JP4512018B2 - Mounting structure of electric motor to throttle body - Google Patents

Description

In the present invention, a mounting hole in which an electric motor for driving the bypass valve is fitted is formed in a throttle body to which the bypass valve is attached, and the electric motor is provided in a holding plate that presses the outer end surface of the motor. A plurality of fixing portions are fixed to the throttle body by a plurality of fixing members, and foreign matter enters from the outside into the mounting hole between the electric motor and the throttle body. elastic seal member for preventing the Ru is configured to so that is interposed, to an improved mounting structure to the electric motor of the throttle body.

A body having a mounting hole, an elastic seal member interposed between the body and the parts fitted in the mounting hole, a holding plate for pressing the outer end surface to hold the parts, A component mounting structure composed of a plurality of fixing members that fix a plurality of fixing portions to the body is already known as disclosed in Patent Document 1.
JP 2001-342901 A

  In the conventional part mounting structure, the elastic seal member is arranged so that it is radially compressed between the body and the part. Therefore, the elastic seal member is to exert its sealing function properly. Therefore, it is necessary to give a predetermined compression allowance. Therefore, the dimension between the diameter of the inner peripheral surface of the mounting hole of the body pressed against the outer peripheral surface of the elastic seal member and the diameter of the outer peripheral surface of the component pressed against the inner peripheral surface of the elastic seal member The accuracy must be strictly controlled, which is one obstacle to the cost reduction of the component mounting structure.

The parts fitted in the mounting holes of the body are pressed and held by the entire inner peripheral edge of the annular or C-shaped holding plate in which a plurality of fixing portions are fixed to the body by fixing members. Therefore, the holding plate, and the pressing part close to the fixed part, at the far pressing portion from the fixing portion, the pressing force is significantly different for the components, much greater in the pressing force of the pressing portion adjacent to the fixed portion. Such a difference in pressing force with respect to the components at each portion of the pressing portion has a considerable influence on the sealing function of the elastic seal member interposed between the components and the body.

The present invention has been made in view of the above points, and it is possible to provide an elastic seal member without particularly strict dimensional accuracy of a body and parts , particularly a throttle body and an electric motor for driving a bypass valve attached to the throttle body. An appropriate compression allowance can be given, and the pressing force against the electric motor at each pressing portion of the holding plate can be equalized to ensure a normal sealing function of the elastic seal member. An object is to provide a structure for mounting an electric motor to a throttle body .

In order to achieve the above object, according to the present invention, a mounting hole in which an electric motor for driving the bypass valve is fitted is formed in a throttle body to which the bypass valve is attached. A plurality of fixing portions provided on the holding plate for holding the end surface are fixed to the throttle body by a plurality of fixing members, and are held by the throttle body, and are externally provided between the electric motor and the throttle body. the mounting elastic sealing member for preventing foreign material from entering the holes Ru is configured to so that is interposed, a mounting structure of the electric motor of the throttle body, the electric motor is fitted to the mounting hole And a large-diameter portion whose lower end surface can abut on the upper end surface of the throttle body. While arranged to be axially compressed between an upward stepped portion formed in an upper portion of the mounting hole of Ttorubodi said portion to be fitted in the mounting hole of the electric motor, the holding plate, said An elastic deformation portion is provided between the pressing portion of the holding plate with respect to the electric motor and the fixing portion, and the compression deformation amount of the elastic seal member is such that the lower end surface of the large diameter portion of the electric motor is the upper end surface of the throttle body. It is the first feature that it is regulated by abutting on the.

  In addition to the first feature, the second feature of the present invention is that the elastically deformable portion is formed by providing a notch on a side edge thereof.

Furthermore, in addition to the second feature, the present invention has a third feature in that a positioning projection that fits into the notch is provided on the outer end surface of the electric motor .

  Furthermore, in addition to any one of the first to third features, the present invention provides a pair of the fixing portions on one of two straight lines orthogonal to each other on the holding plate, and the other straight line. A fourth feature is that a pair of the pressing portions are respectively disposed in the first portion.

Furthermore, in addition to any one of the first to fourth characteristics, the present invention includes a pair of the fixing portions opposed to each other and a plurality of pressing portions arranged on one side and the other side of the fixing portions. The fifth feature is that when the distance between the two is different, the elastic deformation portion located on the short side is set smaller than the elastic modulus of the elastic deformation portion located on the long side. .

The “parts fitted in the mounting holes of the electric motor” correspond to the small diameter part and the medium diameter part of the electric motor in the embodiments of the present invention described later.

According to the first aspect of the present invention, the elastic seal member is compressed in the axial direction between the upward step formed in the upper portion of the mounting hole of the throttle body and the portion fitted in the mounting hole of the electric motor. To be arranged. When a plurality of fixing portions of the holding plate are fixed to the body, the fixing force is moderately moderated by the elastic deformation of the elastic deformation portion and dispersed to the plurality of pressing portions, and presses each portion of the electric motor substantially equally. will be, it can give a substantially equal axial compressive deformation to each portion of the elastic sealing member interposed between the throttle body and the electric motor, can keep its sealing function properly, mounted externally hole foreign matter Ru can be reliably prevented from entering the. In addition , since the compression allowance of the elastic seal member depends on the stress generated in the elastically deformed portion, the elastic accuracy is not limited to the radial accuracy of the mounting hole and the electric motor, and the axial accuracy is not particularly strict. A predetermined compression allowance can be given to the seal member, which can contribute to a reduction in manufacturing cost. On the other hand , the amount of compressive deformation of the elastic seal member is regulated by the lower end surface of the large-diameter portion of the electric motor coming into contact with the upper end surface of the throttle body, so that the elastic seal member is also prevented from being excessively compressed. .

  According to the second feature of the present invention, the elastically deformable portion can be easily formed on the holding plate.

According to the third feature of the present invention, the electric motor can be easily positioned using the notch.

  According to the fourth feature of the present invention, the pair of fixing portions and the pressing portion are arranged on one and the other of the two straight lines orthogonal to each other on the holding plate. The electric motor can be efficiently held by the pressing portion, and the structure can be simplified and the cost can be reduced.

  According to the fifth feature of the present invention, the fixing force of the plurality of fixing portions to the body can be distributed evenly and accurately to the plurality of pressing portions. , The sealing function can be further enhanced.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

1 is a plan view of a structure for mounting an electric motor to a throttle body according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is according to a second embodiment of the present invention. plan view of the mounting structure of the electric motor of the throttle body, FIG. 4 is sectional view taken along line 4-4 in FIG. 3, a plan view of the mounting structure of the electric motor of the throttle body according to the third embodiment of FIG. 5 is the invention 6 is a cross-sectional view taken along line 6-6 of FIG.

  First, the description of the first embodiment of the present invention shown in FIGS. 1 and 2 will be started.

A throttle body 1 attached to the engine has a guide hole 2 and a mounting hole 4 connected to the upper end of the guide hole 2 via a first upward stepped portion 3. 2 Has an upward step 5. That is, the mounting hole 4 includes a deep small diameter portion 4a and a shallow large diameter portion 4b connected to the small diameter portion 4a via the second upward stepped portion 5. Further, on the upper end surface 1a of the throttle body 1, mounting bosses 6 and 6 with screw holes are provided so as to be integrally protruded so as to sandwich the mounting hole 4 at a position offset from the center thereof.

  A piston-like bypass valve 10 is slidably fitted in the guide hole 2, and an electric motor 11 for driving the bypass valve 10 is fitted in the mounting hole 4. This electric motor 11 becomes a component attached by the present invention.

  The electric motor 11 can abut the lower end surface on the upper end surface 1a of the throttle body 1 in addition to the small diameter portion 11a and the medium diameter portion 11b fitted in the small diameter portion 4a and the large diameter portion 4b of the mounting hole 4, respectively. It has a large diameter part 11c. When the electric motor 11 is fitted into the mounting hole 4, an annular first elastic seal member 12 is interposed between the first upward step portion 3 of the mounting hole 4 and the lower end surface of the small diameter portion 11 a of the electric motor 11. The first elastic seal member 12 is provided with a seal lip in close contact with the outer peripheral surface of the output shaft 11 s of the electric motor 11 on the inner peripheral edge, and contributes to prevention of entry of foreign matter into the electric motor 11.

An annular second elastic seal member 14 (O-ring in the illustrated example) is interposed between the second upward stepped portion 5 and the lower end surface of the middle diameter portion 11b of the electric motor 11, and this second elastic seal member. No. 14 contributes to preventing foreign matter from entering the mounting hole 4 and the guide hole 2 from the outside. These elastic seal members 12 and 14 are compressed in the axial direction when the electric motor 11 is mounted in the mounting hole 4, and the amount of compression deformation is such that the lower end surface of the large-diameter portion 11 c of the electric motor 11 is the throttle body. 1 is restricted by contacting the upper end surface 1a.

  On the upper end surface of the large-diameter portion 11c of the electric motor 11, a rectangular positioning convex portion 15 is formed at the center thereof, and a pair of angle convex portions 16 and 16 are formed with a pair of long side portions of the positioning convex portion 15 interposed therebetween. The protrusions 15 and 16 project outward from the upper end surfaces of the mounting bosses 6 and 6 when the elastic seal members 12 and 14 are free.

  The electric motor 11 fitted in the mounting hole 4 is held by an annular holding plate 20 fixed to the mounting bosses 6 and 6 with bolts 19 and 19. The holding plate 20 is made of a metal plate or a synthetic resin, and its outer shape is a substantially right triangle with a rounded top, and a pair of tops located at both ends of the bottom are the mounting bosses 6, 6 are a pair of fixing portions 21 and 21 fixed by bolts 19 and 19. Accordingly, each fixing portion 21 has a bolt hole 22 through which the bolt 19 is inserted.

  In addition, the holding plate 20 is provided with a pair of first and second pressing portions 23 and 24 that press the pair of mountain-shaped convex portions 16 and 16 at the central portion of the bottom and the other top portion. Further, at the inner peripheral edge of the holding plate 20, a pair of side edges 25, 25 that engage with a pair of opposing short side surfaces of the positioning convex portion 15, and between the fixing portions 21 and the first pressing portion 23. A pair of first cutouts 26, 26 located in the portion and a pair of second cutouts 27, 27 located in the middle of each fixing portion 21 and the second pressing portion 24 are provided. Portions corresponding to the first and second notches 26 and 27 are first and second elastic deformation portions 28 and 29, respectively.

  In the case of this embodiment, the distance between the first pressing portion 23 and each fixing portion 21 is shorter than the distance between the second pressing portion 24 and each fixing portion 21. By forming the first cutouts 26, 26 on the short distance side larger than the second cutouts 27, 27 on the long distance side, the elastic modulus of the first elastic deformation portion 28 becomes the second elastic deformation portion. The elastic modulus is set to be smaller than 29.

  Thus, the pair of fixing portions 21, 21 are arranged on one straight line A drawn on the holding plate 20, and a pair of pressing portions 23 on another straight line B orthogonal to the straight line A. , 24 are arranged.

The electric motor 11 includes a coupler 30 that protrudes laterally from between the pair of mounting bosses 6 and 6. On the other hand, one of the pair of side edges 25, 25 of the holding plate 20 is provided with a small notch 32 to which a small protrusion 31 from one side surface of the positioning convex portion 15 of the electric motor 11 is engaged. By engaging, the protruding direction of the coupler 30 is regulated to be constant.

  Next, the operation of the first embodiment will be described.

When the electric motor 11 is fitted into the mounting hole 4 of the throttle body 1, the first and second elastic seal members 12 and 14 are compressed between the throttle body 1 and the electric motor 11 in the axial direction. Interpose. After the electric motor 11 is fitted into the mounting hole 4, the first and second pressing portions 23 and 24 of the holding plate 20 are overlapped with the pair of convex portions 16 and 16 of the electric motor 11, respectively. Are fixed to a pair of mounting bosses 6 and 6 with bolts 19 and 19. In this way, the fixing force is transmitted to the first and second pressing portions 23 and 24 through the first and second elastically deformable portions 28 and 29, to press the pair of chevron convex portions 16, 16 of the electric motor 11 It will be. Thus, this time, by the elastic deformation is generated in the first and second elastically deformable portions 28 and 29, the fixing force by the bolts 19 and 19, Ru is transmitted directly to the first and second pressing portions 23 and 24 Instead, it is dispersed to the first and second pressing portions 23 and 24 while being moderately relaxed, and presses the chevron convex portions 16 and 16 substantially equally. As a result, the portions of the first and second elastic seal members 12 and 14 can be substantially equally compressed in the axial direction, and their sealing functions can be maintained normally.

  Accordingly, since the compression allowance of the first and second elastic seal members 12 and 14 depends on the stress generated in the first and second elastic deformation portions 28 and 29 of the holding plate 20, the mounting hole 4 and the electric motor 11 can provide a predetermined compression allowance to the first and second elastic seal members 12 and 14 without particularly stricting the dimensional accuracy in the axial direction as well as the dimensional accuracy in the axial direction, thereby reducing the manufacturing cost. Can contribute.

  In particular, the elastic modulus of the first elastic deformation portion 28 located on the side where the distance between the first pressing portion 23 and each fixing portion 21 is short is the distance between the second pressing portion 24 and each fixing portion 21. Since it is set smaller than the elastic modulus of the second elastic deformation portion 29 located on the long side, it is possible to equalize the dispersion of the fixing force by the bolts 19 and 19 to the first and second pressing portions 23 and 24. Therefore, it is possible to equalize the compressive deformation of each part of the first and second elastic seal members 12 and 14, and to further enhance their sealing function.

  The pair of fixing portions 21 and 21 and the pressing portions 23 and 24 are arranged on one and the other on the two straight lines A and B orthogonal to each other on the holding plate 20, thereby minimizing the fixing portion. The electric motor 11 can be efficiently held by the 21, 21 and the pressing portions 23 and 24, and the structure can be simplified and the cost can be reduced.

  Next, a second embodiment of the present invention shown in FIGS. 3 and 4 will be described.

On the upper end surface 1a of the throttle body 1, three mounting bosses 6 are provided so as to surround the mounting hole 4 at equal intervals. The outer shape of the annular holding plate 20 is an equilateral triangle, and three apexes thereof are fixed portions 21 having bolt holes 22 (see FIG. 2) . On the inner peripheral edge of the holding plate 20, there are three tongue-shaped pressing portions 23 which are located at the center between the three fixing portions 21 and can press the upper end surface of the electric motor 11, and these pressing portions 23. ... and notches 26 located between each of the fixing portions 21 ... are provided, and portions of the holding plate 20 corresponding to these notches 26, that is, portions sandwiched between the fixing portions 21 and the pressing portions 21 are provided. Is the elastic deformation portion 28.

  On the other hand, on the upper end surface of the electric motor 11, a substantially triangular positioning convex portion 15 'that engages the leading edges of the three pressing portions 23 is formed. Further, the upper end surface of the electric motor 11 protrudes outward from the upper end surface of the mounting boss 6 in a free state of the elastic seal members 12 and 14.

  Since the other configuration is substantially the same as that of the previous embodiment, in FIG. 3 and FIG. 4, portions corresponding to those of the previous embodiment are denoted by the same reference numerals, and redundant description is omitted.

In this second embodiment, when the three fixing portions 21 are fixed to the mounting bosses 6 by the bolts 19, their fixing forces are three that are arranged at equal intervals in the circumferential direction via the elastic deformation portions 28. are evenly transmitted to the pressing portion 23 ..., since thereby to press the upper end surface of the electric motor 11, it is possible to equalize the compressive deformation of the respective portions of the first and second elastic sealing members 12, they The sealing function is normally exhibited.

  Finally, a third embodiment of the present invention shown in FIGS. 5 and 6 will be described.

A pair of mounting bosses 6 and 6 are provided on the upper end surface 1a of the throttle body 1 so as to project the mounting hole 4 on its diameter line. The electric motor 11 includes a coupler 30 protruding from the upper end surface. The holding plate 20 has a substantially C shape so that the electric motor 11 can be held without being obstructed by the coupler 30. A pair of fixing portions 21 and 21 corresponding to the mounting bosses 6 and 6 are formed on the holding plate 20. Further, a pair of first pressing portions 23 and 23 that are close to each other and can press the upper end surface of the electric motor 11 on the inner peripheral edge of the holding plate 20, and the first pressing portions 23 and 23 on the diameter line of the electric motor 11. And a plurality of notches 26, 27 intervening between the pressing portions 23, 23, 24, and corresponding to these notches 26, 27 of the holding plate 20. The portions to be made are the elastic deformation portions 28 and 29.

  Further, a positioning projection 35 that engages with a specific notch 26 is formed on the upper end surface of the electric motor 11, and the electric motor 11 is positioned by their engagement.

  Since the other configuration is substantially the same as that of the first embodiment, in FIG. 5 and FIG. 6, the same reference numerals are assigned to the portions corresponding to those of the first embodiment, and the duplicate description is omitted. .

Also in the third embodiment, when the pair of fixing portions 21 and 21 are fixed to the mounting bosses 6 and 6 by the bolts 19 and 19, their fixing force is transmitted through the plurality of elastically deforming portions 28 and 29. first and second pressing portions 23 and 23 aligned in a direction; dispersed to transmit the 24, because thereby to press the upper end surface of the electric motor 11, the respective portions of the first and second elastic sealing members 12, 14 The compressive deformation can be equalized, and their sealing function is exhibited normally.

As mentioned above, although the Example of this invention was described, this invention is not limited to it, A various design change is possible in the range which does not deviate from the summary .

It is a top view of the attachment structure to the throttle body of the electric motor which concerns on 1st Example of this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a top view of the attachment structure to the throttle body of the electric motor which concerns on 2nd Example of this invention. FIG. 4 is a sectional view taken along line 4-4 of FIG. It is a top view of the attachment structure to the throttle body of the electric motor which concerns on 3rd Example of this invention. FIG. 6 is a sectional view taken along line 6-6 of FIG.

A, B ... straight line 1 ... throttle body
1a ... upper end surface
3 ... Upward step (first upward step)
4 ... Mounting hole
5 ... Upward step (second upward step)
10 .... Bypass valve 11 .... Electric motor
11a: part to be fitted into the mounting hole (small diameter part)
11b: part to be fitted in the mounting hole (medium diameter part)
11c: Large diameter portion 12, 14 ... Elastic seal member 19 ... Fixing member (bolt)
20... Holding plate 21... Adhering portions 23 and 24... Pressing portions 26 and 27 ... Notches 28 and 29.

Claims (5)

A mounting hole (4) into which an electric motor (11) for driving the bypass valve (10) is fitted is formed in the throttle body (1) to which the bypass valve (10) is attached. The electric motor (11) However, a plurality of fixing portions (21, 21) provided on the holding plate (20) for pressing the outer end surface of the motor (11) are fixed to the throttle body (1) by a plurality of fixing members (19, 19). This is an elastic seal that is held by the throttle body (1) and prevents foreign matter from entering the mounting hole (4) from the outside between the electric motor (11) and the throttle body (1). member (14) is Ru is configured to so that is interposed, a mounting structure of the electric motor of the throttle body,
The electric motor (11) includes a portion (11a, 11b) to be fitted in the mounting hole (4) and a large diameter portion (a lower end surface that can abut on the upper end surface (1a) of the throttle body (1)). 11c)
The elastic seal member ( 14 ) is fitted into an upward step ( 5 ) formed in the upper part of the mounting hole (4) of the throttle body (1) and the mounting hole (4) of the electric motor (11). While arranged so as to be compressed in the axial direction between the parts to be mounted ( 11b ),
The holding plate (20) includes an elastic deformation portion (28, 29) between the pressing portion (23, 24) of the holding plate (20) against the electric motor (11) and the fixing portion (21, 21). )
The amount of compressive deformation of the elastic seal member ( 14 ) is regulated by the lower end surface of the large diameter portion (11 c) of the electric motor (11) coming into contact with the upper end surface (1 a) of the throttle body (1). A structure for mounting the electric motor to the throttle body.
The mounting structure of the electric motor according to claim 1 to the throttle body ,
The elastic deformation part (28, 29) is formed by providing a notch (26, 27) on a side edge thereof, and the structure for mounting the electric motor to the throttle body . In the structure for attaching the electric motor to the throttle body according to claim 2,
A structure for mounting an electric motor to a throttle body , characterized in that a positioning projection (35) that fits into the notches (26, 27) is provided on an outer end surface of the electric motor (11). In the attachment structure to the throttle body of the electric motor in any one of Claims 1-3,
On the holding plate (20), a pair of the fixing portions (21, 21) is placed on one of two straight lines (A, B) orthogonal to each other, and a pair of the pressing portions ( 23, 24), respectively, and an electric motor mounting structure on the throttle body . In the attachment structure to the throttle body of the electric motor in any one of Claims 1-4,
Respective distances between the pair of fixing portions (21, 21) facing each other and the plurality of pressing portions (23, 24) arranged on one side and the other side of these fixing portions (21, 21) There when difference is elastically deformable portion positioned on the short side of the distance (28), characterized by being smaller than the elastic modulus of the elastic deformation portion (29) located in the long side of the distance, the electric Mounting structure of the motor to the throttle body .

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