JP2006194327A - Transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission device with a friction plate enabling easy replacing work in a very shorter time by removing a bearing member to open a removal hole when removing the friction plate, so that the friction plate is removed from the removal hole as a shift frame remains mounted without pulling an output shaft supporting the friction plate off the shift frame. <P>SOLUTION: The transmission device comprises the box-shaped shift frame 6, a friction disc gearbox stored therein, and the output shaft 37 on which the friction plate 35 of the friction disc gearbox is mounted and which is pivoted at both sides to side plates 6R of the shift frame 6. The removal hole 6b is opened in the side plate supporting the output shaft 37 at one side for allowing the friction plate 35 to pass therethrough. The removal hole 6b can be closed with the bearing member 62. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure for allowing a friction plate of a friction disk transmission to be easily replaced from a transmission frame.

2. Description of the Related Art Conventionally, a technique using a friction disk transmission is known in a traveling mission. (For example, refer to Patent Document 1 and Patent Document 2).
In this technique, power from the engine is transmitted to the center of a disc-shaped transmission plate via a belt, a pulley, or the like, and the disc-shaped transmission plate is rotated. On the other hand, a disc-shaped friction plate is arranged in a direction perpendicular to the transmission plate, an output shaft is arranged at the center of the friction plate, and an output shaft is perpendicular to the input shaft arranged at the center of the transmission plate. Arrange them to be in the direction. The outer periphery of the friction plate is brought into frictional contact with the plate surface of the transmission plate, and the rotation of the transmission plate is transmitted to the friction plate to transmit power. Then, by changing the contact position of the friction plate in the diametrical direction from the center of the transmission plate with respect to the transmission plate, it is possible to continuously change the speed from forward to reverse.

Since the friction plate is arranged so as to be slidable to the left and right with respect to the output shaft and to be supported so as not to rotate relative to the output shaft, a polygonal shaft, a spline shaft, or the like is used as the output shaft. The transmission plate and the friction plate are housed in a box shape, and both sides of the output shaft are rotatably supported by the side plates of the transmission frame.
Japanese Utility Model Publication No. 63-128357 JP-A-10-68108

In the case of the friction disk type transmission as described above, the contact portion of the friction plate is composed of a member with a large coefficient of friction such as a rubber plate, and since it is in contact during running, it is worn out and replaced regularly. There is a need to. However, since the friction plate is arranged on the output shaft arranged in the horizontal direction and arranged at the approximate center of the transmission frame, it is necessary to remove the output shaft from the transmission frame when replacing it. It was over.
In particular, when a friction disk type transmission is adopted as the transmission of the snowplow, the engine is mounted on the transmission frame of the transmission, a snow removal unit is provided at the front, and crawler type traveling devices are arranged on both the left and right sides. After all of these were removed, the output shaft was pulled out to the side to replace the friction plate. Therefore, it takes a lot of work to disassemble, and the work may take about half a day, and the work has been required to be shortened.
Therefore, the present invention is configured so that the friction plate can be easily removed without removing the snow removal portion, the crawler, or the like and without removing the output shaft.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, the friction disk type transmission is housed in the box-type transmission frame, and both sides of the output shaft to which the friction plate of the friction disk type transmission is attached are supported on the side plate of the transmission frame. Then, an extraction hole having a size that allows the friction plate to pass through a side plate that supports one side of the output shaft is opened, and the extraction hole is closed by a bearing member.

As effects of the present invention, the following effects can be obtained.
According to the first aspect of the present invention, when the friction plate is removed in order to wear or maintain the friction plate, the take-out hole is opened by supporting the friction plate by removing the bearing member. The friction plate can be removed from the extraction hole while the output shaft is attached to the transmission frame without being pulled out of the transmission frame. Therefore, it is not necessary to disassemble the crawler and the snow removal portion, the friction plate replacement work is simplified, and the time required for the replacement work can be greatly shortened.

Next, embodiments of the invention will be described.
1 is an overall side view of a snowplow equipped with a friction disk transmission, FIG. 2 is a left side view of the friction disk transmission, FIG. 3 is a plan view, FIG. 4 is an exploded perspective view, and FIG. Fig. 6 is a right side view of the frame, Fig. 6 is a perspective view of the body frame and the crawler type traveling device with the bearing member removed, and Fig. 7 is a cross-sectional view of the transmission unit.

First, the overall configuration of the snowplow 1 will be described with reference to FIG.
The snowplow 1 includes a snow removal unit 2 disposed at the front of the machine body, a drive unit 3 disposed behind the snow removal unit 2, and a crawler traveling device 4 disposed below the drive unit 3. And a driving operation unit 5 disposed behind the driving unit 3 and at the rear of the machine body.

  The snow removing portion 2 includes a blower 8 provided in a blower housing 7 connected to a front portion of a body frame (transmission frame) 6, and an auger housing 9 provided in front of the blower housing 7. A take-up auger 10 provided so that the rotation axis is in the left-right direction, and a snow throwing shooter 11 erected on the blower housing 7 so as to be horizontally rotatable are provided.

  A handle 12 extending rearward to the vicinity of the driving operation unit 5 is attached to the rear surface of the middle part of the snow throwing shooter 11, and the snow throwing shooter 11 is turned by turning the handle 12 in the left-right direction. It is possible to change the snow throwing direction. Furthermore, a cap 11a is provided at the upper end of the snow throwing shooter 11, and the cap 11a and the handle 12 are connected via a link or the like so that the cap can be turned up and down by operating the handle 12, thereby increasing the snow throwing distance. It is adjustable.

  In the snow removal section 2 configured in this manner, the snow that has been scraped by the scraping auger 10 in the substantially central direction of the auger housing 9 is sent to the blower 8 and is splashed upward by the centrifugal force of the blower blades. Guided by the snow throwing shooter 11, the snow throwing direction is arbitrarily changed and discharged.

  In the drive unit 3, a friction disk type transmission, which will be described later, is installed in the body frame 6, and an engine 15 is mounted on the top of the body frame 6. The power of the engine 15 is output from the output shaft 15 a and transmitted to the snow removal unit 2 and the traveling device 4. The power transmitted to the snow removal unit 2 rotationally drives the blower 8 and the take-up auger 10. Further, the power transmitted to the traveling device 4 is shifted by the transmission and then transmitted to the drive shaft 16 to rotationally drive the drive sprockets 17 and 17 fitted to the drive shaft 16.

  A drive shaft 16 fitted with drive sprockets 17 and 17 is rotatably supported at the lower part of the machine frame 6, and driven sprockets 18 and 18 are fitted at the rear of the machine frame 6. The rear axle 19 is horizontally supported so as to be rotatable. An endless crawler belt 20 is wound around the drive sprocket 17 and the driven sprocket 18 to form a crawler, and the crawler type traveling device 4 that is driven to run by the rotational drive of the drive shaft 16 is constituted by the pair of left and right crawlers. Has been.

  In the driving operation unit 5, a steering handle 21 protrudes obliquely rearward and upward from the rear portions on both sides of the body frame 6, and an operation box 23 is disposed between the steering handles 21 configured in a U shape in plan view. . The operation box 23 is provided with a travel shift lever 26 for performing a shift operation by the transmission. On both sides of the steering handle 21, a traveling clutch lever 24 for connecting / disconnecting power from the engine 15 to the traveling portion and a snow removal clutch lever 25 for performing on / off operation of transmission from the engine 15 to the snow removing portion 2 are disposed. Has been.

  The travel clutch lever 24 is configured to be able to grasp the lever 24 while grasping the steering handle 21. The lever 24 is a deadman clutch lever that operates when the lever 24 is grasped together with the steering handle 21 and stops when released. ing. The travel clutch lever 24 and the snow removal clutch lever 25 are both provided in the vicinity of the steering handle 21, and both the travel clutch lever 24 and the snow removal clutch lever 25 are urged to the clutch OFF operation position, When the snow removal clutch lever 25 is turned on while the lever 24 is turned on, the snow removal clutch lever 25 can be locked by being turned on at the operation position of the travel clutch ON.

Next, a power transmission mechanism from the engine 15 will be described with reference to FIGS.
2 and 3, a drive pulley 27 is fixed to the output shaft 15a of the engine 15. The drive pulley 27 includes a travel drive pulley 27a and a snow removal drive pulley 27b, and a snow removal drive pulley 27b disposed on the front side. Then, it is transmitted to a transmission shaft for driving the blower 8 and the take-up auger 10 of the snow removal unit 2 through a belt, a pulley, and the like. The upper and front portions of the drive pulley 27 are covered with a cover. A tension pulley is disposed between the snow removal drive pulley 27b and a pulley on the transmission shaft, and a tension arm that supports the tension pulley is connected to the snow removal clutch lever 25 via a wire or the like to connect / disconnect power. It is possible.

  Further, power is transmitted from the travel drive pulley 27 a to the travel driven pulley 31 via the belt 30, and the travel driven pulley 31 is fixed to the front end of the input shaft 32. A tension pulley (not shown) is disposed between the travel drive pulley 27a and the travel driven pulley 31, and a tension arm that supports the tension pulley is connected to the travel clutch lever 24 via a wire. The power can be connected and disconnected by operation.

As shown in FIG. 7, the input shaft 32 is penetrated in the front-rear direction by a bearing 33, and a midway portion in the front-rear direction is rotatably supported via the bearing. A traveling driven pulley 31 is fixed to the front end of the input shaft 32. The center of a transmission plate 34 having a disc shape is fixed at the rear end. A slip member 44 is inserted into the rear surface of the center portion of the transmission plate 34. The slip member 44 is formed in a cylindrical shape and is formed of a low friction member. The rear surface of the slip member 44 is disposed so as to be flush with the rear surface of the transmission plate 34 and is disposed so as to be in contact with a friction plate 35 described later.
With this configuration, when the friction plate 35 is located at the center of the transmission plate 34, the friction plate 35 comes into contact with the slip member 44 and slips and idles, and power is transmitted from the transmission plate 34 to the friction plate 35. Can be kept neutral without being transmitted. When the friction plate 35 slides slightly outward in the radial direction from the center of the transmission plate 34, the rotation of the transmission plate 34 can be transmitted to the friction plate 35 by the frictional contact between the transmission plate 34 and the friction plate 35. It becomes.

  An output shaft 37 formed of a spline shaft or a polygon shaft is supported on the body frame 6 behind the speed change plate 34. On the output shaft 37, a disc-shaped friction plate 35 is spline-fitted so as to be slidable in the axial direction of the output shaft 37. That is, the friction plate 35 is slidable on the output shaft 37 in the left-right direction and is fitted so as not to be relatively rotatable. On the left and right sides of the center of the friction plate 35, a boss portion 35a is fixed by a bolt or the like, and a connecting ring 36 is rotatably mounted on the boss portion 35a via a bearing. One end of a transmission arm 43, which will be described later, is fitted to the connection ring 36, and is linked to the traveling transmission lever 26 via a rod or the like. A friction member made of rubber or the like is affixed to the outer periphery of the friction plate 35, and the rotation of the transmission plate 34 is transmitted to the friction plate 35 by pressing the outer peripheral portion against the surface of the transmission plate 34. The power is transmitted to the output shaft 37.

  In addition, as shown in FIG. 2, the countershaft 40 and the drive shaft 16 are horizontally mounted in the left-right direction parallel to the output shaft 37 on the body frame 6, and the countershaft 40 is pivotally supported at a front position of the output shaft 37, A drive shaft 16 is pivotally supported below the counter shaft 40. One end of the output shaft 37 (the left end in the traveling direction in the present embodiment) projects outward from the body frame 6 to fix the gear 38. The gear 38 meshes with a first counter gear 40 a fixed to the counter shaft 40, and a second counter gear 40 b configured integrally with the first counter gear 40 a is connected to a drive gear 41 fixed on the drive shaft 16. Meshed. The gear 38, the first counter gear 40a, the second counter gear 40b, and the drive gear 41 are covered with a gear cover 39 (FIG. 1) provided on the left outer surface of the machine body frame 6. Thus, the rotation of the output shaft 37 is transmitted to the drive shaft 16.

  On the other hand, a traveling speed change shaft 42 is pivotally supported in the front-rear direction above the output shaft 37 in the body frame 6, and the rear portion of the traveling speed change shaft 42 is connected to the travel speed change lever 26, so To rotate. As shown in FIG. 4, one end of a rearward L-shaped transmission arm 43 is fixed to the front portion of the traveling transmission shaft 42 and protrudes downward. A substantially U-shaped engagement groove is formed at the tip of the transmission arm 43, and the engagement groove is engaged with engagement pins 36a and 36a protruding in the front-rear direction from the connecting ring 36. Thus, the friction plate 35 fixed to the boss portion 35a spline-fitted on the output shaft 37 rotates together with the output shaft 37, but the connecting ring 36 on the boss portion 35a rotates because a bearing is interposed. However, the rotation of the speed change arm 43 engaged with the engagement pin 36a of the connecting ring 36 can cause the output shaft 37 to slide left and right, and the friction plate 35 slides left and right together with the connecting ring 36. Moved.

  In such a configuration, when the traveling speed change lever 26 is rotated to perform a speed change operation, the traveling speed change shaft 42 is rotated and the speed change arm 43 is swung left and right. By this swinging, the friction plate 35 is slid left and right on the output shaft 37, the contact position with the speed change plate 34 is changed, and the speed change is performed. That is, when the friction plate 35 is in contact with the center position of the transmission plate 34, the friction plate 35 is not rotated but is in a neutral position. Since the circumferential speed increases with increasing distance from the center in the outer circumferential direction, the friction plate 35 is transmitted from low speed rotation to high speed rotation. In addition, if it is slid from the center to the left or right side, it becomes forward rotation, and if it is slid to the other side, it can be reverse rotation.

  Further, a rotation fulcrum shaft 51 of the speed change plate 34 is supported laterally with respect to the body frame 6 in the left-right direction in front of the output shaft 37, and a boss member 52 is fitted on the rotation fulcrum shaft 51. Has been. The boss member 52 is formed in a pipe shape, and the bearing 33 is fixed on the left and right sides of the boss member 52 via a stay. The axial center of the boss member 52 and the axial center of the bearing 33 are arranged in the orthogonal direction. The base end of the traveling clutch arm 54 is fixed on the left and right other sides of the boss member 52, a wire is connected to the distal end of the traveling clutch arm 54, and the other end of the wire is connected to the traveling clutch lever 24. is doing.

  In such a configuration, when the traveling clutch lever 24 is rotated to pull the wire, the traveling clutch arm 54 is rotated rearward, and the bearing 33 and the transmission plate 34 are integrally moved rearward via the boss member 52. And the friction plate 35 and the transmission plate 34 come into contact with each other so that power can be transmitted. Conversely, when the travel clutch lever 24 is rotated in the opposite direction, the friction plate 35 and the transmission plate 34 are separated. As a result, power transmission to the output shaft 37 is interrupted. The travel clutch arm 54 is urged in a direction in which the friction plate 35 and the transmission plate 34 are separated from each other by a spring (not shown).

Next, a configuration for easily replacing the friction plate 35 according to the present invention will be described.
As shown in FIGS. 3, 4, and 5, as described above, the continuously variable transmission includes the disk-shaped transmission plate 34 and the disk-shaped friction plate 35 and is housed in the body frame 6. The body frame 6 also serves as a speed change frame, and the body frame 6 is configured in a box-shaped housing. In this embodiment, the plate is bent in a U-shape to form a frontal portal type, the front surface is closed by a front plate 60, the rear surface is closed by a rear plate (not shown), and the lower surface is closed by a bottom plate (not shown). However, it may be integrally configured like a square tube.

  The upper surface of the body frame 6 is provided with an opening 6a through which a belt for transmitting power from the engine 15 to the snow removal unit and the traveling unit is passed, and the left and right side plates 6L and 6R are respectively provided with a drive shaft 16 and an output shaft 37. A shaft hole for supporting the counter shaft 40 and the like is opened.

  As shown in FIGS. 5 and 6, an extraction hole 6 b is opened in the side plate 6 </ b> R on one side of the body frame 6 in order to remove the friction plate 35 from the output shaft 37. That is, in the present embodiment, the right side plate 6R opposite to the gear cover 39 has an extraction hole 6b opened at the portion supporting the output shaft 37 with its axis center aligned. The size of the extraction hole 6b may be a circular hole that is slightly larger than the friction plate 35 as the simplest configuration. The shape of the extraction hole 6b is not limited as long as it is larger than the friction plate 35. Since the friction plate 35 can be taken out by being inclined, in this embodiment, the hole is slightly larger than a semicircle, and the hole is made as small as possible to prevent the strength of the machine frame 6 from being lowered. Yes. The front upper portion is opened in a semicircular shape so as not to interfere with the lower mounting portion of the steering handle 21, and the rear lower portion where the lower portion of the steering handle 21 is located is closed (the opening area is reduced). The shape is generally “D”. However, when the attachment hole 35b at the center of the friction plate 35 is enlarged, the extraction hole 6b is elliptical, and the maximum length of the ellipse is larger than the diameter of the friction plate 35, the friction plate 35 causes the output shaft 37 to move. It is possible to pass through the extraction hole 6b with a large inclination in the penetrating state, and to further reduce the strength by configuring the opening area of the extraction hole 6b to be smaller, and the lid can also be made smaller.

  And the said extraction hole 6b is set as the structure closed by the bearing member 62 used as a cover body. The bearing member 62 includes a plate 62a having a size capable of closing the extraction hole 6b, and a bearing body 62b including a bearing for rotatably supporting the output shaft 37. The bearing body 62b is the center of the plate 62a. It is fixed with a bolt or the like to the shaft insertion hole portion opened in the portion. The mounting holes 62c, 62c,... Are opened around the plate 62a at appropriate intervals, and the mounting holes 6c, 6c,. Bolts are inserted into the mounting holes 62 c and 6 c to fix the bearing member 62 to the body frame 6. The plate 62a is formed by bending both sides thereof into an L shape in order to increase the strength.

In the configuration as described above, when removing the friction plate 35, first, the main body of the snowplow 1 is placed on the work table or is tilted forward so that the output shaft 15a is in the vertical direction. In this state, after removing the rear plate and the bottom plate, the bolts fixing the bearing member 62 are removed, and the bearing member 62 is removed to open the extraction hole 6b opened in the side plate on one side. Next, the tool is pushed through the take-out hole 6b, the bolts fixing the friction plate 35 are removed, and the friction plate 35 is removed from the boss portion 35a. The friction plate 35 is moved to the side of the take-out hole 6b, and the friction plate 35 is inclined at the end of the output shaft 37 so as to pass through the take-out hole 6b to be extracted between the body frame 6 and the crawler belt 20. Take out from. In this way, the friction plate 35 can be easily taken out in a short time without pulling out the output shaft 37.
And when assembling, the reverse operation to the above is performed. That is, the friction plate 35 is inserted while being inclined from the space between the machine body frame 6 and the crawler belt 20 to the take-out hole 6b, and is slid on the output shaft 37 and fixed to the boss portion 35a with the bolt. Then, the assembly is completed by fixing the bearing member 62 to the side plate 6R with a bolt, closing the take-out hole 6b, and fixing the rear plate and the bottom plate.

1 is an overall side view of a snowplow equipped with a friction disk transmission. The left view of a friction disc transmission. The top view of a friction disc type transmission. The disassembled perspective view of a friction disk type transmission. The right view of a body frame. The perspective view of a body frame and a crawler type travel device in the state where a bearing member was removed. Sectional drawing of a transmission part.

Explanation of symbols

6 Airframe frame (shift frame)
6b Extraction hole 35 Friction plate 37 Output shaft 62 Bearing member

Claims (1)

A friction disc type transmission is housed in a box-type transmission frame, and both sides of an output shaft to which the friction plate of the friction disc type transmission is attached are supported on the side plate of the transmission frame, A transmission comprising a side plate that supports one side and an extraction hole having a size that allows the friction plate to pass therethrough, and the extraction hole is closed by a bearing member.

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