JPS6217627Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a joint mechanism that transmits the rotational force of an actuator shaft to the throttle valve shaft of an engine.

Conventional general shaft joint mechanisms include those that use a coil spring 11 as a part of the joint, as shown in FIG.
As shown in Figure 2, a bellows 21 is usually used as part of the joint, and these have the effect of correcting the misalignment of the rotation center axes of both the drive shaft and the driven shaft. . Therefore, it is effective when both rotation center axes are in the same plane and are inclined, but if not, the shaft joint will be twisted in a complicated manner, and the transmission loss of rotational force will be reduced. This has the disadvantage of accelerating fatigue failure of shaft joints.

To prevent this, use the above-mentioned shaft joints at two locations, or install pieces 31 with protrusions 32 and 33 on the drive shaft and driven shaft, respectively, as shown in FIGS. 3a and 3b. It is necessary to use a shaft joint that is sandwiched between disks 36 and 37 having grooves 34 and 35 for receiving the protrusions 32 and 33 of the attached piece 31. However, in Figure 3 a and b like this
This shaft joint has the disadvantage that the protrusions 32 and 33 of the bridge 31 move in the grooves 34 and 35 of the discs 36 and 37 as the shaft rotates, causing friction, resulting in a large loss of transmitted torque. .

As described above, when conventional general shaft couplings are used to connect the shaft of an engine's throttle valve and the shaft of an actuator, they have the disadvantage of complicating the mechanism and increasing torque transmission loss. Ta.

This idea focused on the fact that the engine's throttle valve opens and closes within an angle of less than 90 degrees, whereas general shaft joints are designed for 360 degrees of rotation. It is an object of the present invention to provide a joint mechanism for a shaft of a throttle valve of an engine, which has a small size and simple structure, and reduces transmission loss due to friction etc. by aiming at transmitting rotational force.

An embodiment of this invention will be described below.
In Fig. 4, 41 is the shaft of the throttle valve;
42 is an arm attached to the shaft 41, and 43 is a post attached to the arm 42.

Reference numeral 44 denotes the shaft of the actuator, which is arranged approximately concentrically with the shaft 41 of the throttle valve.
45 and 46 are two leaf springs attached to the shaft 44, and 47 is a screw that stacks the leaf springs 45 and 46 and fixes them to the shaft 44.
Insert the post 43 of No. 2.

In the above embodiment, the shaft 44 of the actuator
rotates clockwise toward the shaft 41 of the throttle valve, the leaf spring 46 of the leaf springs 45 and 46 that rotate together with the shaft 44 is rotated clockwise toward the shaft 41 of the throttle valve.
3, the force rotates the arm 42, and the rotational force is transmitted from the actuator shaft 44 to the throttle valve shaft 41. Similarly, when the actuator shaft 44 rotates counterclockwise, the leaf spring 45 pushes the post 43 and the arm 42 rotates counterclockwise.
The rotational force is transmitted to the shaft 41 of the throttle valve via.

In this operation, if the rotation center axes of both the actuator shaft 44 and the throttle valve shaft 41 are completely on one straight line, no relative movement will occur between the post 43 and the leaf springs 45, 46. These rotate as a unit, but if the center axis of rotation is at an angle or is misaligned, the post 43
Movement occurs between the leaf springs 45 and 46.
Post 43 is used to make this movement easier.
This provides flexibility in the connection between the plate springs 45 and 46. That is, the shaft 44 of the actuator
When the central axes of rotation of the and throttle valve shafts 41 are in the same plane perpendicular to the leaf springs 45, 46 and have an angle, as shown in FIG. 5a, the leaf springs 45, 46 However, in this case, simply increasing the distance between the leaf springs 45 and 46 causes the post 43 and the leaf springs 45 and 46 to be tilted.
The connection relationship with 46 is maintained. In addition, leaf spring 4
If both rotation center axes are tilted in a plane parallel to the leaf springs 45 and 46, as shown in FIG. The binding relationship is maintained. Generally, when both rotational axes have an angle, both of the cases a and b in FIG. 5 will occur, but the coupling relationship will be maintained. In addition, if the two rotation center axes are misaligned, as the shafts 44 and 41 rotate, the post 4
3 rotates relative to the leaf springs 45, 46 as shown in FIG. 5c, or linearly moves as shown in FIG. 5d, and these movements occur in combination.
However, as can be seen from FIGS. 5c and 5d, since the post 43 is only held between the leaf springs 45 and 46 by the spring pressure, the above movement is carried out without difficulty.

Therefore, even if there is an inclination or misalignment between the rotational axes of the actuator shaft 44 and the throttle valve shaft 41 due to their relative positions, rotational force can be transmitted with little loss.

As described above with respect to the embodiments, this invention has a simple structure, can be easily installed and removed, and can transmit rotational force with little transmission loss even if the rotational axes are mutually tilted or misaligned. Since transmission is possible, it is ideal as a joint mechanism between the throttle valve shaft and actuator shaft of an engine whose rotation range is less than 90 degrees.

[Brief explanation of the drawing]

Figures 1 and 2 are side views showing a conventional example, and Figures 3a and 3b are side views of another conventional example.
Figure a is a side view, Figure 3 b is an exploded perspective view, Figure 4 is a perspective view showing an embodiment of this invention, Figures 5 a,
b, c, and d are diagrams for explaining the operation of the above embodiment, respectively. 11... Coil spring, 21... Bellows, 41
... Throttle valve shaft, 42 ... Arm, 4
3... Post, 44... Actuator shaft, 4
5, 46...plate spring, 47...screw.

Claims (1)

[Scope of utility model registration request] an engine throttle valve shaft, an arm attached to the shaft, a post fixed to the arm at a position eccentric to the shaft, and an actuator arranged approximately concentrically with the shaft. and two leaf springs attached so as to have a component extending substantially perpendicular to the axis of the actuator, and the post of the arm is sandwiched between the two leaf springs. A joint mechanism for a shaft of a throttle valve of an engine, characterized in that the rotational force of the shaft of an actuator is transmitted to the shaft of the throttle valve.