JP2584851Y2 - Throttle opening detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a potentiometer type throttle opening detecting device for detecting the opening of a throttle valve of an internal combustion engine.

[0002]

2. Description of the Related Art As a conventional throttle opening detecting device,
8 and 9 (Japanese Utility Model Publication No. 57-6)
No. 961 and Japanese Utility Model Laid-Open No. 1-92104). A lower end of a bush 2 as a bearing member is inserted and fixed in a hole in the center of the case 1. The bush 2 has a cylindrical shape and a large-diameter portion 2 on the outer periphery of a portion protruding above the case 1.
a and the small diameter portion 2b are formed. And the large diameter part 2
a, a resistor substrate 3 for a potentiometer having a hole in the center is mounted and fixed on the case 1.

[0003] After inserting a wave washer 10 'to be described later, a disc-shaped rotor 4' is inserted into the small diameter portion 2b of the bush 2, and the bush 2 is prevented from being removed by a tapered fixing ring 5 fixed to the upper end of the bush 2. It is. The rotor 4 'is rotatably supported on the outer peripheral surface of the small diameter portion 2b of the bush 2, and rotates in conjunction with a throttle valve shaft (not shown). In particular,
The arm 6a of the guide contact 6, which is rotatably supported in the bush 2 and engages with the throttle valve shaft, is driven to rotate via a claw-shaped partition 4a. The rotor 4 ′ is provided with potentiometer brushes (current-collecting brushes and resistance-side brushes) 8 and 9 at two locations by a support plate 7 screwed to the rotor 4 ′, and slides on the resistor substrate 3. It works. Also, the rotor 4 '
Is movable a predetermined distance in the axial direction of the small diameter portion 2b.

Incidentally, reference numeral 11 denotes a cover, 12 denotes a movable contact piece for a throttle switch, and 13 denotes a connector. Wave washer
10 'is a shape obtained by bending a flat washer-shaped leaf spring material having a thickness of about 0.15 mm as shown in FIG.
Are inserted into the small-diameter portion 2b, and two places A ₁ ,
Pressed against the stepped portion of the bush 2, which is a non-rotating portion with A _2, it is pressed against the rotor 4 'at altitude two places of the side B _1, B _2. As a result, the rotor 4 ′ is lifted and held, and the brush 8,
9 prevents variations in contact pressure.

Here, the wave washer 10 'holds the rotor 4' at two locations B ₁ and B ₂ , but the rotor 4 '
Due to the relationship between the position of the arm 6a of the guide contact 6 above and the mounting position of the brushes 8, 9 to the rotor 4 ', there is an ideal position where the contact pressure stability can be maintained.
(B ₁ , B ₂ ).

[0006]

However, in such a conventional throttle opening detecting device, even if the rotor rotates, the wave washer does not rotate integrally with the rotor, so that the relative position is not constant. As a result, there has been a problem that the wave washer deviates from the optimum position, and the contact pressure varies.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to make the wave washer always at an optimum position.

[0008]

For this reason, the present invention provides a fixedly arranged resistor substrate and a bearing member arranged at right angles to the resistor substrate so as to be rotatably supported and interlocked with a throttle valve shaft. A rotor that rotates and can move a predetermined distance in the axial direction of the bearing member, a brush attached to the rotor and slides on the resistor substrate, and a non-rotating portion inserted into the outer periphery of the bearing member. An annular wave washer that is interposed between the rotor and the rotor and urges the rotor in the axial direction of the bearing member, wherein a protrusion is formed on an outer peripheral portion of the wave washer, and In this configuration, an engagement portion that engages with the protrusion in the rotation direction is formed.

[0009]

In the above configuration, when the rotor rotates,
The engaging portion engages with the protrusion of the wave washer, and integrally rotates the wave washer. Accordingly, the relative positional relationship between the wave washer, the rotor, and the brush that rotates integrally therewith is always constant, and the wave washer always has an ideal position where the contact pressure stability of the brush can be maintained. Variation in contact pressure can be prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. 1 to 4 show an embodiment of the present invention. The configuration other than the rotor 4 and the wave washer 10 is the same as that of the conventional example shown in FIGS.

The wave washer 10 has a shape obtained by bending a flat washer-like leaf spring material having a thickness of about 0.15 mm.
It is inserted into the small-diameter portion 2b of the bush 2 and pressed against the step portion of the bush 2 which is a non-rotating portion at _two low places A ₁ and A ₂ , and the rotor is mounted at two high places B ₁ and B ₂ at the high places. 4, projections 21 extending outward are formed at two locations B ₁ and B ₂ on the high side, respectively, and an enlarged portion 22 is formed at the tip of each projection 21.

The material of the wave washer 10 is stainless steel (SUS), spring steel (SUP), carbon tool steel (SK).
5) and the like. Also, the rotor 4
Is rotatably supported on the outer peripheral surface of the small diameter portion 2b of the bush 2, has a partition portion 4a on the upper surface, and is driven to rotate by the arm 6a of the guide contact 6 engaged with the partition portion 4a. Brushes 8 and 9 for potentiometers are attached to the lower surface of the rotor 4 by a support plate 7, and a pair of engaging portions 23 and 23 are integrally protruded at two locations during resin molding. In addition, each pair of engaging portions 23, 23 is a wave washer.
10 are formed at target positions on the lower surface of the rotor 4 corresponding to the two projections 21, and one of them is disposed almost directly behind the center between the two teeth of the claw-shaped screen portion 4a.

Here, the width t ₁ of the projection 21 is equal to the pair of engagement portions 2.
The projection 21 is inserted between the pair of engaging portions 23, 23 so as to be smaller than the interval between 3, 3. Also, the width t of the enlarged portion 22
₂ is larger than the interval between the pair of engaging portions 23, 23 so that the expanding portion 22 can be hooked on the side surfaces of the engaging portions 23, 23. That is, the protrusion 21 of the wave washer 10 is
When the wave washer 10 is assembled, the expanding portion 22 is pressed against the side surfaces of the engaging portions 23, 23 by the restoring force of the wave washer 10, so that the wave washer 10 can be temporarily fixed to the rotor 4 by a frictional force.

[0014] However, the length L ₁ of the protrusion 21 is longer than the length L ₂ of the engaging portion 23 can be projection 21 when pressing the wave washer 10 is moved in a centrifugal direction (arrow C). Therefore, at the time of assembling, the pair of engaging portions 23,
If the protrusion 21 of the wave washer 10 is positioned between the two, when the rotor 4 rotates, the engaging portion 23 is
The wave washer 10 is integrally rotated by engaging with the protrusions 21 of the ten. Therefore, the relative positional relationship between the wave washer 10, the rotor 4, and the brushes 8 and 9 that rotate integrally therewith is always constant, and the wave washer 10 can always maintain the contact pressure stability of the brushes 8 and 9. It becomes an ideal position, and it is possible to prevent variations in contact pressure.

Next, the assembling procedure will be described in detail. First, the connector 13 having the movable contact piece 12 and the bush 2 are fixed to the case 1 by caulking. Next, the resistor substrate 3 having lead wires (not shown) is fixed to the case 1 by caulking with the pins 14.

Next, the brushes 8 and 9 are attached to the rotor 4 by the support plate 7. Next, the wave washer 10 is attached to the rotor 4. In this case, first, one projection 21 of the wave washer 10 is inserted between the one engaging portion 23 of the rotor 4 with the surface of the rotor 4 having the engaging portions 23 facing upward. Then, the other projection 21 of the wave washer 10 is positioned at the center between the other engagement portions 23 of the rotor 4. Then, the wave washer 10 is pushed with a finger and spread in the centrifugal direction (the direction of arrow C). Then, the other engaging portion 2
The other protrusion 21 is engaged between 3 and 23. After that, release the hand from the wave washer 10. Then, the wave washer 10 causes the enlarged portions 22 to move in the axial direction (the direction of arrow D) due to the restoring force, and the enlarged portions 22 are pressed against the side surfaces of the engaging portions 23, 23 (see FIGS. 2 and 3). State), and is temporarily fixed to the rotor 4 by frictional force. Therefore, the rotor 4 and the wave washer 10 can be temporarily fixed in advance so that the wave washer 10 does not drop to an ideal position, which facilitates assembly.

Next, the rotor 4 is inserted into the bush 2. Next, the fixing ring 5 is fitted to the bush 2 to prevent the rotor 4 from coming off. Next, the guide contact 6 is rotatably inserted into the bush 2. In this completed assembly state, an axial pressing force acts on the wave washer 10 and an arrow C
The projection 21 is engaged with the engaging portions 23 and 23 in the rotation direction, but is movable in the axial direction. Become. Thereby, the spring property of the wave washer 10 is not impaired.

As described above, the wave washer 10 can be temporarily fixed to the rotor 4 easily and manually, and the spring characteristics of the wave washer 10 can be maintained well after assembly is completed. Next, another embodiment will be described. The enlarged part at the tip of the projection 21 of the wave washer 10 is indicated by 31 to 31 in FIGS.
Various shapes can be provided as shown in FIG. In short,
It is only necessary that the enormous parts 31 to 33 have a function of being hooked.

The example shown in FIG. 5D has only the projection 21 and does not have an enlarged portion. In this case, the engaging portion on the rotor 4 side is shown in FIG. 6A. As described above, the wave washer 10 may be prevented from dropping by using an engagement portion 34 formed by a pair of L-shaped members or an engagement portion 35 formed by a single U-shaped member as shown in FIG. 6B. As shown in FIG. 7, the engagement portion on the rotor 4 side is a downward hole 36, and an upward projection 37 on the wave washer 10 side is inserted into this, and the tip of the projection 37 is inserted into the inner wall surface of the hole 36. You may make it press-contact. In this case, the size of the hole 36 is determined so that the projection 37 can move in the axial direction within the hole 36 when the wave washer 10 is pressed.

In the above embodiment, the wave washer is used.
As shown in FIG. 3, two projections were formed assuming that the rotor 10 was in contact with the rotor 4 at two points. However, when a corrugated washer that contacted at three or more points was used, three or more projections were provided. Corresponding to this, an engaging portion may be provided on the rotor side. In the above embodiment, the low side of the wave washer 10 is abutted against the step of the bush 2. However, the wave washer 10 may be abutted on the case 1 or the resistor substrate 3, and the non-rotating Parts.

Further, the case 1, the bush 2, and the resistor substrate 3 may be integrally formed as a non-rotating member.

[0022]

As described above, according to the present invention, since the wave washer rotates integrally with the rotor, the relative position becomes constant and the effect of preventing the contact pressure of the brush from varying can be obtained. Further, an effect is obtained that the wave washer can be easily assembled at an ideal position.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a bottom view of the rotor and the wave washer of the embodiment.

FIG. 3 is a perspective view of the wave washer of the embodiment.

FIG. 4 is a partially enlarged view of the wave washer of the embodiment.

FIG. 5 is a view showing another embodiment of the protrusion;

FIG. 6 is a diagram showing another embodiment of the engaging portion.

FIG. 7 is a view showing another embodiment of the projection and the engagement portion.

FIG. 8 is a longitudinal sectional view showing a conventional example.

FIG. 9 is a bottom view of the rotor and the wave washer of the conventional example.

FIG. 10 is a perspective view of the conventional wave washer according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Bush 3 Resistor board 4 Rotor 5 Fixing ring 6 Guide contact 7 Bracket 8 Current collecting brush 9 Resistance brush 10 Wave washer 21 Protrusion 22 Enlarged part 23 Engagement part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-118621 (JP, A) JP-A 60-134110 (JP, U) JP-A 3-114550 (JP, U) JP-A 4-118 69657 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G01B 7/30 F02B 77/08

Claims (1)

(57) [Scope of request for utility model registration] A fixedly disposed resistor substrate and a bearing member disposed at a right angle to the resistor substrate are rotatably supported, rotate in conjunction with a throttle valve shaft, and are provided in a predetermined direction in the axial direction of the bearing member. A rotor that can be moved a distance, a brush attached to the rotor and sliding on the resistor substrate, and a brush inserted into the outer periphery of the bearing member, interposed between the non-rotating portion and the rotor, and A throttle opening detection device including an annular wave washer for urging the bearing member in an axial direction, wherein a protrusion is formed on an outer peripheral portion of the wave washer, and the rotor is engaged with the protrusion in a rotational direction. A throttle opening detection device characterized by forming a part.