JP2002089602A - Coil spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil spring that is improved to prevent a surging phenomenon of a spring body and thus prevent breakage of a hook portion. SOLUTION: The coil spring 15 has hook portions 15b at both ends of a spring body 15a, and establishes an elastic action of the spring body 15a with the hook portions 15b engaged with two points of elastic support to connect them. A shock absorbing material of elastic material is annexed to the spring body 15a along the length thereof. The shock absorbing material is a tubular body 16 of soft elastic material, and the tubular body 16 is fitted internally with the outer circumference in contact with the inner circumference of the spring body 15a, or another tubular body 18 is fitted externally with the inner circumference in contact with the outer circumference of the spring body 15a. The shock absorbing material is alternatively a columnar body 17 of soft elastic material, and the columnar body 17 is fitted internally with the outer circumference in contact with the inner circumference of the spring body 15a. The shock absorbing material prevents a surging phenomenon of the spring body 15a to prevent breakage of the hook portions 15b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil spring improved so as to prevent a surging phenomenon of a spring main body and breakage of a hook portion.

[0002]

2. Description of the Related Art Conventionally, a spring body has hook portions at both ends thereof, and the hook portions are erected at two points of a working machine on which an engine is to be held, so that the spring body acts elastically. Coil springs (tension springs) are known.

[0003] As described above, when a coil spring is installed on a working machine on which an engine is mounted, the coil spring has a spring body due to vibrations caused by the engine or body vibrations caused by the operation of the machine. A surging phenomenon that violently waved occurred, and the hook part was sometimes broken. In order to prevent this, the diameter of the spring is increased or the material of the spring is changed to an advanced one, etc., but this significantly increases the cost and also reliably prevents the surging phenomenon. There was no guarantee that they could.

[0004]

SUMMARY OF THE INVENTION The present invention prevents the above-mentioned surging phenomenon of a coil spring so that it is not necessary to increase the wire diameter of the spring or to change the material of the spring to an advanced one. It is intended to solve the above problems.

[0005]

To achieve the above object, the present invention has the following arrangement. A. A coil spring having hook portions at both ends of a spring body and extending over two points at which the hook portions are to be resiliently operated by the spring body, wherein the elastic body extends along the length direction of the spring body. It is characterized in that a cushioning material consisting of

B. The cushioning material is formed into a tubular body by a soft elastic body, and the tubular body is fitted with its outer peripheral surface in contact with the inner peripheral surface of the spring main body or its inner peripheral surface in contact with the outer peripheral surface of the spring main body. It is characterized by being inserted.

C. The buffer member is formed of a soft elastic body into a columnar body, and the columnar body is fitted with its outer peripheral surface in contact with the inner peripheral surface of the spring body.

[0008]

With the above arrangement, the coil spring of the present invention performs the following operations. . The above A. With the configuration described above, the surging phenomenon of the spring main body is prevented by the cushioning member made of an elastic body attached along the length direction of the spring main body, and the breakage of the hook portion is prevented.

[0009] B. above. According to the above structure, the cylindrical body formed of the soft elastic body as the cushioning material is fitted with its outer peripheral surface in contact with the inner peripheral surface of the spring main body or its inner peripheral surface in contact with the outer peripheral surface of the spring main body. By doing so, the surging phenomenon of the spring body is prevented by the tubular body, and furthermore, the tubular body does not displace with respect to the spring body and is prevented from falling off.

[0010] C. above. With the configuration of the above, the columnar body formed of a soft elastic body as a cushioning material is fitted by inserting the outer peripheral surface thereof into contact with the inner peripheral surface of the spring main body,
The surging phenomenon of the spring main body is prevented by the columnar body, and further, the columnar body does not shift with respect to the spring main body, and is prevented from falling off.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a snow blower will be specifically described below with reference to the accompanying drawings. 4 to 6, reference numeral 1 denotes a self-propelled walking snowplow. The snowplow 1 is equipped with a pair of left and right crawler traveling devices 3 below a base 2, and an engine is mounted on the base 2. Part 4
And a hydraulic device, etc., and a hydraulic continuously variable transmission (HSS) (not shown) is provided below the base 2 behind the engine unit 4.
T) is mounted, and a bar-type steering handle 6 and an operation unit 7 are provided on the upper side thereof. On the front side of the base 2, a snow removing section (auger section) 8 capable of floating and rolling control, and an upper part extending from the snow removing section 8 to throw snow blown by the blower 9 after being scraped by the snow removing section 8. Snow chute 10 and snow chute 10 in which the snow throw direction can be changed
A snow throwing angle adjusting cylinder 11 capable of adjusting the snow throwing angle is provided on the upper side, and the snow removing operation is performed together with the forward running of the body.

As shown in detail in FIGS. 2 and 3, the snow removing section 8 is supported by the engine section 4 via a rolling shaft 12 so as to be able to roll left and right. Power is transmitted to the motor 8 via a power transmission mechanism 13. A tension pulley 14 is provided in the power transmission mechanism 13, and the power from the power transmission mechanism 13 to the lower auger 8 a, the upper auger 8 b, and the blower 9 is connected / disconnected by the action of the tension pulley 14. A coil spring 15 according to the present invention, which urges the tension pulley 14 in a direction away from the tension belt when power is cut off, is provided between the tension pulley 14 and the body.

As shown in FIG. 1, the coil spring 15 has hook portions 15b at both ends of a spring body 15a, and the hook portions 15b, 15b are installed on the tension pulley 14 side and the machine body side. Spring body 15a
A cylindrical body 16 made of a soft elastic body and made of a rubber plate is used as a cushioning material for preventing a surging phenomenon of the spring body.
a is fitted in contact with the inner peripheral surface of a. Alternatively, a cylindrical body 18 formed by a rubber plate into a tube (tube) slightly larger in diameter than the cylindrical body 16 is fitted and inserted with its inner peripheral surface in contact with the outer peripheral surface of the spring body 15a. Alternatively, a cushioning material is formed on the columnar body 17 with a sponge, and the columnar body 17 is fitted with its outer peripheral surface in contact with the inner peripheral surface of the spring body 15a.

In this case, in the cylindrical body 16, the opposed end surfaces obtained by rolling the rubber plate into a cylindrical shape are free without joining, and the cylindrical body 16 can be freely resilient in the spring body 15a, and the outer peripheral surface thereof Is pressed against the inner peripheral surface of the spring body 15a. Further, the cylindrical body 18 is formed by integrally joining opposing end surfaces obtained by rolling a rubber plate into a cylindrical shape, and making the inner diameter thereof slightly smaller than the outer diameter of the spring main body 15a to form a tube (tube). The tubular body 18 is fitted outside the spring body 15a. Further, the columnar body 17 is formed with a sponge so that the outer diameter is slightly larger than the inner diameter of the spring main body 15a, and is fitted into the spring main body 15a.

The snow removing section 8 scrapes the snow by the lower auger 8a and the upper auger 8b, collects the collected snow at the center in the left and right directions, and is blown upward by the blower 9 from here. The blown-up snow is thrown laterally through a snow throwing chute 10 and a snow throwing angle adjusting cylinder 11. The snow throwing direction of the snow throwing chute 10 is adjusted by a rotation angle adjusting cylinder 19 of the snow throwing chute. The vertical angle of the snow throw of the snow throw angle adjusting cylinder 11 is adjusted by a snow throw angle adjusting cylinder 20. The engine unit 4 is provided with a snowplow main body light 21, and the snow throwing chute 10 is provided with a snow throwing chute light 22, which enables nighttime snow removing work.

A cylinder (not shown) is interposed between the snow removing section 8 and the base 2 in a lateral direction, and the snow removing section 8 and the snow throwing chute 10 are controlled to rotate left and right (rolling) by expansion and contraction of the cylinder. . The expansion and contraction operation of the cylinder is performed by switching a solenoid valve (not shown) by a snow removal section rolling operation lever provided in the operation section 7.
The switching of expansion / contraction and free movement of the hydraulic cylinder for rotating the snow removing unit 8 left and right is performed by an automatic / manual switching lever.
Is switched between automatic and manual. And
When the rolling of the snow removing unit 8 is switched to manual, the rolling of the snow removing unit 8 is controlled by tilting the manual operation lever of the snow removing unit rolling left and right. Further, even when the rolling control of the snow removing unit 8 is set to the automatic horizontal state, the manual operation using the snow removing unit rolling control dial is possible, and when the manual operation is released, the snow removing unit 8 returns to the automatic horizontal state,
An automatic level control device capable of performing automatic level control even when the rolling control of the snow removing section 8 is controlled to be inclined is provided. All of these controls are performed in connection with the electronic control circuit.

The snow removing section 8 is composed of a lower auger 8a and an upper auger 8b, which scrape opposing snow cover with the advancing of the fuselage and collect the collected snow at the center from both left and right sides. Blow up by
Snow is thrown through the snow throw chute 10 and the snow throw angle adjusting cylinder 11. Further, the snow throwing chute 10 changes the snow throwing direction by rotating the chute turning portion by the cylinder 19, and changes the vertical angle of the snow throwing angle adjusting cylinder 11 by the cylinder 20 to adjust the snow throwing distance. Grounding sledges are provided at both left and right ends of the snow removing unit 8, and when the rolling of the snow removing unit 8 is automatically performed, the snow removing unit 8 moves in a ground contact state or a snow contact state.

The operation of the cylinder 19 of the snow throwing chute 10 and the cylinder 20 of the snow throwing angle adjusting cylinder 11 is performed by raising and lowering the snow removing section.
A snow throwing angle adjusting cylinder 1 when tilted to one side in the left-right direction by a snow throwing distance / direction adjusting switch provided on the top (or near the top) of the body left-right turning lever.
When the snow throwing distance is tilted to the other side in the left-right direction by operating 1, the chute rotating unit is operated to adjust the left and right snow throwing directions of the snow throwing chute 10.

The operating section 7 includes a snow removing clutch for connecting / disconnecting power to the lower auger 8a, the upper auger 8b and the blower 9 of the snow removing section 8, a throttle lever for controlling the rotation speed of the engine section 4, and an engine section. A traveling clutch that connects / disconnects the power of 5 from 4 to the transmission to turn on / off the traveling by the crawlers 3 and 3, a forward / backward movement of the fuselage, a speed adjustment lever that switches the rotation speed of the snow removing unit 8 by stepless speed change, an emergency stop Switches and the like are provided. In addition, the steering handle 6
An emergency stop lever is provided on the lower side.

In the walking type snow blower 1 having such a configuration, the power from the engine unit 4 is transmitted to the transmission 5 and the snow removal unit 8 by operating various operation devices in the operation unit 7.
And the like, and controls the two hydraulic cylinders, the chute rotating portion, the snow throwing angle adjusting cylinder 11 and the like. Then, the crawler 3 is driven and the body travels, and the snow removing unit 8,
The snow throwing chute 10 and the snow throwing angle adjusting cylinder 11 perform a snow removing / snow throwing operation. At the time of such snow removal work, the aircraft is traveling at a low speed, and pivoting or super pivoting is performed at a low speed.

The tension pulley 14 of the power transmission mechanism 13
In the prior art, the coil spring 15 erected between the engine unit 4 and the body is provided with a lower auger 8 a of the engine unit 4 and the snow removing unit 8.
In addition, the spring body 15a causes a surging phenomenon due to vibration from the upper auger 8b, the blower 9, and the like, so that the hook portions 15b and 15b are easily broken.
Any one of the cylindrical body 16, the cylindrical body 18, and the columnar body 17 that elastically contacts with and absorbs vibration to prevent the surging phenomenon is inserted, so that the surging phenomenon of the spring body 15a is reliably prevented. You. For this reason, the hook portions 15b,
15b is hard to break, and the durability is improved. As a result, the allowable stress limit of the coil spring 15 can be set, and the material and strength do not need to be increased more than necessary, so that the cost can be reduced. Further, by using any one of the tubular body 16, the tubular body 18, and the columnar body 17 of the present invention for the spring body of the conventional coil spring,
Durability can be improved.

[0022]

As described above, according to the coil spring of the present invention, the following functions and effects can be obtained.

[0023] Along the length of the spring body,
Since the cushioning member made of an elastic body is added, the vibration is absorbed by the cushioning member made of the elastic body, so that the surging phenomenon of the spring body can be prevented, and the breakage of the hook portion can be prevented. Therefore, it is possible to set the margin of the allowable stress of the coil spring, and it is not necessary to increase the material and the strength more than necessary, so that the cost can be reduced. Also,
The durability can be improved by using the cushioning material of the present invention for the spring body of the conventional coil spring.

[0024] The cushioning material is formed into a tubular body by a soft elastic body, and the tubular body is fitted with its outer peripheral surface in contact with the inner peripheral surface of the spring main body or its inner peripheral surface in contact with the outer peripheral surface of the spring main body. Therefore, the surging phenomenon of the spring main body is prevented by the cylindrical body, and further, the cylindrical body does not displace with respect to the spring main body and can be prevented from falling off.

[0025] The cushioning material was formed into a columnar body by a soft elastic body, and this columnar body was fitted with its outer peripheral surface in contact with the inner peripheral surface of the spring main body, so that the surging phenomenon of the spring main body was prevented by the columnar body, and The columnar body does not shift with respect to the spring body, and can be prevented from falling off.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a coil spring according to the present invention, in which (a) shows a state in which a cylindrical body formed of a rubber plate is fitted with its outer peripheral surface in contact with the inner peripheral surface of a spring main body;
(B) is a state in which a columnar body in which a sponge is formed in a columnar shape is fitted with its outer peripheral surface in contact with the inner peripheral surface of the spring body;
(C) is a state in which a large-diameter tubular body formed of a rubber plate is fitted with its inner peripheral surface in contact with the outer peripheral surface of the spring body.

FIG. 2 is a partial rear view of a snow removing unit, a blower, and a snow throwing chute.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of the entire snowplow to which the coil spring according to the present invention is applied.

FIG. 5 is a plan view of the same.

FIG. 6 is a front view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Walking snow remover 2 Base 3 Crawler running device 4 Engine part 5 Transmission 6 Steering handle 7 Operation part 8 Snow removing part (auger part) 8a Lower auger 8b Upper auger 9 Blower 10 Snow throwing chute 11 Snow throwing angle adjusting cylinder 12 Snow removing Rolling shaft of part 13 Power transmission mechanism 14 Tension pulley 15 Tension return coil spring 16 Cylindrical body with rubber plate formed into a cylindrical shape 17 Columnar body with sponge formed into a column shape 18 Large diameter with rubber plate formed into a cylindrical shape Cylindrical body 19 Cylinder for rotation angle adjustment of snow throwing chute 20 Cylinder for snow throwing angle adjustment cylinder 21 Light for snowplow body 22 Light for snow throwing chute

Claims (3)

[Claims] 1. A coil spring having a hook portion at both ends of a spring body and extending at two points at which the hook portion is to be resilient, and the spring body acts elastically. A coil spring characterized in that a cushioning member made of an elastic body is provided along the coil spring. 2. The cushioning material is formed into a tubular body by a soft elastic body, and the tubular body is formed so that its outer peripheral surface is in contact with the inner peripheral surface of the spring main body or its inner peripheral surface is formed by the outer peripheral surface of the spring main body. The coil spring according to claim 1, wherein the coil spring is fitted in contact with the surface. 3. The spring according to claim 1, wherein the cushioning member is formed of a soft elastic body into a columnar body, and the columnar body is fitted with its outer peripheral surface in contact with the inner peripheral surface of the spring body. coil spring.