WO2016181614A1

WO2016181614A1 - Fastening structure and accelerator pedal device using same

Info

Publication number: WO2016181614A1
Application number: PCT/JP2016/002090
Authority: WO
Inventors: 針生　鉄男; 鈴木　治彦; 齊藤　豪宏; 博史佐治
Original assignee: 株式会社デンソー
Priority date: 2015-05-12
Filing date: 2016-04-19
Publication date: 2016-11-17
Also published as: CN116080394A

Abstract

A fastening structure and an accelerator pedal device using said fastening structure, wherein a screw (13) is inserted into a threaded insertion hole (41) of a cover (12) from the side of the cover (12) opposite a housing (11), and is threaded into a threading hole (43) of a fastening part (42) of the housing. An annular space (45) is formed between the fastening part and an edge part (44) of the threaded insertion hole. Even if an edge part (47) of the threading hole of the fastening part is pushed up against the cover by a screw thread (23) of the screw when the screw is threaded in, the edge part (47) can bend so as to slip into the annular space. Therefore, great tensile stress in the roots (49) of the thread grooves (48) in proximity to the edge part of the threading hole can be avoided. Consequently, damage such as declining of the edge part of the threading hole can be suppressed in a fastening structure comprising a cover, a housing, and a screw.

Description

Fastening structure and accelerator device using the same

Cross-reference of related applications

This application includes Japanese Patent Application No. 2015-097156 filed on May 12, 2015 and Japanese Patent Application No. 2016- filed on March 31, 2016, the disclosures of which are incorporated herein by reference. Based on 070395.

The present disclosure relates to a fastening structure and an accelerator device using the same.

Screws are widely used as fastening members for fastening two members to be fastened. For example, when fastening the first fastened member and the second fastened member, the screw is inserted into the screw insertion hole of the second fastened member from the side opposite to the first fastened member with respect to the second fastened member. And screwed into the first member to be fastened. In the accelerator device disclosed in Patent Document 1, a “tamper-proof screw” which is a kind of screw is used to fasten the housing and the cover.

Incidentally, in Patent Document 1, the screw is screwed in a state where the housing and the cover are combined so that the edge of the screw insertion hole of the cover comes into contact with the edge of the screw hole of the housing. Therefore, the edge of the screw hole in the housing is compressed between the cover and the screw thread. As a result, a large tensile stress is generated at the bottom of the thread groove near the edge of the screw hole, and there is a risk of damage such as chipping of the edge of the screw hole.

JP 2014-47882 A

The present disclosure has been made in view of the above points, and an object of the present disclosure is to provide a fastening structure in which breakage of a fastened member is suppressed, and an accelerator device using the fastening structure.

According to an aspect of the present disclosure, the fastening structure includes a first fastened member, a second fastened member combined with the first fastened member, a first fastened member, and a second fastened member. A screw that is fastened. The screw is inserted into the screw insertion hole of the second fastened member from the side opposite to the first fastened member with respect to the second fastened member and screwed into the first fastened member. An annular space is provided between the edge of the screw insertion hole of the second fastened member and the first fastened member.

By forming the annular space in this manner, the edge of the screwed hole of the first fastened member is not moved into the annular space even when the screw is pushed up to the second fastened member side by the screw thread. Can be bent to escape. Therefore, it can be avoided that a large tensile stress is generated at the bottom of the thread groove near the edge of the screw hole. Therefore, it is possible to obtain a fastening structure in which breakage such as chipping of the edge of the screw hole is suppressed.

According to another aspect of the present disclosure, an accelerator device includes a first fastened member, a second fastened member combined with the first fastened member, a first fastened member, and a second fastened member. A screw that is fastened, a shaft having one end rotatably supported by the first fastened member, and a shaft that is rotatably supported by the second fastened member, and a pedal boss connected to the shaft An accelerator pedal, a link having a link boss portion provided to face the pedal boss portion in the axial direction, and a pressing device. The screw is inserted into the screw insertion hole of the second fastened member from the side opposite to the first fastened member with respect to the second fastened member and screwed into the first fastened member. The pressing device presses the pedal boss part on the opposite side of the link boss part to the one side of the first and second fastened members with increasing force as the rotation angle from the fully closed position of the accelerator pedal increases. However, the link boss part is pressed to the other side of the first fastened member and the second fastened member on the side opposite to the pedal boss part. An annular space is provided between the edge of the screw insertion hole of the second fastened member and the first fastened member.

In such an accelerator device, when the accelerator pedal is depressed, the first fastening member and the second fastening member are pressed away from each other by the pressing device, and stress ( Hereinafter, the stress during depression will act. On the other hand, in the present disclosure, by providing the annular space as described above, it is possible to avoid occurrence of a large tensile stress at the bottom of the thread groove near the edge of the screw hole due to screw screwing. ing. For this reason, even when a stepping stress is applied, damage such as chipping of the edge of the screw hole can be suppressed.

It is a figure showing an accelerator device by a 1st embodiment of this indication. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a characteristic view which shows the relationship between the pedal effort of an accelerator pedal of the accelerator apparatus of FIG. 1, and a pedal rotation angle. FIG. 5 is a sectional view taken along line VV in FIG. 1. It is sectional drawing which shows a mode that the head receiving part of the cover of FIG. 5 bends. It is sectional drawing which shows the fastening part of a cover and a housing among the accelerator apparatuses by 2nd Embodiment of this indication. It is a figure which shows the fastening part of a cover and a housing among the accelerator apparatuses by 3rd Embodiment of this indication. It is a figure which shows the fastening part of a cover and a housing among the accelerator apparatuses by 4th Embodiment of this indication. It is a figure which shows the fastening part of a cover and a housing among the accelerator apparatuses by 5th Embodiment of this indication.

Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly show that combinations are possible in each embodiment, but also combinations of the embodiments even if they are not explicitly stated unless there is a problem with the combination. Is also possible.

[First Embodiment]
An accelerator device according to a first embodiment of the present disclosure is shown in FIGS. The accelerator device 10 is an input device operated by a driver in order to adjust the driving state of a vehicle engine (not shown). The accelerator device 10 is electronic, and transmits an electric signal indicating the amount of depression of the accelerator pedal 15 to an electronic control device (not shown). The electronic control device drives the throttle valve based on the electric signal transmitted from the accelerator device 10.

First, the overall configuration of the accelerator apparatus 10 will be described with reference to FIGS. The accelerator device 10 shown in FIGS. 1 to 3 is shown in a positional relationship where it is attached to the vehicle body 90. As shown in FIGS. 1 to 3, the accelerator device 10 includes a housing 11, a cover 12, a screw 13, a shaft 14, an accelerator pedal 15, a link 16, a spring 17, a rotation angle sensor 18, a first friction plate 19, and a second friction plate 19. A friction plate 20 is provided.

The housing 11 has a housing portion 21 and an attachment portion 22 attached to the vehicle body 90 by, for example, bolts 91. In the present embodiment, the housing 11 is made of resin. The housing 11 may be used as an example of a first fastened member.

The cover 12 is combined with the housing 11 so as to close a part of the opening of the accommodating portion 21. In the present embodiment, the cover 12 is made of resin. The cover 12 may be used as an example of a second fastened member combined with the first fastened member.

The screw 13 fastens the housing 11 and the cover 12. In this embodiment, the screw 13 is a metal tapping screw, and three screws 13 are provided.

The housing 11, the cover 12, and the screw 13 constitute a fastening structure.

The shaft 14 has one end portion rotatably supported by the housing 11 and the other end portion rotatably supported by the cover 12. A sensor installation hole 26 is formed at one end of the shaft 14.

The accelerator pedal 15 has a pedal boss portion 27 connected to the shaft 14, a rod 28 connected to the pedal boss portion 27, and a pad 29 fixed to the tip portion of the rod 28. The accelerator pedal 15 can rotate together with the shaft 14 from a fully closed position where the pedal boss 27 abuts against the fully closed stopper 30 of the housing 11 to a fully opened position where the pedal boss 27 abuts against the fully open stopper 31 of the housing 11.

The link 16 has an annular link boss portion 32 provided so as to face the pedal boss portion 27 in the axial direction, and a spring locking portion 33 protruding from the link boss portion 32. The link boss part 32 is provided coaxially with the shaft 14. Hereinafter, the direction in which the accelerator pedal 15 rotates from the fully closed position toward the fully open position is referred to as “accelerator opening direction”. The direction in which the accelerator pedal 15 rotates from the fully open position toward the fully closed position is referred to as “accelerator closing direction”.

The pedal boss portion 27 forms a plurality of first inclined teeth 34 protruding toward the link boss portion 32 side. The first inclined teeth 34 are arranged at intervals in the circumferential direction. The first inclined tooth 34 has a first inclined surface 35 that is inclined so as to be positioned in the accelerator closing direction toward the tip.

The link boss part 32 forms a plurality of second oblique teeth 36 protruding toward the pedal boss part 27 side. One second inclined tooth 36 is arranged between each first inclined tooth 34. Further, the second inclined tooth 36 has a second inclined surface 37 that is inclined so as to be positioned in the accelerator opening direction toward the tip.

The first inclined teeth 34 and the second inclined teeth 36 transmit rotation between the accelerator pedal 15 and the link 16 when the inclined surfaces come into contact with each other. Specifically, the first inclined teeth 34 and the second inclined teeth 36 transmit the rotation of the accelerator pedal 15 in the accelerator opening direction to the link 16. The first inclined teeth 34 and the second inclined teeth 36 transmit the rotation of the link 16 in the accelerator closing direction to the accelerator pedal 15.

Further, the first inclined teeth 34 and the second inclined teeth 36 are pressing the pedal boss portion 27 to the side opposite to the link boss portion 32 by contacting the inclined surfaces when the accelerator pedal 15 rotates in the accelerator opening direction. The link boss part 32 is pressed to the side opposite to the pedal boss part 27. The pressing force at this time increases as the rotation angle (pedal rotation angle) of the accelerator pedal 15 from the fully closed position increases. The first inclined teeth 34 and the second inclined teeth 36 are configured to press the link boss portion 32 and the pedal boss portion 27 while pressing the pedal boss portion 27 on the opposite side of the link boss portion 32 to one side of the housing 11 and the cover 12. May be used as an example of a pressing device that presses the other side of the housing 11 and the cover 12 on the opposite side.

The spring 17 is provided between the spring locking portion 33 and the housing 11 and urges the link 16 in the accelerator closing direction.

The rotation angle sensor 18 includes a magnetic detection element 38 provided in the sensor installation hole 26 and a pair of

magnets

39 and 40 fixed to the inner wall of the sensor installation hole 26. The magnetic detection element 38 outputs an electrical signal corresponding to the density of the magnetic flux that changes as the shaft 14 rotates. The rotation angle sensor 18 detects the pedal rotation angle.

The first friction plate 19 is provided between the pedal boss portion 27 and the housing 11 and is fixed to the pedal boss portion 27. The first friction plate 19 is pressed against the housing 11 when the pedal boss portion 27 is pressed away from the link boss portion 32. The frictional force between the first friction plate 19 and the housing 11 at this time becomes the rotational resistance of the accelerator pedal 15 and the link 16.

The second friction plate 20 is provided between the link boss portion 32 and the housing 11, and is fixed to the link boss portion 32. The second friction plate 20 is pressed against the housing 11 when the link boss portion 32 is pressed away from the pedal boss portion 27. The frictional force between the second friction plate 20 and the housing 11 at this time becomes the rotational resistance of the accelerator pedal 15 and the link 16.

In the accelerator device 10 configured as described above, the rotation of the accelerator pedal 15 in the accelerator opening direction is transmitted to the link 16 when the first slope 35 and the second slope 37 are engaged. At this time, the first inclined teeth 34 and the second inclined teeth 36 have the

friction plates

19, 20 so that the frictional force increases as the pedal rotation angle increases and rotational resistance is applied to the accelerator pedal 15 and the link 16. Press against the housing 11 and the cover 12.

When the accelerator pedal 15 is depressed, the rotational resistance acts so that the pedaling force increases as shown by a solid line in FIG. 4, and when the accelerator pedal 15 is returned, the pedaling force decreases as shown by a one-dot chain line in FIG. Act on. That is, the relationship between the pedaling force and the pedal rotation angle is a relationship in which a hysteresis loop is drawn so that the pedaling force is different between when the pedal rotation angle is increased and when the pedal rotation angle is decreased.

Next, the characteristic configuration of the accelerator apparatus 10 will be described with reference to FIG. The screw 13 has a shaft portion 24 that forms a helical thread 23 and a head portion 25 provided at one end of the shaft portion 24. The screw 13 is inserted into the screw insertion hole 41 of the cover 12 from the side opposite to the housing 11 with respect to the cover 12 and screwed into the screw hole 43 of the fastening portion 42 of the housing 11. An annular space 45 is formed between the edge 44 on the fastening portion 42 side of the screw insertion hole 41 and the fastening portion 42. The inner diameter D1 of the annular space 45 is larger than the outer diameter D2 of the screw thread 23, and further larger than the outer diameter D3 of the head 25. In the present embodiment, the annular space 45 is an internal space of the recess 46 formed in the cover 12. The recess 46 may be a portion that is recessed radially outward from the inner peripheral wall of the screw insertion hole 41 of the cover 12. By forming the annular space 45 in this way, the edge 47 of the screw hole 43 can be bent toward the edge 44 without contacting the edge 44 of the screw insertion hole 41.

As described above, in the first embodiment, the annular space 45 is formed between the edge portion 44 on the fastening portion 42 side of the screw insertion hole 41 of the cover 12 and the fastening portion 42 of the housing 11. By forming the annular space 45 in this way, the edge portion 47 of the screw-in hole 43 of the fastening portion 42 can be moved even if the screw 13 is pushed up to the cover 12 side by the screw thread 23 of the screw 13. It can bend to escape to 45. Therefore, it can be avoided that a large tensile stress is generated at the valley bottom 49 of the thread groove 48 near the edge 47 of the screw hole 43. Therefore, in the fastening structure including the cover 12, the housing 11, and the screw 13, it is possible to suppress damage such as a lack of the edge 47 of the screw hole 43.

Further, an annular space 45 is provided on the side opposite to the head 25 with respect to the head receiving part 50 of the cover 12. Therefore, the head receiving part 50 can relieve the tensile stress acting on the valley bottom 49 of the thread groove 48 by being bent toward the annular space 45 over time as shown by a two-dot chain line in FIG.

Further, the inner diameter D1 of the annular space 45 is larger than the outer diameter D2 of the screw thread 23. Therefore, the edge 47 of the screw hole 43 of the fastening portion 42 can be sufficiently bent toward the annular space 45 when the screw 13 is screwed.

Further, the inner diameter D1 of the annular space 45 is larger than the outer diameter D3 of the head 25. Therefore, the head receiving portion 50 of the cover 12 can sufficiently bend toward the annular space 45 over time as shown by a two-dot chain line in FIG.

The annular space 45 is an internal space of the recess 46 formed in the cover 12. Therefore, the annular space 45 can be provided without shortening the screw hole 43 of the fastening portion 42 of the housing 11.

Further, a fastening structure composed of the cover 12, the housing 11 and the screw 13 is used in the accelerator device 10. The housing 11 rotatably supports one end portion of the shaft 14. The cover 12 supports the other end of the shaft 14 in a rotatable manner. The accelerator pedal 15 has a pedal boss portion 27 connected to the shaft 14. The link 16 has a link boss part 32 provided to face the pedal boss part 27 in the axial direction. The pressing device composed of the first inclined teeth 34 and the second inclined teeth 36 is such that the pedal boss portion 27 is on the opposite side of the link boss portion 32 with a greater force as the rotation angle of the accelerator pedal 15 from the fully closed position increases. While pressing the housing 11 side, the link boss portion 32 is pressed to the cover 12 side on the side opposite to the pedal boss portion 27.

In such an accelerator device 10, when the accelerator pedal 15 is depressed, the pressing device presses the housing 11 and the cover 12 away from each other (the direction in which the housing 11 opens), and stress is applied around the screw hole 43 of the housing 11. Works. On the other hand, in this embodiment, the annular space 45 is provided as described above, so that a large tensile stress is applied to the valley bottom 49 of the thread groove 48 near the edge 47 of the screw hole 43 due to the screw 13 being screwed. Has been avoided. For this reason, even when the stepping-in stress acts, it is possible to suppress damage such as chipping of the edge 47 of the screw hole 43.

[Second Embodiment]
In the second embodiment of the present disclosure, as shown in FIG. 7, the annular space 60 is an internal space of a recess 62 formed in the housing 61. The recessed portion 62 may be a portion recessed radially outward from the inner peripheral wall of the screw hole 43 of the housing 61, and may be defined by the head receiving portion 67 of the cover 63 and the housing 61. As described above, even if the annular space 60 is provided in the housing 61, if the annular space 60 is formed between the edge portion 65 of the screw insertion hole 64 of the cover 63 and the fastening portion 66 of the housing 61, The same effect as the first embodiment can be obtained. In the second embodiment, the annular space 60 can be provided without reducing the strength of the head receiving portion 67 of the cover 63.

[Third Embodiment]
In the third embodiment of the present disclosure, as illustrated in FIG. 8, the edge portion 71 of the screw insertion hole 70 forms an annular protrusion that protrudes into the annular space 45. Therefore, the strength of the head receiving portion 50 of the cover 12 can be improved by the edge portion 71.

[Fourth Embodiment]
In the fourth embodiment of the present disclosure, as illustrated in FIG. 9, the annular space 45 is an internal space of the recess 46 formed in the cover 12. The housing 11 has a positioning protrusion 81 fitted in the recess 46. By providing the positioning protrusion 81 in this manner, the positioning accuracy between the housing 11 and the cover 12 is improved.

[Fifth Embodiment]
In the fifth embodiment of the present disclosure, as shown in FIG. 10, the annular space 60 is an internal space of a recess 62 formed in the housing 61. The cover 63 has a positioning projection 85 fitted in the recess 62. By providing the positioning projection 85 in this manner, the positioning accuracy between the housing 61 and the cover 63 is improved.

In the modification of the embodiment of the present disclosure, the annular space may be smaller than the outer diameter of the screw head. Furthermore, the annular space may be smaller than the outer diameter of the screw thread. In short, an annular space may be formed between the edge of the screw insertion hole of the cover and the housing. In the modification of the above-described embodiment of the present disclosure, the annular space may be a space in which the internal space of the recess formed in the cover and the internal space of the recess formed in the housing are combined. In the modification of the above embodiment of the present disclosure, the screw is not limited to a tapping screw, and may be another type of screw having no tapping function. Further, the screw is not limited to metal but may be made of resin, for example.

In the modification of the above-described embodiment of the present disclosure, the first fastened member and the second fastened member are not limited to resin, and may be made of metal, for example. In a modification of the above-described embodiment of the present disclosure, the accelerator device may be of another known type. In short, the accelerator device may be of a type including a fastening structure including a housing, a cover, and a screw. In the modification of the above embodiment of the present disclosure, the fastening structure may be applied not only to the accelerator device but also to other devices. As described above, the present disclosure is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist thereof.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A first fastened member (11, 61);
A second fastened member (12, 63) combined with the first fastened member;
The second member to be fastened is inserted into the screw insertion hole (41, 64, 70) of the second member to be fastened from the side opposite to the first member to be fastened and screwed into the first member to be fastened. A screw (13) for fastening the first fastened member and the second fastened member;
With
A fastening structure in which an annular space (45, 60) is provided between an edge (44, 65, 71) of the screw insertion hole of the second fastened member and the first fastened member.
The fastening structure according to claim 1, wherein an inner diameter (D1) of the annular space is larger than an outer diameter (D2) of a screw thread (23) of the screw.
The fastening structure according to claim 1 or 2, wherein an inner diameter of the annular space is larger than an outer diameter (D3) of the head (25) of the screw.
The fastening structure according to any one of claims 1 to 3, wherein the annular space (45) is an internal space of a recess (46) formed in the second fastening member.
The fastening structure according to any one of claims 1 to 3, wherein the annular space (60) is an internal space of a recess (62) formed in the first fastening member.
The fastening structure according to any one of claims 1 to 5, wherein the edge portion (71) of the screw insertion hole (70) forms an annular protrusion protruding into the annular space.
The annular space is an internal space of a recess (46, 62) formed in one of the first fastened member and the second fastened member;
The fastening according to any one of claims 1 to 6, wherein the other of the first fastened member and the second fastened member has a positioning protrusion (81, 85) fitted in the recess. Structure.
A first fastened member (11, 61);
A second fastened member (12, 63) combined with the first fastened member;
The second member to be fastened is inserted into the screw insertion hole (41, 64, 70) of the second member to be fastened from the side opposite to the first member to be fastened and screwed into the first member to be fastened. A screw (13) for fastening the first fastened member and the second fastened member;
A shaft (14) having one end rotatably supported by the first fastened member and the other end rotatably supported by the second fastened member;
An accelerator pedal (15) having a pedal boss (27) connected to the shaft;
A link (16) having a link boss portion (32) provided to face the pedal boss portion in the axial direction;
With a greater force as the rotation angle from the fully closed position of the accelerator pedal increases, the pedal boss portion is on the side opposite to the link boss portion and to one side of the first fastened member and the second fastened member. A pressing device (34, 36) that presses the link boss part on the opposite side of the pedal boss part to the other side of the first fastened member and the second fastened member while pressing,
With
An accelerator device in which an annular space (45, 60) is provided between an edge (44, 65, 71) of the screw insertion hole of the second fastened member and the first fastened member.
The accelerator device according to claim 8, wherein an inner diameter (D1) of the annular space is larger than an outer diameter (D2) of a screw thread (23) of the screw.
The accelerator device according to claim 8 or 9, wherein an inner diameter of the annular space is larger than an outer diameter (D3) of the head (25) of the screw.
The accelerator apparatus according to any one of claims 8 to 10, wherein the annular space (45) is an internal space of a recess (46) formed in the second fastened member.
The accelerator device according to any one of claims 8 to 10, wherein the annular space (60) is an internal space of a recess (62) formed in the first fastened member.
The accelerator device according to any one of claims 8 to 12, wherein the edge portion (71) of the screw insertion hole (70) forms an annular protrusion protruding into the annular space.
The annular space is an internal space of a recess (46, 62) formed in one of the first fastened member and the second fastened member;
The accelerator according to any one of claims 8 to 13, wherein the other of the first fastened member and the second fastened member has a positioning protrusion (81, 85) fitted in the recess. apparatus.