JPH0724599Y2 - Connection device between levers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is applied to, for example, a connecting device between a throttle lever and a governor lever of a carburetor in a general-purpose internal combustion engine. The present invention relates to a connecting device between levers configured to interlock the operation of two levers arranged apart from each other via a connecting link.

[Prior Art] In a connecting device between levers of this type, a link spring for pulling the two levers together is stretched between the two levers so that both end portions of the connecting link and both end portions of the link are connected. The clearances between the levers and the locking holes formed at the tips of both levers are always in one direction so that no play occurs in the interlocking operation of both levers.

Further, by forming a coil portion in the intermediate portion of the link spring and winding the coil portion around the coupling link, the link spring is always kept along the coupling link and the spring force is sufficiently exerted. At the same time, the space required for mounting the entire coupling device is minimized. (For example, refer to JP-A-60-56154 and JP-A-60-195942).

By the way, in a general-purpose internal combustion engine or the like, an interfering object such as an engine body or a fuel tank may exist between the two levers, and a step may be formed on the operating surfaces of both levers. In such a case, since both levers cannot be connected linearly, the following connecting means has been adopted.

7 and 8 show an example of a conventional lever-to-lever connecting device. In FIG. 7, reference numeral 1 denotes a carburetor for a general-purpose internal combustion engine, inside of which a chain yoke valve and a throttle valve (not shown) are provided. There is. Reference numeral 2 is a throttle lever integrally attached to the throttle valve via a shaft 3 and swings in the direction aa in FIG.

Reference numeral 4 denotes a governor lever, which is arranged at a distance from the slotter lever 2 and swings in the same direction as shown in FIG. This governor lever 4 and the slottle lever 2
Means that there is a step indicated by h in FIG. 8 between the rocking surfaces thereof, and a part 5 of the engine body and a part 6 of the fuel tank are arranged in the step h between the levers 4 and 2. ing.
Further, circular locking holes 4A and 2A are formed at the tip ends of the levers 4 and 2, respectively.

Reference numeral 7 is a connecting link for interlocking the swing motion of both levers 4 and 2, which is formed in a staircase shape having bent portions 7A and 7B at two places in the middle thereof, and the interlocking swing motion of both levers 4 and 2 is performed. It is configured so as not to come into contact with the engine body part 1 and the fuel tank part 6 during operation. In addition, at both ends of the connecting link 7, both levers 4,
L-shaped engaging portions 7C and 7C (see FIG. 12) which are engaged with the locking holes 4A and 2A at the tip of the second member 2 in a retaining state are formed.

Reference numeral 8 is a link spring, and a coil portion 8A having an appropriate number of turns is formed in the middle portion thereof, and hook-shaped engaging portions having a substantially semi-circular arc shape are formed at both end portions as clearly shown in FIGS. 11 and 12. 8C and 8C are formed. As shown in FIG. 8, the coil portion 8A of the link spring 8 has an intermediate straight portion 7D of the connecting link 7 or as shown in FIG.
Although not shown, the linear portion 7E on the throttle lever 2 side is wound around the linear portion 7F on the governor lever 4 side, and the hook-shaped engaging portions 8C, 8C are locking holes for both levers 4, 2.
By tensioning the levers 4 and 2 so as to be engaged with the levers 4A and 2A respectively, the levers 4 and 2 exert a force of attracting each other to eliminate play.

Also in FIG. 10, similarly to the above, the connecting link 7 is formed in a staircase shape having bent portions 7A and 7B at two places in the intermediate portion.
Another example of the conventional lever-to-lever connecting device in which the throttle lever 2 and the governor lever 4 are interlocked with each other via the. In this example, the intermediate straight line portion 7D of the connecting link 7 and the straight line portions 7 on both sides of the intermediate portion of the link spring 8 are provided.
A coil portion 8A having a length corresponding to a range extending over a part of E and 7F is formed, and the coil portion 8A having a large number of turns is wound around the connecting link 7 so that the link spring 8 has both the levers 2,
The link spring 8 is stretched between the four links so that the link spring 8 extends along the entire length of the link link 7.

[Problems to be Solved by the Invention] Among the above-described conventional lever-to-lever connecting devices shown in FIG. 8 and FIG. 9, the action direction of the spring force by the link spring 8 is the operation of both levers 2 and 4. Since it is inclined with respect to the direction, the component force of the spring force of the link spring 8 acts on the levers 2 and 4 as a pulling force so as to prevent play. Therefore, in order to apply a required pulling force to both levers 2 and 4, it is necessary to increase the spring constant of the link spring 8. Further, since the link spring 8 does not follow the connecting link 7, the mounting space of the entire connecting device becomes large, which is not preferable for the arrangement of surrounding components.

Further, in the structure shown in FIG. 10, since the link spring 8 is in the posture along the connecting link 7 over the entire length thereof, the mounting space can be reduced, but the number of windings of the coil portion 8A is increased and a sufficient pulling force is exerted. Hard to get.

Further, in the conventional coupling device between levers, since the hook-shaped engaging portions 8C at both ends of the link spring 8 have a substantially semi-circular shape, the spring force of the link spring 8 normally causes the engagement between the levers 2 and 4. In the stop holes 2A, 4A, the hook-shaped engaging portion 8C and the L-shaped engaging portions at both ends of the connecting link 7 are formed.
Although it is separated from 7C (see the solid line in FIG. 12), when a force greater than the spring force of the link spring 8 is applied to the connecting link 7 such as sudden acceleration in a general-purpose internal combustion engine,
The L-shaped engaging portion 7C of the connecting link 7 moves in the locking holes 2A and 4A in the direction of arrow f in FIG. 12, and as shown by the phantom line in the figure, the hook-like engaging portion 8C of the link spring 8 is formed. Hit the top of the
It was a big shock.

The present invention has been made in view of the above, and it is possible to suppress the increase in the spring constant and the increase in the number of turns of the link spring,
An object of the present invention is to provide a connecting device between levers that can apply a required pulling force to two levers and can reduce a mounting space.

Another object of the present invention is to further enhance the durability of the link spring.

[Means for Solving the Problem] In order to achieve the above object, a lever connecting device according to a first aspect of the present invention includes two levers having the same operation direction and spaced from each other. A connecting link having a plurality of bent portions in the middle portion, and engaging both ends of the bent portions with locking holes formed at the tip portions of the two levers to interlock the operation of the both levers; A lever-to-lever connecting device having a coil portion wound around a connecting link and comprising a link spring stretched between the two levers so as to draw the two levers toward each other. A plurality of coil portions wound around the plurality of bent portions of the connecting link are formed.

In the lever connecting device according to the second aspect of the present invention, the hook-shaped engaging portions at both ends of the link spring are formed in a U-shape.

[Operation] According to the invention of claim 1, the plurality of coil portions formed in the link spring are wound around the plurality of bent portions of the connecting link suspended between the two levers, respectively, and the space between the levers is increased. By stretching the link spring over the link spring, the link spring can be in a posture along the connecting link over the entire length, and the spring force of this link spring can be made to coincide with the operating direction of both levers.
A sufficient pulling force can be exerted while using a link spring having a small spring constant.

Further, according to the invention of claim 2, a force equal to or greater than the spring force of the link spring is applied to the connecting link, and the engaging portions at both ends of the connecting link move rapidly in the locking holes of the levers to link. Even if the hook-shaped engaging portions on both ends of the spring are strongly collided with each other, since the contact width between them is wide and the impact force is small, the hook-shaped engaging portions are not deformed or locally broken. This suppresses the durability of the link spring, which is generally composed of a thin wire rod, and the predetermined lever pulling function of the link spring can be stably maintained for a long period of time.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment of the present invention.
1 to 8 in FIGS. 1 and 2 are the same as those in the conventional example shown in FIGS. 7 and 8, and therefore, corresponding parts are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 1 and FIG. 2, the link spring 8 is made to correspond to the two bent portions 7A and 7B of the connecting link 7, respectively, and as shown in FIG.
8A and 8B are formed, and hook-shaped engaging portions 8C and 8C at both ends are formed in a U shape.

As shown in FIG. 2, the two coil portions 8A and 8B are respectively wound around the bent portions 7A and 7B of the connecting link 7, and the linear portion 8D in the middle thereof is along the intermediate linear portion 7D of the connecting link 7, And,
Straight parts 8E and 8F on both sides are straight parts 7E and 7F on both sides of the connecting link 7.
The link spring 8 is stretched between the levers 2 and 4 in such a manner that the entire length of the link spring 8 is along the step-like connecting link 7 so as to substantially follow the above.

The hook-shaped engaging portion 8C having the U-shape is shown in FIGS.
As shown in the figure, it is locked in the locking holes 2A and 4A of the levers 2 and 4, and normally the spring force of the link spring 8
The intermediate connecting portion 8a is in contact with the innermost peripheral edges 2a, 4a of the locking holes 2A, 4A at a position closest to the mating levers 4, 2.
The intermediate connecting portion 8a of the U-shaped hook-shaped engaging portion 8C is formed to have substantially the same length as the connecting portion 7a of the L-shaped engaging portion 7C of the connecting link 7, and the connecting link 7 has a link spring. When a force greater than the spring force of No. 8 is applied to move in the direction of arrow f in FIG. 5 (B) and collide with the hook-shaped engaging portion 8C of the link spring 8, the contact width is sufficiently widened.

In the above configuration, the lever force of the link spring 8 stretched between the levers 2 and 4 causes both levers 2 and
4 are attracted to each other, and the levers 2 and 4 and the connecting link 7
Since the play between and is zero, both levers 2 and 4 can be interlocked while maintaining a one-to-one relationship. At this time, since the entire length of the link spring 8 is along the connecting link 7, the acting direction of the spring force thereof coincides with the operating direction of the levers 2 and 4, and the spring constant is small, and
A necessary and sufficient pulling force can be exerted on both levers 2 and 4 while using the link spring 8 having a small number of turns.

Further, since the space occupied by the connecting link 7 and the link spring 8 is small, the required mounting space for the entire connecting device can be made smaller than that of the conventional device shown in FIGS. 8 and 9.

Further, even if the connecting link 7 is moved by the force greater than the spring force of the link spring 8 and the engaging portions 7C, 8C at the ends engaged with the common locking holes 2A, 4A collide with each other. ,
Since the contact width between the two is wide, the impact is reduced, and in particular, the deformation and wear of the hook-shaped engaging portion 8C on the link spring 8 side can be suppressed.

FIG. 6 shows a second embodiment of this invention.

In the figure, the connecting link 7 is formed by bending the middle portion thereof into a V shape, and has three bent portions 7A1, 7B, 7A2.
have. The link spring 8 is formed with three coil portions 8A1, 8B, 8A2 which are discontinuous with each other in correspondence with the above-mentioned three bent portions 7A1, 7B, 7A2, respectively, and these three coil portions 8A1, 8B, 8A2 is wound around the three bent portions 7A1, 7B, 7A2 of the connecting link 7, and the link spring 8 is stretched between the levers 2 and 4. The other structure is the same as that of the first embodiment, and the same portions or corresponding portions will be denoted by the same reference numerals and the description thereof will be omitted.

Also in the case of the second embodiment, since the link spring 8 is in the posture along the connecting link 7 over its entire length,
In the same manner as in the above embodiment, the necessary and sufficient pulling force can be exerted on the levers 2 and 4 without increasing the spring constant of the link spring 8 or increasing the number of turns of the coil section more than necessary, and The installation space of the entire coupling device can be made as small as possible.

In each of the above-described embodiments, the link spring 8 is composed of a single spring wire rod. However, the same number of spring wire rods as the number of bent portions of the connecting link 7 are used, and each spring wire rod has one spring wire rod. A link spring may be used in which a coil portion is formed and then the spring wire rods are integrally joined by welding or the like.

Further, in the invention of claim 1, the hook-shaped engaging portions 8C at both ends of the link spring 8 include those having a substantially semicircular shape.

[Advantage of the Invention] As described above, according to the invention of claim 1, a link spring having a small spring constant and a small number of turns is used.
The two levers can be provided with the necessary and sufficient pulling force so that there is no play in their interlocking. Moreover, since the entire length of the link spring can be set along the bent connecting link, the installation space for the entire connecting device can be reduced, which is also advantageous for the arrangement of surrounding components.

Further, according to the invention of claim 2, the end engaging portion of the connecting link, which is commonly engaged with the locking hole of the lever, and the hook-like engaging portion of the end of the link spring suddenly collide with each other. Even
Since the contact width between the two can be widened, the impact force can be reduced to prevent the hook-shaped engaging portion on the link spring side from being deformed or locally broken. Therefore, in particular, the durability of the link spring composed of a thin wire rod can be improved, and the predetermined pulling function of the link spring can be stably maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing a first embodiment of the present invention,
2 is a plan view of FIG. 1, FIG. 3 is a side view of a link spring, FIG. 4 is an enlarged side view of a main portion, and FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a plan view of an essential part showing a second embodiment, FIG. 7 is a side view of an essential part of a conventional example, FIG.
FIG. 9 is a plan view of FIG. 7, FIG. 10 is a plan view of an essential part of another embodiment, FIG. 11 is an enlarged side view of an essential part of a conventional example, and FIG. 12 is an XII- of FIG. It is sectional drawing which follows the XII line. 2 ... Slot lever, 2A, 4A ... Locking hole, 4 ... Governor lever, 7 ... Connection link, 7A, 7A1, 7A2, 7B ...
Bent part, 7C ... L-shaped engaging part, 8 ... Link spring,
8A, 8B: Coil part, 8C: Hook-shaped engaging part.

Continuation of the front page (56) References: 1-157239 (JP, U). 59-115831 (JP, U)

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. Two levers having the same operating direction and spaced apart from each other, and a plurality of bent portions at an intermediate portion, and both ends thereof being formed at the tip portions of the two levers. It has a connecting link that engages with the stop holes to interlock the operation of both levers, and a coil part wound around this connecting link, and is stretched between both levers so as to draw the two levers together. In the coupling device between the levers provided with the link spring,
A connecting device between levers, wherein a plurality of coil portions are formed around a plurality of bent portions of the connecting link, respectively. 2. The connecting device between levers according to claim 1, wherein hook-shaped engaging portions at both ends of the link spring are formed in a U shape.