JPS62163861A - Steering wheel - Google Patents

Abstract

PURPOSE:To stabilize the dimensional accuracy by constructing a boss to be fitted over a steering shaft with upper and lower members having annular projections on the facing endfaces, then performing resistance welding while holding a spoke core metal in a recess between both members. CONSTITUTION:A steering wheel comprises a boss section 1 and an annular rim section 2 which are coupled to each other through a spoke section 3, and the boss section 1 is provided with a metallic boss 5a to be coupled and screwed to a serration section 4a and a tapered section 4b of a steering shaft 4. A spoke core metal 6a is secured through welding to the outside section of said boss 5a. Here, the boss 5 is constructed with an upper side member 12a having a serration hole 11 and a lower side member 14a having a tapered hole 13. Said members 12a, 14a are integrated through resistance welding while being pressurized in the approaching direction under such condition where the core metal 6a is fitted in a recess 17a formed by abutting annular projections 15, 16 formed on the facing endfaces.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a boss of a steering wheel of an automobile, etc., and in particular, an upper member and an upper member obtained by dividing a boss into a steering shaft in the axial direction. The spoke core metal is fixed between the pair of upper and lower members.

[Conventional technology]

Used as a steering wheel for automobiles, etc. in 1982.
There is one shown in Publication No. 59473.

This steering wheel consists of a pair of members (flange-shaped members) that divide the boss (steering wheel attachment body) into two parts (up and down in the axial direction).
Then, the spoke is inserted into the concave hole formed between this pair of members.

(Problems that the invention attempts to solve) However, the spokes shown in the above publication have a tendency to rattle against the boss (handle handle body), and furthermore, Since the part 41 (5-shaped member) was fixed with a plurality of screws, it was troublesome to form the screw holes and work with pumice stone, and the manufacturing process was complicated as it required many pounds of parts.

The present invention has been made in view of the above points, and is composed of an upper member and an upper member that are divided in the axial direction from a boss fitted to the steering cylinder cylinder 11f 1-, and a spoke is provided between the pair of upper and lower members. J on the steering wheel that fixes the core metal.
3. This eliminates rattling of the spoke core metal relative to the boss and facilitates manufacturing. In addition, the upper member,
The purpose is to improve the precision of the integration of the upper member and the spoke core metal, and to facilitate the installation.

[Means for Solving the Problems] The present invention provides for the bosses 5a, 5b, 5c to be fitted into the steering shirt l-4 to be axially separated by a portion A11 and a metal fitting Fs.
``A'' consists of an upper part U12a, 12b, 12c and a metal upper member +4a, 14b, 14c, and this pair of upper and lower members 12a, 14a, 12b
Regarding the steering wheel in which metal spoke cores 6a, 6b, and Gc are fixed between 14b, 12C, and 14C (J86 and C1 above upper part tJ12a
, +2b, lower part of 12c and -F fertilizer side (4
At the top of 14a, 14b, 14c (17i6 defining parts 13.19 are formed to face each other thickly, and the upper part i;
Weld the lower parts of 12a, 12b, and 12c to the upper parts of the spoke cores Ga, 6b, and GC.
The upper parts of the two lower parts 44t4a, 14b, 14c are welded to the lower parts of the spoke cores 6a, 6b, 6c, and the upper parts 12a, 12b, 12c are positioned, and the part 18 and the upper parts 14a, 14b are welded.
, Nc's I;I U'l determining portion 19 is brought into contact.

[Effect]

The steering wheel of the present invention includes spoke core metal 6a,
6b, Gc to the upper members 12a, 12b, 1
2c and upper members 14a, 14b, 14c welded together, spoke core metals 6a, 6b,
6c,''-side member 12a, 121).

12c and the upper members 14a, 14b, 14c, and at this time, the upper members t2a, 12
b, 12c and lower part 1tJ14a, 14b
, 14c positioning portion 18. The viscosity of the unit during welding is such that the viscosity of the weld is k J-, <.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a steering wheel. This steering wheel has a shape in which a boss part 1 and an annular rim part 2 around the boss part 1 are connected by spoke parts 3.
is equipped with a metal boss 5a that is coupled and screwed to the serration part 4a and the tapered part 4b of a steering shaft 4 of an automobile, etc., and the metal round rod of the spoke part 3 is attached to the outer side of the boss 5a. The central arcuate portion of the spoke core metal 68 is fixed by welding, and the rim core metal 7 of the rim portion 2 is fixed to the end of this spoke core metal 68 by welding.

In addition, 8 is a soft synthetic resin outer cover of the rim part 2 that covers the rim core metal 7, 9.10 is a synthetic resin cover of the boss part 1 and the spoke part 3, and 1° is the boss 5a. ,
As shown in FIGS. 3 and 4, an upper member 12a is provided with a serration hole 11 that fits into the serration portion 4a of the steering shirt l-4, and a tapered portion 4b of the steering shaft 4 fits into the upper member 12a. The pair of upper and lower members 12a and 14a are connected to the spoke core metal 6.
It is integrated by welding with 8.

Then, when the upper member 12a and the lower part 4A14a are integrated, a center portion of the spoke core metal 68 is placed around the serration hole 11 on the lower end surface of the upper member 12a facing the upper member 14a. An annular convex portion 15 with an outer diameter inscribed in the arcuate portion is formed, and the upper member 14a
On the upper end surface facing the upper member 12a, a convex portion 16 having an outer diameter of 11 is formed around the tapered hole 13 and inscribed in the central arc-shaped portion of the spoke core Ga. Divide the parts 112a and 14a with silk to form each convex part 15.
With the tip surfaces of 113 in contact with each other, both members 12a,
The straw boss 5a on the outside 11 of the protrusion 15.10 between 14a
Diameter J of the spoke core metal 68 on the outer periphery of the rim: four narrow parts 1
7a is formed, and as shown in FIG. 4, the convex portions 15. I
G is engaged with the inner side of the central arc-shaped portion of the spoke core metal 68, and both members 12a and 14a are positioned coaxially, and both members t2a and 14 are welded using the electrode of the resistance welding machine.
Resistance welding is performed while applying pressure in the direction of a approaching each other.

Then, the spoke core metal 6a and both members 12a, 14a
, that is, the upper part and upper side part 1 of the spoke core metal 6a.
Welding current flows between the lower part of the spoke core metal 6a and between the lower part of the spoke core metal 6a and the upper part of the upper member 14a, melting each other, and the upper and lower parts of the spoke core metal 68 are brought closer together by the pressurizing force. and both members 12a,
14a is welded, and both members 12a.

The convex portions 15 and 16 of 14a approach and finally, as shown in Fig. 4 (Q
Welding is completed with the tip surfaces of each convex portion 15 and 16 in contact with each other as shown in FIG.

In this case, the pressure stroke of the electrode is not constant, but is made free, and welding is performed by adjusting the pressure force and welding current of the electrode, but until the tip surfaces of each convex part 15 and Since the areas are only the upper and lower parts of the spoke core metal 6a and are relatively small, the electrical resistance to the welding current is relatively large, and the upper and lower parts of the spoke core metal 68 generate heat and melt due to the welding current, and this part Welding of the spoke core metal 68 and both members 12a and 14a and both members 1
2a and 14a continue to approach, and each convex portion 15
．． When the tip surfaces of 16 are in contact with each other, as shown in Fig. 4 (13), the area of the press-welded part increases and decreases, so the electrical resistance to the welding current decreases, and the heat generated by the welding current in the press-welded part is reduced. At the same time, the contact of the tip surfaces of the respective convex portions 15 and 16 acts as a mechanical resistance or stopper against the approach of both members 12a and 14a, and the spoke core metal 68
Welding of both members 12a and 14a and both members 12a
, 14a is no longer approached, and each convex portion 15.1
The tip end surface of 6 becomes the positioning part 18, 19, and both members 1
2a and 14a are positioned.

Therefore, the upper member 12a and the upper member 14a are coaxially positioned by the engagement of each convex portion 15.16 with the spoke core metal 6a, and also the distal end surface of each convex portion 15.16, that is, the positioning portion 18.19. Both members 12a are brought into contact with each other.

The dimensional accuracy in the axial direction between 148 and 148, that is, the axial quality accuracy of the boss 5a, is stable, and even if the electrode is somewhat worn out, the length accuracy of the boss 5a is always constant, so the electrode can be kept as it was originally. It can be used until the end of its life.

Therefore, in addition to the serration holes 11 and the tapered holes 13, the upper member 12a and the upper member 14a have a convex portion 15°1.
G is formed, but these are all members 12a.

Both members 12a can be formed on one end surface of 14a.

14a can be easily processed.

Further, FIGS. 5 and 6 show an embodiment corresponding to a spoke core metal 6b made of a left-right split type round bar with a gold content of m%.

In this embodiment, the upper member 1 forming the boss 5b is 174.
2b and upper member 1. Concave grooves 21 for the ends of the left and right spoke core metals 6b are provided at opposite ends of the lb.
．． 22 are formed radially, and a plurality of pairs of engagement recesses 23 and engagement protrusions 24 that engage with each other are formed, whereby the engagement recesses 23 and engagement protrusions 24 of each month are engaged. With the end surfaces of both members 12b and 14b in contact,
The outer part between both members 12b and 14b, that is, the boss 5b
Four portions 17 smaller than the diameter of the spoke core metal 6b are formed on the outer peripheral surface of the spoke core 6b.
b is formed, and as shown in FIG. 6(A), with the concave grooves 21 and 22 of both members 12b and 14b engaged with the end of the spoke core metal 6b, a resistance welding machine is used. Resistance welding is performed while pressing both members 12b and 14b in a direction toward each other using the electrode.

Then, the spoke core metal 6b and both members 12b, 14b
A welding current flows between the press-contact parts of the spoke core 6b and the groove 21 of the upper member 12b, and between the lower part of the spoke core 6b and the groove 22 of the upper member 14b.
Both members 12b and 14b approach each other due to the pressure applied to the upper and lower parts of the spoke core 6b.
The concave grooves 21.22 of the parts 12b and 14b are welded, and the end surfaces of the members 12b and 14b approach each other, and finally, as shown in FIG. 6(B), the parts 12b and 1
Welding is completed when the end surfaces of 4b are in contact with each other.

Although detailed explanation will be omitted, in this embodiment, the end surfaces of both members 12b and 1.4b are located at the positioning portion 18°1.
9, both members 12b and 14b are positioned in the axial direction during resistance welding, and as a result, the length of the boss 5b in the ijd direction becomes constant, and both members +2b
, 14b, the engagement between the engagement recess 23 and the engagement protrusion 2.1 prevents the two members + 2b and 14b from slipping,
Both members +2b, 14b are positioned coaxially.

Further, FIGS. 7 and 8 show an embodiment corresponding to a spoke core metal 6C made of a metal plate. A3
The plate-shaped spoke core metal 60 of this embodiment is left exposed and serves as a spoke portion.

In this embodiment, the boss 5c (constituting the upper member 12
c and the opposing end surfaces of the upper member 14c, respectively, tl,
Glue with the same shape as the center square hole 31 of the spoke core metal 6C,
In addition to forming the engaging recess 32 and the engaging protrusion 33 that engage with each other, a plurality of concentric welding protrusions are formed around the engaging recess 32 and the engaging protrusion 33. By forming strips 34 and 35, the engagement recess 32 and the engagement protrusion 33 are engaged, and the bottom of the engagement recess 32 and the top of the engagement protrusion 33 are in contact with each other, and both members 12c A spoke core metal 6C is placed on the outside of the engagement convex portion 33 between , 14C, that is, on the outer periphery of the boss 5C.
The recess 17c, which is narrower than the plate thickness, is the welding ridge 34.35.
As shown in Fig. 8), the spokes and El
Engage the square hole 31 of gold 6C and the engagement recess 32 of -■- side part i) 12C, and turn both parts 12c and 14c of -C.
l! With II determined, resistance; 718 aircraft's small rotation, J, S, both parts (A12c, 14c @-
Resistance welding is performed 11 times while applying pressure in the direction approaching T4.

Then, Su! 1ζ-ri core metal 6C and both parts 1412c,
Pressure section 1 of 14c 'j'j Between the upper part of the straw spoke core 6C and the welding ridges 3 and 1 of the 1 side member 12c, and below the lower part of the spoke core ↑Gc o+i member + 4c) 8 contact flame strip :
15, the welding current flows and the welding ridges 34 of both members 12c and 14c are melted, and as the pressure force brings both members 12C and 14c closer to each other, the lower part of the spoke core metal 6C and the welding ridges 34 of both members I2c and 14c. 35 is welded, the bottom of the engagement recess 32 of the second side member 12c and the top of the engagement protrusion 33 of the upper member 14c approach each other, and most importantly, as shown in FIG. 8 (3). As shown, when the bottom of the engagement recess 32 and the top of the engagement convex 33 are in contact with each other, welding is completed.

Although a detailed explanation will be omitted, in this embodiment, the bottom of the engagement recess 32 of the upper member 12e and the first side member 14C
The top of the engaging convex portion 33 becomes the positioning portion 18.49, and the 'M Zj of both members 12c and 14c during resistance welding.
As a result, the length of the boss 5C in the axial direction becomes constant, and by the engagement of the engagement recess 32 and the engagement protrusion 33, both members 12c and 14c are positioned coaxially.

In each of the above embodiments, the upper and lower pairs of members 12a and 14a, 12b and Ll, b, 12c and 1
4C are both made of metal, but the convex members 12a and 14a
, +2b and 14b, 12c and 14c are formed separately, so each member 12a and 14a, 12b
And 14b, 12c and +4c can also be different E +A, for example, L side members 12a, +2
b, 12c can be made of mild steel or rust-free stainless steel, and the upper members 14a, 14b, 14c can be made of hard steel that can be easily removed from the i-bar part 4b of the sliding seats 1 to 4.

(Effects of the Invention) According to the present invention, by welding the spoke core metal to the upper member and the lower part (4) constituting the boss, the spoke core metal, the upper member, and the upper member Since the specie is integrated, the spoke core metal may rattle against the boss, but manufacturing is easy as there is no need for troublesome screw hole drilling or screw 6 work, and the number of parts is small. Furthermore, since the positioning parts of the upper member and the lower part H are brought into contact with each other during welding, the accuracy of integration during welding is improved and the dimensional accuracy is stabilized.

If the serration holes and tapered holes are formed separately in the side member and the upper member, the I) l machining of both members can be easily performed, and both members (respectively, using the appropriate 1111 method and the most suitable wood). Selection 4 is possible.

In addition, when welding both parts using electric resistance welding, the electric
By simply adjusting the force, it is possible to perform FL melting to the electricity of 4 (by freeing it without keeping the applied force of the car constant). The consumption of 7 and 19 degrees Cb゛\J method becomes constant at 1ζ (°, and it is possible to use the electrode for up to 4 lives. Work white/FJ + b (゛saru.

1. Drawings 1;) Brief Description Figures 1 to 4 show embodiments of the present invention, and Figure '1 is a longitudinal cross-sectional view of the steering wheel corresponding to the II view in Figure 2. 2 is a plan view thereof, FIG. 3 is an exploded perspective view of the boss, FIG. 4 is an explanatory diagram of the assembled state of the boss and spoke core metal, and FIGS. 5 and 6 are other embodiments of the present invention. , FIG. 5 is an exploded perspective view of the boss, FIG. 6 is an explanatory diagram of the assembled state of the boss and spoke core metal, and FIGS. 7 and 8 show still other embodiments of the present invention, FIG. 7 is an exploded perspective view of the boss and spoke core metal, and FIG. 8 is an explanatory view of the assembled state.

4... Steering shaft, 4a... Serration part, 4b - Tapered part, 5a, 5b, 5cm - Boss, 6a, 6b, ec... Spoke core metal, 11◆ - Serration hole, 12a, 12b, 12c --
Upper member, 13... Taper hole, 14a, 14b,
14c -- Upper member, 18.19... positioning part.

Figure 4 5th Yonekawa l

Claims (3)

[Claims] (1) A steering wheel consisting of a metal upper member and a metal lower member, each of which is a boss fitted to the steering shaft that is divided in the axial direction, and a metal spoke core fixed between the pair of upper and lower members. The wheel, wherein positioning portions are formed opposite to each other at a lower part of the upper member and an upper part of the lower member, the lower part of the upper member is welded to the upper part of the spoke core metal, and the upper part of the lower member is welded to the upper part of the spoke core metal. is welded to the lower part of the spoke core metal, and the positioning portion of the upper member and the positioning portion of the lower member are in contact with each other. (2) The steering wheel according to claim 1, wherein the upper member is provided with a serration hole for a serration portion to the steering shaft. (3) The steering wheel according to claim 1 or 2, wherein the lower member is provided with a tapered hole for a tapered portion of the steering shaft.