JPH0774494B2 - Small snow blower - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a self-propelled small snow remover equipped with a crawler type traveling body.

[Prior art]

As a small snow remover provided with crawler type traveling bodies on both left and right sides of a vehicle body, there is a conventional snow remover, for example, Japanese Patent Laid-Open No. 58-12837.
As can be seen from Fig. 1, there is known a power transmission path for transmitting the power of the engine to the traveling body, which is provided with a transmission formed by meshing a clutch and a plurality of gears in order from the engine side.

By the way, in this type of snow blower, a driver operates various operating levers provided on a steering wheel at a rear portion of a vehicle body to blow the snow scraped off by an auger away from a discharge tube to travel forward. However, even if the driver leaves the vehicle body during snow removal or traveling, if the traveling is continued as it is, it is not preferable from the viewpoint of safety.

Therefore, conventionally, a clutch is newly provided in the power transmission path, and a traveling lever that is interlocked with the clutch is provided in a handle gripped by the driver during snow removal work, so that the driver can operate the traveling lever during snow removal or traveling. When you let go of
A so-called deadman countermeasure is taken, in which the clutch is disengaged and power transmission to the traveling body is cut off.

[Means for solving problems]

However, according to this configuration, it is necessary to provide a clutch interlocking with the traveling lever in the transmission path of the engine power, in addition to the clutch for gear shift operation, and the number of parts increases correspondingly, which causes a problem of high cost. is there.

Moreover, the clutch used in the small snow remover brings the roller into contact with the belt stretched between the drive pulley and the driven pulley, and by this roller tensioning and loosening the belt, the power transmission is interrupted. Since it is a so-called tension clutch, in the conventional structure that requires two types of clutches, it is necessary to apply tension to one belt via two rollers. Therefore, the distance between the shafts between the pulleys must be lengthened, which is accompanied by the need for two rollers and its operating system, which causes a problem in that the size around the clutch becomes large.

Therefore, an object of the present invention is to obtain a small snow blower that can combine two conventionally required clutches into one, has a simple structure and is low in cost, and can be made compact around the clutch. .

[Means for solving problems]

In view of this, in the present invention, a power transmission path for transmitting the power of the engine to the traveling body is provided with a transmission formed by meshing a traveling clutch and a plurality of gears in order from the engine side, and the traveling clutch is constantly rotated by the engine. The belt stretched in a loose state between the driving pulley and the driven pulley connected to the input shaft of the transmission, and the belt is rolled around the outer circumference of the belt and is supported so as to be displaceable in the direction of contacting with and separating from the belt. And a spring that applies a tension to the belt by constantly pressing the roller in a direction of pressing the roller against the belt, and interlocks the shift lever of the transmission with the running clutch. , A small snow blower in which the roller is displaced toward and away from the belt to intermittently transmit power from the engine to the transmission As a premise, in addition to the shift lever, a travel lever gripped by the driver during traveling is provided, and the travel lever is interlocked with the travel clutch, and the travel lever is connected to the interlocking path between the travel clutch and the travel lever. When not operated, the roller is displaced in the direction away from the belt to hold the roller in a return position where tension is not applied to the belt, and an interlocking mechanism that releases the holding of the roller when the traveling lever is gripped is provided. It is characterized by that.

[Action]

According to this configuration, unless the traveling lever is gripped,
Since the roller is held in the return position where tension is not applied to the belt, the roller is forcibly returned to the return position when the driver releases the grip from the snow remover during snow removal or traveling. Returned to. Therefore, slippage occurs between the belt and the pulley, transmission of engine power to the traveling body is interrupted, and traveling of the snow remover is stopped.

Therefore, one clutch can be commonly operated by the traveling lever and the shift lever, and the two clutches that were conventionally required can be combined into one.

Moreover, since only one roller is required to apply tension to the belt, it is not necessary to increase the axial distance between the drive pulley and the driven pulley, and the traveling clutch can be made compact.

〔Example〕

The present invention will be described below based on an embodiment shown in the drawings.

In FIG. 8, reference numeral 1 is a vehicle body, and a front end portion of the vehicle body 1 is provided with an auger housing 2 that opens forward. An auger 3 is housed in the auger housing 2, and the auger 3 is rotationally driven by an engine 4 mounted on the vehicle body 1.

That is, as schematically shown in FIG. 7, the output shaft 5 of the engine 4 and the rotary shaft 6 connected to the auger 3 are connected to the V belt 7
Is interlocked by a power transmission mechanism 8 using the power transmission mechanism 8 and the auger 3 is rotationally driven by the power transmission from the power transmission mechanism 8. Then, the snow scraped by the rotation of the auger 3 is scraped to the central portion of the auger housing 2 and is blown outward through the discharge tube 10 by the rotation of the impeller 9 provided on the rotary shaft 6.

Reference numeral 11 in FIG. 7 indicates an auger clutch that connects and disconnects the power transmission to the auger 3 and the impeller 9 by tensioning or loosening the V belt 7.

Crawler-shaped traveling bodies 12 are provided on both left and right sides of the vehicle body 1. The traveling body 12 has a crawler 15 stretched between a front drive sprocket 13 and a rear driven sprocket 14, and the drive sprocket 13 of the traveling body 12 is driven from the engine 4 similarly to the auger 3 described above. It is driven by the power transmission of.

If this power transmission path is further explained, as shown in FIG. 6, a transmission 14 is interposed between the output shaft 5 of the engine 4 and the drive sprocket 13, and this transmission is
A V-belt 18 is stretched between a driven pulley 16 provided on the input shaft 15 of 14 and a drive pulley 17 provided on the output shaft 5 of the engine 4. The V-belt 18 is wound around the pulleys 16 and 17 loosely. Therefore, when the V-belt 18 is loosened, slippage occurs between the pulleys 16 and 17 and the power from the drive pulley 17 to the driven pulley 16 is reduced. Transmission is cut off.

Further, the transmission 14 is provided with an intermediate shaft 20 and an output shaft 21 that interlock with the input shaft 15. A plurality of speed change gears 22 are fixed to the outer periphery of the intermediate shaft 20, and another speed change gear 23 meshing with these speed change gears 22 is rotatably supported on the output shaft 21. The gear 23 is selectively connected to the output shaft 21 by a speed change lever 24 that slides in the axial direction of the output shaft 21.

Therefore, by the sliding of the speed change lever 24, the speed change gears 22, 23 for transmitting power from the intermediate shaft 20 to the output shaft 21.
Is selected, and the gear ratio is changed accordingly.

The output shaft 21 is interlocked with a clutch shaft 26 via a bevel gear 25, and the clutch shaft 26 includes the left and right clutches 27.
And, via the reduction gear 28, it is interlocked with the drive shaft 29 of the drive sprocket 13.

On the other hand, at the rear of the vehicle body 1, there is installed a steering wheel 30 which is gripped by the driver during snow removal and traveling, and between the left and right grip portions 31 of the steering wheel 30, as shown in FIG. 32 are provided. A shift lever 33 of the transmission 14 is supported on the operation panel 32 so as to be swingable in the front-back and left-right directions.
It penetrates through the guide groove 34 for displaying the shift pattern provided on the upper surface of the. As shown in FIG. 6, the guide groove 34 is provided with a plurality of vertical grooves 35 for specifying the reverse position and the positions from the first speed to the fourth speed, and a horizontal groove 36 for specifying the neutral position. Are tied together at one end.

Therefore, the gear shift operation is performed by moving the shift lever 33 from one vertical groove 35 into the horizontal groove 36 at one end and moving the horizontal groove 36 to the position of the desired vertical groove 35 in either the left or right direction. This is done by pushing it forward into the vertical groove 35, and a shift operation rod 37 connected to the shift lever 24 of the transmission 14 is connected to the shift lever 33. The shift operation rod 37 transmits the movement of the shift lever 33 to the shift lever 24 when the shift lever 33 is moved left and right along the horizontal shaft 36. By sliding in the axial direction of 21, the meshing of the transmission gears 22, 23 is switched as described above.

In addition to the shift lever 33, the operation panel 32 is provided with various levers such as a clutch lever 38 for operating the left and right clutches 26 and a throttle lever 39 of the engine 4, and a grip portion 31 of the handle 30. The vehicle is provided with a traveling lever 40 held by a driver during snow removal and traveling, and a clutch lever 41 for operating the auger clutch 11.

By the way, between the drive pulley 17 and the driven pulley 16 which form the transmission path of the engine power, the running belt which connects and disconnects the power transmission from the drive pulley 17 to the driven pulley 16 by tensioning or loosening the V belt 18 is provided. 45 are provided.
The traveling clutch 45 is, as shown in FIGS. 1 to 3, a roller 4 rollingly contacting the outer peripheral surface of the loose side 18a of the V-belt 18.
6, the roller 46 is pivotally supported on the upper end of a swing arm 47. The swing arm 47 is welded to a collar 49 which is axially supported on the outer periphery of a pivot 48, and the pivot 48 serves as a fulcrum for V.
The belt 18 is supported so as to be able to swing toward and away from the belt 18.

The pivot 48 is supported by a belt cover 50 that covers the periphery of the drive pulley 17 and the V belt 18 via a bracket 51.

The swing arm 47 is interlocked with the shift lever 33 and the traveling lever 40.
The interlocking structure of the 47, the shift lever 33, and the traveling lever 40 will be described.

That is, the fixing pin 52 projecting along the swing arm 47 is welded to the collar 49 which rotates integrally with the swing arm 47, and the fixing pin 52 is attached to the surface of the fixing pin 52 on the V belt 18 side. An engagement pin 53 that intersects with is abutted. Engagement pin 53
Is welded to a rotating shaft 54 extending from the belt cover 50 side, and rotates in a direction orthogonal to the fixing pin 52, and the rotating shaft 54 is connected to a first rod 56 via a lever 55. ing. The first rod 56 extends rearward of the vehicle body 1 and is connected to a second rod 58 extending upward via a link plate 57 rotatably supported in the rear portion of the vehicle body 1 in the vertical direction, The second rod 58 is connected to the shift lever 33. And the second rod
When the shift lever 33 is moved back and forth along the vertical groove 35, 58 moves up and down to transmit the movement of the shift lever 33 to the engagement pin 53 via the link plate 57 and the first rod 56. In the state where the shift lever 33 is held in the vertical groove 35, the engaging pin 53 is rotated toward the V-belt 18 side as shown by the imaginary line in FIGS. 3 and 4. There is.

Therefore, the shift lever 33 is moved in the lateral groove in accordance with the shift operation.
When moved into 36, the second rod 58 is pulled upward and the first rod 56 is moved backward, so that the engagement pin 53 is fixed to the fixed pin as shown by the solid line in FIGS. 3 and 4. 52 to V belt
Press in the direction away from 18. Therefore, the swing arm
47 is rotated in the direction away from the V-belt 18 (direction of arrow A), and holds the roller 46 at the return position where tension is not applied to the V-belt 18.

As shown in FIG. 2, another collar 60 is pivotally supported on the pivot shaft 48 adjacent to the collar 49 supporting the swing arm 47. The collar 60 is provided with a turning lever 61. It is welded. The rotating lever 61 has a substantially L-shape having a locking piece 62 extending upward along the swing arm 47 and an extending piece 63 extending from a lower end of the locking piece 62 in a direction away from the V-belt 18. None, the side edge of the locking piece 62 on the side opposite to the V-belt 18 is in contact with the stopper pin 64 protruding from the swing arm 47.

Between the extension piece 63 of the rotating lever 61 and the belt cover 50, a return spring 64 for urging the locking piece 62 in a direction of pressing the stopper pin 64 is stretched.

A torsion coil spring 65 is wound around the outer circumference of the collars 49, 60, and one end 65a of the spring 65 is
Is locked to the locking piece 62 of the rotating lever 61,
The other end 65b is locked to the lower end of the swing arm 47. Therefore, the swing arm 47 is urged by the torsion coil spring 65 so that the upper end thereof is rotated in the direction approaching the V-belt 18 (the direction of arrow B), whereby the roller 46 is pressed against the V-belt 18. , The fixing pin 52 is an engaging pin
Pressed by 53.

An operating wire 67 connected to the traveling lever 40 is connected to the extending piece 63 of the rotating lever 61 via a spring 66, and when the traveling lever 40 is gripped, the operating wire 67 is pulled.
The rotating lever 61 is rotated against the urging force of the return spring 63 and the torsion coil spring 65, and its locking piece
The 62 is designed to come off the stopper pin 64.

Therefore, in the case of the present embodiment, the rotating lever 61 and the stopper pin 64 cooperate with the traveling lever 40 to form an interlocking mechanism that restricts the swinging of the swinging arm 47.

In such a configuration, when the shift lever 33 is placed in the lateral groove 36, the second rod 58 is pulled upward to displace the first rod 56 rearward, so that the swing arm 47 is It is held at the return position separated from the V-belt 18.

Similarly, when the driver is not gripping the traveling lever 40, the rotating lever 61 is rotated in the direction away from the V belt 18 by the urging force of the return spring 64.
The locking piece 62 presses the stopper pin 64, so that the swing arm 47 is held at the return position.

Therefore, the roller 46 is merely rollingly contacting the V-belt 18 and does not apply tension to the V-belt 18, so that slippage occurs between the V-belt 18 and the drive pulley 17 and the driven pulley 16, and the clutch 45 is released. It is kept cut.

From this state, the travel lever 40 is gripped, and the turning lever 61 approaches the V belt 18 via the operation wire 67 (arrow B in the figure).
Direction), the locking piece 62 of the rotating lever 61 is disengaged from the stopper pin 64, and the swing lever 61 swings the swing lever 61.
47 is released.

Next, when the shift lever 33 is moved from the lateral groove 36 to the vertical groove 35 indicating the first speed, for example, the meshing of the transmission gears 22 and 23 of the transmission 14 is switched, and at the same time, the second rod 58, the link plate 57 and the The engaging pin 53 is rotated in the direction away from the fixed pin 52 through the first rod 56. Therefore, in combination with the fact that the rotating lever 61 is separated from the stopper pin 64, the swing arm 47 moves the torsion coil spring 65.
By the urging force of the V belt 18, the roller 46 is oscillated and displaced in a direction approaching the V belt 18, and the roller 46 is pressed against the outer circumference of the V belt 18,
Add tension to 18.

Therefore, the clutch 45 is engaged, and the power of the engine 4 is transmitted to the traveling body 12 via the transmission 14.

By the way, in such a traveling state, during snow removal or traveling, for example, when the driver releases his / her hand from the traveling lever 40, the pulling of the operation wire 67 is released. Due to the biasing force of the coil spring 65, the coil spring 65 is forcibly rotated in a direction away from the V-belt 18 (direction of arrow A in the figure). Then, the locking piece 62 of the rotating lever 61 abuts against the stopper pin 64 and presses the stopper pin 64, and thus the swing arm 47 is pushed back in the direction away from the V-belt 18, that is, toward the return position. As a result, the clutch 45 is disengaged.

Therefore, the power transmission from the engine 4 to the transmission 14 is cut off, and the traveling of the traveling body 12 is stopped.

According to such an embodiment of the present invention, a single clutch
Since 45 can be operated by both the traveling lever 40 and the shift lever 33, there is no need to provide two clutches in the power transmission path as in the conventional case, and the structure is simple and the number of parts is small accordingly. The cost can be reduced.

At the same time, since only one roller 46 is required to apply tension to the V-belt 18, it is not necessary to increase the axial distance between the drive pulley 17 and the driven pulley 16, and only one roller 46 is required. Together with this, it is possible to make the clutch 45 and its surroundings compact.

〔The invention's effect〕

According to the present invention described in detail above, there is no need to provide a special clutch operated by the traveling lever in the power transmission path, and accordingly, the structure is simple and the number of parts is small. Can be realized.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a side view partially cross-sectional view around the traveling clutch, Fig. 2 is a cross-sectional view taken along the line II-II in Fig. 1, and Fig. 3 is around the traveling clutch. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is a perspective view showing the interlocking relationship between the shift lever and the traveling lever, and the traveling clutch, and FIG. 6 is the plane of the guide groove. Fig. 7 and Fig. 7 are schematic views of the power transmission path, and Fig. 8 is a side view of the small snow blower. 4 ... Engine, 12 ... Traveling object, 14 ... Transmission, 16 ... Followed pulley, 17 ... Drive pulley, 18 ... Belt (V belt), 22, 23
… Gears, 33… Shift lever, 40… Travel lever, 45… Travel clutch, 46… Rollers, 61, 64… Interlocking mechanism (rotating lever, stopper pin), 65… Torsion coil spring.

Claims (1)

[Claims] 1. A power transmission path for transmitting power of an engine to a traveling body is provided with a transmission formed by meshing a traveling clutch and a plurality of gears in order from the engine side, and the traveling clutch is constantly driven to rotate by the engine. A belt stretched in a loose state between a drive pulley and a driven pulley connected to the input shaft of the transmission, and a belt that rolls around the outer circumference of the belt and is supported so as to be displaceable in a direction in which the belt comes in and out of contact with the belt. A roller and a spring that constantly presses the roller in a direction of pressing the belt to apply tension to the belt are provided. The traveling clutch is interlocked with the shift lever of the transmission, and the shift lever is operated to operate the shift lever. A small snow remover in which a roller is displaced in a direction in which the roller is separated from a belt so that power transmission from an engine to a transmission is intermittently performed. A travel lever that is gripped by the driver during traveling is provided separately from the lever, and the travel lever is interlocked with the travel clutch, and a roller is provided in the interlocking path between the travel clutch and the travel lever when the travel lever is not operated. Displacement in the direction of separating from the belt to hold the roller at the return position where tension is not applied to the belt, and an interlocking mechanism that releases the holding of the roller when the traveling lever is gripped A small snow blower.