeller housing 7 are positioned.

[Effects of the Invention] As explained above, the present invention connects the output shaft side that rotates due to the drive of the engine and the input shaft side that inputs power from the engine to the snow removal mechanism section with a meshing joint, and It enables power to be transmitted to the snow removal mechanism side, and the backlash of the meshing joint is greater than that of the spline joint.
Furthermore, since the snow blower is used for rotation in a fixed direction, there is no need to instantaneously reverse the rotation, so the tolerance for axis misalignment can be increased. Therefore, assembly is easy, and there is no need to prepare a dedicated assembly jig. Moreover, this eliminates the need for one step, which makes it possible to reduce costs.

In addition, the bearing is held down by the step between the input shaft side meshing joint and the input shaft side, and this bearing is supported by the aircraft side, making it possible to directly hold the bearing securely. It is possible to prevent problems such as loosening of the mounting bolts.

[Brief explanation of drawings]

FIG. 1 is a side view of a snow blower to which the present invention is applied, FIG. 2 is a cross-sectional view showing the connection between the output shaft rotated by the engine and the input shaft of the snow removal mechanism, and FIG. 4 is a side view of the interlocking joint, FIG. 5 is a sectional view taken along the line V-V in FIG. 4, and FIG.
1 is a sectional view. In the figure, 1 is a snow blower, 6 is an engine, 7 is an impeller, 1
0 is an auger, 16 is a crankshaft, 21 is an output shaft, 31 is a boss portion, 35.44 is a meshing joint, 45 is an input shaft, 46
is an impeller boss, 60 is a bearing, 49 is a bearing housing, A is a snow removal mechanism, and B is a power transmission system.

Claims (1)

[Claims] A meshing joint is provided on the output shaft that rotates when driven by the engine, and on the input shaft that inputs power to the snow removal mechanism, and by connecting both meshing joints, power can be transmitted from the engine to the snow removal mechanism. A snow blower further comprising: a bearing supported on the machine body by the input shaft side engagement joint and the input shaft side.