JPS62155372A - Boss part structure in pulley - Google Patents

Abstract

PURPOSE:To strengthen bonding of the wall bridge of overhang parts, by a method wherein overhanging parts are radially radiately formed to the cylindrical inner size part, engaged with a shaft, of the boss part of a pulley. CONSTITUTION:During press moulding, one or plural lock parts 7, functioning both as positioning and rotation stop, and radially radiately extended overhang parts 9, are formed in a non-circular inner part engaged with a shaft. A shape 19 of the extruded profile part of a boss part 5 is smaller than a profile shape 21 pushed in throughout a whole periphery. The more number of fillets 13 is formed on the non-circular cylindrical inner part engaged in a shaft, and bonding of a wall bridge 25 at the fillet is strengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pulley that is pivotally attached to a camshaft or the like, and relates to a structure of a boss part in a pulley in which a web part and a boss part are integrated.

(Technical Background of the Invention and Problems Thereof) A conventional pulley made of gold FF (I-made, forged, sintered metal, etc.) has a boss portion structure shown in FIG. 9, for example.

After inserting the shaft 105 into the shaft fastening hole 103 drilled in the center of the web portion 101 of the pulley, aligning the axes, and inserting and fixing the pin 107 that serves both for positioning and rotation prevention,
The shaft 10 is attached by a hexagonal bolt 111 through a washer 109.
5 was fastened and stuck.

Further, as another example, there is a structure of a boss portion of a pulley made of iron plate as shown in FIG.

This pulley is constructed by fitting a shaft 117 into a shaft fastening hole 115 drilled in the center of a web portion 113, aligning the axes with each other, and fitting and fixing a pin 119 that serves both for positioning and rotation prevention. A plurality of hex bolts 123 through
It was fastened and fixed to the shaft 117.

Both of the conventional examples have a pin that serves both for positioning and rotation prevention, and therefore requires hole machining. Furthermore, in order to prevent the bottle from being pulled out, it is necessary to use an unnecessarily large washer that covers the bottle, or to take other measures to prevent the bottle from being pulled out, which increases the number of parts and requires a large number of man-hours.

[Purpose of the invention]

This invention was devised in view of the above-mentioned problems, and has a 1M boss part in a pulley that minimizes the number of necessary parts, has better positioning accuracy, and has a stronger rotation.
The purpose is to provide a structure.

[Means for solving problems]

In order to achieve the object, this invention provides a metal plate with a
In addition to forming one or more shaft locking portions, a boss portion that fits into the shaft and a plurality of overhang portions projecting radially outward on the inner diameter portion of the fitting hole of the boss portion; A fillet was added to each corner of the part, and a shaft fastening hole was provided at the bottom of the end face of the boss part.

(Example) Embodiments of the invention will be described with reference to the drawings.

First Embodiment A first embodiment of this explanation will be described with reference to the drawings from FIG. 1 to FIG. 6.

First, an overall explanation will be given based on the front view and cross-sectional view of the pulley shown in FIGS. The boss portion 5 is embossed with one or more locking portions 7 (two in the drawing) that serve both for positioning and rotation prevention, leaving them in the radial inward direction. A plurality of radially extending projecting parts 9 are provided on the circular inner diameter part, and the wear part 3 and the boss part 5 are strongly connected to each other.

In this case, it goes without saying that the portion having the toothed portion provided on the circumference may be a separate piece.

Next, the structure of the boss portion of the present invention will be explained based on front views and sectional views shown in FIGS. 1 to 4.

During press molding, the metal plate is press molded at least once to emboss the shaft mounting part into a hollow cylindrical shape, leaving one or more locking parts 7 that serve as positioning and rotation prevention in the radial inward direction. Then, a plurality of overhanging portions 9 radially projecting outward in the radial direction are provided on the inner diameter portion of the occluded circle that fits into the shaft. do. However, the fillet 11 is not shown in FIG.

At the same time, a shaft fastening hole 17 is formed in the bottom end 15 of the end face of the boss portion.

With the above configuration, the extruded outline shape 19 of the boss portion 5 embossed from the metal plate integrated with the web portion 3 is as follows.
It is smaller than the contour shape 21 that is pushed in over its entire circumference.

Therefore, the connection of the extrusion part extends over the entire circumference, but the fillet 11 attached to the extrusion base of the inner diameter part that extends one arrow into the shaft is small, and the connection of the wall bridge 23 is weak.
By forming more fillets 13 on the radially projecting projecting part 9 on the inner diameter part of the hollow cylindrical shape that fits into the shaft, the connection of the wall bridge 25 in that part is strengthened. I can do it.

Furthermore, by appropriately configuring the punch and die so as to provide a protruding part 27 protruding from the side surface of the wear part 3 in the vicinity of the protruding part 9, the web part 3 around the boss part 5 can be
The remaining mass that has been displaced can be made to flow within the effective inner diameter range.

FIG. 3 shows an example in which a fillet 11 is attached to the base of the extruded portion.

3 and 4 are examples in which the shape of the overhanging portion 9 is an elliptical shape 29, and the pushed-in contour shape 21 and the extruded contour shape 19 partially match, and the dotted line shows the extruded contour shape 19. A contour shape 19 is shown.

Second Embodiment A second embodiment of the present invention will be described with reference to FIG.

In the second embodiment, when pushing out the boss portion having an inner diameter portion that fits into the shaft as the shaft attachment portion of the pulley as shown in the drawing, the locking portion 41 that serves both for positioning and rotation is cornered in the radial outward direction. It is molded together with the meat 43, and the other parts have the same structure as the first embodiment.

The part that serves as both positioning and rotation prevention is provided radially outward from the fitting hole with the shaft, so the distance between the fulcrums is long and the error angle during assembly is small, allowing for better positioning accuracy and greater strength. Ensures proper rotation prevention.

Third Embodiment A third embodiment of the present invention will be described with reference to FIG.

In the third embodiment, locking parts 7 and 41 were provided in the boss part for positioning and rotation prevention during press molding in the first and second embodiments, but in the water test 1, Instead, various examples will be shown in which a shaft fastening hole 47 having one or more bottle holes or key grooves 45 (key grooves are shown in the drawings) is provided in the bottom end 15 of the end face of the boss.

This embodiment can be manufactured at a lower cost than the conventional example.

C Effects of the invention] Since more fillets are provided in the radially outward projecting portion of the cylindrical inner diameter portion that fits into the shaft of the boss portion of the pulley, the connection of the wall bridge in that portion can be strengthened. The bottom end of the end face of the boss is firmly and effectively integrated with the web part, resulting in extremely high strength. It acts on the part.

In addition, as mentioned above, we have strengthened the connection of the wall bridge, ensured an effective depth of the inner diameter part into which the shaft fits, and reduced the thickness of the wear part, resulting in lighter wear parts and boss parts. can be formed.

Furthermore, by protruding the mouth of the cylindrical inner diameter part that fits into the shaft from the side of the web, the excess purchase of the wear part around the boss part flows into the effective range of the inner diameter part,
The effective depth of the hole in the inner diameter part can be deepened to near the plate thickness of the web part, so the effective depth of the inner diameter part into which the shaft fits can be ensured, making the plate thickness of the web part even thinner. In addition, the web portion and boss portion can be shaped to be more lightweight.

Furthermore, the shaft fastening hole formed at the bottom of the end face of the boss is for screw tightening or for screw tightening in an irregularly shaped hole that serves both positioning and rotation prevention, and is a large diameter cylindrical inner diameter that fits into the shaft. Since the axis of the shaft and the boss part are coaxial,
Bonding can be achieved with greater strength and better viscosity II.

As described above, the present invention can reduce the number of necessary parts, provide better positioning with a higher degree of fit, and provide a boss structure with stronger rotation prevention.

[Brief explanation of drawings]

FIG. 1 is a front view of main parts showing a first embodiment of the present invention, and FIG.
The figure is a partial sectional view taken along the line 8--1 in FIG. 1, FIG. 3 is a partial sectional view showing another example taken along the A-A line in FIG. FIG. 5 is a schematic overall front view of the present invention, and FIG.
7 is a front view of main parts showing the second embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along line C-C in the figure.
FIG. 9 is a detailed sectional view of a shaft coupling portion showing a conventional example, and FIG. 10 is a detailed sectional view of a shaft coupling portion showing another example of the conventional example. Explanation of the symbols representing the main parts of the drawings 1... Tooth section 11, 13. 4.3... Fillet 3.51... Web section 5... Boss section 15...
Stop bottom 7, 41...Locking part 17.47...Shaft fastening hole 9...Protruding part Patent applicant Fuji Kiko Co., Ltd. agent Patent attorney Yasu Miyoshi Man'j kidney'-:,':
',. 11-No ゛1γ]: °5・ Figure 7 Figure 9 Figure 8

Claims (1)

[Claims] One or more shaft locking parts are formed on the metal plate, and a boss part that fits into the shaft and the inner diameter part of the fitting hole of the boss part,
A boss in a pulley, characterized in that a plurality of projecting portions projecting radially outward, fillets are provided at each corner of the projecting portion, and a shaft fastening hole is provided at the bottom of the end face of the boss portion. Department structure.