JP2014093273A - Mounting method and structure of key switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting method and structure of a key switch in which, when inserting and mounting a tubular key switch through a mounting hole which is opened on a dash board, versatility of the dash board is improved and cost can also be reduced.SOLUTION: According to a mounting method of a key switch, a mounting hole 19 is opened on a dash board 12, and a tubular key switch 18 which is rotationally operated, is inserted through the mounting hole 19, such that the key switch 18 is mounted to the dash board 12. By changing over whether a ring-shaped spacer 21 which is interposed between an edge of the mounting hole 19 and an outer periphery of the key switch 18 is to be fitted into the mounting hole 19 and mounted, a plurality of kinds of key switches 18 having different diameters can be mounted to the dash board 12.

Description

  The present invention relates to a key switch mounting method and structure.

  A mounting method and structure of a key switch in which the key switch is mounted on the dashboard by drilling a mounting hole in the dashboard and inserting a cylindrical key switch to be rotated into the mounting hole. (For example, refer to Patent Document 1).

Japanese Utility Model Publication No. 1-99751

  In the above document, a dedicated mounting hole corresponding to a cylindrical key switch is drilled in the dashboard, and the key switch is inserted through the mounting hole so that a plurality of types of key switches having different diameters are mounted on the dashboard. It cannot be installed, and the general versatility of the dashboard is low, and it may be difficult to keep the manufacturing cost low.

  The present invention provides a key switch mounting method and structure capable of keeping the dashboard versatile and reducing the cost when the cylindrical key switch is inserted into the mounting hole drilled in the dashboard. The issue is to provide.

  In order to solve the above-mentioned problem, first, a mounting hole 19 is formed in the dashboard 12, and a cylindrical key switch 18 to be rotated is inserted into the mounting hole 19, whereby the key switch 18 Is attached to the dashboard 12, and a ring-shaped spacer 21 interposed between the periphery of the mounting hole 19 and the outer periphery of the key switch 18 is fitted into the mounting hole 19 and mounted. By switching whether or not to perform, a plurality of types of key switches 18 having different diameters can be attached to the dashboard 12.

  Second, there is a key switch mounting structure in which a cylindrical key switch 18 to be rotated is inserted into a mounting hole 19 formed in the dashboard 12, and the peripheral edge of the mounting hole 19, the key A ring-shaped spacer 21 interposed between the outer periphery of the switch 18 can be detachably mounted in the mounting hole 19 in a fitted state.

  Third, the spacer 21 mounted on the outer periphery of the key switch 18 is formed in a C-ring shape.

  Fourthly, a plurality of engaging portions 40 and 42 that engage with the key switch 18 are provided on the inner peripheral side of the spacer 21 mounted on the outer periphery of the key switch 18.

  Since a ring-shaped spacer interposed between the periphery of the mounting hole and the outer periphery of the key switch can be detachably mounted in the mounting hole, the diameter of the key switch that is inserted without mounting the spacer The diameter of the key switch that is inserted with the spacer attached can be different, and multiple types of key switches can be attached to one dashboard, improving the versatility of the dashboard. In addition, this versatility can be applied to various vehicles, so that the manufacturing cost can be kept low.

  Further, according to the spacer formed on the outer periphery of the key switch in a C-ring shape, the diameter of the spacer can be enlarged / reduced, so that the spacer can be easily mounted in the mounting hole.

  Furthermore, according to the structure in which a plurality of engaging portions that engage with the key switch are provided on the inner peripheral side of the spacer that is mounted on the outer periphery of the key switch, the key switch is replaced with one of the plurality of engaging portions of the spacer. Since it only has to be engaged, a plurality of types of key switches having different engagement positions can be handled with one spacer, and versatility is further improved.

1 is a side view of an agricultural tractor to which the present invention is applied. It is a principal part rear view of a dashboard. (A) thru | or (F) are the top view of a spacer, a left view, a rear view, a right view, a front view, and a bottom view. (A) thru | or (C) are the perspective view which shows the attachment structure of a 1st key switch, a principal part perspective view, and a side view. (A) And (B) is the perspective view and side view which show the attachment structure of a 2nd key switch. (A) is a perspective view which shows the attachment structure of a 3rd key switch, (B) is a perspective view which shows the attachment structure of the 3rd key switch seen from the angle different from (A), (C) FIG. 5 is a side view showing a mounting structure of a third key switch.

  FIG. 1 is a side view of an agricultural tractor to which the present invention is applied. The tractor shown in the figure is a kind of work vehicle. The tractor includes a traveling machine body 1 and a rotary tiller (work machine) 3 connected to a rear portion of the traveling machine body 1 via a lifting link 2 so as to be lifted and lowered. ing.

  The traveling machine body 1 is mounted with an engine (not shown) covered by a bonnet 8 on a front portion of a chassis 7 supported by a pair of left and right front wheels 4 and 4 and rear wheels 6 and 6, and behind the hood 8 on the chassis 7. The control unit 9 is installed in The steering unit 9 includes a seat 11 on which an operator is seated, a dashboard 12 which is a front operation unit disposed in front of the seat 11, a steering handle 13 supported on the upper back side of the dashboard 12, and a dashboard 12 And a floor surface 14 formed at a low position between the sheets 11.

  An operator seated on the seat 11 performs a steering operation by holding the steering handle 13 and driving the traveling body 1 forward by driving the rotary rotary device 2 in the lowered state to drive the tiller. .

  FIG. 2 is a main part rear view of the dashboard. The dashboard 12 includes a main body cover 16, and an inclined surface 17 inclined upward toward the front is formed on the back side of the main body cover 16. A meter panel is fitted and fixed to the upper half of the inclined surface 17. While the panel hole 16a to be installed is drilled, the lower half has a notch-like shape whose rear side is opened so that a rotating shaft (not shown) inclined backward is inserted above the steering handle 13. A steering installation portion 16b and a mounting hole 19 for mounting the cylindrical key switch 18 are formed. The mounting hole 19 is located on one side of the steering handle 13.

  Next, a method of attaching the key switch 18 to the attachment hole 19 and the structure thereof will be described with reference to FIGS.

  3A to 3F are a plan view, a left side view, a rear view, a right side view, a front view, and a bottom view of the spacer, and FIGS. 4A to 4C are views of the first key switch. It is the perspective view which shows an attachment structure, the principal part perspective view, and a side view. A plurality of types of key switches (key cylinders) 18 having different diameters and engaging positions can be attached to the mounting holes 19. The method of mounting the key switch 18 in the mounting hole 19 will be described. By switching whether or not the ring-shaped spacer 21 is interposed between the periphery of the mounting hole 19 and the outer periphery of the key switch 18, the mounting hole A plurality of key switches 18 having different diameters can be inserted into 19 and fixed.

  Incidentally, the ring-shaped spacer 21 is formed in a C-ring shape, and is fitted and fixed in advance in the mounting hole 19 before the key switch 18 is inserted into the mounting hole 19 from the front side (inner surface side) and fixed. The detailed configuration of the spacer 21 will be described later.

  There are three types of key switches 18 that can be mounted. One is a first key switch (type A) 18A that has a large diameter and does not require a spacer 21, and the other two are small diameters that require a spacer 21. A second key switch (type B) 18B and a third key switch (type C) 18C. By the way, each key switch 18 is started by inserting the key 22 (see FIGS. 4 to 6) and rotating it to one side (the rotation amount includes less than one rotation, the same applies hereinafter). While the switch (not shown) is turned ON to start the engine, the start switch is turned OFF and the engine is stopped by rotating the engine from the engine start position to the other side.

  First, the attachment of the first key switch 18A will be described with reference to FIGS. The key switch 18A includes a cylindrical rotor case 24 in which a key rotor 23 into which a key 22 is inserted is accommodated so as to be rotatable about an axis, and a portion near one end of the rotor case 24 includes a screw portion 26 having a screw on the outer periphery. On the other hand, the portion closer to the other end has a larger diameter than the screw portion 26 and serves as an accommodating portion 27 that is located and accommodated on the front surface side that is the inner surface side of the main body cover 16. Incidentally, when the key 22 is rotated, the key rotor 23 rotates integrally with the key 22.

  Flat engagement surfaces 26 a and 26 a that are notched in a D-cut shape and extend in the axial direction are formed on a part of the outer peripheral surface of the screw portion 26, and the engagement surfaces 26 a and 26 a are the peripheral surfaces of the screw portion 26. A pair is provided so as to have a symmetrical shape at a symmetrical position with respect to the axis.

  The outer peripheral surface of the housing portion 27 is formed so as to gradually decrease in diameter toward the screw portion 26 side. However, the end portion on the screw portion 26 side that is the minimum diameter of the housing portion 27 is also smaller than the screw portion 26. Is formed in a large diameter and becomes a portion that contacts the inner surface side of the body cover 16. Incidentally, an annular flange portion 28 extending outward in the radial direction is formed in a portion near the screw portion of the housing portion 27.

  On the other hand, the mounting hole 19 is formed in a circular step portion 29 protruding rearward in a plurality of steps (two steps in the illustrated example). Furthermore, a concave surface 29a that is recessed forward is formed on the protruding end side that protrudes rearward of the stepped portion 29, and a circular mounting hole 19 is formed in the flat bottom surface of the concave surface 29a. .

  The mounting hole 19 has the same diameter as that of the screw portion 26 of the first key switch 18A, and the inner peripheral edge thereof is viewed in the axial direction of the arc portion 31 along the outer peripheral surface of the screw portion 26 and the engaging surface 26a of the screw portion 26. The mounting hole 19 has a D-shape as a whole, and is composed of a straight portion 32 that connects both ends of the arc portion 31. In addition, engaging grooves 33 and 34 that are recessed radially outward are respectively provided at the lowermost end and the uppermost end of the arc portion 31 of the mounting hole 19, and a fitting recess 36 is provided in the arc portion 31. A plurality are formed at predetermined intervals in the circumferential direction.

  When the threaded portion 26 of the key switch 18A is inserted into the mounting hole 19 from the inner surface side of the main body cover 16, one of the pair of engaging surfaces 26a, 26a on the outer periphery of the key switch 18A is The key switch 18A is engaged with the mounting hole 19 in a state where the key switch 18A is in contact with the linear portion 32 and the rotation around the axis of the key switch 18A is restricted (specifically prohibited), and the screw portion 26 of the key switch 18A is The main body cover 16 protrudes to the outer surface side. The key switch 18A is dashed by tightening a mounting nut 37, which is a cylindrical mounting tool having an inner periphery, on the outer periphery of the screw portion 26 protruding to the outer surface side of the main body cover 16. It is fixed to the board 12 (specifically, the main body cover 16).

  Incidentally, a flange portion 37a fitted and accommodated in the concave surface 29a is integrally formed at the end of the mounting nut 37 on the main body cover 16 side, and when the first key switch 18A is mounted, the flange portion 37a. Is fixed to the concave surface 29a.

  FIGS. 5A and 5B are a perspective view and a side view showing the mounting structure of the second key switch. As shown in FIGS. 2, 3, and 5, the second key switch 18 </ b> B is inserted and fixed in the mounting hole 19 in which the spacer 21 is fitted and mounted.

  The spacer 21 includes an insertion portion 38 whose outer diameter (outer diameter) is set to be the same as the diameter of the mounting hole 19, and a flange-like locking portion 39 integrally formed on one end side of the insertion portion 38. Have. The locking part 39 has a larger diameter than the insertion part 38. An engagement slit (engagement portion) 40 to be engaged with the second key switch 18B is formed at the upper end portion of the circumferential surface of the spacer 21, and the engagement slit 40 is formed in the entire insertion direction of the spacer 21 (insertion portion). 38 and the locking portion 39), the spacer 21 as a whole has the above-mentioned C-ring shape by the engagement slit 40.

  A flat notched engaging surface 41 corresponding to the straight portion 32 of the mounting hole 19 is formed on the outer peripheral surface of the inserting portion 38, and the sectional view of the inserting portion 38 (viewed in the inserting direction) is formed by the engaging surface 41. The shape is formed in the same D shape as the mounting hole 19.

  Further, an engagement recess (engagement portion) 42 is formed in a notch shape at the lower end portion of the insertion end surface of the insertion portion 38 (a symmetric position with the spacer 21 axis of the engagement slit 40 interposed therebetween). The engagement recess 42 is recessed behind the spacer 21 and the insertion direction side of the spacer 21 is opened.

  Further, a fitting convex portion 43 that is concavo-convexly fitted with the fitting concave portion 36 is integrally formed at a portion where the fitting concave portion 36 of the insertion portion 38 is located so as to protrude radially outward. Incidentally, the radially outer end surface of the engaging convex portion 43 protrudes to a position that is flush with the outer peripheral surface of the flange-shaped locking portion 39.

  By inserting the insertion portion 38 of the spacer 21 into the attachment hole 19 from the outer surface side of the main body cover 16 so that the engagement surface 41 and the linear portion 32 are in contact with each other, The protrusions 43 are concavo-convexly fitted in the corresponding fitting recesses 36, the engagement slit 40 and the engagement groove 33 are completely overlapped in the insertion direction view, and the locking part 39 is the concave shape on the main body cover 16 side. The spacer 21 is fitted and fixed in the mounting hole 19 in contact with the bottom surface of the surface 29a.

  On the other hand, the second key switch 18B is formed in a circular cross-sectional view having the same diameter as that of the spacer 21 in which the diameter of the screw portion 26 is smaller than that of the mounting hole 19, and the end portion on the side of the accommodating portion 27 of the screw portion 26. An engaging protrusion (engaging portion) 44 that engages with the engaging slit 40 and the engaging groove 33 described above is integrally formed on the upper end portion of the member. Unlike the first key switch 18A, the collar portion 28 is not provided. Further, as the fixture 37, a cylindrical member in which the flange portion 37a is omitted and a screw is formed on the inner periphery is used.

  When installing the second key switch 18B on the main body cover 16, first, the spacer 21 is fitted into the mounting hole 19 as described above, and then the screw portion 26 of the second key switch 18B is attached to the main body cover 16. When the engagement protrusion 44 is engaged with the engagement slit 40 and the engagement groove 33 from the inner surface side of the spacer 21 to the inner peripheral side of the spacer 21, rotation around the axis of the second key switch 18B is restricted ( Specifically, the threaded portion 26 of the second key switch 18B protrudes from the outer surface side of the main body cover 16 in a state where it is prohibited, and a fitting 37 is screwed onto the projecting threaded portion 26 and tightened. The second key switch 18A is attached and fixed to the main body cover 16.

  FIG. 6A is a perspective view showing the mounting structure of the third key switch, and FIG. 6B is a perspective view showing the mounting structure of the third key switch viewed from an angle different from FIG. C) is a side view showing the mounting structure of the third key switch. As shown in FIGS. 2, 3, and 6, in the third key switch 18 </ b> C, the diameter of the screw portion 26 is set smaller than that of the mounting hole 19 and the same as the inner diameter of the spacer 21.

  An engagement protrusion (engagement portion) 46 that engages with the engagement recess 42 and the engagement groove 34 described above is integrally formed at the lower end portion of the end portion on the housing portion 27 side of the screw portion 26. . Moreover, the collar part 28 is not provided similarly to the 2nd key switch 18B.

  When installing the third key switch 18C on the main body cover 16, first, the spacer 21 is fitted into the mounting hole 19 as described above, and then the screw portion 26 of the third key switch 18C is attached to the main body cover 16. When the engagement protrusion 46 is engaged with the engagement recess 42 and the engagement groove 34 from the inner surface side of the spacer 21 to the inner peripheral side of the spacer 21, rotation around the axis of the third key switch 18C is restricted ( Specifically, the screw portion 26 of the third key switch 18C protrudes from the outer surface side of the main body cover 16 in a state in which it is prohibited, and a fitting 37 is screwed onto the protruding screw portion 26 and tightened. The third key switch 18C is attached and fixed to the main body cover 16.

  Incidentally, when the third key switch 18C is attached to the main body cover 16, the inner peripheral diameter (inner diameter) of the end of the attachment 37 on the main body cover 16 side is accommodated so that the spacer 21 is accommodated on the inner peripheral side of the attachment 37. ) Is enlarged as compared with the inner diameter of the other portion to form an accommodating portion (not shown).

  According to the mounting method and structure of the key switch 18 configured as described above, a plurality of surrounding key switches 18A and 18B having different diameters (specifically, the diameters of the screw portions) can be switched by switching the presence or absence of the spacer 21. , 18C can be attached to the same type of dashboard 12, so that versatility is improved and manufacturing costs can be kept low.

  Further, since a plurality of engaging portions 40 and 42 that engage with the key switches 18B and 18C are formed on the inner peripheral side of the spacer 21, a plurality of types of key switches 18B and 18C having different engaging positions are connected to the spacer 21. Therefore, the versatility of the spacer 21 is also improved.

  Incidentally, when a plurality of types of key switches 18A, 18C, 18B having different diameters are attached to the dashboard 12, in the conventional case, mounting corresponding to the key switches 18C, 18B is performed in a later process after the dashboard 12 is formed. The hole 19 needs to be drilled, and the manufacturing cost is increased by the processing cost. However, according to the mounting method and the structure of the key switches 18A, 18C, and 18B described above, such a post-process is not necessary.

12 Dashboard 18 Key switch (Key cylinder)
19 Mounting hole 21 Spacer 40 Engagement slit (engagement part)
42 Engaging recess (engaging part)

Claims (4)

  A mounting hole (19) is drilled in the dashboard (12), and a cylindrical key switch (18) to be rotated is inserted into the mounting hole (19), whereby the key switch (18) is inserted. A key switch mounting method for mounting on a dashboard (12), wherein a ring-shaped spacer (21) interposed between the periphery of the mounting hole (19) and the outer periphery of the key switch (18) is provided in the mounting hole. (19) A method of attaching a key switch that allows a plurality of types of key switches (18) having different diameters to be attached to the dashboard (12) by switching whether or not they are fitted and mounted.   This is a key switch mounting structure in which a cylindrical key switch (18) to be rotated is inserted through a mounting hole (19) drilled in a dashboard (12), and is attached to the mounting hole (19). A key switch mounting structure in which a ring-shaped spacer (21) interposed between the periphery and the outer periphery of the key switch (18) can be detachably mounted in the mounting hole (19).   The key switch mounting structure according to claim 2, wherein the spacer (21) mounted on the outer periphery of the key switch (18) is formed in a C-ring shape.   Either of Claim 2 or 3 which provided the engaging part (40,42) engaged with this key switch (18) in the inner peripheral side of the spacer (21) with which the outer periphery of a key switch (18) is mounted | worn. The key switch mounting structure described in Crab.

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