JPH10298939A - Power transmission mechanism of snow plow - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a snow plow part from being damaged by operating a torque limiter to cut off the transmission of power when overload is applied to simplify the power transmission constitution at the subsequent stage of the torque limiter by providing one torque limiter so as to facilitate maintenance, put no limitation on the fitting position, and enable compact arrangement, and to eliminate the need of replacing a shear bolt or the like by meshing clutch claws by energizing force so as to facilitate handling. SOLUTION: A power transmitting mechanism of a snow plow transmits the power from an engine from an output pulley 21 of the engine to an input pulley 25 of a snow plow part to drive a blower 29 and a rake-in auguer. In that case, at the subsequent stage of the input pulley 25, an overload preventing mechanism 33 is provided between the input pulley at the preceding stage of the blower 29 and the rake-in auger and an input shaft, and the overload preventing mechanism 33 is formed as a torque limiter by claw clutches 34a, 37a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for transmitting power from an engine to an auger and a blower of a snow removing unit disposed in front of the machine and cutting off the transmission of power when the snow removing unit is overloaded.

[0002]

2. Description of the Related Art Conventionally, power from an engine is transmitted to an auger and a blower of a snow removing section arranged in front of the machine, and transmission of power is cut off when an overload is applied to the snow removing section. The overload was transmitted to the engine to prevent engine stall and damage to the snow removal part. For example, as shown in FIG.
1, there are a traveling output pulley 23a and a snow removal output pulley 23b.
To remove the power from the engine E to remove the snow output pulley 23b.
The blower is transmitted to the snow removal input pulley 25 on the blower shaft 27 via the belt 22, a blower 29 is disposed at a halfway point on the blower shaft 27, and the tip of the blower shaft 27 is swaged through a gear box 30. In order to transmit power to the blower (input) shaft 27 and the blower 29 and the auger auger 26, a shear is provided between the blower (input) shaft 27 and the blower auger 26 so that the power transmission mechanism is not damaged when an overload is applied. The bolts 31 and 32 were arranged.

[0003]

However, in the snow blower described above, the shear bolts 31 and 32 are
, The power is transmitted to the blower 29 and the auger auger 26 through the shaft. If the blower 29 or the auger auger 26 is overloaded, the shear bolt 31 or 32 is broken, and the overload on the blower shaft 27 is overloaded. It was configured so that it did not start, but if the shear bolt broke,
In order to resume work after eliminating the cause of overload, it is necessary to replace the shear bolt, and this replacement of the shear bolt is very troublesome, and it takes a long time to resume the work. It was.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in the configuration in which the power from the engine is transmitted from the output pulley of the engine to the input pulley of the snow removing section, and the blower and the scraping auger are driven from the input pulley, the torque is provided downstream of the input pulley and upstream of the blower and the scraping auger. A limiter is provided.

The torque limiter is provided between an input pulley and an input shaft, and the torque limiter is slid on an input shaft, a clutch claw provided on the input pulley, a clutch claw meshing with the clutch claw. A freely provided slider is constituted by a spring biased in a direction in which the clutch pawl meshes.

[0006]

Next, an embodiment of the present invention will be described. FIG. 1 is an overall side view of the snow removing machine, FIG. 2 is a side sectional view of a power input section of the snow removing section, and FIG. 3 is a plan view showing a conventional power transmitting mechanism of the snow removing section.

First, the overall configuration of the snow blower will be described with reference to FIG. The machine A is covered with the machine cover 1, the engine E is built in the machine cover 1, the bonnet 2 is arranged at the upper part, and the exhaust muffler 3 projects from the front of the hood 2. . A battery B is installed behind the engine E. A snow removing section D is continuously provided at the front of the machine A. The snow removing section D is provided with an auger housing 8 for covering a scraping auger 26 for scraping snow at the foremost portion, and a rear section of the auger housing 8 at a rear portion. A blower cover 6 in which a blower is provided is continuously provided, and a snow throwing chute 7 protrudes above an upper portion of the blower cover 6. A snow removal height adjustment plate 10 is provided at the lower end of the blower cover 6.

The base of the snow chute 7 is a blower cover 6.
The operation unit C disposed at the rear of the machine A can be rotated by driving a motor by a manual operation using a handle or a switch operation. A chute cap 7a is provided at the upper end of the snow throwing chute 7 to adjust the snow throwing angle by turning up and down, so that the operation section C can adjust the angular path. The operation panel C includes an operation panel 5
And handle 4 are arranged. An accelerator lever, a traveling speed change lever, a snow removal height adjustment switch, and the like are provided on the operation panel 5, and a snow throw chute turning lever, a chute cap turning lever, and the like are arranged. A snow removal clutch lever is arranged on one side of the handle 4, and a traveling clutch lever is arranged on the other side. Reference numeral 36 denotes a deadman switch, which is turned on when the operator releases his hand from the traveling clutch lever to stop the engine.

An HST type transmission H and a transmission case T are disposed below the engine E. Final cases 19 and 19 are provided on both left and right sides of the transmission case T.
The drive sprocket shafts 11 protrude laterally from the final case 19, and the drive sprockets 13 are fixed on the drive sprocket shafts 11.

The drive sprocket shafts 11 are supported at the front of a crawler frame 12, and idlers 15 are rotatably supported at the rear of the crawler frame 12. The drive sprocket 13 and the idler 15 To form a crawler-type traveling device.

An output pulley 23 is fixed to an output shaft 21 protruding forward from an engine E provided in the cover 1 of the machine, and the output pulley 23 is formed as a double pulley.
The rear portion is a traveling output pulley 23a, and the front portion is a snow removal output pulley 23b. H disposed below the engine E
An HST input pulley 24 is provided on the input shaft of the ST-type transmission H.
Is fixed, and a belt is wound between the HST input pulley 24 and the traveling output pulley 23a to transmit driving force to the HST type transmission H via the HST input pulley 24. The driving force transmitted to the HST transmission H is transmitted from an output shaft projecting rearward of the HST transmission H to a transmission case T disposed rearward, and drives the drive sprocket 13 via the final case 19. It is driving.

An input shaft (blower shaft) 27 of a snow removing section is rotatably supported in the front-rear direction at the left and right central portions of the blower cover 6 and the auger housing 8, and the rear end of the blower shaft 27 is auger housing. A snow removal input pulley 25 is disposed on the shaft end so as to protrude rearward from 8, and is connected to the blower shaft 27 via an overload prevention mechanism 33 of the present invention. A belt is wound between the snow removal input pulley 25 and the snow removal output pulley 23b so that the power from the engine E can be transmitted to the snow removal unit D. A blower 29 is fixedly mounted on a middle part of the blower shaft 27, the snow throwing chute 7 is disposed above the blower 29, a front end of the blower shaft 27 is inserted into a gear box 30, and a bevel gear in the gear box 30 is provided. The power is transmitted to the drive shaft 26a of the scraping auger 26 via the.

The overload prevention mechanism 33 of the present invention is constituted by a torque limiter. As shown in FIG. 2, the snow removal input pulley 25 is fixed to a boss 34, and the boss 34 is
5, and is rotatably supported on a blower shaft 27. However, the snow removal input pulley 25 and the boss 34 may be integrally formed. A clutch claw 34a is formed on the front end surface of the boss 34. On the other hand, a slider 37 is spline-fitted on the blower shaft 27 and is slidably fitted in the front-rear (axial) direction. A clutch claw 37a is formed on the rear end face so as to face the clutch claw 34a. The slider 37 is urged rearward as a resilient member by a spring 39 externally fitted on the blower shaft 27, so that the clutch pawls 34a and the clutch pawls 37a are always meshed to form a pawl clutch.

The overload prevention mechanism 33 (claw clutch) is covered by a pipe-shaped shaft case 40, and a seal 41 is interposed between the shaft case 40 and the snow removal input pulley 25.
A bearing 38 with a seal is interposed between the inside of the front portion of the shaft case 40 and the blower shaft 27 to prevent dust and the like from entering. The front end of the spring 39 is received by a bearing 38. The front end of the shaft case 40 is fixed to the blower cover 6.

As described above, the overload prevention mechanism 33 is located downstream of the snow removal input pulley 25 in the power transmission path, and
It is arranged at a stage preceding the scraper auger 26, and more specifically, is interposed between the input pulley 25 and the blower shaft 27. During snow removal work, the blower 29 or the scraper auger 26 is overloaded, and the spring 39 Clutch claw 34a by urging force
When the load exceeds the engagement force between the clutch pawl 37a and the clutch pawl 37a, the engagement between the clutch pawl 34a and the clutch pawl 37a is released as shown in the upper part of FIG.
5 is idle. As described above, even if one of the blower 29 and the scraping auger 26 is overloaded, the overload prevention mechanism 33 operates to cut off the transmission of power, and both the blower 29 and the scraping auger 26 rotate. Power is not transmitted, and damage to the snow removing section D is prevented beforehand. Then, when the load is removed, the clutch pawls 34a and the clutch pawls 37a engage with each other by the urging force of the spring 39 to transmit the power.

[0016]

As described above, the present invention has the following advantages. That is, in the configuration for transmitting the power from the engine to the snow removing section as described in claim 1, the torque limiter is provided downstream of the input pulley and upstream of the blower and the scraping auger, so that either the blower or the scraping auger is provided. When an overload is applied to one side, the torque limiter operates to cut off the transmission of power, preventing damage to the snow removal section, and only one torque limiter is required. The power transmission configuration can be simplified.

Further, since the torque limiter is provided between the input pulley and the input shaft, maintenance can be facilitated, the mounting position is not limited, and the device can be compactly arranged. Further, a clutch claw is provided on the input pulley, and a clutch claw that meshes with the clutch claw is formed as a slider slidably provided on the input shaft, and the slider is moved in a direction in which the clutch claw meshes. If the force is greater than the force, the clutch claw will be disengaged and cut off the transmission of power.If the load is removed, the force will cause the clutch claw to engage, and it will be necessary to replace the shear bolt etc. It was easier to handle.

[Brief description of the drawings]

FIG. 1 is an overall side view of a snow blower.

FIG. 2 is a side sectional view of a power input unit of the snow removing unit.

FIG. 3 is a plan view showing a conventional power transmission mechanism of a snow removing section.

[Explanation of symbols]

 D Snow removing section E Engine 21 Output shaft 25 Input pulley 26 Scraping auger 27 Blower shaft 29 Blower 33 Overload prevention mechanism 34a / 37a Clutch claw 37 Slider 39 Spring

Claims (3)

[Claims] 1. A configuration in which power from an engine is transmitted from an output pulley of an engine to an input pulley of a snow removing unit, and a blower and a scraping auger are driven from the input pulley. A power transmission mechanism for a snowplow, wherein an overload prevention mechanism is provided at a preceding stage. 2. The power transmission mechanism for a snowplow according to claim 1, wherein said overload prevention mechanism is a torque limiter and is provided between an input pulley and an input shaft. 3. A clutch pawl is provided on the input pulley,
2. The clutch according to claim 1, wherein a clutch pawl meshing with the clutch pawl is formed on a slider slidably provided on an input shaft, and the slider is urged by an elastic member in a direction in which the clutch pawl meshes. Power transmission mechanism for snowplow.