JPH0121155Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a throttle position sensor, and in particular to a liquefied petroleum gas (hereinafter referred to as liquefied petroleum gas) installed in a taxi.
The shaft tip of the intake throttle valve has a rotation-preventing notch, which is suitable for use in high-vibration engines such as LPG (LPG) engines, which have severe operating conditions and require long-term vibration resistance. It has a rotary lever that is inserted and has a slit formed therein to facilitate the insertion, and a bushing that rotatably supports the rotary lever. This invention relates to an improvement of a throttle position sensor that detects the opening degree of a valve.

[Conventional technology]

Generally, in engines installed in automobiles, especially electronically controlled fuel injection engines, it is necessary to detect the opening degree of an intake throttle valve in order to use it as an index for performing various controls. Therefore, for example,
52045, as shown in FIG. 2, slits 14A and 14B are provided to facilitate insertion into which the shaft tip of the intake throttle valve having a rotation prevention notch is inserted. ,14
It has a rotary lever 12 having a C shape and a bushing 16 that rotatably supports the rotary lever 12, and the opening degree of the intake throttle valve is detected from the rotation angle of the rotary lever 12. A throttle position sensor 10 has been proposed. In FIG. 2, 18 indicates the bushing 16.
20 is a ring for fixing the shaft tip of the intake throttle valve inserted into the rotating lever 12; 22 is a rotor that rotates with the rotation of the rotating lever 12; 24 is a cover, for example, the rotor 22
The rotation angle with respect to the base 18 is detected from a change in resistance value or a change in the on/off state of a comb-like contact or an opposing contact. This throttle position sensor 10 is, for example, a third
As shown in FIG. 4 (for a carburetor engine) or FIG. The tip 32A of the throttle shaft 32 of the intake throttle valve is inserted into the rotary lever 12 and used. In Fig. 3, 34 is a throttle return spring;
5 is a nut for fixing the throttle return spring 34, and in FIG.
6 is an oil seal.

[Problem that the invention attempts to solve]

However, conventionally, the rotary lever 1 is made of resin and has a shape as shown in FIGS. 5 and 6.
The insertion positional relationship between the two slits 14A, 14B, 14C and the shaft 32 of the intake throttle valve is as shown in FIGS. 7 and 8.
Since the slits 14A and 14B are provided near both ends of the portion where the notch 32B of A is inserted, the throttle shaft 32 moves in the axial direction (in the direction indicated by arrow A in FIG. 7) due to external force. For example, due to friction between the thread of the shaft tip 32A and the inner surface of the rotary lever 12, the rotary lever 1
2 also moves in the direction of arrow A, and as shown in an enlarged view in FIG.
A, 12B, and 12C will be correct. Therefore,
When force is further applied to the rotary lever 12, the slit peripheral portion 12A located at the notch 32B of the shaft tip 32A moves the throttle shaft 32.
Because it is not in contact with the corner B, stress is concentrated on the corner B, which is usually 0.3 mm or less in radius. There was a problem in that the peripheral portion 12A of the 12 slits could break off from the corner portion B due to fatigue and be damaged. Such problems are particularly serious in high-vibration engines, such as LPG engines installed in taxis, which are used under very severe conditions and require long-term vibration resistance. In order to solve this problem, it is conceivable to increase the radius of the corner portion B, but this may restrict the movement of the throttle shaft 32 in the axial direction.

[Purpose of invention]

The present invention was made to solve the above-mentioned conventional problems, and is a throttle position sensor that has excellent vibration durability and can be used in high-vibration engines such as LPG engines installed in taxis. The purpose is to provide.

[Means to solve the problem]

In the present invention, a shaft end portion of an intake throttle valve having a rotation prevention notch is inserted.
It has a rotary lever formed with a slit to facilitate the insertion, and a bushing that rotatably supports the rotary lever, and the opening degree of the intake throttle valve is determined from the rotation angle of the rotary lever. In the throttle position sensor, at least one of the slits of the rotary lever is provided approximately in the center of a portion into which the notch of the tip of the shaft is inserted, and the peripheral portion of the slit of the rotary lever is provided at least one of the slits of the rotary lever. But everything,
The above object is achieved by being substantially supported from the inside by the shaft tip. Further, in an embodiment of the present invention, one of the slits of the rotary lever is provided in the center of the portion into which the notch of the tip end of the shaft is inserted (first slit).
figure).

[Effect]

The present invention includes a rotary lever having a slit formed therein to facilitate insertion into which the shaft tip of the intake throttle valve having a notch for preventing rotation is inserted, and a rotary lever formed with a slit to facilitate the insertion. In the throttle position sensor, the throttle position sensor has a rotatably supported bushing and detects the opening degree of the intake throttle valve from the rotation angle of the rotary lever. , provided approximately in the center of the portion where the notch of the tip of the shaft is inserted, and the peripheral portion of the slit of the rotating lever,
All are substantially internally supported by the shaft tip. Therefore, even if the throttle shaft moves in the axial direction and the rotary lever moves in the axial direction and interferes with the bushing, the stress applied to the periphery of the slit of the rotary lever is dispersed. Therefore, sufficient strength can be ensured in terms of vibration durability. Furthermore, if one of the slits of the rotary lever is provided in the center of the part where the notch of the tip of the shaft is inserted, the stress is completely evenly distributed;
Even better results can be obtained.

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. In this embodiment, a throttle position sensor 10 similar to the conventional example shown in FIGS. 2 to 7 is used, as shown in FIG. slits 14A,
One 14A of 14B and 14C is provided in the center of the portion where the notch 32B of the shaft tip 32A is inserted, and the slit peripheral portion 12 of the rotary lever 12 is provided.
A, 12B, and 12C are all substantially supported from the inside by the shaft tip 32A. In this way, all of the slit peripheral parts 12A, 12B, and 12C of the rotary lever 12 are substantially supported from the inside by the shaft tip 32A, thereby preventing interference with the bushing 16 and preventing the throttle shaft 32 from interfering with the bushing 16. Due to its own lateral vibration, stress applied to the slit peripheral portions 12A and 12B of the rotary lever 12 can be dispersed, and sufficient strength in terms of vibration durability can be ensured. According to the inventor's test results, it was confirmed that the strength of the periphery of the slit in this example was approximately twice that of the conventional one. In this embodiment, one of the slits 14A of the rotating lever 12 is provided at the exact center of the portion where the notch 32B of the shaft tip 32A is inserted, so that stress applied to the slit peripheral portions 12A and 12B is reduced. Particularly good results can be obtained with quite even distribution. Note that the position of the slit 14A is not limited to this, and it is also possible to arrange the slit 14A slightly offset from the center of the portion into which the notch 32B is inserted. In the embodiment described above, three slits 14A, 14B, and 14C were formed at equal intervals in the rotary lever 12, but the spacing and number of slits are not limited thereto.

[Effect of the idea]

As explained above, according to the present invention, it is possible to improve the vibration durability of the area around the slit of the rotary lever. It has an excellent effect that it can also be used in high-vibration engines such as mounted LPG engines.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the relative positional relationship between the slit of the rotary lever and the throttle shaft in an embodiment of the throttle position sensor according to the present invention;
FIG. 2 is a vertical cross-sectional view showing the overall configuration of an example of a conventional throttle position sensor, FIG. 3 is a vertical cross-sectional view showing how the throttle position sensor is attached to a carburetor engine, and FIG. , a vertical cross-sectional view showing how it is installed in an electronically controlled fuel injection engine;
FIG. 5 is a front view showing the shape of the rotary lever used in the throttle position sensor, FIG. 6 is a plan view, and FIG. 7 is a diagram showing the shape of the rotary lever in the conventional example. FIG. 8 is a longitudinal cross-sectional view showing the inserted state of the shaft, FIG. 8 is a cross-sectional view taken along the - line in FIG. 7, and FIG. 9 is a state of interference with the bushing around the slit of the rotary lever in the conventional example. FIG. 2 is an enlarged cross-sectional view of a portion of FIG. 2 for explaining. 10...Throttle position sensor, 12...Rotating lever, 12A, 12B, 12C...Slit periphery, 14A, 14B, 14C...Slit, 1
6...Butching, 32...Throttle shaft, 32A...Shaft tip, 32B...Notch.

Claims (1)

[Claims for Utility Model Registration] (1) A rotary lever having a slit to facilitate insertion into which the shaft tip of an intake throttle valve having a notch for preventing rotation is inserted; , a bushing that rotatably supports the rotary lever, and a throttle position sensor that detects the opening degree of the intake throttle valve from the rotation angle of the rotary lever, comprising: a slit of the rotary lever; At least one of the above is provided approximately at the center of the portion of the tip of the shaft into which the notch is inserted, and the entire area surrounding the slit of the rotating lever is provided with:
A throttle position sensor, wherein the throttle position sensor is substantially supported from inside by the shaft tip. (2) One of the slits of the rotary lever is provided at the center of a portion of the shaft tip into which the notch is inserted.
Throttle position sensor as described in section.