JPH0381536A - Accel actuator - Google Patents

Abstract

PURPOSE:To facilitate assembling work by constituting a device out of a motor, a first reduction gear connected to this, a center shaft provided in parallel with it and rotating through receiving torque from it, a second redudtion gear coaxially arranged around the center shaft, and an angle detector connected to the center shaft. CONSTITUTION:A base plate 32 fitted with a potentiometer P and a micro switch LS1 is fitted in a housing 1. Next, inner cables 25, 26 of control cable are locked and wound on an output pulley 17 of a second reduction gear 3, fitted in the housing 1, and a conduit is fitted in the housing 1, further an idle gear 24 and a bracket 22 are assembled. Next, a motor M and a first reduction gear 2 previously assembled are fitted to the housing 1. The switch LS1 is instituted on the position a little over the rotation angle of the pulley 17 at full throttle position, and the reference angle of the meter P coincides with it. Finally, a center shaft 19 is inserted, a pinion 21 is engaged with the idle gear 24, a transmitting gear 20 is engaged with a gear 12, and a cover is fitted.

Description

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

[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.

For example, as shown in Fig. 7, this device detects the rotation angle of an engine pulley (51) attached to a governor on the engine side using a rotation angle detector (hereinafter explained using a potentiometer as a representative) (Pl). , the signal of the rotation angle is compared with the instruction signal from the rotation speed setting device in the controller (c), and the motor (motor) of the actuator (52) is rotated in the direction to eliminate the deviation until the deviation disappears, and further output Control cable (5) from pulley (53)
4) and (55) to adjust the governor opening degree.

[Invention or task to be solved] III In order to directly control the state of the Ql object, originally a potentiometer (P) should be connected directly to the engine pulley (51).
i) is preferably connected. However, the engine pulley (
If the potentiometer (Pl) is placed near the point 51), there is a problem that the life of the potentiometer will be shortened due to vibration and the like. 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, for example, as shown by the imaginary line in FIG. 7, a potentiometer (P2) is provided in the actuator (52) to control the rotation angle of the output trigger instead of the governor opening. However, if you do that, the control cables (54) and (5)
5) due to the accumulation of connection and assembly errors, the engine pulley (5)
There is a problem that 1) and the operating range of the output pulley (53) of the actuator do not correspond accurately.

Especially in the case of construction machinery, the potentiometer output is used to control the discharge amount of the hydraulic pump (for example, to control the angle of the swash plate of a swash plate pump), so the correspondence between the potentiometer angle and the governor opening must be as accurate as possible. There is.

In addition, the output pulley (53) of the actuator (52) is normally provided with limit switches (LSl) and (LS2) that detect rotation limits to protect the stopper and motor, but the output is limited by these limit switches (LSl) and (LS2). It is also necessary to accurately match the rotation range of the pulley (53) 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 (51), the position of the conduit connection of the control cables (54) and (55), the position of the output pulley (53), and the position of the potentiometer (P2). ) and the output shaft, the assembly and adjustment work becomes extremely complicated.

Also, since the configuration is a mix of mechanical elements such as a speed reducer, electric elements such as a motor, potentiometer, and limit switch, is there any need for electrical wiring? It became U 211,
Moreover, there is the problem that it is difficult to make adjustments after assembly.

An object of the present invention is to provide an actuator with a built-in potentiometer that can reduce the complexity of each part of the actuator and easily perform highly precise adjustments.

A further object of the present invention is to provide an actuator that is easy to assemble and can be downsized.

[Means for Solving the Problems] The accelerator actuator of the present invention includes a (nomo motor) and (
LT) a first speed reducer connected to the motor; (c) a central shaft that is provided parallel to the first speed reducer and rotates upon receiving torque from the first speed reducer; It is composed of a second reducer having a concentrically arranged output pulley for driving a cable, and (d) an angle detector connected to the central axis.

Such an actuator preferably includes a pair of limit switches that detect when the rotational angle of the output pulley exceeds the limits of a predetermined angular range.

Further, it is preferable that a first transmission gear is formed on the outer periphery of the output member of the first reduction gear, and a second transmission gear that meshes with the first transmission gear is provided at one end of the central shaft.

[Function] When the motor rotates, the rotation is decelerated by the first reduction gear and transmitted to the central shaft of the second reduction gear.

Furthermore, the rotation of the central shaft is transmitted to the output pulley, which adjusts the opening degree of the governor via a cable.

The rotation angle detector is not directly connected to the output pulley, but is connected to a central shaft having a lower reduction ratio than the output pulley. Therefore, the detector can detect over a wide angular range.

In the actuator of the present invention, the first reduction gear and the second reduction gear are arranged parallel to each other, so that the actuator is shaped like a conventional actuator folded back at the center. Therefore, electrical components such as a motor, a rotation angle detector, and a limit switch can all be housed in one compartment (electrical element compartment). Therefore, electrical wiring work is relatively simple, and sealing with packing etc. is also simple and reliable. Also, even though the total space is the same as before, it is easy to use the space because it is organized. Furthermore, opening the cover provides a wide opening, making it easy to assemble and adjust.

Furthermore, since the first reducer and the second reducer are separated and connected by a transmission gear, the angular position of the rotation angle detector can be adjusted independently and then the two can be connected. . Therefore, assembly work is easy and the angle of the potentiometer can be set accurately.

[Embodiment] Next, the accelerator actuator of the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the actuator of the present invention, FIG. 2 is a vertical cross-sectional view of the actuator shown in FIG. 1, and FIG. 4 is a front view showing an example of an engine-side lever mechanism connected to the actuator of the present invention, and FIG. 5 is a cross-sectional view of M-( in FIG. 4).
V) Linear sectional view, FIG. 6 is a process explanatory diagram showing an example of the assembly procedure of the actuator shown in FIG. 1.

In Fig. 1, (1) is a rectangular parallelepiped-shaped housing, and the housing (1) has a rectangular cross section and a partition wall (1) in the center.
a), and a cover member (I
It is constructed in a box shape from C) and (ld).

The lower cover edition' (ld) is attached to the frame (1b) together with the packing (le).

The partition wall (1a) divides the inside of the housing (1) into a mechanical compartment for accommodating a first reducer (2) and a second reducer (3), a motor (M), a potentiometer (P), and a microswitch ( limit switch) (Lsl), (L
S2) and an electrical compartment for accommodating.

The motor (M) is connected to the partition wall (1) via the bracket (4).
a) is fixed. The bracket (4) is a member that also serves as a stationary gear of a first reduction gear (2), which will be described later. Any type of motor may be used as the motor (M) as long as it can rotate in both forward and reverse directions.

Next, the first reduction gear (2) will be explained with reference to Figures 1 and 2.

The first speed reducer (2) is a so-called Ferguson's mechanical paradox type speed reducer, and a sun gear (5) is fixed to the rotating shaft (Ma) of the motor (M). The bracket (4) is formed with a through hole (6) through which the rotating shaft (Ha) of the motor and the sun gear (5) are inserted, and a cylindrical portion (sword) protrudes upward.

A static internal gear (8) is formed on the inner surface of the cylindrical portion (7). The bracket (4) has a flange portion (4a
) on the bulkhead (la).

There is a boss part (9) on the bottom surface of the upper cover member (1C).
is formed, and a bottomed cylindrical member 0 is formed on the boss portion (9).
0) is rotatably provided. Bottomed cylindrical member 00)
The inner surface of the gear has a slightly different number of teeth than the west gear (8) on the stationary side (for example, if the total number of teeth is about 100, the number of teeth is 2 to 2).
Approximately 3 pieces) internal tooth gear 01) on the rotating side is formed,
A transmission gear (l force) is formed on the upper outer peripheral surface.

A carrier plate a'3 is further provided on the boss portion (9).
I is rotatably provided, and carrier play 4 (1
On the two pins (14) of 31 are planetary gears (2
) is rotatably provided. When assembled, the planetary gear meshes with the sun gear (5) and both internal gears (8), 01), and together constitutes a Ferguson's mechanical paradox gear type reduction gear.

In the first speed reducer (2), the rotation of the motor (M) and the sun gear (5) is reduced to about 1/100, for example, and transmitted to the bottomed cylindrical member 00).

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

A boss portion 06) is protruded from the upper surface of the partition wall (1a), and an output pulley (17) is rotatably provided on the outer periphery of the boss portion a. An internal gear na is formed on the inner periphery of the output pulley (17).

Further, a central shaft is rotatably inserted into the inner hole of the boss portion 0■. At the upper end of the central shaft 09), the first reducer (
A transmission gear retainer that meshes with the transmission gear (12) of the bottomed cylindrical member 00) of 2) is integrally provided, and a pinion is carved on the surface of the central portion of the central axis υ9. There is a housing (1) between the transmission gear (A) and the output pulley 07).
) is interposed, and an idle gear (24) is rotatably provided on two pins □□□ that protrude downward from the bracket a.

The idle gear C4 meshes with a pinion (2I) on the center shaft 09 and an internal gear Oa on the inner circumference of the output pulley (17), and as a whole, the transmission gear □ and the center shaft a9 are used as input members, and the output pulley 0 '7) as an output member. The reduced speed ratio of the second reduction gear is the ratio of the number of teeth of the pinion (21) and the internal gear Oa, and is approximately 1/3 to 1/4.

As shown in Fig. 3, a groove (a) is formed on the surface of the output pulley q7) to guide the two inner cables □□□, (4), and the two inner cables □□□, (Cable end assembly at the end of 2e □
□□ and the prisoner are respectively locked to the wire locking company seal of the output pulley 07).

A deep hole (31) having an angular cross-section is formed in the end face of the central shaft 09 passing through the boss portion aQ of the partition wall (la).

A detection shaft (Pa) of a potentiometer (P) fixed to a printed circuit board (32) provided in the compartment for electrical elements is fitted into the deep hole (31).

The shaft end of the detection shaft (Pa) also has a cross-sectional shape.

Furthermore, two microswitches (LSI), (LS2) are installed on the printed circuit board (32).
The tip of the lever with a roller passes through an opening formed in the bulkhead (la) and cooperates with a protrusion formed on the bottom surface (lower side in the drawing) of the output pulley (a).
7) Detects over-speed. This is to protect the motor (M) by immediately stopping the motor (M) after detection.

As shown in FIG. 3, the housing (1) has a conduit (33) for slidably guiding the inner cable (1) and (2G).
, (34) are locked. Inner cable (to), (2
0 and the conduits (33) and (34) constitute a pair of pull control cables.

Next, the engine-side governor operating lever and loose spring will be explained with reference to FIGS. 4 and 5.

FIG. 4 shows the other end of the control cable shown in FIG. 3. Control cable conduits (33), (34)
) are each fixed to the stationary member (36) by a casing cap (35>).

The inner cable (to) (4) is a loose spring (
37> to both ends of the governor operating lever (38). Note that the loose spring (37) is inserted in a pre-compressed state so as to generate an initial biasing force higher than the maximum value of the reaction force of the return spring on the governor side. The governor operating lever (38) has the same function as the engine pulley (51) in Figure 7, and is connected to the inner cables of the two pull control cables (arrows (A) in 20).
By pulling in the direction (c), it rotates in the directions of arrows (B) and (D) to change the governor opening degree.

The loose spring (37) is connected to the bottom (39a) of the U-shaped part set (39) and the hole (3
It is interposed between the cable end (40) fixed to the end of the inner cable (2) that has passed through the cable (9b), and is provided on the outer periphery of the inner cable (40). Tip (39c) of U-shaped part II' (39)
) is connected to the governor operating lever (38) by pin <42>.
) is connected to both ends of the rotation self-made. In addition, in Figure 5 (
40a) is a nipple that is crimped onto the inner cable (2) to give an initial biasing force to the loose spring (37). Further, (43) and (44) in FIG. 4 are stoppers that restrict the rotation range of the governor operating lever (38), and are shown conceptually for ease of understanding. Stopper (43L
The position of (44) may be adjustable.

The actuator depicted above performs substantially the same function as the conventional actuator shown in FIG. That is, the accelerator control amount set by the controller is compared within the controller with the output amount detected by the potentiometer (P), and the motor (M) is rotated forward or backward depending on the positive or negative value. Thereby, the output pulley 07) is rotated until the detected amount of the potentiometer (P) matches the set value, and the governor operating lever (38) is further rotated via the control cable.

At that time, when the inner cable (4) on the accelerator side is pulled in the direction of arrow (A) in Fig. 4, the governor is activated and z<-(3
8) rotates in the direction of arrow (B), and the engine speed increases. If the controller setting is full throttle,
The lever (38) rotates until it comes into contact with the stopper (43).

However, the actuator motor (M) does not stop immediately at that point and pulls the inner cable a little more in the direction of the arrow (A), deflecting the loose spring (37) and applying tension to the inner cable (to). The motor (M) is stopped in the state where the motor (M) is applied.

b Therefore, even if there is some variation in the resting position of the output pulley 07) in Figure 3, full throttle operation is reliable and stable.

Conversely, when the inner cable (4) on the deceleration side is pulled in the direction of arrow (c), the lever (38) rotates in the direction of arrow (D) and the engine speed decreases. When the controller is set to idling operation, the governor is controlled to the opening degree for idling operation, and when the controller is set to engine stop, the lever (38) moves in the direction of the arrow ( ) until it comes into contact with the stopper (44).
D) rotate in the direction. At that time, the loose spring (3
7) is stopped in a state where the engine is slightly bent, so the engine stopped state is reliably maintained.

Next, the procedure for assembling and adjusting the actuator configured as described above will be explained.

First, as shown in Fig. 6, a printed circuit board (32) with a potentiometer (P) 1 and a microswitch (LSI) (LS2) mounted thereon is attached to the housing (1). Next, lock the inner cable (4) of the control cable to the output pulley (07) of the second reducer (3), wrap it around it, and install it inside the housing (1).
33) and (34) are also attached to the housing (1). Furthermore, assemble the idle gear (24) and bracket.

Next, connect the pre-assembled motor (M) and the
Assemble the reducer (2) to the housing (1).

In this state, push the governor operating lever (38) to the stop position (4).
3), set the micro switch (LSI), (LS2) at a position slightly beyond the rotation angle of the output pulley O'7) determined by this, and set it to the full throttle position. Adjust the reference angle (for example, 85% of full range) of the potentiometer (P).

In this state, since the center shaft Og4 is not inserted, the position of the potentiometer (P) etc. can be adjusted relatively easily regardless of the position of the first reduction gear (2). Finally, the central shaft 09 is inserted, the pinion (21) is brought into mesh with the idle gear (241), the 4th transmission gear is brought into mesh with the transmission gear (12) of the first reduction gear, and the cover (1C) is attached.

If you need to readjust the center shaft 09 after inserting it,
Pull out the center shaft 09 somewhat upwards and transfer the transmission gear 02),
■The mesh between the pinion (21) and the idle gear (
When the output pulley 07) is disengaged from the output pulley 07), it becomes free to rotate. Therefore, it can be easily adjusted in that state.

With the actuator of the present invention, like soft earth, the connection between the first reduction gear (2) and the second reduction gear (3) can be easily disconnected, so that adjustment work is simplified.

[Effects of the Invention] In the accelerator actuator of the present invention, the reduction gear is divided into a first reduction gear and a second reduction gear, and both are arranged in parallel. Therefore, the length in the axial direction is shortened, and the external size of the entire device is small.

Moreover, since both are arranged in parallel, the electrical elements to be connected to each end can be housed together in one compartment. Therefore, the wiring work is easy and the seal structure is also easy to hang.

Furthermore, since the mechanical connection between the first speed reducer and the second speed reducer can be easily separated, adjustment work is simple.

Also, since relatively wide openings can be provided on both sides of the housing, assembly of the device is simple.

[Brief explanation of 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 cross-sectional view taken along the line (III)-(I[) of FIG. 2, FIG. 4 is a front view showing an example of an engine-side lever mechanism connected to the actuator of the present invention, and FIG. (V)
6 is a process diagram showing an example of an assembly procedure of the actuator shown in FIG. 1, and FIG. 7 is a schematic perspective view showing an example of a conventional actuator. (Main symbols in the drawing) (1): Housing (LA): Partition wall (2): 1st reducer (3) 2nd reducer a7): Output pulley (H): Motor (P): Potentiometer (LSI) (LS2) Microswitch patent applicant Nippon Cable System Co., Ltd.

Claims (1)

[Scope of Claims] 1 (a) a motor; (b) a first reducer connected to the motor; (c) provided in parallel with the first reducer and configured to receive torque from the first reducer. (d) an angle detector connected to the central shaft; accelerator actuator. 2. The accelerator actuator according to claim 1, further comprising a pair of limit switches for detecting that the rotation angle of the output pulley exceeds a predetermined angle range. 3. The accelerator actuator according to claim 1, wherein a first transmission gear is formed on the outer periphery of the output member of the first reduction gear, and a second transmission gear that meshes with the first transmission gear is provided at one end of the central shaft. . 4. A pair of pull control cables each having one end wound and locked in opposite directions on the output pulley, the other end of the pull control cable being connected to the governor operation side via a loose spring. 1. The accelerator actuator according to 1. 5 The housing is partitioned into a first section and a second section by a partition wall, the motor and the angle detector are housed in the first section, and the first speed reducer and the second speed reducer are housed in the second section. The accelerator actuator according to claim 1, which is housed in the accelerator actuator. 6. The accelerator actuator according to claim 5, wherein a pair of limit switches for detecting that the rotation angle of the output pulley exceeds a predetermined angle range are housed in the first section.