Throttle device

Abstract

To enable the use of a different motor with a larger outer diameter than the existing motor by housing it in the existing housing, without having to construct a new housing. [Solution] The throttle device 1 comprises a valve body 4, a valve stem 5 to which the valve body 4 is fixed, a motor 6 for rotating the valve stem 5, a housing 8 for housing the motor 6, and a hole 11 for assembling the motor 6 into the housing 8. The hole 11 includes a coaxially arranged large-diameter housing portion 12 and a small-diameter housing portion 13. The minimum wall thickness TK1 between the inner circumferential surface of the large-diameter housing portion 12 and the outer circumferential surface of the housing 8 is the same as or thinner than the minimum wall thickness TK2 between the inner circumferential surface of the small-diameter housing portion 13 and the outer circumferential surface of the housing 8.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a throttle device incorporating a motor and driven by the motor.

Background Art

[0002] Conventionally, as this type of technology, for example, a throttle device described in Patent Document 1 below is known. This device includes a valve shaft to which a valve body is fixed, an electric motor that rotates the valve shaft, a housing that houses the motor, and a cover that covers the motor housed in the housing. The housing includes a hole for assembling the motor. The motor assembled in the hole is fixed to the housing via a bracket. The motor has motor terminals. The cover has cover terminals. The bracket has intermediate terminals that connect the motor terminals and the cover terminals. Here, it may be necessary to change the motor of the throttle device to another motor. In this case, even if the position of the motor terminals is different from the position of the motor terminals before the change, the motor terminals can be connected to the cover terminals with the intermediate terminals interposed therebetween. Thereby, another motor can be used for the throttle device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the throttle device described in Patent Document 1, when the physical size of another motor to be changed is larger than the motor before the change, it becomes difficult to accommodate another motor in the hole, and another motor cannot be used. Alternatively, it becomes necessary to newly provide another housing.

[0005] This disclosed technology has been made in view of the above circumstances, and its purpose is to provide a throttle device that allows another motor with a larger outer diameter than the existing motor to be housed and used in the housing without the need to construct a new housing. [Means for solving the problem]

[0006] To achieve the above objective, the technology described in claim 1 is a throttle device comprising a valve body, a valve stem to which the valve body is fixed, an electric motor for rotating the valve stem, a housing for housing the motor, and a hole for assembling the motor into the housing, wherein the hole includes a coaxially arranged large-diameter housing portion and a small-diameter housing portion, and the minimum wall thickness between the inner circumferential surface of the large-diameter housing portion and the outer circumferential surface of the housing is the same as or thinner than the minimum wall thickness between the inner circumferential surface of the small-diameter housing portion and the outer circumferential surface of the housing.

[0007] According to the above technology configuration, a motor is assembled in the hole. In the hole, the minimum wall thickness between the inner surface of the large-diameter housing and the outer surface of the housing is the same as or thinner than the minimum wall thickness between the inner surface of the small-diameter housing and the outer surface of the housing. Therefore, immediately after manufacturing, the outer diameter of the motor assembled in the hole is determined by the inner diameter of the small-diameter housing. If the motor of the throttle device is to be changed to a different motor with a larger outer diameter, it is possible to enlarge the inner diameter of the small-diameter housing to the inner diameter of the large-diameter housing by cutting the inner wall of the small-diameter housing.

[0008] To achieve the above objective, the technology described in claim 2 is characterized in that, in the technology described in claim 1, a step is provided between the inner circumferential surface of the large diameter housing and the inner circumferential surface of the small diameter housing, and the surface of the step has an R shape or a tapered shape.

[0009] According to the configuration of the above technology, in addition to the effects of the technology described in claim 1, a step is provided between the inner surface of the large-diameter housing and the inner surface of the small-diameter housing, so that the inner wall of the small-diameter housing can be cut using the width of the step as a guide. Furthermore, since the surface of the step has an R shape or a tapered shape, the motor is less likely to get caught on the step when assembling the motor into the hole. [Effects of the Invention]

[0010] According to the technology described in claim 1, another motor with a larger outer diameter than the existing motor can be housed and used in the housing without the need to construct a new housing.

[0011] According to the technology described in claim 2, in addition to the effects of the technology described in claim 1, the stepped portion makes it easy to secure cutting allowance for the small diameter housing portion. Furthermore, the surface shape of the stepped portion improves the ease of assembling the motor into the hole. [Brief explanation of the drawing]

[0012] [Figure 1] A perspective view showing an overview of a throttle device according to one embodiment. [Figure 2] Figure 1 is a cross-sectional view showing a motor housing enclosed by a dashed line, relating to one embodiment. [Figure 3] This is a cross-sectional view relating to one embodiment, showing the state after removing the motor, gear mechanism, and cover from Figure 2. [Figure 4] A cross-sectional view relating to one embodiment, showing the state in which the inner circumferential wall of the small diameter housing portion has been cut, similar to Figure 3. [Modes for carrying out the invention]

[0013] The throttle device will be described in detail below with reference to the drawings, with reference to one specific embodiment.

[0014] [Outline of the throttle system configuration] Figure 1 shows an overview of the throttle device 1 in a perspective view. Figure 2 shows a cross-sectional view of the motor housing 3 enclosed by a dashed line in Figure 1. The throttle device 1 in this embodiment is installed in the intake passage of a vehicle engine and is used to adjust the intake air volume.

[0015] As shown in Figures 1 and 2, the throttle device 1 comprises a butterfly-type valve body 4, a valve stem 5 to which the valve body 4 is fixed, an electric motor 6 that rotates the valve stem 5, a gear mechanism 7 that drives and connects the motor 6 to the valve stem 5, a housing 8 that houses the motor 6 and the gear mechanism 7, and a cover 9 that covers the motor 6 and the gear mechanism 7 housed in the housing 8. The housing 8 is die-cast from aluminum or the like. The cover 9 is resin-molded. As can be seen from its appearance, the housing 8 includes a cylindrical motor housing section 3.

[0016] As shown in Figure 2, the motor housing portion 3 of the housing 8 is provided with a bottomed hole 11 for assembling the motor 6. The hole 11 includes a large-diameter housing portion 12 and a small-diameter housing portion 13 arranged coaxially. The large-diameter housing portion 12 is located on the opening side of the hole 11, and the small-diameter housing portion 13 is located on the bottom side. The output shaft 6a of the motor 6 is positioned on the opening side of the hole 11. A recess 13a is provided on the bottom side of the small-diameter housing portion 13. A protrusion 6b is provided on the side opposite to the output shaft 6a of the motor 6. The protrusion 6b of the motor 6 is fitted into the recess 13a. A predetermined gap G1, G2 is provided between the inner circumferential surface of the hole 11 and the outer circumferential surface of the motor 6. In other words, the outer circumference of the motor 6 does not come into contact with the inner circumference of the hole 11. Gap G1 is the gap of the large-diameter housing portion 12, and G2 is the gap of the small-diameter housing portion 13. These gaps G1 and G2 are provided for the purpose of insulating and shock-resistant protection of the motor 6.

[0017] Figure 3 shows a cross-sectional view of the state after removing the motor 6, gear mechanism 7, and cover 9 from Figure 2. As shown in Figures 2 and 3, the minimum wall thickness TK1 between the inner surface of the large-diameter housing 12 and the outer surface of the housing 8 is the same as or thinner than the minimum wall thickness TK2 between the inner surface of the small-diameter housing 13 and the outer surface of the housing 8.

[0018] A step portion 14 is provided between the inner peripheral surface of the large-diameter accommodating portion 12 and the inner peripheral surface of the small-diameter accommodating portion 13. The surface of the step portion 14 has an R shape or a tapered shape. The hole portion 11 is divided into the large-diameter accommodating portion 12 and the small-diameter accommodating portion 13 with the step portion 14 as a boundary. Thus, the provision of the large-diameter accommodating portion 12 and the small-diameter accommodating portion 13 with the step portion 14 as a boundary is intended to assemble another motor having a different outer diameter to the hole portion 11.

[0019] [Regarding the operation and effect of the throttle device] According to the configuration of the throttle device 1 of this embodiment described above, the motor 6 is assembled to the hole portion 11 of the housing 8. Here, in the hole portion 11, the minimum wall thickness TK1 between the inner peripheral surface of the large-diameter accommodating portion 12 and the outer peripheral surface of the housing 8 is the same as or thinner than the minimum wall thickness TK2 between the inner peripheral surface of the small-diameter accommodating portion 13 and the outer peripheral surface of the housing 8. Therefore, immediately after manufacturing, the outer diameter of the motor 6 assembled to the hole portion 11 is defined by the inner diameter of the small-diameter accommodating portion 13.

[0020] Here, FIG. 4 shows a cross-sectional view corresponding to FIG. 3 of the state where the inner peripheral wall of the small-diameter accommodating portion 13 is cut. When changing the motor 6 to another motor having a larger outer diameter, by cutting the inner peripheral wall of the small-diameter accommodating portion 13, as shown in FIG. 4, the inner diameter of the small-diameter accommodating portion 13 can be enlarged to the inner diameter of the large-diameter accommodating portion 12. Therefore, without newly installing the housing 8, another motor having a larger outer diameter than the existing motor 6 can be accommodated in the housing 8 and used.

[0021] According to the configuration of this embodiment, since the step portion 14 is provided between the inner peripheral surface of the large-diameter accommodating portion 12 and the inner peripheral surface of the small-diameter accommodating portion 13, as shown in FIG. 4, it is possible to cut the inner wall of the small-diameter accommodating portion 13 using the width of the step portion 14 as a guide. Therefore, the machining allowance of the small-diameter accommodating portion 13 can be easily ensured by the step portion 14. Further, since the surface of the step portion 14 has an R shape or a tapered shape, when assembling the motor 6 to the hole portion 11, the catching of the motor to the step portion 14 is reduced. Therefore, the assembling property of the motor 6 to the hole portion 11 can be improved by the surface shape of the step portion 14.

[0022] Note that the disclosed technology is not limited to the above-described embodiments, and a part of the configuration can be appropriately changed and implemented without departing from the spirit of the disclosed technology.

[0023] For example, in the above-described embodiment, the surface of the stepped portion 14 is formed into an R shape or a tapered shape, but it can also be formed into a flat shape.

Industrial Applicability

[0024] This disclosed technology can be applied to a throttle device provided in an intake passage of an engine.

Explanation of Reference Numerals

[0025] 1 Throttle device 4 Valve body 5 Valve shaft 6 Motor 8 Housing 11 Hole portion 12 Large-diameter housing portion 13 Small-diameter housing portion 14 Stepped portion

Claims

1. Valve body and, The valve body is fixed to the valve stem, An electric motor for rotating the valve shaft, A housing for the motor, The housing has a hole for assembling the motor and In a throttle device equipped with, The aforementioned hole includes a large-diameter housing portion and a small-diameter housing portion arranged coaxially. The minimum wall thickness between the inner surface of the large-diameter housing and the outer surface of the housing is the same as or thinner than the minimum wall thickness between the inner surface of the small-diameter housing and the outer surface of the housing. A throttle device characterized by the following features.

2. In the throttle device according to claim 1, A stepped portion is provided between the inner surface of the large-diameter housing portion and the inner surface of the small-diameter housing portion. The surface of the stepped portion has an R shape or a tapered shape. A throttle device characterized by the following features.

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