JP3180110B2 - Pulley assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flanged pulley assembly.

[0002]

2. Description of the Related Art FIG. 7 is a side view of a conventional pulley provided with flanges on both sides. The pulley has flanges 3 on both end surfaces of a cylindrical portion 2 and a shaft is fitted to the center of the cylindrical portion 2. A shaft hole 4 is provided. Since the pulley shown in FIG. 7 has flanges 3 on both sides of the cylindrical portion 2, for example, in order to form it by resin molding, as shown in an explanatory view in FIG. Various techniques have been devised such as molding into four parts in the direction and two parts in the axial direction.

As described above, the outside of the pulley shown in FIG.
The mold 8 is divided into four parts in the circumferential direction to form a peripheral surface.
However, in the molding means using the mold 8 divided in the circumferential direction, the division and the molding operation direction of the mold 8 are different, and a central shaft hole is formed. To 2
Other be disadvantageous in a different mold and equipment cost of which is divided, Fig.
Although not shown in FIG. 7, the so-called parting line burrs remain on the outer peripheral surface of the cylindrical portion due to the axial division, so that removal of the burrs is unavoidable.

In the axial division structure, as shown in FIGS. 9 and 10, a structure is adopted in which fitting means having an asymmetrical shape with respect to an axis which is the center of the turning operation are used. The shaft hole 4 provided in the center of the cylindrical portion 2 provided with one flange 3 as shown in FIG, provided a flange 3 of the cylindrical portion 2 Tei
The asymmetrical fitting portion 9 is formed on the outer peripheral surface of the cylinder on the end surface side.
And a non-circular hole (9) corresponding to the asymmetrical fitting portion 9 is provided.
To form a pulley provided with both flanges. That is, it is difficult to secure the accuracy of the shaft hole in the divided members which are separated from each other, so that the fixing means other than the shaft fitting portion is formed so as not to divide the shaft hole.

[0005]

The conventional structure as described above has problems such as the cost of the mold and the maintenance of accuracy due to the coupling fitting means having an asymmetric shape with respect to the axis . .

[0006]

A pulley assembly according to the present invention is characterized in that each of the divided members comprises a flange, a cylindrical portion extending axially from one side of the flange, and a rib on the inner peripheral surface of the cylindrical portion. When, and a said rib and the <br/> recess integrally formed coupling protrusions at the tip of the rib is coupled to face each other, the respective impact of
A isomorphic member raised and the recess are fitted, are formed as sides flanged pulleys by fitted and the projection and recess formed in the dividing member of the people said husband, or each of the split members, and one of the flange portion A cylindrical portion extending in the axial direction from one surface of the flange portion, and a rib on the inner peripheral surface of the cylindrical portion; the other portion is opposed to the flange portion, the spigot portion on one surface of the flange portion, and the rib of the one split member; Is formed so as to have a parallel projection that sandwiches the same, and is configured to be formed as a pulley with both flanges by fitting the projections and the ribs to each other, or one of the divided members includes a flange and the A cylindrical portion extending in the axial direction from one surface of the flange portion, a rib on the inner peripheral surface of the cylindrical portion ,
And the other divided member has an outer diameter different from that of the one divided member.
Provided with a cylindrical portion having a recess and the projection corresponding to the projection and the recess of the one divided member are provided, the pulley assembly is constituted by fitted and both.

[0007]

[Action] In such a structure described above, it is possible to reduction of the cost factors are mold, such as a combination of the same shape, deer
Handling the even / or fitted means that the axially symmetric configuration
However, it is possible to obtain an excellent pulley assembly that is easy and advantageous in maintaining accuracy .

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an embodiment of a pair of divided members 1 according to the present invention as viewed from the joining surface side. Referring to FIG. 2, a cylindrical portion 2 extending in an axial direction from a flange 3 has an inner periphery. The surface forms a space, and ribs are formed at four places as the cylindrical portion holding means. FIG. 2 is a cross-sectional view of the pulley assembly shown in FIG. 1 in which the pair of divided members 1 shown in FIG. 1 are fitted to face each other, and as shown in FIG. 5-1 and recess 5
-2 is formed. The protrusion 5-1 and the recess 5-2 have fitting dimensions with each other, and are fitted to face each other as shown in FIG. 2 to form a pulley assembly. To integrally held as the pulley assembly, and inserted through the shaft member in the axial hole 4 of both the opposing concatenated with the same dimensions, Ru is pressed fixed. As shown in FIG. 2, the length of the cylindrical portion 2 forming the outer peripheral surface of the pulley is L1 of one of the divided members 1 and L of the other divided member 1.
2 and any size can be selected.

FIG. 3 and FIG. 4 are front views of another example according to the present invention. While one of the divided members shown in FIG. The other split member shown in FIG. 4 does not include the rib 5 and is formed with a plurality of pairs of protrusions 7 extending in parallel to the axial direction from the end face on which the flange 3 is formed. The parallel projections 7 are provided axially symmetrically corresponding to the ribs 5 of the one divided member, and are connected so that the two are opposed to each other to sandwich the respective ribs 5. 3 and 4 show
The cylindrical portions 4-1 are formed of concentric ribs 5 respectively.
Is formed so as to integrally connect and hold the center end of the
The inner peripheral surface of the cylindrical portion 4-1 forms the shaft hole 4.

In this example, the two divided members are not of the same shape, but the fitting connection is formed axially symmetrically, and the shaft hole 4 is opposed in the axial direction in the same manner as in the first example. The coaxiality is maintained by fitting the spigot portion 6.

FIGS. 5 and 6 show that one of the divided members 10 has a flange 3 and a cylindrical portion 2, and the other divided member 11 has a flange 3 and an inner peripheral surface of the one cylindrical portion 2 on one surface thereof. FIG. 6 shows an example of a stepped pulley formed by connecting different members having cylindrical portions having different dimensions. In the example of FIG. 5, one of the divided members 10 is shown in FIG.
An illuminating flange 3, a cylindrical portion 2 extending in an axial direction from one surface of the flange, and an inner peripheral surface of the cylindrical portion 2 provided on the other divided member 11.
Except for the part where the convex
Number of ribs 5, and the other divided member 11 is shown in FIG.
A flange portion 3 and a convex spigot portion 6 fitted to the inner peripheral surface of the cylindrical portion 2 provided on one of the divided members 10 on one surface of the flange portion 3
And a parallel protrusion 7 for holding the rib 5 provided on one of the divided members 10 on an end face of the spigot portion 6 , and a convex-shaped spigot portion 6 of the other divided member 11.
With fitted to the inner circumference of the cylindrical portion 2 provided on one of the dividing member 10, the cylindrical portion 2 of the split member 10 of the one by parallel projection 7 provided on the end face of the convex fitting portions 6 Is formed as a pulley with both side flanges by sandwiching a rib 5 provided on the inner peripheral surface of the roller.

Examples of [0012] Figure 6 is an example of the step pulley outer diameter dimension of the cylindrical portion 2, 2 'are linked to different members of the one divided member 12 and the other divided member 13. One split member 1
2 is provided with a flange 3, a cylindrical portion 2, a rib 5 on the inner peripheral surface of the cylindrical portion 2, a projection 5-1 at a tip of the rib 5, and a concave portion 5-2 .
Is, the flange 3 of the same outer diameter dimensions as the flange 3 of the one divided member 12 in the other divided member 13, a cylindrical portion 2 of the one divided member 12 is different from the cylindrical portion 2 of the outer diameter dimension 'is The tip
Third and a flange 3 'of the end face of the flange 3 of the same outer diameter dimensions as the flange 3 of the one divided member 12, the one divided member
12 are provided on the protrusion 5-1 and the recess 5-2 at the tip of the rib.
Opposing recesses 5-2 and projections 5-1 are provided.
-1 and the concave portion 5-2 are fitted together to form a stepped pulley. In each case, the fitting structure of the divided members is rib 5
Due protrusion 5-1 and the recess 5-2 formed at the tip of the rib 5 naturally fitting attachment means shown in above FIGS. 3 and 4
And a parallel projection 7 for holding the shaft hole.
Are axially opposed and connected.

The timing belt is engaged with the outer diameters of the cylindrical portions 2 and 2 'of the pulley according to the embodiment of the present invention described with reference to FIGS. 1, 2, 3, 4, 5 and 6. It is also possible to provide teeth to be used.

[0014]

Since the pulley assembly according to the present invention has the above-described structure, it is constituted by a combination of the same shapes, so that the cost factor of the mold and the like can be reduced, and / or the fitting means can be pivoted. also easy to handle and precise maintained by a symmetric configuration advantageously superior pulley assembly to obtain it is possible.

[Brief description of the drawings]

FIG. 1 is a front view of a divided member constituting a pulley assembly according to the present invention.

FIG. 2 is a cross-sectional view of a pulley assembly in which the split members shown in FIG.

FIG. 3 is a front view of one divided member constituting a pulley assembly according to a second embodiment of the present invention.

FIG. 4 is a front view of the other divided member of the second example used together with the divided member of FIG. 3;

FIG. 5 is a sectional view of a pulley assembly according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a pulley assembly according to a fourth embodiment of the present invention.

FIG. 7 is a side view of an example pulley according to the prior art.

8 is a fragmentary front view illustrating a divided mold forming the pulley of the example according to the prior art shown in FIG. 7;

FIG. 9 is a cross-sectional view of another example pulley assembly according to the prior art.

FIG. 10 is a front view of the example according to the prior art shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dividing member 2, 2 'Cylindrical part 3, 3' Flange 4 Shaft hole 4-1 Cylindrical part of shaft hole 5 Rib 5-1 Protrusion at the tip of rib 5-2 Depression at the tip of rib 6 Inlay part 7 Holds rib Parallel projections 8 Four-part mold 9 Asymmetrical fitting part 10, 11, 12, 13 Another divided member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 55 / 46,55 / 48

Claims (6)

(57) [Claims] 1. A pulley assembly flange on both sides are formed as an assembly of divided members for provided, <br/> dividing member forming the said pair has a shaft hole of substantially the same dimensions, the flange portion And a cylindrical portion extending in the axial direction from one surface of the flange portion, a rib on the inner peripheral surface of the cylindrical portion, a coupling projection and a concave portion integrally formed at the tip of the rib, and forming the pair. Formed on each member
The projections and recesses can be concentrically coupled to each other
A pulley assembly as described above , wherein the pulley assembly has a symmetrical arrangement and is formed as a double-sided flanged pulley by fitting the projections and recesses of the paired split members. 2. A pulley assembly flange on both sides are formed as an assembly of divided members for provided, <br/> dividing member forming the said pair has a shaft hole of substantially the same dimensions, the flange portion When a cylindrical portion which mutually different lengths extending from one side of the collar portion in the axial direction, and 該夫s rib of the cylindrical inner peripheral surface of the projection for coupling integrally formed at the tip of the rib recesses And the projection and the recess are symmetrical so that they can face each other and can be coupled concentrically.
And a pair of split members formed as pulleys with flanges on both sides by fitting projections and recesses of the paired split members. 3. A projection and the recess of people each integrally formed at the tip of the formed divided member rib constituting said pair claims, characterized in that, being formed alternately in the circumferential direction 1
Or the pulley assembly according to 2 . 4. A pulley assembly which is formed as an assembly of divided members because flanges are provided on both sides, wherein said pair of divided members have shaft holes of substantially the same size, one of which is a flange and said flange. A cylindrical portion extending in the axial direction from one side of the flange portion, and a portion into which the other convex spigot portion is inserted into the inner peripheral surface of the cylindrical portion;
And the other includes a flange and a convex spigot on one surface of the flange that fits with the cylindrical portion of the one divided member , and the inner periphery of the cylindrical portion of the one divided member. surface
Parallel projections for clamping the ribs provided on the other, the other convex inlay portion is fitted to the inner peripheral surface of one cylindrical portion, and the one rib is connected to the other convex inlay portion. A pulley assembly characterized by being formed as a double-sided flanged pulley by being sandwiched between parallel projections provided on the end face of the pulley. 5. A pulley assembly having a diameter difference formed by axially connecting independent divided members, wherein the pair of divided members has a shaft hole having substantially the same dimensions, Is provided with a flange portion, a cylindrical portion extending in the axial direction from one surface of the flange portion, a rib on the inner peripheral surface of the cylindrical portion, a coupling projection integrated with the tip of the rib, and a concave portion, and the other divided portion. The member is the one collar
A flange having the same diameter as the flange , and extending in an axial direction from one side of the flange.
A cylindrical portion having a diameter different from the one above, and the other end of the cylindrical portion.
A flange having a diameter different from that of the flange, and the one flange and
The other side of the flange of the same diameter
The connection projection that is provided at the tip and the connection
The joint projection and the concave portion are integrally provided, and
Protrusion and recess for connecting the member and recess for connecting the other split member
To form stepped pulleys with different diameters.
And a pulley assembly. The cylindrical outer peripheral surface of 6. dividing member forming the pair, any one of the preceding claims that irregularities for driving the timing belt is formed, and wherein
3. The pulley assembly according to claim 1.