JPH08285516A - Detecting device of rotational position - Google Patents

Abstract

PURPOSE: To facilitate assembling and also to improve precision by a simple construction having a reduced number of components, wherein one end part of a rotor of which the shaft and the main body are molded of synthetic resin integrally is supported axially and rotatably by a housing. CONSTITUTION: In a detecting device 1 of a rotational position, the rotation of a shaft of a throttle valve is transmitted to the end part of a shaft 46 of a rotor 40 through the intermediary of a lever and thereby the rotor 40 is rotated. The rotor 40 is molded of synthetic resin integrally and the shaft 46 is fitted axially to a bearing part 61 of a housing 60 and rotated. On the base side of a cover member 50, a resistance circuit face 59 is formed by screen printing or the like. A contact face 44 having a contactor 23 coming into contact with the resistance circuit face 59 is molded integrally with the main body 43 of the rotor 40 so that it is disposed opposite to the resistance circuit face 59, and one end part of the rotor 40 is supported axially by the bearing part 61 of the housing 60, while the other end part of the rotor 40 is supported axially by the cover member 50. According to this constitution, the number of components is reduced and an assembling error among members at the time of assembling is lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational position detecting device for converting a rotational angle of a throttle valve or the like into a resistance value.

[0002]

2. Description of the Related Art A rotational position detecting device for detecting the opening of a throttle valve or the like transmits the movement of an object to be detected such as a valve to a rotor and converts the amount of rotation of the rotor into a resistance value. For example, as shown in FIG.
The substrate 91 having the resistance circuit surface and the rotor 92 having the contacts 931 and 932 in contact with the resistance circuit surface are placed inside the housing 94.

The rotor 92 is mechanically connected to the object to be detected in some relationship, and is rotationally driven by, for example, a lever 941 or the like. Then, as shown in FIG. 15, the first contactor 931 is connected to the resistors 911, 91 on the resistance circuit surface.
It slides on 2, and changes the resistance value between terminals 951 and 952 according to the amount of rotation.

The second contactor 932 can short-circuit or open between the conductors 913 and 914 depending on the rotational position of the rotor 92, thereby detecting a specific rotational position (detection terminals 953 and 954). In FIG. 15, reference numeral 943 indicates the contact 9 of the rotor 92 by an appropriate contact pressure.
It is a coil spring that presses 31, 932 against the resistance circuit surface (for details, see Japanese Utility Model Laid-Open No. 62-97909).

In order to detect the rotational position with high accuracy, it is important to accurately adjust the positional relationship between the resistance circuit surface and the contacts 931 and 932. The rotor 92
The shaft 921 and the bearing portion 942 of the housing 94 are made of a metal material, and the main body 922 of the rotor 92 to which the contacts 931 and 932 are attached is made of an insulating material.
Then, the rotor 92 fixes the shaft 921 to the main body 922 by insert molding, screwing, or the like.

The contacts 931 and 932 are shown in FIG.
As shown in FIG. 17, it is fixed to the main body 922 of the rotor 92 by using snap washers 934 and the like. The resistive circuit surface is a substrate 91 made of an insulating material such as ceramic or resin.
Formed on top.

On the other hand, the substrate 91, as shown in FIG.
It is fixed to the cover 97 via the packing 971. The resistance circuit surface of the substrate 91 is connected to the terminals 951 to 954 via the conductive member 96 and the like. It should be noted that, as a terminal having another structure, as shown in FIG. 18, there is also a structure in which a conductive member 990 contacting the resistance circuit surface is welded to the terminal 960. The conductive member 990 is made of an elastic member, and presses the top portion 991 against the resistance circuit surface by the elastic restoring force generated when pressed.

As another rotational position detecting device having another structure, there is a type in which a resistor circuit surface is formed on the rotor side and a contact is provided on a plate member fixed to the housing (Japanese Patent Laid-Open No. 62-182449). (See Japanese Patent Publication).

Further, the connection structure of the rotor 92 with the object to be detected such as the shaft of the throttle valve is not limited to the structure in which the lever 941 fixed to the shaft 921 is rotated by a valve shaft (not shown) as described above. There is known a structure in which a fitting hole into which the valve shaft is fitted is provided in the axial center portion of the. Then, the lower portion of the housing 94 is fitted into, for example, a recess in the outer wall of the body of the throttle valve (see Japanese Patent Laid-Open No. 4-112930). That is, the rotational position detecting device 9 is stably attached to the body of the throttle valve by a method such as providing a tapered convex portion on the lower part of the housing 94 and providing a fitting concave portion having the same taper on the valve body side.

[0010]

However, the conventional rotational position detecting device has the following problems. That is, the number of parts that determine the positional relationship between the resistance circuit surface and the contact is large, and it takes time to assemble and adjust.
If the number of parts is large, the positional relationship between the resistance circuit surface and the contactor is likely to change due to the dimensional error of each part, resulting in large variations. In addition, the cost of parts and the number of man-hours for assembling increase, resulting in an increase in cost. In view of the above conventional problems, the present invention has an object to provide a rotary position detecting device having a simple configuration with a small number of parts, easy to assemble, and highly accurate.

[0011]

According to a first aspect of the present invention, there is provided a rotational position detecting device for converting a rotational angle of a shaft into a resistance value, wherein the shaft and the main body are combined. A rotor integrally formed of resin, a housing that rotatably supports one end of the rotor, and a housing fixed to the housing and opposed to the main body of the rotor, while the other end of the rotor is rotatable. The cover member made of a synthetic resin that is axially supported, the resistor circuit surface that is disposed at a right angle to the shaft center of the shaft, and is integrally formed with the cover member, and the resistor circuit surface that is disposed so as to face the resistor circuit surface. And a contact surface having a contactor that is formed integrally with the main body of the device and contacts the resistance circuit surface.

According to a second aspect of the present invention, the rotational position detecting device faces the first aspect of the present invention by forming a concave portion or a convex portion on one of the resistance circuit surface of the member and the contact surface of the main body of the rotor. A convex portion or a concave portion that engages with the concave portion or the convex portion is formed on the contact surface or the resistance circuit surface, and the other end of the rotor is pivotally supported. According to a third aspect of the present invention, in the rotational position detecting device according to the second aspect, a concave portion is formed on the resistance circuit surface and a convex portion is formed on the contact surface.

A rotational position detecting device according to a fourth aspect of the present invention has an external connection terminal at one end and a contact portion for contacting the resistance surface at the other end, and the external connection terminal and the contact portion are integrally formed. The contact portion is formed of an elastically deformable conductive member, and is pressed against the resistance circuit surface by a restoring force caused by the elastic deformation.

Next, the rotational position detecting device according to claim 5 is
A rotary position detecting device for converting a rotation angle of a shaft into a resistance value, the rotor including a shaft and a main body integrally formed of synthetic resin, a housing rotatably supporting one end of the rotor, and the housing. A cover member made of synthetic resin that is fixed to the main body of the rotor and rotatably supports the other end of the rotor, and is disposed at a right angle to the axial center of the shaft. A resistance circuit surface formed integrally with the main body of the above, and a contact surface that is disposed facing the resistance circuit surface and that is formed integrally with the cover member and that has a contact that contacts the resistance circuit surface. It is characterized by having.

According to a sixth aspect of the present invention, in the rotation detecting device according to the fifth aspect, a concave portion or a convex portion is formed on one of the resistance circuit surface of the cover member and the contact surface of the main body of the rotor,
A convex portion or a concave portion that engages with the concave portion or the convex portion is formed on the opposing contact surface or the resistance circuit surface, and the other end of the rotor is pivotally supported. According to a seventh aspect of the present invention, the rotational position detecting device is characterized in that a concave portion is formed on the resistance circuit surface and a convex portion is formed on the contact surface.

On the other hand, the rotation position detecting device according to the present invention is a rotation position detecting device for converting the rotation angle of the shaft into a resistance value, wherein the shaft and the main body are integrally molded with a synthetic resin and the main body has a resistance circuit surface. A rotor forming
The housing is provided with a housing that rotatably supports the rotor and a cover member of synthetic resin that is fixed to the housing and faces the body of the rotor. One end of the cover member has an external connection terminal. It is characterized in that a terminal contact integrally formed of a conductive member is mounted, the other end of which is in contact with the resistance circuit surface.

According to a ninth aspect of the present invention, in the rotational position detecting device according to the eighth aspect, the rotor main body is constructed by mounting a substrate having a resistance circuit surface on a body made of synthetic resin integrated with a shaft. It is characterized by being. Further, the rotational position detecting device according to claim 10 is characterized in that, in any one of claims 1 to 9, the shaft of the rotor is mechanically connected to the shaft of the throttle valve. To do. The rotational position detecting device according to claim 11 is the device according to claim 1.
The shaft of the rotor is mechanically coupled to the shaft of the throttle valve according to any one of claims 10 to 10.

A rotational position detecting device according to a twelfth aspect is a rotational position detecting device for converting a rotational angle of a shaft into a resistance value, wherein the shaft and the main body are integrally molded with synthetic resin, and one end portion of the rotor. And a synthetic resin housing that rotatably supports the
A cover member made of synthetic resin, which is placed opposite to the main body of the rotor and pivotally supports the other end of the rotor;
The resistor circuit surface is formed at a right angle to the axis of the shaft, is arranged opposite to the resistance circuit surface formed on the cover member, is formed on the main body of the rotor, and is formed on the resistance circuit surface. And a contact surface having a contact for contacting.

[0019]

According to the rotational position detecting device of the present invention, the rotor shaft and the main body are integrally formed of synthetic resin, and the cover member facing the main body of the rotor is also formed of synthetic resin. Since it is done,
The number of parts is small, the assembly manufacturing process is also reduced,
It is cheap.

Further, a resistance circuit surface is integrally formed on the cover member, and a contact surface having a contactor for contacting the resistance circuit surface is integrally formed with the main body of the rotor so as to face the resistance circuit surface. In addition, since one end of the rotor is rotatably supported by the housing and the other end of the rotor is rotatably supported by the cover member, a small number of parts can reduce the assembly error between the members at the time of assembly and reduce the resistance circuit surface. It is possible to prevent the contact elements from being displaced, and further, since the rotor is axially supported by the two members of the housing and the cover member, tilting during rotation of the rotor is prevented and the resistance circuit surface and the contact surface are prevented. The accuracy of the detected position detection can be improved. According to the rotational position detecting device of the second or third aspect, the resistance circuit surface of the cover member and the contact surface of the main body of the rotor are formed with the concave portions or the convex portions that engage with each other. Alignment between the circuit surface and the contact surface is very easy.

According to the rotation position detecting device of the fourth aspect, the external connection terminal is provided at one end, the contact portion for contacting the resistance surface is provided at the other end, and the external connection terminal and the contact portion are integrally formed. The terminal contact is provided, and the contact portion is formed by the elastically deformable conductive member, and is pressed against the resistance circuit surface by the restoring force caused by the elastic deformation.
Contact pressure above a certain level can be obtained, and contact reliability can be improved. That is, the failure rate can be significantly reduced.

Further, by simply pressing the contact portion of the terminal contact with the cover member, conduction with the resistance circuit surface can be easily obtained, and between the terminal contact and the resistance circuit surface, there is conduction as a separate member as in the prior art. No parts needed,
Not only can the number of parts be reduced, but the number of assembly steps can also be reduced.

According to the rotational position detecting device of the fifth aspect, the rotor shaft and the main body are integrally molded of synthetic resin, and the cover member facing the main body of the rotor is also formed of synthetic resin. Therefore, the number of parts is small, the manufacturing process for assembly is small, and it is inexpensive. Further, a resistance circuit surface is integrally formed on the rotor body, and a contact surface having a contactor for contacting the resistance circuit surface is integrally formed with the cover member so as to be opposed to the resistance circuit surface, and the rotor circuit surface is integrally formed. Since one end is supported by the housing by hand and the other end of the rotor is supported by the cover member, the assembly error between the members during assembly can be reduced by the small number of parts, and the resistance circuit surface and the contact Can be prevented from shifting, and since the rotor is axially supported by the housing and the cover member, tilting during rotation of the rotor can be prevented and detection can be performed on the resistance circuit surface and the contact surface. The accuracy of position detection can be improved.

According to the rotational position detecting device of the sixth or seventh aspect, since the concave portion or the convex portion that engages with each other is formed on the resistance circuit surface of the cover member and the contact surface of the main body of the rotor, the assembly is assembled. It is very easy to align the resistance circuit surface and the contact surface at this time.

According to the rotational position detecting device of the eighth aspect, the integrally formed terminal contact serves as both the external connection terminal and the contactor to the resistance circuit surface. That is, since the external connection terminal and the contactor are not separate bodies as in the conventional rotational position detecting device but are integrated, the number of parts is reduced and the assembly is easy. Further, since the rotor and the cover member are main parts made of synthetic resin, they are easy to mold and can be manufactured at low cost. Further, according to the rotational position detecting device of the ninth aspect, since the resistance circuit surface is formed on a separate substrate, a substrate manufacturing process (for example, resistance printing or plating process) independent of the shaft or body processing process. Etc.), a complicated circuit or the like can be freely formed.

According to the rotational position detecting device of claim 10,
Further, since the cover member and the housing are made of the same material and the two members are joined by welding, there is no gap between the two members and the airtightness is improved. Then, the sealing member (for example, the sealing member 209 in FIGS. 5, 6, and 10) that seals between the both members becomes unnecessary. Further, as described in claim 10, the rotational position detecting device can be mechanically connected to the shaft of the throttle valve to be used as a throttle valve opening detector.

According to the rotation position detecting device of claim 12,
Since the rotor shaft and the main body are integrally formed of synthetic resin, and the cover member facing the main body of the rotor is also formed of synthetic resin, the number of parts is small and the assembly manufacturing process is reduced. ， It is cheap. Further, the resistance circuit surface is formed on the cover member, and the contact surface having a contactor contacting the resistance circuit surface is pivotally supported at the other end of the rotor by the cover member so that the resistance circuit surface is arranged to face the resistance circuit surface. Since the number of parts is small, the assembly error between the members at the time of assembly can be reduced, and the position of the resistor circuit surface and the contact can be prevented from shifting, and further, the rotor is composed of the housing and the cover member. Since it is supported, inclination of the rotor during rotation is prevented, and the accuracy of position detection detected by the resistance circuit surface and the contact surface can be improved.

[0028]

【Example】

Embodiment 1 An embodiment of the rotational position detecting device of the present invention will be described with reference to FIGS. In this example, as shown in FIG.
The rotation position detecting device 1 converts the rotation angle of 6 into a resistance value. The rotational position detecting device 1 includes a rotor 40 in which a shaft 46 and a main body 43 are integrally molded of synthetic resin, and a rotor 4
Housing 60 made of synthetic resin that rotatably supports a shaft 46 of No. 0, and a rotor 40 fixed to the housing 60.
And a cover member 50 made of synthetic resin opposite to the main body 43.

The cover member 50 is integrally formed with a resistance circuit surface 59 which is arranged at a right angle to the axis of the shaft 46. On the other hand, the main body 43 of the rotor 40 has a resistance circuit surface 5
A contact surface 44 is formed in which the contact 23 that contacts 9 is attached and is arranged to face the resistance circuit surface 59. A cylindrical recess 57 having the same axis as the shaft 46 is formed on the resistance circuit surface 59, and a protrusion 48 that fits into the recess 57 is formed on the contact surface 44. Further, the cover member 50 and the housing 60 are made of the same material, and both members 5
0 and 60 are joined by ultrasonic welding. The shaft 46 of the rotor 40 is made of a liquid crystal polymer, and is arranged so that the crystal direction of the liquid crystal polymer is perpendicular to the rotational movement direction of the shaft 46.

Each of these will be described in detail below. The rotational position detecting device 1 of this example is an opening sensor of a throttle valve of an automobile (not shown), and transmits the rotation of the throttle valve shaft to the end of the shaft 46 of the rotor 40 via a lever or the like to rotate the rotor 40. It is something to move. As shown in FIG. 1, the rotor 40 is integrally molded of synthetic resin, and the shaft 46 is attached to the bearing portion 6 of the housing 60.
It is attached to 1 and pivoted. On the bottom surface of the cover member 50,
The resistance circuit surface 59 is formed by screen printing or the like.

The resistance circuit surface 59 has a resistance surface, a ground conductor surface, and a power supply conductor surface (not shown) (see FIG. 1).
6), and a cylindrical recess 57 is formed in the center. A ring-shaped groove 571 is formed around the recess 57.
Are formed. The cover member 20 is joined to the housing 60 by ultrasonic welding.

The main body 43 of the rotor 40 has a contact surface 44 on the upper surface of which the contact 23 is mounted. A cylindrical convex portion 48 and a ring-shaped annular protrusion 481 are provided in the center of the contact surface 44.
Are formed. The convex portion 48 fits into the concave portion 57,
The annular protrusion 481 fits in the groove 571. The contact 23 contacts the resistance surface of the resistance circuit surface 59, the ground conductor surface, or the power supply conductor surface.

The contactor 23 is formed of a spring member having elasticity and contacts the resistance circuit surface 59 with a constant contact pressure. A coil spring 68 is interposed between the lower surface of the main body 43 of the rotor 40 and the upper surface of the bearing portion 61 of the housing 60.
Biases the rotor 40 toward the resistance circuit side.

The housing 60 is a member made of synthetic resin to which the terminal plate 69 is attached by insert molding, and has a bearing portion 61 for supporting the shaft 46 of the rotor 40 in the lower part. As shown in FIG. 2, the terminal board (terminal contact) 69 is formed by bending a single plate-like body by press working, and forms a contact portion 691 in contact with the end of the resistance circuit surface 59 and the outside. And a terminal 692. Contact part 69
1 has a curved surface shape that is easily elastically deformed, and is mounted inside the housing 60 in a state of being elastically deformed so as to be crushed.
Pressure contact with the signal output end of.

Next, the function and effect of this example will be described. Since the shaft 46 of the rotor 40 and the main body 43 are integrally formed of synthetic resin, and the cover member 50 arranged so as to face the main body 43 of the rotor 40 is also formed of synthetic resin, the number of parts is small and the assembly is easy. The manufacturing process is also reduced and it is inexpensive.

Further, the resistance circuit surface 59 is provided on the cover member 50.
And a contact 23 that contacts the resistance circuit surface 59 so as to face the resistance circuit surface 50.
Is formed integrally with the main body 43 of the rotor 40, one end of the rotor 40 is pivotally supported by the bearing portion 61 of the housing 60, and the other end of the rotor 40 is pivotally supported by the cover member 50. Therefore, due to the small number of parts, the assembly error between the members at the time of assembly can be reduced, and the position of the resistance circuit surface 59 and the contact 23 can be prevented from being displaced. Since the shaft is supported by the two members, tilting of the rotor 40 during rotation is prevented, and the resistance circuit surface 59
The accuracy of position detection detected by the contact surface 23 can be improved.

Further, since the concave portion 57 and the columnar convex portion 48 are formed on the resistance circuit surface 59 of the cover member 50 and the contact surface 44 of the main body 43 of the rotor 40, the resistance circuit surface 59 at the time of assembly is The alignment between the contact surfaces 44 is very easy. In addition, the cover member 50 and the housing 6
Since 0 is integrally joined by ultrasonic welding,
A member that seals between the two members 50 and 60 (reference numeral 2 in FIG.
09) is unnecessary and the number of parts can be reduced.

Further, the terminal plate (terminal contact) 6
As shown in FIG. 2, reference numeral 9 denotes a contact portion 6 that contacts the resistance circuit surface.
91 and the external terminal 692 are integrated, and can be formed by a series of press workings. Therefore, there is no need to assemble or weld both members 691 and 692, the number of parts is small, and the cost is low. As described above, according to the present embodiment, it is possible to provide the rotational position detecting device 1 having a simple configuration with a smaller number of parts than the conventional device, easy to assemble, and highly accurate.

Example 2 In this example, as shown in FIGS.
The stopper 42 of the spring 68 is attached to the main body 42 of the rotor 40.
This is another embodiment in which 0 is provided. That is, the main body 42 is provided with the stopper 420 protruding to the outer peripheral side,
The second coil 682 of the spring 68 has a stopper 420.
The first coil 681 fixed to the end of the main body 42 does not come into contact with the lower surface of the first coil 681.

Therefore, when the spring 68 expands and contracts, sliding friction does not occur between the coils 681 and 682,
Metal abrasion powder generated by friction does not scatter. As a result, sliding wear of the resistance circuit surface 59 due to the adhesion of the metal abrasion powder is suppressed, and the life and reliability of the rotational position detecting device 1 are improved. 3 and 4, reference numeral 680
Is a locking end of the spring 68 to the main body 42, reference numeral 235 is a contact holding pin, and reference numeral 425 is a meat-thickened portion (lacking portion). Others are the same as in the first embodiment.

Embodiment 3 This embodiment is another embodiment in which the shape of each member is changed in Embodiment 1. In this example, as shown in FIG. 5, a rotor 12 in which a shaft 160 and a main body 130 are integrally molded with a synthetic resin, a synthetic resin housing 310 that supports the shaft 160, and a synthetic resin fixed to the housing 310. The cover member 210 of FIG.

A resistance circuit surface 194 is formed on the cover member 210, and the resistance circuit surface 1 is formed on the main body 130 of the rotor 12.
A contact surface 226 having a contact 23 that contacts 94 is formed. Then, the concave portion 270 is formed on the resistor circuit surface 194.
The contact surface 226 is formed with a convex portion 280 that fits into the concave portion 270.

On the other hand, the housing 310 has a terminal plate 39
0 is insert-molded, and the terminal plate 390 is connected to the resistance circuit surface 194 via a conductor 395 having elasticity. A return spring 38 is provided between the housing 310 and the rotor 12. Reference numeral 149 is a locking portion of the spring 38. The cover member 210 is a member separate from the housing 310, and therefore, the seal member 209 is provided between the members 210 and 310.
Is interposed.

In the rotational position detecting device 1 of this example, the rotor 12 is integrally molded of synthetic resin, and the number of parts is smaller than that of the rotor of the conventional device. Therefore, the number of manufacturing steps of parts and assembly is small, and the cost is lower than that of the conventional device.
Since the concave portion 270 and the columnar convex portion 280 which are fitted to each other are formed on the resistance circuit surface 194 and the contact surface 226, the resistance circuit surface 194 and the contact surface 226 are easily assembled, and the resistance at the time of assembling and after the assembling A positional deviation does not occur between the circuit surface 194 and the contact surface 226, and a highly accurate rotational position detecting device can be obtained. As described above, according to this example, it is possible to provide a rotary position detecting device having a simple configuration with a small number of parts, easy to assemble, and highly accurate.

Embodiment 4 As shown in FIG. 6, this embodiment is a rotational position detecting device 1 for converting the rotational angle of the shaft 16 into a resistance value. The rotational position detecting device 1 includes a rotor 10 in which a shaft 16 and a main body 13 are integrally molded of synthetic resin, and a shaft 1 of the rotor 10.
Housing 30 made of synthetic resin that rotatably supports 6
And a cover member 20 made of synthetic resin, which is fixed to the housing 30 and faces the main body 13 of the rotor 10.

The main body 13 of the rotor 10 has a shaft 16
A resistance circuit surface 195 arranged at a right angle to the axis C of is formed. On the other hand, the cover member 20 has a resistance circuit surface 19
5, a contact face 23 that contacts 5 is attached, and a detection face 225 is formed to face the resistance circuit face 195. And
The resistance circuit surface 195 is formed with a cylindrical recess 27 having the same axis C as the shaft 16, and the detection surface 225 has
A convex portion 28 that fits into the concave portion 27 is formed.

Each of these will be described in detail below. The rotational position detection device 1 of this example is an opening sensor for a throttle valve of an automobile (not shown), which transmits the rotation of the throttle valve shaft to the end of the shaft 16 of the rotor 10 via a lever or the like to rotate the rotor 10. It is something to move.

As shown in FIG. 7, the rotor 10 is integrally formed of synthetic resin. Further, an O-ring 301 is arranged between the rotor 10 and the housing 30.
The rotor 10 is axially supported by the bearing portion 31 of the housing 30. A resistor circuit surface 195 is formed on the upper surface of the main body 13 of the rotor 10 by screen printing or the like.

The resistance circuit surface 195, as shown in FIG.
It has a resistance surface 196, a ground conductor surface 197, and a power supply conductor surface 198, and a cylindrical recess 27 is formed in the center. On the other hand, the cover member 20 is attached to the housing 30 via a seal member 209 such as rubber as shown in FIG.

As shown in FIG. 8, the cover member 20 has a detection surface 225 to which the contact 23 is attached.
A cylindrical convex portion 28 is formed in the central portion of the. The convex portion 28 fits into the concave portion 27. The detection surface 225 is formed integrally with the cover member 20. Contact 23
Contacts each surface 196-198 of the resistive circuit surface 195.

The contactor 23 is formed by a spring member having elasticity, contacts the resistance circuit surface 195 with a constant contact pressure, and the other end contacts a terminal plate 39 (FIG. 1) described later. . The contactor 23 is attached to the cover member 2 by a fixing member 239 as shown in FIGS. 6 and 8, but other methods include an insert molding method and the snap washer method (see FIG. 16).

The housing 30 is a member made of synthetic resin to which the terminal plate 39 is attached by insert molding, and has a bearing 309 for supporting the shaft 16 of the rotor 10 in the middle thereof. Then, the cover member 22 is fixed to the upper portion by a method such as heat staking.

Next, the function and effect of this example will be described. Since the shaft 16 and the main body 13 of the rotor 10 are integrally molded of synthetic resin, and the cover member 20 arranged to face the main body 13 of the rotor 10 is also formed of synthetic resin, the number of parts is small and the assembly is easy. The manufacturing process is also reduced and it is inexpensive.

Further, the resistance circuit surface 195 is directly screen-printed on the main body 13 of the rotor 10, and the resistance circuit surface 195 is arranged so as to be opposed to the resistance circuit surface 195.
A detection surface 225 having a contactor 23 that contacts with the cover member 20, and one end of the rotor 10 is rotatably supported by a bearing portion 31 of the housing 30, and the other end of the rotor 10 is rotatably supported by the cover member 20. Since they are supported, the small number of parts can reduce the assembly error between the members at the time of assembly, and can prevent the resistance circuit surface 195 and the contact 23 from being displaced from each other. Since the cover member 20 is axially supported by the two members, the inclination of the rotor 10 during rotation is prevented, and the accuracy of position detection detected by the resistance circuit surface 195 and the detection surface 225 can be improved. As described above, according to this example, it is possible to provide a rotational position detection device having a simple configuration with a small number of parts, easy to assemble, and highly accurate.

Embodiment 5 In this embodiment, as shown in FIG. 9, the contact 230 is fixed to the terminal plate 390 by welding or the like in Embodiment 4, and
This is another embodiment in which a return spring 38 is provided. The return spring 38 fixes one end 381 to the housing 300 and the other end 382 to the main body 130 of the rotor 100, and returns the rotated rotor 100 to the original position. Further, the rotor 100 is pressed toward the cover member 200 by a predetermined biasing force.

Further, the cover member 200 is the housing 30.
No. 0 is fixed by ultrasonic welding, and a seal member (reference numeral 209 in FIG. 5) is unnecessary. Then, the contactor 230 is fixed to the terminal plate 390 by welding or the like, and a fixing member (FIG. 6, FIG.
Reference numeral 239) is unnecessary. In the figure, reference numeral 302
Is a hole-shaped fitting portion for fitting with a rotation target object (valve shaft) not shown. Others are the same as in the fourth embodiment.

Embodiment 6 As shown in FIG. 10, this embodiment is another embodiment in which the contact portion of the terminal plate 391 with the contact 23 is made to have elasticity as shown in FIG. . That is, the end portion of the terminal plate 391 (terminal contact) is formed with a curved portion 393 so as to have elasticity, and the pressing force of the curved portion 393 electrically connects the contact 23. Others are the same as in the first embodiment.

Embodiment 7 In this embodiment, as shown in FIG. 11, the terminal contactor 25 in which the terminal plate and the contactor are integrated is used in Embodiment 5, and the rotor 11 and the cover member 21 are provided with recesses and protrusions. This is another embodiment in which the above is not provided.

That is, the cover member 21 has the structure shown in FIGS.
As shown in FIG. 2, the terminal contactor 25 in which the terminal plate (external connection terminal) and the contactor are integrated is insert-molded, and a convex portion is not provided on the surface facing the rotor 11. Further, as shown in FIG. 13, the resistance circuit surface 195 of the rotor 11 has a power supply conductor surface 199 formed in the center thereof, and no recess is provided. Further, as shown in FIG. 11, the main body 14 of the rotor 11 is provided with a locking member 149 for locking the return spring 38.

Since the rotational position detecting device 1 of this embodiment uses the terminal contactor 25 in which the external connection terminals and the contacts are integrated, the number of parts is small and the number of assembling steps is also small. Further, since the rotor 11, the housing 300, and the cover member 21 are all integrally molded of synthetic resin, they are easy to mold and can be manufactured at low cost. Others are the same as in the fifth embodiment.

[Brief description of drawings]

FIG. 1 is a cross-sectional view (front view) of a rotation position detecting device according to a first embodiment.

FIG. 2 is a perspective view of a terminal plate of the rotation position detecting device according to the first embodiment.

FIG. 3 is a front view of a rotor of the rotation position detecting device according to the second embodiment.

FIG. 4 is a plan view of a rotor of the rotation position detecting device according to the second embodiment.

FIG. 5 is a sectional view (front view) of a rotation position detecting device according to a third embodiment.

FIG. 6 is a sectional view (front view) of a rotation position detecting device according to a fourth embodiment.

FIG. 7 is a plan view of a rotor of the rotation position detecting device according to the fourth embodiment.

FIG. 8 is a bottom view of the cover member of the rotation position detecting device according to the fourth embodiment.

FIG. 9 is a sectional view (front view) of a rotation position detecting device according to a fifth embodiment.

FIG. 10 is a sectional view (front view) of a rotation position detecting device according to a sixth embodiment.

FIG. 11 is a sectional view (front view) of a rotation position detecting device according to a seventh embodiment.

12 is a cross-sectional view taken along line X1-X1 of FIG.

FIG. 13 is a plan view of a rotor of the rotation position detecting device according to the seventh embodiment.

FIG. 14 is a cross-sectional view (front view) of a conventional rotational position detecting device.

15 is a cross-sectional view taken along line X2-X2 of FIG.

FIG. 16 is a plan view showing a fixed state of contacts in a conventional rotational position detecting device.

FIG. 17 is a sectional view showing a fixed state of a contact in another conventional rotational position detecting device.

FIG. 18 is a perspective view of a terminal in another conventional rotational position detecting device.

[Explanation of symbols]

1. ． ． Rotational position detection device, 10, 100, 11, 12, 40. ． ． Rotor, 16, 160, 46. ． ． Shaft, 194, 195, 59. ． ． Resistor circuit surface, 20, 200, 21, 210, 22, 50. ． ． Cover member, 23. ． ． Contactor, 27, 57. ． ． Recess, 28, 48. ． ． Convex part, 30, 60. ． ． Housing, 44. ． ． Contact surface,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Ouchi 1-1, Showa-cho, Kariya city, Aichi Prefecture Nihon Denso Co., Ltd. (72) Inventor Takahiro Tamura 1-1-chome, Showa town, Kariya city, Aichi prefecture Co., Ltd. (72) Inventor Akira Kondo 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihon Denso Co., Ltd. (72) Inventor, Haruhiko Suzuki, 1-1, Showa-machi, Kariya city, Aichi prefecture, Nihondenso Co., Ltd.

Claims (12)

[Claims] 1. A rotation position detecting device for converting a rotation angle of a shaft into a resistance value, wherein a rotor integrally formed with a shaft and a main body by a synthetic resin, and one end of the rotor is rotatably supported. A housing, a cover member made of synthetic resin fixed to the housing, opposed to the main body of the rotor and pivotally supporting the other end of the rotor, and arranged at a right angle to the axis of the shaft. At the same time, a resistance circuit surface formed integrally with the cover member,
And a contact surface that is disposed so as to face the resistance circuit surface and that is formed integrally with the main body of the rotor and that has a contactor that contacts the resistance circuit surface. 2. The recess or the protrusion is formed on one of the resistance circuit surface of the cover member or the contact surface of the main body of the rotor according to claim 1, and the contact surface or the resistance circuit surface opposite to each other,
Forming a convex portion or a concave portion that engages with the concave portion or the convex portion,
A rotational position detecting device, which supports the other end of the rotor. 3. The rotational position detecting device according to claim 2, wherein a concave portion is formed on the resistance circuit surface and a convex portion is formed on the contact surface. 4. The external connection terminal according to claim 1, wherein the external connection terminal is provided at one end, and the contact portion is in contact with the resistance surface at the other end. And a terminal contact integrally formed with the contact portion, wherein the contact portion is formed of an elastically deformable conductive member, and is pressed against the resistance circuit surface by a restoring force caused by the elastic deformation. . 5. A rotational position detecting device for converting a rotational angle of a shaft into a resistance value, wherein a rotor integrally formed with a shaft and a main body by a synthetic resin, and one end of the rotor is rotatably supported. A housing, a cover member made of a synthetic resin fixed to the housing, opposed to the main body of the rotor and pivotally supporting the other end of the rotor, and arranged at right angles to the axis of the shaft. And a resistance circuit surface integrally formed with the main body of the rotor, and a contactor that is disposed so as to face the resistance circuit surface and that is integrally formed with the cover member and that contacts the resistance circuit surface. A rotational position detecting device comprising: a contact surface. 6. The recess or the protrusion is formed on one of the resistance circuit surface of the cover member or the contact surface of the main body of the rotor according to claim 5, and the contact surface or the resistance circuit surface facing each other,
Forming a convex portion or a concave portion that engages with the concave portion or the convex portion,
A rotational position detecting device, which supports the other end of the rotor. 7. The rotational position detecting device according to claim 6, wherein a concave portion is formed on the resistance circuit surface and a convex portion is formed on the contact surface. 8. A rotation position detecting device for converting a rotation angle of a shaft into a resistance value, wherein the shaft and the main body are integrally molded of synthetic resin and a resistance circuit surface is formed on the main body, and the rotor is rotated. The housing is provided with a movably supported shaft and a cover member of synthetic resin fixed to the housing and opposed to the main body of the rotor. One end of the cover member forms an external connection terminal, and the other. A rotary position detecting device, characterized in that a terminal contact integrally formed of a conductive member, the end of which is in contact with the resistance circuit surface, is mounted. 9. The rotational position detecting device according to claim 8, wherein the main body of the rotor has a body having a resistance circuit surface mounted on a body made of synthetic resin integrated with a shaft. 10. The rotational position according to claim 1, wherein the cover member and the housing are made of the same material, and both members are welded and joined to each other. Detection device. 11. The rotational position detecting device according to claim 1, wherein the rotor shaft is mechanically connected to the throttle valve shaft. 12. A rotary position detecting device for converting a rotation angle of a shaft into a resistance value, wherein a rotor integrally formed with a shaft and a main body by a synthetic resin and one end of the rotor is rotatably supported. A synthetic resin housing, a synthetic resin cover member fixed to the housing, opposed to the rotor body, and pivotally supporting the other end of the rotor, and a right angle to the shaft center. A contact having a resistance circuit surface formed on the cover member, and a contact arranged on the resistance circuit surface opposite to the resistance circuit surface and formed on the main body of the rotor and in contact with the resistance circuit surface. A rotational position detecting device comprising: a surface.