JPH04145249A - tension clutch - Google Patents

Abstract

PURPOSE:To improve the extent of operability by energizing a clutch lever, a tension pulley or the like in the on-direction at a time when the clutch lever is operated to the on-side, and those of lever, pulley or the like in the off- direction when operating it to the off-side, respectively. CONSTITUTION:When a clutch lever 19 is operated to the clutch on-side, a longitudinal shaft 37 is rotated counterclockwise, and a lonk arm 36 is also rotated in the same direction via a link arm 38 and a connecting rod 39. Accordingly a tension pulley 32 is pressed to a V belt 30 under pressure, making it into clutch engagement. At this time, since a coil spring 35 is shifted to the more inside than the longitudinal shaft 37, the tension pulley 32 is energized toward the V-belt 30, and the clutch lever 19 to the on-side, respectively. When the clutch lever 19 is turned round to the rear, the longitudinal shaft 37 is rotated clockwise, and the tension pulley 32 separates from the V-velt 30, making it into clutch disengagement. At this time the coil spring 35 energizes the tension pulley 32 in a separating direction from the V-belt 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a tension clutch with improved operability.

[Prior Art] A conventional tension clutch has a belt wound around an output shaft and an input shaft, and a tension pulley is provided between the output shaft and the input shaft. The tension pulley is brought into pressure contact with the belt by operating the clutch lever, increasing the tension of the belt to act as a clutch driver, and also applying weight to the belt to disengage the clutch. The tension pulley is attached to the tip of the rotating arm and performs pressure contact and separation operations against the belt.

[Problems to be Solved by the Invention] The above-mentioned conventional tension clutch is normally biased toward the r-in side in order to prevent the clutch from being accidentally switched due to a belt or an external impact.

However, because the load that presses the tension pulley against the belt is constantly applied to the tension clutch, a large amount of force is required when the operator moves the clutch lever to the ``off'' side. It's making sex worse.

Therefore, a technical problem arises that must be solved in order to improve the operability of the clutch lever of the tension clutch, and it is an object of the present invention to solve this problem.

[Means for Solving the Problems] The present invention was proposed to achieve the above object, and includes a pulley attached to the output shaft and an input shaft, a belt wound around the pulley, and a belt connected to the output shaft. In a tension clutch in which a tension pulley provided at an intermediate position between an input shaft and the belt can be press-contacted and separated from the belt, the tension pulley is attached to a link arm of a link mechanism that interlocks with a clutch lever, and a spring is attached to the link mechanism. When installed, the spring biases the clutch lever and tension pulley etc. in the ``on'' direction when the clutch lever is operated to the ``on'' side, and biases the clutch lever and tension pulley, etc. in the ``on'' direction when the clutch lever is operated to the ``off'' side. It is an object of the present invention to provide a tension clutch characterized in that a lever, a tension pulley, etc. are configured to be biased in the ``off direction''.

[Operation] According to the present invention, a tension pulley that presses the belt is attached to a link mechanism, and a spring is attached to the link mechanism. This spring moves in the ``on'' direction when the clutch lever is operated to the ``on'' side, and when the clutch lever is operated in the ``off'' direction.
When operated to the side, the tension clutch is energized in the OFF J direction.

Therefore, even if the clutch lever is always loaded with a load on the "one person" side, when it is operated to the "off" side, the spring will reduce the load, improving the operability of the clutch lever. can.

Furthermore, when the clutch lever is operated toward the ``in'' side, the spring urges the link mechanism in the ``in'' direction, that is, the tension pulley toward the belt, improving the operability of the clutch lever linked to the link mechanism. To improve this, and to surely press a tension pulley to a belt.

[Example 1] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 7 of the attached drawings.

In the figure, I is an ultra-compact excavator car, and as shown in FIG.
．． 4, and a crawler 6.6 is wound between the left and right front wheels 5.5 and the drive wheels 4, 4, respectively.

Further, as shown in FIG. 2, a swing bracket 7 is pivotally attached to the front end of the body 2, and an excavation device 8 is attached to the swing bracket 7. The excavation equipment ms consists of a packet 9, an arm 10, and a boom 11, which are rotated in the vertical direction by a packet cylinder 12, an arm cylinder 13, and a boom cylinder 14, and a swing cylinder whose tip end is connected to the swing bracket 7. 15, the excavation device 8 is turned left and right.

Further, the body 2 is covered with an exterior cover 16, and various levers are provided protruding from the upper part. Reference numeral 17.17 is a hydraulic control lever, which operates the packet 9 to excavate the ground or the like. 18. 18 is a travel lever, and the left and right crawlers 6
．． 6 are operated individually to move the ultra-compact excavator car 1 back and forth or turn left and right. I9 is a clutch lever that switches between the main clutch and the auxiliary gear. That is,
Moving the clutch lever 19 back and forth turns on and off a belt tension clutch, which will be described later, and turning the clutch lever 19 left and right changes the sub-speed shifter to high or low speed. 20 is a vertical movement lever of step 21.

As shown in FIGS. 3 and 4, an engine 22 is mounted on the upper part of the mission case 3, and a hydraulic pump 23 is mounted in front of the engine 22 of the aircraft body 2. An engine pulley 25 is attached to the output shaft 24 of the engine 22.
is fixedly installed, and a mission pulley 2 is attached to the input shaft 26 of the mission case 3 and the input shaft 27 of the hydraulic pump 23, respectively.
8 and a hydraulic pump pulley 29 are attached.

A V-belt 3° is wound around the engine pulley 25, transmission pulley 28, and hydraulic pump pulley 29, and a tension clutch 31 is attached to the negative side of the V-belt 3o.
is provided so that the power of the engine 22 can be transmitted to or disconnected from the transmission case 3 and the hydraulic pump 23. That is, when the clutch lever 19 is rotated forward, the tension pulley 32 of the tension clutch 31 comes into pressure contact with the V-belt 30 and becomes "clutch engaged", and when the clutch lever 19 is rotated backward, the tension The pulley 32 is configured to be "clutch disengaged" at a distance # from the V-belt 3o. In addition, numeral 33 in the figure is a fixed tension pulley, which is always in pressure contact with the V-belt 3o on the other side of the tension clutch 3I. Moreover, the engine pulley 25, the mission pulley 28, and the hydraulic pump pulley 29
are arranged on a straight line when viewed from the side, and are formed so that driving force can be transmitted by two V-belts 30.

As shown in FIG. 5, the tension clutch 31 is constructed by attaching a tension pulley 32 and a coil spring 35 to a link mechanism 34. The link mechanism 34 includes a first link arm 36 pivotally connected to the side of the engine pulley 25, a second link arm 38 fixed to a front-rear shaft 37 that rotates when the clutch lever 19 is operated, and It is comprised of a connecting arm 39 that interlocks the first and second link arms 36 and 38. The first link arm 36 is pivotally connected to the fuselage 2 on the left side of the engine pulley 25 when viewed from the front, and the lower end 36a is connected to the engine pulley 25 and the mission pulley 28 from the pivot portion 40. The other end 36b extends to the left side. Further, the second link arm 38 is formed to be shorter than the first link arm 36 and is disposed to the left of the lower end 36a of the first link arm 36. 38a to the longitudinal axis 37
It is fixedly attached to the tip and extends downward.

The link mechanism 34 is constructed by pivotally connecting both ends of a connecting arm 39 to the lower extending intermediate portion of the first link arm 36 and the intermediate portion of the second link arm 38 through pins 41 and 42. There is. Further, both ends of the coil spring 35 are locked to the side end 36b of the first link arm 36 and the middle part of the second link arm 38, and the lower end 36a of the first link arm 36 The tension pulley 32 is pivotally connected to.

When the clutch lever 19 shown in FIG. 6 is rotated forward and operated to the "clutch on" side, the longitudinal shaft 37 is rotated counterclockwise in FIG. 5 via the vertical shaft 43, etc. Rotate in the direction. Further, as shown in FIG. 5, the second link arm 38 rotates counterclockwise about the front-rear shaft 37.

Since the connecting rod 39 moves to the right in the figure, the first link arm 36 also rotates counterclockwise in conjunction with the second link arm 38. Therefore, the tension pulley 32 provided at the lower end of the first link arm 36 is
It comes into pressure contact with the belt 30 and becomes "clutch engaged". At this time, the coil spring 35 moves inward from the rotational fulcrum of the second link arm 38, that is, the longitudinal axis 37, so the second
The action of rotating the link arm 38 in the counterclockwise direction urges the tension pulley 32 in the V-bell direction 30, and also urges the clutch lever 19 toward the entrance side, that is, toward the front.

Note that the clutch lever 19 is always biased forward, that is, in the "clutch-on" direction, and a load is applied thereto, and this load, together with the load, ensures that the tension pulley 32 is moved toward the V-belt 30.
Press it against the

On the other hand, as shown in Figs. 5 and 6, the clutch lever
19 to the rear, the front-rear shaft 37 rotates clockwise in FIG. 5, contrary to the above, and the second link arm 38 accordingly rotates clockwise. Therefore, the first link arm 36 rotates clockwise in conjunction with the second link arm 38 via the connecting rod 39, and the seventh link arm 36 rotates clockwise.
As shown in the figure, the tension pulley 32 moves to the left in the figure and separates from the V-belt 3o. Therefore, it becomes a "clutch disengagement". At this time, the coil spring 35 moves outward from the rotation fulcrum of the second link arm 38, passing beyond the so-called dead center. Therefore, the coil spring 35 urges the second link arm 38 in a clockwise direction, that is, in a direction that moves the tension pulley 32 away from the V-belt 30.

However, as mentioned above, the clutch lever 19 is always urged forward, and the load on the coil spring 35 is smaller than the forward load, so the clutch lever 19 does not move backward by itself. No, but the worker is the clutch lever! Assists the operation when moving 9 backward. Also, the clutch lever 19 may be moved from the "off" position due to some kind of impact.
In order to prevent the clutch lever I9 from switching to the "on" state, a setting position 44 is provided in which the clutch lever I9 is held in the "off" state, as shown in FIG.

Note that this invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that this invention extends to such modifications.

[Effects of the invention] In this invention, when the clutch lever is on the "on" side, the tension pulley is biased toward the belt, and when the clutch lever is on the "off" side, the tension pulley is biased in the direction away from the belt. The spring acts on the link mechanism. Therefore, when the clutch is engaged, the tension pulley is securely pressed against the belt.Also, when the tension clutch is disengaged,
When operating the clutch lever to the side, the spring assists the operation, thereby improving the operability of the clutch lever.

Further, by adjusting the length of the link arm, the compression force of the spring, etc., the rotational load of the clutch lever can be appropriately set.

[Brief explanation of drawings]

Fig. 1 is a side view of the ultra-compact excavator car, Fig. 2 is a plan view of the same, and Fig. 3 is a side view showing the inside of the ultra-compact excavator car.
Fig. 4 is a front view of the main part, Fig. 5 is a front view of the main part showing the state in which the tension clutch is operated by one person, and Fig. 6 is a side view of the main part showing the state in which the clutch lever is connected. Figure 7 is a front view of the main parts showing the state in which the clutch lever is in the OFF position. 24 Output shaft 25 Engine pulley 26.27 Human power shaft 28 Mission pulley 29 Hydraulic pump pulley ■ Belt tension clutch tension pulley link mechanism coil Spring First link arm Second link arm

Claims (1)

[Claims] In the tension clutch, a pulley is attached to an output shaft and an input shaft, a belt is wound around the pulley, and a tension pulley provided between the output shaft and the input shaft is configured to be able to press against and separate from the belt. Attach the pulley to the link arm of the link mechanism that interlocks with the clutch lever, and attach a spring to the link mechanism, so that when the spring operates the clutch lever to the "on" side, the clutch lever and tension pulley etc. '' direction, and when the clutch lever is operated to the ``off'' side, the clutch lever, tension pulley, etc.
A tension clutch characterized in that it is configured to be biased in the "off" direction.