JPH01168548A - Rectilinear rotation converting mechanism for push-and-pull control cable - Google Patents

Abstract

PURPOSE:To make transmission in a large angle range performable as well as to convert rotation into reciprocating motion smoothly by constituting a tip of an inner cable, extending from a conduit of a push-and-pull control cable, to be clamped to a connecting rod in a state of running along the longitudinal direction of this connecting rod. CONSTITUTION:When a crank arm 5 is rotated in an arrow D direction of up to a top dead center C2 from a bottom dead center C1, compressive force is added to an inner cable 15, but an edge of this inner cable is forcedly directed to the longitudinal direction of a connecting rod 13 all the time, and that is is directed toward a conduit 29 even in position of a fixture 30. Consequently, a direction of compressive force is always directed to the tangential direction of an elastic curve of the inner cable 15, so that nay buckling is avoidable within the elastic limit of the inner cable 15. In addition, since the inner cable 15 is oriented to the tangential direction of the elastic curve at the intermediate position by action of a protector 19, a buckling preventing action is yet more improved. On the basis of such a function, rotation of the crank arm 5 is smoothly convertible into reciprocating motion of the inner cable 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a linear rotational motion conversion mechanism for a push/pull control cable. More specifically, converting the reciprocating linear motion of the inner rope of the push-pull control cable into reciprocating rotational motion of the rotating shaft, or vice versa, converting the unidirectional or reciprocating rotational motion into reciprocating linear motion of the inner cable. The present invention relates to a mechanism that can be used for a wiper drive mechanism of an automobile, etc.

[Conventional technology]

Push/pull control cables provide a space advantage over pull control cables, which are typically used in sets of two, because only one cable can transmit forces in both directions. However, on the other hand, it requires a guide to prevent buckling, and has strict design conditions such as a large minimum radius of curvature, which limits its possible uses.

For example, Figs. 13 and 14 each show a conventionally known linear rotation conversion mechanism for a push/pull control cable. 52) directly to the lever (5
3=) and a rotating element such as a pinion (54). Therefore, those mechanisms usually have an inner cable (5
2) is connected to a rod (56) having approximately the same diameter as the inner cable that is slidably fitted into the guide vibe (55), and then the rod (5B) is connected to the lever (52) or the other member. A configuration in which it is connected to a rack (57) is adopted.

On the other hand, as a mechanism that utilizes the flexibility of the inner cable, the one shown in FIG. 15 is known. This thing is engaged with a rotatably provided drum (60) and an outer circumferential groove (61) formed on the outer periphery of the drum (60), and the end (62) is latched to the drum (60). It is composed of an inner cable (52) of the push/pull control cable and a casing (63) that is provided around the outer periphery of the drum (60) and guides the inner cable (52) by sliding thereon.

[The gap that the invention attempts to solve]

The mechanisms shown in Figures 13 and 14 include rods (56) and racks (57).
) and other rigid members are required, and the mechanism shown in FIG. 15 requires a large drum (60) due to the restriction on the bending radius of the inner cable (52). Further, the mechanism shown in FIG. 13 has a problem in that the rotation angle is limited and it can only be used for reciprocating rotation at a small angle. Furthermore, the mechanism shown in FIG. 14 requires a guide vibe (57a) for guiding the rack (57), which requires a larger space.

The present invention can be applied to, for example, an automobile wiper drive system, and is capable of transmitting data over a relatively large rotational angle range (360'' on the driving side, up to tso' on the driven side), and requires only a small space. The purpose of the present invention is to provide a mechanism for converting linear rotational motion of a push/pull control cable without any interference.

[Means for solving problems]

The push-pull control cable linear rotation motion conversion mechanism of the present invention includes: a crank rotatably supported at its base end; a connecting rod whose base end is connected to the free end of the crank with a pin; A slider attached to the free end of the connecting rod, and a guide for guiding the slider, which is provided to extend linearly on an extension of the axis of the conduit of the push-pull control cable, The distal end of the inner cable extending from the conduit of the push-pull control cable is fixed to the connecting rod in a state along the longitudinal direction of the connecting rod, or the distal end or a midway portion of the inner cable is in a state along the moving direction of the slider. A structural feature is that the slider is fixed to the slider.

[For production]

It is conventionally believed that the inner cable of a push-pull control cable must be guided over its entire circumference in order to transmit force along a curved path and to prevent buckling.

However, considered within a relatively short range, the inner cables can function as beams and bending beams that can also transmit shear forces and bending moments. For example, the rod (
In the case of a C tumor in the guide vibe (55) that guides the guide vibe (5B), the inner cord (52) is pulled out of the guide vibe (5B) due to excessive compressive force.
As can be seen from the fact that the inner cable always buckles when it comes into strong sliding contact with the inner wall of the guide vibe (55), the guide vibe (55) actually surrounds the inner cable (52). does not prevent buckling as a result of supporting the inner cable (52) from the outer periphery. That is, in normal compression action, one end of the inner cable is connected to the guide vibe (55) and the rod (5B).
The other end is connected to the exposed inner cable (
The directionality of the end of the inner cable (52) is ensured, thereby ensuring the directionality of the end of the inner cable (52).
2), the bending moment applied to the inner cable and the force perpendicular to the axis are supported, and an operating force is always applied in the axis direction of the inner cable. Therefore, the two forces and bending moments in different directions applied to both sides of the curved part of the inner cable (52), that is, the force and moment between the guide vibe (55) and the socket part (55a), affect the inner cable stiffening itself. It is balanced and communicated to each other through the inner cord (52
) buckling is also prevented due to the stiffness of the section between the rod and the conduit itself.

In the mechanism of the present invention, responsible for mutual conversion of linear rotational motion,
The tip or middle portion of the inner cable is fixed to a connecting rod or slider of the crank mechanism to maintain the aforementioned directionality of the inner cable. Therefore, in the mechanism of the present invention, unlike conventional mechanisms, rigid members such as telescopic rods and guide vibes are not particularly provided. Bending can be sufficiently prevented, and the size of the entire mechanism can therefore be made much smaller.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings. Although the following embodiments are all used in wiper drive devices, the mechanism of the present invention is not limited to such cases, and can be applied to any industrial machine (automobile) that uses a push/pull control cable. It can also be applied to all kinds of applications (such as accelerator controllers).

FIG. 1 is a front view showing an example of the drive section of a wiper drive device equipped with the mechanism of the present invention, and FIG.
11 is a cross-sectional view taken along line 11, FIG. 3 is a perspective view of the main parts of the drive section shown in FIG. 1, FIG. 5 is a sectional view taken along the line (V)-(V) in FIG. 4, FIG. 6 is a partially cutaway side view of the driven part shown in FIG. 4, and FIG. 7 is a main part of the driven part shown in FIG. 4. FIG. 8 is a partially cutaway front view showing an example of an intermediate driven part of a wiper drive device equipped with the mechanism of the present invention, FIG. 9 is a sectional view taken along the line ■-■ in FIG. 8, and FIG. FIG. 8 is a cross-sectional view taken along the flash line, FIG. 11 is a perspective view of a main part of the intermediate driven part shown in FIG. 8, and FIG. 12 is an example of a connected state of a wiper drive device using the mechanism of the present invention. It is a schematic front view.

In FIGS. 1 and 2, (1) is a bracket, and a drive shaft (2) is rotatably provided in a bearing part (la) of the bracket (1). Drive shaft (2 is a worm reducer (3)
) is rotationally driven by a motor (4) via a speed reducer such as.

Further, a crank arm (5) is fixed to the end of the drive shaft (2) so as to rotate together with the drive shaft (2).

As shown in FIG. 3, a guide member (7') having a guide groove (6) is fixed to the bracket (1), and a slider (8) slides in the guide groove (6). They are fitted freely.

The slider (8) and the crank arm (5) are connected to a socket rotatably connected to a ball member (9) fixed to the end of the crank arm (5), and the slider (8)
They are connected by a connecting rod (2) having a hole (a1) formed in the hole a1) and a pin side that is rotatably connected.

At the end of the connecting rod (2) on the socket side, that is, near the base end, there is a recessed opening for fixing a locking member (G) fixed to the end of the inner cable of the push/pull control cable 04). is formed, whereby the end of the inner cable G is fixed along the longitudinal direction of the connecting rod.

The concave groove 08 extending from the four-part opening in the longitudinal direction of the connecting rod 0 is a space for accommodating the inner cable G while allowing it to swing within a certain angular range.

With the above configuration, the mechanism for converting the rotation of the crank arm (5) into a push/pull motion of the inner cable can be changed. However, in the drive unit (Kl) shown in FIGS. 1 to 3, since the crank arm (5) is rotated once, the required stroke is long and the exposed portion of the inner cable 4 is long.

Therefore, a protector (
) is provided between the connecting rod 03 and the slider (8) on an elastic curve due to bending of the inner cable.

That is, a notch step (2D) is formed on the free end side of the connecting rod (+31), and a pin (2D) is provided on the notch step (2). The other end of the protector Oc1 is fitted with an elongated hole formed in the slider (8) to rotatably connect the protector 09 and the connecting rod n. A matching pin Q4 is provided protrudingly.

The parts other than the center part □□□ of the protector (to) have a width that is the same as the diameter of the inner cable near the center, and a width at an angle of about 30" toward the end of the protector (to). Expanding concave grooves (2) and - are formed.Furthermore, a hole with the same diameter as the inner cable is formed in the longitudinal direction of the protector (to) in the central part, and the concave grooves (2) and (2) communicate with each other. are doing.

At the end of the bracket (1), the end of the conduit 4 of the push/pull control cable is attached with a fixing tool ■ and a screw (31).
It is fixed so as to be concentric with the guide groove (6).

In other words, the inner cable 6 coming out of the conduit (end) extends concentrically with the guide groove (6) without any guide, is loosely guided by the concave groove of the protector, and then extends into the center prisoner. The direction is once determined by the hole ■. Furthermore, the inner cable passes through the concave groove (to) of the protector (to) and the concave groove (to) of the connecting rod n, and its end is fixed by the four parts (goods) of the connecting rod ■, so that its direction is the longitudinal direction of the connecting rod n. stipulated in

Next, the operation of the drive section (K1) which is constructed in a diagonal manner will be explained.

When the motor (4) rotates, its rotational motion is decelerated by the worm reducer (3), causing the crank arm (S) to rotate in one direction.The rotation of the crank arm (5) further causes the connecting rod (2) and the slider (8 ) and guide groove (
6) is converted into a linear reciprocating motion.

Therefore, the inner cable ring whose tip end locking member Oe is fixed to the connecting rod ring also reciprocates in its axial direction. Note that the longitudinal force of the connecting rod 03 transmitted from the crank arm (5) to the connecting rod n is partially transmitted to the guide groove OG via the slider (8), and mostly transmitted to the inner cable 4. . On the other hand, the other end of the inner cable 6 receives a pressing reaction force from the driven part side, and also receives a reaction force from the protector (hole and concave groove in the central part of Ic1), which balances the force inside the inner cable 6. are doing.

In the course of such movement, if the slider (8) moves in the direction of arrow (A), tension is applied to the inner cable 6, so there is no audible movement. However, when the slider (8) moves in the direction of arrow (B), that is, when the crank arm (5) rotates in the direction of arrow (D), for example from bottom dead center (C1) to top dead center (C2), Since compressive forces are applied to the cables, buckling becomes a problem.

In the mechanism shown in Fig. 1, the end of the inner rope is always forcibly oriented in the longitudinal direction of the connecting rod 03, that is, in the direction in which force is transmitted, and even at the part of the fixing device (■), it is directed in the direction of the conduit 4. It is directed towards. Therefore, the direction of the compressive force is always directed in the direction of the elastic curve of the inner cable η, so that buckling is avoided within the elastic limit of the inner cable color.

Furthermore, in the mechanism shown in FIG. 1, the direction of the inner cable color is determined in the tangential direction of the elastic curve of the inner cable at the intermediate position due to the action of the protector a9 described above, so that the - layer buckling prevention effect is determined. It's improving.

Based on the above functions, the rotational movement of the crank arm (5) is smoothly converted into a reciprocating movement of the inner cable, and buckling of the inner cable is also prevented.

The device shown in Figures 1 to 3 rotates the crank arm to convert the linear reciprocating motion of the inner cable, but it is also used to convert the linear reciprocating motion of the inner cable into the reciprocating rotational motion of the crank arm. You can also.

The device shown in FIGS. 4 to 7 is an example of such a case, and the device moves straight and back in the direction of the inner color arrows (A) and (B) obtained by the drive unit shown in FIGS. 1 to 3. A driven part (K2) is shown for converting the movement into a reciprocating rotational movement of the wiper in the directions of arrows (E)-(P).

In this case, the wiper drive shaft makes a reciprocating rotation of about 90", and because the drive shaft can be eccentric from the extension line of the guide groove, the swing angle of the connecting rod is small (about 80 degrees). , therefore, it has substantially the same configuration as the drive section of FIGS. 1 to 3, except that the protector is not provided.

That is, the bearing part (la) of the bracket (1) is the drive shaft (2) to which the crank arm (5) is fixed to the shaft end.
A slider (8) is slidably housed in a guide groove (6) formed in a guide member (7) fixed to the bracket (1). Further, a connecting rod 0 is interposed between the slider (8) and the crank arm (5), and the connecting rod 0 is connected at both ends by a ball member (9), a socket (goods), and a pin 02) and a hole 01), respectively. There is.

Locking member a fixed to the tip of the inner cable 6 on the connecting rod day
A recess opening is formed to accommodate e, and the inner cable color is recess 0.
7), and the direction is determined again by the conduit (to) which is guided along the longitudinal direction of the connecting rod n and is arranged concentrically with the guide groove (6).

Therefore, the exposed portion of the inner wire is balanced in a bent state by receiving the bending moment from the connecting rod and from the drive unit side, and is pushed and pulled in this state.

As shown in FIGS. 6 and 7, tapered serrations (2a) are formed at the end of the drive shaft (2) to securely attach the base (not shown) of the wiper arm.

When the inner cable is pushed or pulled in the direction of arrows (A) and (B) in the mechanism shown in Fig. 4, the drive shaft is (2) performs reciprocating rotational movement in the directions of arrows (D)-(E) to swing the wiper.

Next, with reference to FIGS. 8 to 11, aspects of the mechanism of the present invention that are different from those of the drive section shown in FIG. 1 and the driven section shown in FIG. 4 will be explained.

The device indicated by the symbol (K3) in Fig. 8 is an intermediate driven part interposed between the driving part (K1) in Fig. 1 and the driven part (K2) in Fig. 4, and as shown in Fig. 12. By being connected, the reciprocating linear movement of the inner cable 6 is controlled by the wiper drive shaft (2
) to convert it into reciprocating rotational motion.

The intermediate driven part (K3) is similar to the driven part (K2) in Fig. 4, and is composed of a drive shaft (2), a crank arm (5), and a connecting rod with a slider (8).
It is equipped with However, since the end of the inner cable 6 cannot be used, the inner cable G is a pipe integrally formed with a guide member (a slider (8) guided by a force guide groove (6)) as shown in FIG. It is caulked to the part (8a), thereby fixing the direction of the inner cable.

In this case, when the inner cable is driven in the direction of arrows (A) and (B), the crank arm (5) moves through the slider (8) and the connecting rod (2) at an angle of about 120° (arrow (D)).
The wiper arm (not shown) is rotated reciprocatingly in the direction (E) and swung through the drive shaft (2).

Of the reaction force generated in the axial direction of the connecting rod n, the component force in the direction perpendicular to the inner cable 6 is supported by the guide groove (6) through the slider (8), and the component force in the axial direction of the inner cable 6 and the driven The reaction force transmitted from the part (K2) side becomes the compressive force applied to the inner cable 6.

[Effect of the invention] In the mechanism of the present invention, the direction of the fixed part of the inner cable is specified,
Since buckling is prevented by supporting the moments at both ends of the exposed portion of the inner cable, a portion of the inner cable can be pushed and pulled as is without a guide.

Therefore, it is possible to smoothly convert reciprocating rotational motion in a relatively large angular range or between unidirectional rotational motion and reciprocating linear motion, and has the advantage that the entire device equipped with the mechanism can be configured small. .

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of the drive section of a wiper drive device equipped with the mechanism of the present invention, and FIG.
II) A line sectional view, FIG. 3 is a perspective view of the main part of the drive section shown in FIG. 1, FIG. 4 is a partially cutaway front view showing an example of the driven section of the wiper drive device equipped with the mechanism of the present invention, 5 is a sectional view taken along line (V)-(V) in FIG. 4, FIG. 6 is a partially cutaway side view of the driven part shown in FIG. 4, and FIG. 7 is a main part of the driven part shown in FIG. 4. FIG. 8 is a partially cutaway front view showing an example of an intermediate driven portion of a wiper drive device equipped with the mechanism of the present invention; FIG.
The figure is a sectional view taken along the line ■-■ in Figure 8, and Figure 10 is the (X
)-(X) line sectional view, FIG. 11 is a perspective view of the main part of the intermediate driven part shown in FIG. 8, and FIG. 12 is a schematic front view showing an example of a connected state of the wiper drive device using the mechanism of the present invention. Figure, 1st
3 to 15 are explanatory diagrams showing examples of conventional linear rotation conversion mechanisms, respectively. (Main symbols in the drawing) (2): Drive shaft (5): Crank arm (6) Ni guide groove (8) Varnish slider (131: Connecting rod 04): Push/pull control cable G: Inner cable Patent applicant Nippon Cable System Co., Ltd. Company] 6 years old 14 figure g'752

Claims (1)

[Scope of Claims] 1. A crank rotatably supported at its base end; a connecting rod whose base end is connected to the free end of the crank by a pin; and a connecting rod attached to the free end of the connecting rod. and a guide for guiding the slider, which is provided so as to extend linearly on an extension of the axis of the conduit of the push-pull control cable, and a guide for guiding the slider. A linear rotation motion conversion mechanism for a push/pull control cable, in which the tip of an inner cable extending from the connecting rod is fixed to the connecting rod in a state along the longitudinal direction of the connecting rod. 2. The connecting rod has a protector, one end of which is rotatably supported in the longitudinally intermediate portion of the connecting rod, and the other end of which is connected to the slider with some play in the direction of movement of the slider, and the protector is connected to the inner cable. The mechanism according to claim 1, wherein the intermediate portion is held in a state along its longitudinal direction. 3. The mechanism according to claim 1, wherein the crank is an input means and the inner cable is an output means. 4. The mechanism according to claim 1, wherein the inner cable is an input means and the crank is an output means. 5. The mechanism according to claim 3, wherein the crank is connected to a wiper drive motor. 6. The mechanism according to claim 4, wherein the crank is connected to a wiper drive arm. 7 a crank rotatably supported at its base end; a connecting rod whose base end is connected with a pin to the free end of the crank; and a slider connected with a pin to the free end of the connecting rod; a guide for guiding the slider, which is provided to extend linearly on an extension of the axis of the conduit of the push-pull control cable; A push/pull control cable linear rotation motion converting mechanism in which the push/pull control cable is fixed to the slider in a state along the moving direction of the slider. 8. The mechanism according to claim 7, wherein the inner cable is an input means and the crank is an output means.