JPH02229947A - Accel actuator and assembly method thereof - Google Patents

Abstract

PURPOSE:To facilitate high-precise regulation by providing a housing, a motor mounted to the housing, a reduction gear coupled to the motor and having a self-constraining function, and a sun gear mounted on an output shaft. CONSTITUTION:Since a rotation angle detector, e.g. a potensiometer P, is coupled to an output shaft 9 of a gear reduction 2 rotated in an angle range higher than those of an engine pulley and a pulley 4 of an actuator, resolution is high. The pulley 4 is rotatably mounted on a housing 1, and a plate 23 and a rotation angle detector P are mounted to the housing 1 around respective axes in a manner to allow regulation of an angle. Thereby, after an output shaft 9 of the gear reduction 2 and the pulley 4 are positioned, the output shaft and the pulley are intercoupled through a planetary gear 22, resulting in facilitation of a regulating work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an accelerator actuator (hereinafter referred to as an actuator) and a method for assembling the same. More specifically, the present invention relates to an actuator for remotely controlling the accelerator of an engine of an automobile, construction machine, etc., and a method of assembling the actuator.

[Conventional technology] Traditionally, engines (
Actuators for accelerator control are used to remotely control the accelerator of diesel engines (particularly diesel engines) and for constant-speed automatic operation.

As shown in Figure 8, this device measures the rotation angle of an engine pulley (5l) attached to the engine side governor using a rotation angle detector such as a potentiometer (Pl) (hereinafter, the potentiometer will be explained as a representative). The rotation angle signal is compared with the instruction signal from the operating device (or rotation speed setting device) in the controller (c), and then the motor (M) of the actuator (52) is detected in order to eliminate the deviation.
is giving feedback.

[Problem to be solved by the invention] A potentiometer (P) is installed near the engine pulley (5I).
If 1) is installed, the life of the potentiometer will be shortened due to vibration, etc. Further, if a separate governor opening detection mechanism is provided near the actuator (52), there is a problem that the structure is complicated and the device becomes large.

In order to solve this problem, it is conceivable to provide a potentiometer (P2) inside the actuator (52), as shown by the imaginary line in FIG. There is a problem in that the operating ranges of the engine pulley (51) and the actuator output pulley (55) do not correspond accurately due to the accumulation of errors in connection and assembly of the engine pulley (54).

In particular, since the output of the potentiometer of construction machinery is used to control the discharge amount of a hydraulic bomb (for example, to control the angle of the swash plate of a swash plate bomb), the correspondence between the potentiometer angle and the governor opening should be as accurate as possible. There is a need,
The above issue is important.

In addition, the pulley (55) of the actuator (52) is normally provided with a stopper and a limit switch (LSI), (LS2) at its rotating end to protect the motor. It is also necessary to accurately match the rotation range and the movable range of the engine pulley (51).

The positions of each of the above parts are adjusted based on the full throttle position of the engine pulley (5L), the position of the conduit connection of the control cable <53L (54), the position of the boot 9 (55), and the button position. Since it is necessary to trace back the angle of the meter (P2) and the output shaft, the assembly work becomes extremely complicated.

In addition, as a way to reduce such adjustment work, for example, a stepping motor is used as the actuator motor (M), and the output pulley (55) is not stopped mechanically with a stopper, but the stop is memorized in the microcomputer in the controller after the fact. There have also been proposals that omit the limit switch by electrically stopping the motor based on the position. However, this system has the problem that it does not function adequately as a fail-safe mechanism when trouble occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide an actuator with a built-in potentiometer that reduces the complexity of adjusting each part of the actuator and allows easy, highly accurate adjustment by following certain steps.

A further object of the invention is to provide a method of assembling an actuator that requires as little adjustment as possible when connecting such an actuator to an engine pulley.

[Means for Solving the Problems] The accelerator actuator of the present invention includes an <ω housing, (b) a motor attached to the housing, and (c
) a reduction gear with a self-locking function connected to the motor; a sun gear provided on the output shaft of the reduction gear;
el a rotation angle detector having a detection shaft concentrically connected to the output shaft of the speed reducer, and <f> mounting the rotation angle detector to the housing so that the angle around the detection axis can be adjusted; (9) a planetary gear disposed around the sun gear of the reduction gear; a plate fixed so as to be adjustable; a pulley having an internal gear mating with the planetary gear and rotatable about the axis of the output shaft with respect to the housing; It consists of inner cables whose ends are locked to the pulleys and are wound in opposite directions, and two control cables that are connected to the other end of each inner cable or to the engine pulley. be done.

Such an actuator includes mounting means for locking the conduit of the control cable so as to be able to move in the axial direction relative to the housing and to restrict the position farthest from the housing, and a means for locking the conduit so as to keep the conduit away from the housing at all times. It is preferable to provide a loose spring that biases the spring.

Furthermore, the method for assembling an actuator of the present invention is the method for assembling the 7-cell actuator described above, which includes (a) the step of installing the reducer in the housing, and (2) the step of installing the speed reducer in the housing; (c) adjusting the attachment position of the accelerator control cable to the nozzling of the conduit, and positioning the pin of the pulley at a predetermined angular position with respect to the output shaft of the reducer; (d) meshing the planetary gear between the pulley and the output shaft and attaching the plate to the housing; (e) attaching the rotation angle detector to the output shaft; +f+pulley full range and adjusting the mounting angle of the rotation angle detector so that the rotation angle detector is within a predetermined range at the position.

[Function] The acticoator of the present invention has a longer lifespan for rotation angle detectors such as potentiometers, and furthermore, the rotation angle detector is capable of increasing the output of a reducer that rotates in a larger angular range than the engine pulley or actuator pulley. Since it is connected to the shaft, the resolution is high.

In addition, the pulley is rotatably provided on the housing, and the plate and rotation angle detector are each attached to the housing so that their angles can be adjusted around their own axes. Connect the two with gears. Therefore, adjustment work is easy.

Furthermore, in a case where the end of the conduit is attached to the housing via a loose spring, even if the pulley is driven beyond the end of rotation of the engine pulley, the end of the conduit escapes to the housing side, so there is always excessive tension inside. is not added.

According to the assembly method of the present invention, the free movement length of the accelerator control cable extending from the tip of the conduit is set in advance, and each part of the actuator can be assembled while maintaining the guided length. Therefore, when connecting the actuator to the engine pulley, there is basically no need to make any adjustments inside the actuator, and it is sufficient to make slight adjustments to the connection part of the control cable. Furthermore, since the electrical angle accuracy of the rotation angle detector is also adjusted, there is basically no need to adjust the controller that sends drive signals to the motor.

[Example] Next, an actuator assembly and an assembly method thereof according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the actuator of the present invention, FIG. 2 is a longitudinal sectional view of the actuator shown in FIG. 1, and FIG.
The figure is a sectional view taken along the line (5)-1 (III) in Figure 2, Figure 4 is a front view showing an example of the engine pulley connected to the actuator in Figure 1, and Figures 5 to 7 are the main parts. FIG. 2 is an explanatory diagram showing an embodiment of the assembly method of the invention.

First, the overall structure of the actuator will be explained based on FIG.

In FIGS. 1 and 2, (1) is a housing having a partition wall (1a) in the center, and (M) is a motor fixed to a bracket (ib) covering one end of the housing (1).

A first reduction gear (2) of Ferguson's paradox gear type, a second reduction gear (3) of planetary gear type, and an output pulley (4) are housed in the housing (1).

A control cable (5) is attached to the outer circumference of the pulley (4).
One end of the inner cables (7) and (8) of (6) is locked, and a potentiometer (P) as a rotation angle detector is arranged concentrically with the output shaft (9) of the first reducer ('2J). is connected to.

First, the first reduction gear (2) will be explained.

A sun gear of a first reduction gear (2) is fixed on the outer periphery of the rotating shaft of the motor (M). The bracket (lb) to which the motor (M) is fixed has a through hole (lc) through which the sun gear (g) is inserted, and the bracket (lb) is rotatably fitted into the inner surface of the housing (1). A cylindrical portion 01) protrudes. An internal gear 02) serving as a fixed side is formed on the inner periphery of the cylindrical portion 01).

Furthermore, a bottomed cylindrical member n having an output shaft (9) concentric with the cylindrical portion 011 is rotatably supported on the partition wall (la) (see Fig. 2) of the casing (1). On the inside of the shaped member °C, an internal gear diagram on the rotating side is formed. Two planetary gears mesh with each other so as to be inscribed in both internal gears (12) and (14), and the planetary gear also meshes with the sun gear C.

There is a slight difference (for example, 2 to 3 teeth) in the number of teeth between the fixed-side internal gear 02) and the rotating internal gear 04). Note that the two planetary gears are supported so as to rotate on their own axis by the pin openings of the carrier field shown in FIG. 2, and the carrier is supported so as to rotate on its own axis on the bottomed cylindrical member U.

Next, the second reduction gear (3) will be explained.

An output shaft (9) is provided protruding in the axial direction from the center of the bottom surface of the bottomed cylindrical member D, and a second shaft is provided on the outer periphery of the output shaft {9}.
The sun gear of the reducer is engraved.

Furthermore, a pulley (4) having an internal gear (21) on its inner periphery is rotatably concentrically provided on the step (1d) of the partition wall (1a).

Three planetary gears are provided between the sun gear ■ and the internal gear (2TJ). It is rotatably fitted onto the main pin Q4 and functions as an idle gear.

Note that the plate is locked onto an annular step formed on the inner wall of the housing (1). Furthermore, a platform (47), which will be described later, is mounted on the plate so that its angle can be adjusted using screws, and both are pressed together by a gasket (63), a cover (64), and the like. Therefore, the platform (47) and the plate are each mounted in the housing (1) so that their angles about their own axes can be adjusted.

When the motor (M) in the first reducer (2) configured as described above is rotated in the direction of arrow (A), the sun gear (g) also rotates in the same direction, and both planetary gears b It revolves to the right while rotating to the left. As a result, the rotating internal gear Q4) rotates slowly at a reduction ratio and rotational direction based on the difference in the number of teeth between the rotating internal gear Q4 and the fixed internal gear Q4.

When the sun gear (2) in the second reducer (3) rotates, for example, to the left (in the direction of arrow (B)), it is connected to the internal gear Qυ, that is, the pulley (
4) is further decelerated and rotates in the direction of arrow (A).

Next, the configuration of the pulley 04) as an output member will be explained.

Two inner cable grooves (■) are formed on the outer periphery of the pulley (4), and two pull control cables (5), (6) and an inner cable (7) are formed on one side of the pulley. (8) Wire end cap, four parts (3l) for locking ■, (32
) is formed.

The end of the inner cable (8) is connected to the pulley (4) by locking the wire end cap (■) into the recess (3l), (32).
), are wound in opposite directions to each other in the inner cable groove, and extend in the tangential direction of the pulley (4). This allows the reciprocating rotational movement of the pulley (4) to be controlled by the two inner cables (7).
) ((8) The output mechanism that converts to reciprocating linear motion is changed.

For example, the internal gear surround, or pulley (4), is indicated by the arrow (^)
When rotated in the direction, one inner cable (sword) is pulled in the direction of the arrow (^l), and the other inner cable (12) is sent out in the direction of the arrow (^2).

Next, while referring to Figure 3, connect the control cable (5
), (6) are connected to the housing (1).

control cables (5), (6) conduits (34);
(35) is attached to the housing (1) via an attachment mechanism (36) shown in FIG. The mounting mechanism (3G) is screwed into the housing (1) and the nut (37
), and a cap (39) that is screwed onto the head of the main body (38).

A cavity (40) extending in the axial direction is formed in the main body (38).

The tip of the conduit (34) has a part of its cover removed and a ring-shaped smoother (4l) is caulked around its outer periphery.

The spacer (4l) slides within said cavity (40) and engages with the periphery of the hole (42) formed in the cap (39).

Furthermore, a cylindrical clamp (43) is provided on the outside of the conduit (34).
is crimped, and a loose spring (44) is interposed between the cap (39) and the clamp (43). Therefore, the conduit (34) is always connected to the housing (1).
) (direction of arrow (E)) to apply appropriate tension to the inner cable (7). Inner cable ('7)
If excessive tension is applied to the loose spring (44
) to move the conduit (34) in the direction of arrow (P).

Note that the spacer (41) (and therefore the conduit (34))
The stroke of the control cable (6) on the deceleration side is longer than that on the accelerator side. As will be described later, when installed: at full throttle when f3 is set,
In other words, this is done so that the position when the accelerator side inner cable (7'l) is pulled is set as the base line, and the position during idling can be roughly adjusted.

As shown in FIG. 4, there is an engine pulley (51) connected to a governor on the other end side of the control cables (5), (6), and the inner cable (7), (8) The other end is connected.

Therefore, the reciprocating linear drive of the inner rope of the control cable can be converted into the rotational drive of the engine pulley (51), and the accelerator can be controlled.

Next, a stopper for the pulley (4) and a limit switch for preventing overload of the motor (M) will be explained.

As shown in FIGS. 1 and 2, a pin (45) is provided protruding from the side surface of the pulley (4), and the pin (45) is inserted into the arc-shaped elongated hole (23a) formed in the plate a. The end of the elongated hole (23a) serves as a stopper for the pulley (4). The pin (45) is further connected to the limit switch (<LSI in Fig. 3), (L
S2))), thereby operating the pulley (
4) At the end of rotation, that is, when the engine is idling and at full throttle, the current passing through the motor (M) is cut off to protect the motor (M).

A deep hole (46) with a D-shaped cross section is formed in the output shaft (9) of the first reducer (2), and a potentiometer (46) that is a rotation angle detector is installed in the deep hole (46). P) detection axis (
Pa) has been inserted. The cross section of the shaft (Pa) is also a deep hole (4
It has the same shape as 6). The main body of the potentiometer (P) is connected to the housing (1) via the platform (47).
) is fixed.

The angular position of the platform (47) relative to the housing (1) can be adjusted by, for example, about 30°.

Note that as the rotation angle detector in the present invention, in addition to a potentiometer, a rotary encoder, a resolver, etc. can be used.

Next, a method of assembling the accelerator actuator constructed as described above will be explained.

First, as shown in Figure 5, the motor (M) and the first reducer ('2J), which had been assembled in advance, are placed in the housing (1).
and fit the output shaft (9) into the hole (1c) of the partition wall (la). When or after inserting the output shaft (9) into the hole (lc), use the jig (4) shown on the right side of Fig. 5.
8). The center pin (49) of the jig (48) has the same shape as the detection axis (Pa) of the potentiometer CP), that is, has a D-shaped cross section.

The angular position of the output shaft (9) is thereby precisely set. Note that three long pins (50) are fixed to the jig (48), and the long pins are the pins of the planetary gear ((2) in Figure 1).
4) is inserted and fitted into the hole (57) of the septum (la). When the angle of the output shaft (9) is determined, the bracket (l
If the screw hole (1e) in b) does not match the screw hole in the housing (1), use the jig (48) to attach the rotating internal gear 04.
), the motor (M) is rotated to rotate the bracket (lb) to an appropriate position.

Next, the jig (48) is removed and the pulley (4) is inserted into the step (ld) of the housing (1) as shown in FIG. At that time, the inner cable (7') shown in Fig. 1, the wire end cap of (8), and ■ are the four parts (3I) of the pulley (4), respectively.
(32) is locked. Furthermore, as shown in FIG. 3, the mounting mechanism (36) for the conduits (34) and (35) is screwed into the housing (1) via the cover plate (59). (
34), accurately measure the floating length ((1) in Figure 4) of the inner cable on the other end side, that is, the engine pulley (5I) side, using a jig, etc., and maintain the floating length (R). Adjust the screwing amount so that the pin (45) of the pulley (5) is accurately positioned at a predetermined position (for example, on the center line).

Note that if you accurately determine the effective length of the accelerator side control cable (5), the deceleration side control cable (
There will be some error on the 6) side. However, since the pulling end on the deceleration side is the position where the engine is idling, there is no particular problem, and the tension on the inner cable (8) is kept within an appropriate range because the stroke of the attachment mechanism is long.

After accurately positioning the output shaft (9) and pulley (4) as described above, attach a jig (80) having the same shape as the pin Q4 of the planetary gear n to the bulkhead (1a) as shown in Fig. and, using this as a reference, mesh the planetary gear between the output shaft (9) and the pulley (4). After inserting planetary gear n,
The mechanical positional relationship between the output shaft (9) and the pulley (4) is determined.

Next, after removing the jig (80), insert the plate to which the limit switches (Lh) and (LS2) have been attached in advance, aligning the pins with the planetary gear, and insert the plate into the four steps of the housing (1). engage with.

Furthermore, as shown in FIG. 7, a platform (47) with a potentiometer (P) attached thereto is inserted, and the detection shaft (Pa) of the potentiometer (P) is fitted into the shaft end of the output shaft (9).

In this state, rotate the motor (M) to the full throttle position, rotate the platform (47) to an angular position where the indicated potential of the potentiometer (P) is, for example, 85% of the full range, and at that position (2
6) Fix it to the plate.

After that, a terminal for electrical wiring (not shown), a second
Attach the gasket (63) and cover (64) shown in the figure in order.

In the actuator assembled as described above, as shown in Fig. 3, the rotation range (Rl) of the pulley (4) almost corresponds to the rotation range (R2) of the engine pulley (5l), and the former corresponds to the rotation range (R2) of the engine pulley (5l). It is made to exceed somewhat.

[Effects of the Invention] The actuator of the present invention can set the position of the output pulley to accurately match the rotation range of the engine pulley. According to the assembly method of the present invention, it is possible to accurately adjust the actuator in advance before assembling it into the vehicle.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the actuator of the present invention, FIG. 2 is a longitudinal sectional view of the actuator shown in FIG. 1, and FIG.
The figure is a sectional view taken along the [IIrl-(m) line in Fig. 2, Fig. 4 is a sectional view showing an example of an engine pulley to which the actuator of the present invention is connected, and Figs. FIG. 8 is a schematic perspective view showing an example of a conventional accelerator control system. (Main symbols in the drawing) (1): Housing (2J: 1st reducer (3): 2nd reducer (4): Pulleys (5), (6). Control cable (M): Motor (P): Potentiometer diagram 2

Claims (1)

[Claims] 1 (a) a housing; (b) a motor attached to the housing; (c)
(d) a sun gear provided on the output shaft of the reducer, (e
) a rotation angle detector having a detection shaft concentrically connected to the output shaft of the reducer; (f) mounting the rotation angle detector to the housing so that the angle around the detection axis can be adjusted; (g) a planetary gear disposed around the sun gear of the reduction gear; (h) having a shaft that rotatably supports the planetary gear, and having an angle about the output shaft with respect to the housing; a plate fixed so that its position can be adjusted; (i) a pulley having an internal gear meshing with the planetary gear and rotatably provided with respect to the housing about the axis of the output shaft; j) two control cables each having an inner cable whose ends are locked to the pulley and which are wound in opposite directions, the other end of each inner cable being connected to the engine pulley; An accelerator actuator consisting of: 2. Attachment means for locking the conduit of the control cable so that it can move in the axial direction with respect to the housing and restricting the position farthest from the housing, and a loose spring that constantly biases the conduit away from the housing. The accelerator actuator according to claim 1, comprising: 3. The accelerator actuator according to claim 1, wherein the restricting position of the conduit is set so that the loose spring acts in a range from slightly before to slightly beyond the rotation end of the pulley. 4. The accelerator actuator according to claim 1, wherein the reduction gear is a Fergansons paradox gear type reduction gear, and the stationary internal gear also serves as a motor mounting bracket. 5. A pin is provided protruding from the side wall of the pulley, and an arc-shaped elongated hole is formed in the plate to allow the pin to pass through, and both ends of the elongated hole constitute a stopper that regulates the rotation angle of the pulley. 2. The actuator according to claim 1, further comprising limit switches for stopping the motor operated by the pins near both ends of the actuator. 6 (a) The process of installing the speed reducer in the housing, (b) The process of installing the accelerator control cable with the pulley in the housing, in which the idle length of the inner cable on the engine side is set in advance, (c) The accelerator control cable adjusting the mounting position of the conduit to the housing and aligning the pin of the pulley to a predetermined angular position with respect to the output shaft of the reducer; (d) meshing the planetary gear between the pulley and the output shaft; Furthermore, a step of attaching the plate to the housing; (e) a step of attaching the rotation angle detector to the output shaft; and (f) a step of attaching the rotation angle detector to the output shaft.
2. The method of assembling an accelerator actuator according to claim 1, comprising the step of:) adjusting the mounting angle of the rotation angle detector so that the rotation angle detector is in a predetermined range at the full range position of the pulley.