JPH0893869A - Springing pressure mechanism of endless transmission gear - Google Patents

Abstract

PURPOSE: To provide a springing pressure mechanism of an endless transmission gear capable of easily setting a twist springing pressure mechanism of press contacting performance of a press contacting wheel at small adjusting intervals as it can properly spring and pressurize a revolving arm while using a spring low in a spring constant. CONSTITUTION: A springing pressure mechanism 10 is engaged with an installation piece 23 engaging two pieces of left and right springs 20, 21 at least with a revolving arm 8 and pivotally on an installation part 13 provided with other ends of both of the springs 20, 21 on a frame 1 through an installation pin 22 free to oscillate, free to revolve like a balance around the installation pin 22 as its center in an endless drive suspending an endless belt 7 between a drive wheel and a driven wheel 4a and to transmit by press contacting a press contacting wheel 9 axially supported by the revolving arm 8 oscillating and revolving around an installation shaft 6 as its center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension mechanism for an endless transmission device for performing belt or chain transmission in a working machine such as a combine.

[0002]

2. Description of the Related Art Conventionally, in a working machine such as a combine, an endless transmission device using a belt as shown in FIG. 4 has been mainly used as a transmission means for rotationally driving a grain conveying spiral from an engine. That is, the transmission is the work machine 1
A belt (endless belt) is attached from a drive pulley (drive wheel) 4 fixed to a rotary shaft 3 of an engine 2 mounted on (Fig. 1) to a driven pulley 4a attached to a spiral shaft (rotary shaft) 6 of a grain transfer device 5. (Band) 7 is stretched, and one side of the loose side of the belt 7 is rotatably supported by the rotary shaft 6 on the tip end of a rotating arm 8 which is a tension pulley (pressing wheel). 9 is pushed through the elastic pressure mechanism 10 to transmit the power of the engine 2 to the rotating shaft 6, and the grain conveying device 5 is rotated to convey the grains.

The above-mentioned elastic pressure mechanism 10 comprises an adjusting screw 1 with lock nuts 12, 12 provided on a machine body frame 11.
A coil spring 20 is provided between the rotating arm 8 and the rotating arm 8, and the protrusion length of the adjusting screw 13 is adjusted to adjust the pulling force of the spring 20 to adjust the pressing force of the tension pulley 9. It is designed to be transmitted by the tension of 7.

[0004]

Since the conventional endless transmission is installed in a narrow area on the side of a shelling machine (not shown) or the like, it is automatically moved by pressing the tension of the tension pulley 9 automatically. A large adjustment distance L cannot be obtained. Therefore, it is necessary to use the spring 20 having a large spring constant in order to obtain a predetermined tension for proper transmission.

However, when such a strong spring 20 is used, when the engine 2 supported by the mount rubber in a vibration-proof structure is subjected to a sudden load with the clutch engaged, the belt 7 is vibrated or shaken due to vibration or the like. When the spring 20 is swung to the loose side, the spring 20 cannot follow the tension pulley 9 so as to appropriately press and transmit the tension pulley 9, and a transmission slip may occur. As a result, the helical shaft (rotary shaft) 6 There is a problem in that the initial drive becomes insufficient and the conveyance of the grain becomes clogged, making continuous transmission impossible.

Further, the belt 7 is apt to stretch due to the high heat generated by the engine 2, but in this case, it is difficult to adjust the tension of the spring 20 installed in the narrow portion at any time, and as a result, the spring 20 stretches the belt. However, there is a drawback that transmission failure occurs due to failure to follow up with.

[0007]

SUMMARY OF THE INVENTION The present invention provides an elastic mechanism for an endless transmission which solves the problems of the above-mentioned conventional device, in which an endless belt is stretched between a driving wheel and a driven wheel,
In the endless transmission device, which is transmitted by pressing a pressing ring, which is pivotally supported by a rotating arm that swings and rotates one side of the stretched endless band around a mounting shaft, by a pressing mechanism. At least two left and right springs are locked to the rotating arm, and the other ends of the both springs are pivotally supported by a mounting pin provided on the machine body frame so as to be swingably rotatable via a mounting pin. In addition, the mounting pin is locked so as to be rotatable around the mounting pin in a balance shape.

Further, of both springs locked to the rotary arm, the sprig locked to the mounting shaft side of the rotary arm is made a strong spring having a higher spring constant than the other springs, and the mounting piece. It is characterized in that a stopper for restricting rotation of the strong spring toward the locking side is provided.

[0009]

[Operation] With the above configuration, when the endless belt 7 is stretched or when a low load is transmitted, the pressing ring 9 is attached to the mounting shaft 6.
The elastic force is exerted by a plurality of springs 20 and 21 centering on the center, and the endless belt 7 is appropriately pressed and pressed to follow the endless belt 7 for reliable transmission. Further, when a high load is applied to the endless transmission and the endless belt 7 is stretched, the spring 2
While 0 and 21 allow the push contact wheel 9 to move quickly and smoothly, the endless belt 7 is pressed against the transmission load with an appropriate tension corresponding to the transmission load, so that the transmission can be performed satisfactorily and reliably.

[0010]

EXAMPLES Examples of the present invention will be described with reference to the drawings. The basic layout and transmission structure of the endless transmission according to the present invention are the same as the conventional structure described above, and therefore the description thereof will be omitted, and the main part of the elastic pressure mechanism 10 will be described with reference to FIG.

A plurality of springs having different spring constants, preferably two springs are used in the elastic pressure mechanism 10.
Specifically, a plurality of springs, a strong spring 20 having a thicker wire diameter and a stronger elastic force, and a weak spring 21 having a wire diameter smaller than the wire diameter and a lower elastic force, are used to rotate the arm 8. And the adjusting screw 13 are installed side by side.

That is, the strong spring 20 and the weak spring 2
The upper ends of the rotating arms 8 are sequentially arranged from the side of the mounting shaft 6 of the rotating arm 8 to engage with each other (strengthen the mounting shaft 6 side), and the lower ends of these are rotated to the upper end of the adjusting screw 13 by the mounting pin 22. Left and right engagement holes 23 of the mounting piece 23 pivotably supported
It is engaged and fixed to a and 23b. With the above configuration, when the belt 7 is stretched during use, and the engine 3
When loosening is caused by vibration (shaking), the strong spring 20 strongly pulls the rotation base side of the rotation arm 8 and the weak spring 21 weakly pulls the vicinity of the tension pulley 9 having a large rotation stroke. Tension pulley 9
Since the belt 7 is pressed and tensioned quickly and appropriately in response to the loosening margin of the belt 7, the transmission can be reliably performed without causing belt slip and the like.

Further, when the loose side of the belt 7 is pulled to reduce the winding angle to reduce the power transmission capability at the time of initial drive and high load transmission, both the springs 20 and 2 are used.
1 acts to suppress the upper part of the rotating arm 8 in each part, the tension pulley 9 presses the belt 7 appropriately to maintain the transmission winding angle, and prevents problems such as belt detachment and transmission slip. Good transmission can be performed smoothly.

At this time, the mounting piece 23 is shaped like a balance around the mounting pin 22 in accordance with the tensile force of expansion and contraction of the springs 20 and 21 with respect to the fluctuation of the pivoting arm 8 which is pivotally rotated. Since the springs 20 and 21 rotate and follow and are displaced, the springs 20 and 21 can be pulled in a proper parallel posture without being twisted or unnecessarily stretched.

As described above, since the mounting piece 23 has its posture stabilized at a portion where the tensile forces of the springs 20 and 21 are balanced around the mounting pin 22, the mounting holes (points of action) 32a and 23b of the springs 20 and 21 are provided. Forces that are almost equal will always act on. Also, two (plural)
Since the spring constant per one can be lowered by tensioning with the springs 20 and 21, the followability to the fluctuation of the belt 7 can be improved.

Further, as shown in FIG. 3, the above-mentioned mounting piece 23
By providing a stopper 24 on the side of the rotating direction when the rotating arm 8 moves upward, the pressing force when the tension pulley 9 is lifted by the belt 7 and moves upward is set as described above. Since the stopper 24 contacts the adjusting screw 13 and restricts its rotation, the strong spring 20 can act so as to suppress its upward movement, and the transmission can be reliably performed.

[0017]

The elastic force mechanism of the endless transmission according to the present invention is such that the endless belt is stretched between the drive wheel and the driven wheel, and one side of the endless belt is pivotally rotated about the mounting shaft. In an endless transmission device for transmitting by pressing a pressing wheel axially supported by an arm by an elastic pressure mechanism, at least two springs on the left and right of the elastic pressure mechanism are locked to the rotating arm, An end is locked to a mounting piece pivotally supported by a mounting pin provided on the body frame via a mounting pin so as to be rotatable in a balance-like manner about the mounting pin. are doing.

Therefore, since it is possible to appropriately press the rotating arm while using the spring having a low spring constant, it is possible to easily install the elastic pressing mechanism having the pressing performance of the pressing wheel within the narrow adjustment interval. Of the two springs that are locked to the rotating arm, the spring that is locked to the mounting shaft side of the rotating arm is a strong spring with a higher spring constant than the other springs, and the spring is strong on the mounting piece. A stopper that restricts the rotation of the spring toward the locking side is provided.

Therefore, when the rotating arm swings, the pressing force of both springs can be appropriately applied to the mounting portions of the rotating arm having different rotating distances, and the pressing ring can be moved against the fluctuation of the endless belt. Can be driven well, and at the time of high load, the rotation of the mounting piece is regulated to increase the pressing force of the pressing ring, preventing endless stripping and ensuring rolling. Can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing a main part of the present invention.

FIG. 3A is a front view of another embodiment, and FIG. 3B is a side view of a mounting piece portion.

FIG. 4 is a front view showing a conventional example.

[Explanation of symbols]

1 Working Machine 4 Drive Wheel 4a Driven Wheel 6 Mounting Shaft (Rotating Shaft) 7 Endless Belt (Belt) 8 Rotating Arm 9 Pushing Wheel (Tension Pulley) 10 Repression Mechanism 13 Mounting Part (Adjusting Screw) 20 Strong Spring 21 Weak ( Spring) 22 Mounting pin 23 Mounting piece 23a Stopper

Claims (2)

[Claims] 1. A pressurizing mechanism comprising a push-contact wheel axially supported by a rotating arm which stretches an endless belt between a drive wheel and a driven wheel and swings and rotates one side of the endless belt around a mounting shaft. In an endless transmission device that is transmitted by being pressed by, the at least two left and right springs are locked to the rotating arm of the elastic pressure mechanism, and the other ends of the both springs are attached to a mounting portion provided on a body frame. An elastic force mechanism for an endless transmission, comprising a mounting piece pivotally supported via a shaft so as to be pivotally movable around the mounting pin in a balance-like manner. 2. Of both springs locked to the rotary arm, the spring locked to the mounting shaft side of the rotary arm is a strong spring having a higher spring constant than the other springs, and is mounted. The elastic force mechanism for an endless transmission according to claim 1, wherein a stopper for restricting rotation of the strong spring toward the locking side is provided on one piece.