JPH02113316A - Positioning device for operation lever - Google Patents

Abstract

PURPOSE:To prevent the operation lever from shifting in position without any increase in the operating force of the operation lever by providing a rotary member with an elastic body which is coupled to support the operation lever so that the lever can slant relatively in the rotating direction of the rotary member only at a prescribed angle. CONSTITUTION:When the operation lever 1 is not operated, ratchet hooks 8-13 of the rotary member 4 which are coupled to support the operation lever 1 through the elastic body 6 are energized by an energizing means to rotate, and claw parts 8a-13a of the tip of the hooks are engaged with the engaging tooth part 3a on the outer periphery of a ratchet gear 3. When the lever 1 is put in switching operation, the ratchet hooks behind the rotary member 4 in the rotating direction are rotated against the energizing force of the energizing means by the relative slanting displacement between the operation lever 1 and rotary member 4 accompanying the deformation of the elastic body 6 to disengage the tip claw parts from the engaging tooth part of the ratchet gear. Consequently, the operation lever is securely prevented from returning when loaded without causing any increase in the operating force of the operation lever.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a positioning device for positioning and holding an operating lever in a predetermined position.

(Prior Art) Conventionally, variable pulley type continuously variable transmissions using belt transmission have been widely used in, for example, agricultural machinery and the like. This variable pulley type continuously variable transmission is
For example, as disclosed in Japanese Unexamined Patent Publication No. 62-118159, each of a pair of input/output shafts arranged parallel to each other is provided with a rotationally integral and non-slidable structure with respect to each of the input/output shafts. A variable pulley consisting of a fixed shave and a movable shave that is rotatably and slidably supported on each axis so as to face each other so as to form a V-shaped belt groove between the fixed shaves. At the same time, a belt member is wound between the belt grooves of both of the variable boots, and the movable sheave of each variable boob is moved in the axial direction to approach and separate from the fixed sheave, and the belt member is wound around the belt groove between the two sheave. By making the effective radius of the belt member variable, the speed ratio between the input and output shafts can be changed.

By the way, in this type of continuously variable transmission, the gear ratio between the input and output shafts is switched by a gear shift operation of an operating lever. However, when a load is applied from the transmission, this operating lever tends to return the gear ratio of the input/output shaft of the transmission to a lower speed side. Therefore, in order to keep the gear ratio constant and stable, it is necessary to use a positioning device to immovably position the operating lever at a predetermined position.

As such a positioning device, a detent type is conventionally well known. That is, as shown in FIG. 3, this device is rotatably fixed to a rotatable operation lever a, and has a plurality of engaging teeth on the outer circumference of the rotary end.
. . . A fan-shaped daytent b, which is rotatably supported at a position apart from the center of rotation of the daytent b, and has an engaging tooth portion bI r b+ of the daytent b at the rotation end.
+..., a stopper link d having a stopper pin C that can be engaged with the stopper link d, and the stopper pin C of the stopper link d is connected to the engaging teeth portions bl, b1 . When the operating lever a is rotated together with the day tent b to the desired operating position, the stopper pin C of the stopper link d is attached by the spring e. By forcefully engaging one of the engaging tooth portions bl r b+ a . . . of the detent b, the operating lever a is fixedly held at its rotational position. Note that f is a link that is drivingly connected to the transmission.

(Problem to be Solved by the Invention) However, in this conventional device, in order to reliably prevent movement of the operating lever a when a load is applied, the spring force of the spring e must be increased to prevent the stopper pin C and the day tent from moving. It is necessary to ensure engagement with the tooth portion b1 of b. However, in that case, on the other hand, when switching the operating lever a, the stopper pin e is moved against the increased biasing force of the spring e to engage the engaging teeth bl, b1. . . . must be overcome, and it is undeniable that the switching operation force of the operating lever a increases.

The present invention has been made in view of the above points, and an object of the present invention is to improve the position of the operating lever when a load is applied, without increasing the operating force of the operating lever, in the operating lever positioning device as described above. The aim is to reliably prevent misalignment.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a positioning system for determining the operating position of an operating lever that is rotatably operated to switch a device to be switched such as a variable pulley type continuously variable transmission. As the device, (1) First, a rotating member is provided, which is rotatably supported by a fixed body in the front-rear direction and is drivingly connected to the device to be switched.

(2) Further, an elastic body is provided to connect and support the operating lever to the rotating member so that it can be tilted relative to it by a predetermined angle along the rotating direction of the rotating member.

■Furthermore, a circle is fixed to the fixed body and has a plurality of engagement teeth formed on the outer periphery symmetrically with respect to the center position of the rotation range of the rotation member and centered on the rotation center of the rotation member. An arc-shaped ratchet gear is provided.

■ Also, the rotary member is rotatably supported by the rotary member, and extends in pairs in the direction of rotation of the operating lever, and has a distal end that corresponds to the rotation range of the rotary member relative to the engagement teeth of the ratchet gear. A ratchet hook having a claw portion that can be engaged only in the direction toward the center is provided.

(2) A biasing means is provided for biasing the ratchet hook so that the distal end claw engages with the engagement teeth of the ratchet gear.

■Furthermore, the ratchet hook is fixed to the operating lever, and as the operating lever rotates, the distal end claw of the ratchet hook on the rear side of the operating lever is disengaged from the engagement teeth of the ratchet gear. An engagement release means is provided which is rotated against the urging force of the urging means.

In addition, in order to stop the operating lever at any position and position the operating lever steplessly, a plurality of pairs of ratchet hooks are provided, and a plurality of ratchet hooks are provided on each side of the rotation direction of the rotating member. The length from the rotation center to the tip claw is 1 of the engaging teeth of the ratchet gear.
The lengths should be different within the pitch range.

(Function) With the above configuration, in the present invention, when the operating lever is not switched, the distal end claws of the pair of ratchet hooks supported by the rotating member are connected to the operating lever among the engagement teeth on the outer periphery of the ratchet gear. A pair of ratchet hooks and a ratchet gear are engaged with each other symmetrically with respect to the position, and the operation lever is positioned by the engagement between the ratchet hook and the ratchet gear. At this time, the tip of the ratchet hook is biased by the biasing means so that it engages with the locking part of the ratchet gear, so the claw and the locking part are reliably engaged and the rotation The member is held unrotatable. Therefore, even if a large load is applied from the switched device connected to the rotating member, the rotating member will not rotate, and the operating lever will not deviate from the intended switching position.

On the other hand, when switching the device to be switched, the operating lever is rotated to switch to the desired switching position. As the operating lever is rotated, the elastic body interposed between the operating lever and the rotating member is initially deformed, and due to this deformation, only the operating lever is moved by a predetermined angle to the rotating member. It tilts relative to the other hand. Since the above operation lever has an engagement release means fixed to a rotating body, the engagement release means is tilted by the relative tilting of this operation lever, and this engagement release means causes the operation lever to move backward in the rotational direction. The ratchet hook is rotated against the biasing force of the biasing means, and the engagement between the claw portion at the tip of the ratchet hook and the engagement tooth portion of the ratchet gear is released. In this disengaged state, the rotating member can rotate, so if the operating lever is further rotated, the rotating member will follow the movement of the operating lever and rotate. The device to be switched can be switched by rotating the member. At that time, it is only necessary to disengage the ratchet hook and the ratchet gear against the biasing force of the biasing means, and then only the device to be switched is switched, so that the switching operation force can be reduced. Can be done.

Then, when the rotation of the operating lever is stopped at the desired switching position, the rotation of the ratchet hook by the engagement release means is stopped, and the pawl of the ratchet hook and the engagement teeth of the ratchet gear are again disengaged. This causes the operating lever to be positioned at the desired position.

In addition, a plurality of pairs of the ratchet hooks are provided, and the length of the plurality of ratchet hooks on each side of the rotation direction of the rotation member from the rotation center to the tip claw portion is one of the engagement tooth portions of the ratchet gear. If the pitches are different from each other within the range, when the operating lever is not operated, at least one of the plurality of ratchet hooks will engage with the engagement teeth of the ratchet gear, so the length of the plurality of ratchet hooks will be different. The number of stopping positions of the operating lever increases by the difference in height, so that the operating lever can be stopped at any position and the operating lever can be positioned steplessly.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes an operating lever for changing speed of a variable boolean continuously variable transmission (not shown) as a device to be switched. A cylindrical portion 1a extending in a direction perpendicular to the rotation operation direction (left-right direction in FIG. 1) is integrally formed.

Further, reference numeral 4 denotes a rotating member that is supported by a fixed body (not shown) such as a case via a support shaft 2 so as to be rotatable in the front and back direction. It has a plate part 4a extending along the direction, and the plate part 4a has a pair of front and rear connecting parts 4b formed by bending both ends of the intermediate cylindrical part 1a of the operating lever 1 with a predetermined gap between them. , 4b are formed, and a bolt insertion hole 5 is opened in each connecting portion 4b. Moreover, the said connecting part 4b.

4b and both ends of the cylindrical portion 1a of the operating lever 1 are each filled with a cylindrical elastic body 6.6 made of compressed rubber. The connecting parts 4b, 4b of the rotating member 4 and the cylindrical part 1a of the operating lever 1 are connected to the bolt insertion hole 5 of each connecting part 4b, each elastic body 6, and the operating lever 1.
The connecting bolts 7 inserted through the cylindrical portions 1a connect the elastic bodies 6 so that they can be relatively displaced by the compressive deformation of each elastic body 6.

Although not shown, the lower end of the operating lever 1 is elastically supported by a pair of front and rear elastic bodies made of compressed rubber with respect to the rotating member 4, so that the operating lever 1 can be rotated back and forth around the support shaft 2. When operated, the operating lever 1 is tilted relative to the rotating member 4 by a predetermined angle due to compressive deformation of the upper elastic body 6 on the front side in the rotation direction and the lower elastic body on the rear side in the rotation direction. It is done like this.

On the other hand, the lower half of the rotating member 4 has mounting holes 4c, 4c for mounting a connecting member (not shown) such as a link linked to the switching drive section of the transmission.

... is formed.

The fixed body has an arc shape with the support shaft 2 as the center of the arc (
A fan-shaped ratchet gear 3 is fixed. The ratchet gear 3 has a plurality of engagement teeth 3a on the outer circumferential arc portion.
3a, . . . are divided into a front side (left side in FIG. 1) and a rear side (right side in FIG. 1), and are formed symmetrically in the front-rear direction with respect to the center position C of the rotation range of the rotation member 4.

Furthermore, six ratchet hooks 8 to 13 each having a substantially circular arc plate shape are rotatably supported on the plate portion 4a of the rotary member 4 by a support shaft 14. These six ratchet hooks 8 to 13 extend in three pairs in the direction of rotation of the operating lever 1, each having engagement teeth 3a, 3a of the ratchet gear 3 at their tips.・Rotating member 4
A claw portion 8 that can be engaged in a direction toward the center position C of the rotation range.
a to 13a are formed. The three ratchet hooks 8 to 10 (or 11 to 13) on each side of the rotation direction of the operating lever 1 extend from the rotation center to the tip claws 8a to 10a (or lla to 13a). Each engagement tooth portion 4a of the ratchet gear 3 has a length Ω1 to g3,
They differ from each other within one pitch of 4b.

Furthermore, three pairs of ratchet hooks 8 corresponding to the front and rear
A tension spring 15 serving as a biasing means for rotationally biasing the ratchet hooks 8 to 13 is provided between the intermediate portions of the ratchet hooks 8 to 13.
15. ... (only one is shown) is passed through the hooks, and these springs 15, 15, ... hold the ratchet hooks 8 to 13 on the front ratchet hooks 8 to 10 in the opposite direction as shown in Figure 1. The ratchet hooks 11 to 13 on the rear side are biased to rotate around the support shaft 14 in the same clockwise direction, so that the tip claws 8a to 13a are connected to the ratchet gear 3. engaging tooth portion 3a,
3a, . . .

In addition, ratchet hooks 8 to 10 (or 11 to 10) on the rear side in the rotational direction of the operating lever 1 are provided in the middle part of the operating lever 1.
13) A pair of front and rear hook push-up rods 16a serve as engagement release means for rotating the springs 15, 15, . . . against the biasing force.

16b are integrally fixed. These hook push-up rods 16a, 16b extend from the middle part of the operating lever 1 in the front-rear direction in parallel with the plate part 4a, and their tips are bent in a direction parallel to the support shaft 2 to below each ratchet hook 8-13. As the operating lever 1 rotates, the tips of the hook push-up rods 16a and 16b push the ratchet hooks 8 to 10 (or 1) on the rear side in the rotating direction of the operating lever 1.
1 to 13) to the tip claw parts 8a to 10a (or 11a to 13)
a) is the engaging tooth portion 3a, 3a, . . . of the ratchet gear 3;
The springs 15, 15 are disengaged from each other.
．． It is made to rotate against the urging force of... As described above, the positioning device A is configured to determine the operating position of the operating lever 1 that is rotated to switch the transmission.

Next, the operation of the above embodiment will be explained.

When the control lever 1 is not operated to change the continuously variable transmission, the claws 8a to 13a at the tips of the three front and rear ratchet footers 8 to 13 supported by the rotating member 4 engage the outer periphery of the ratchet gear 3. Engagement tooth portion 3a.

3a, . . . engages with a pair of engagement tooth portions 3a, 3a that are symmetrical in the front and back relative to the switching position of the rotating member 4. That is, when the rotating member 4 tries to rotate forward, it is caused by the claws 11a to 13 of the rear ratchet hooks 11 to 13.
a and the engagement teeth 3a of the ratchet gear 3, and when the rotating member 4 attempts to rotate rearward,
It is regulated by the engagement between the claws 8a to 10a of the front ratchet footers 8 to 10 and the engagement teeth 3a of the ratchet gear 3, and the operation lever 1 is positioned by the engagement between the ratchet hooks 8 to 13 and the ratchet gear 3. be done.

At that time, the ratchet hooks 8 to 13 are connected to the spring 15,
15. Because the distal end claws 8a to 13a are urged to engage with the engagement teeth 3a, 3a of the ratchet gear 3, the claws 8a to 13a and the engagement teeth 3a
, 3a are reliably engaged, and the rotating member 4 is held unrotatable in the front-rear direction. Therefore, even if a large load is applied to the rotating member 4 from the transmission due to a change in the speed change state of the continuously variable transmission drivingly connected to the lower half of the rotating member 4 due to a disturbance, the rotating member 4 does not rotate, and therefore the operating lever 1 (transmission) can be reliably held at a predetermined switching position.

When changing the gear ratio of the transmission from this state, the operating lever 1 is rotated forward or backward to switch to the desired switching position. Since an elastic body 6°6 is interposed between the operating lever 1 and the rotating member 4, as the operating lever 1 rotates, the upper side of the operating lever 1 initially moves in the rotating direction. The elastic body 6 located on the front side and the elastic body on the rear side in the rotation direction on the lower side are compressed and deformed, and this elastic body 6
Due to this deformation, only the operating lever 1 is tilted and displaced by a predetermined angle relative to the cooperating member 4. Due to the relative tilting displacement of the operating lever 1 with respect to the rotating member 4, the hook push-up rod 16a is rotationally fixed to the operating lever 1.
, 16b are tilted with respect to the rotating member 4, and the three ratchet hooks 11 to 13 (or 8
~10) are all the above springs 15, 15. ... is pushed up against the urging force of..., and the claw portion 11 at the tip of each
The engagement between a to 13a (or 8a to 10a) and the engagement tooth portion 3a of the ratchet gear 3 is released, and the rotation member 4 becomes rotatable due to this disengagement.

The ratchet hooks 8 to 10 (or 11 to 13) on the front side in the rotation direction restrict the rotation of the rotation member 4 in the rearward direction, but do not restrict the rotation in the forward direction.
When the operating lever 1 is roughly rotated in the disengaged state, the rotating member 4 follows the rotation of the operating lever 1 due to the compression limit of the compressed elastic body 6 in the same direction. The rotation of the rotating member 4 switches the gear ratio of the transmission.

When switching the operating lever 1, the springs 15, 15. The ratchet hooks 11 to 13 (or 8 to 10) and the ratchet gear 3 resist the urging force of...
Since it is only necessary to release the engagement with the transmission lever 1, and then only the gear change of the transmission is performed, the operating lever 1 can be operated with a relatively small operating force.

After this, when the operating lever 1 is stopped rotating at the desired switching position, the elastic body 6 in the compressed state returns to its original state, and the relative tilting displacement between the operating lever 1 and the rotating member 4 is reduced. The above hook push-up rod 16b (or 16b)
The ratchet hooks 11 to 13 (or 8 to 10) are tilted back, and the claws 11a to 13a (or 8a to 1
0a) and the engaging tooth portion 3a of the ratchet gear 3 are engaged again, and thereby the operating lever 1 is positioned at the desired position.

In the case of this embodiment, the ratchet books 8 to 13 are arranged in three pairs, front and rear, and the three ratchet hooks 8 to 10 (or 11 to 13) on each side in the direction of one rotation of the operating lever are set at the center of rotation. Tip claw portions 8a to 10a (or lla to
13a) are set to different lengths from each other within the range of one pitch of each engaging tooth portion 3a of the ratchet gear 3, so when the operating lever 1 is not operated, the three teeth Ratchet hooks 8 to 10 (or 11 to 13)
Either one of them will engage with the engagement tooth portion 3a of the ratchet gear 3. Therefore, the stopping position of the operating lever 1 can be increased step by step by the difference in length between the three ratchet hooks 8 to 10 (or 1l-13), and therefore the operating lever 1 can be stopped at any position. The operating lever 1 can be positioned steplessly.

In the above embodiment, the elastic bodies 6, 6 interposed between the operating lever 1 and the rotating member 4 are made of compressed rubber, but it is also possible to use a spring. However, from the viewpoint of being inexpensive and easy to install, it is preferable to use compressed rubber as in the above embodiment.

Furthermore, it goes without saying that the present invention can also be applied to switching operations of devices other than continuously variable transmissions.

(Effects of the Invention) As described above, according to the operating lever positioning device of the present invention, when the operating lever is not operated, the ratchet hook of the rotating member that connects and supports the operating lever via the elastic body is rotated by the urging means. The pawl at the tip engages the engagement teeth on the outer periphery of the ratchet gear, and during the switching operation, the relative tilting displacement between the operating lever and the rotating member due to the deformation of the elastic body causes The ratchet hook on the rear side in the rotational direction of the rotating member is rotated against the urging force of the urging means to release the engagement between the tip claw portion and the engagement tooth portion of the ratchet gear. Therefore, it is possible to reliably prevent the operating lever from returning when a load is applied, without increasing the operating force of the operating lever in the positioning device.

In addition, a plurality of pairs of the above ratchet hooks are used, and the length from the center of rotation of the plurality of ratchet hooks on each side in the rotational direction of the operation lever to the tip claw is within one pitch of the engagement southern part of the ratchet gear. If they are different from each other, the number of stopping positions of the operating lever will increase by the difference in the length of the plurality of ratchet gears, so the operating lever can be stopped at any position and the operating lever can be positioned steplessly. The position can be adjusted.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a plan view thereof. FIG. 3 is a front view showing a conventional example. A...Positioning device, 1...Operation lever, 3...
Ratchet gear, 3a... Engaging tooth portion, 4... Rotating member, 6... Elastic body, 8-13... Ratchet hook, 8a-13a... Claw portion, 15... Spring (biasing means), 16a, 16b... hook push-up rod (
(disengagement release means), g1 to Ω3...Length from the center of rotation of the ratchet hook to the tip claw. Figure 2

Claims (2)

[Claims] (1) A positioning device that determines the operation position of a control lever that is rotated to switch a device to be switched such as a variable pulley type continuously variable transmission, and is supported by a fixed body so as to be rotatable in the front and back direction. , a rotating member drivingly connected to the switching device; an elastic body that connects and supports the operating lever to the rotating member such that it can be tilted relative to the rotating member by a predetermined angle; and a fixed body. an arcuate ratchet gear fixed to the rotary member, having a plurality of engagement teeth formed symmetrically with respect to the center position of the rotary range of the rotary member on its outer periphery and having a plurality of engagement teeth centered on the rotation center of the rotary member; Rotatably supported by the rotating member, and extending in pairs in the rotational direction of the operating lever,
A ratchet hook has a claw portion at its tip that can engage the engagement tooth portion of the ratchet gear only in the direction toward the center of the rotation range of the rotating member; and a biasing means that is fixed to the operating lever so that the distal end claw engages a ratchet hook on the rear side in the rotational direction of the operating lever as the operating lever rotates. 1. An operating lever positioning device comprising: an engagement release means that is rotated against the biasing force of the biasing means so as to be disengaged from the engagement tooth portion of the operating lever. (2) A plurality of pairs of ratchet hooks are provided, and the length of the plurality of ratchet hooks on each side of the rotation direction of the rotation member from the rotation center to the tip claw portion is the engagement tooth of the ratchet gear. The operating lever positioning device according to claim 1, wherein the operating levers are different from each other within a range of one pitch.