JPH09264337A - Cast parts with assembly engagement - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To finish inserts with high accuracy by sintering, and to reduce processing steps after casting. SOLUTION: In a casting part having an assembling engaging part with another part, and this assembling engaging part is formed by an insert 30, the insert 30 is formed by sintering. The surface of a part of the insert 30 is aligned with the surface of the casting material and exposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast part having an assembling engagement portion used in a motorcycle or the like.

[0002]

2. Description of the Related Art For example, there is a boss clutch provided in a multi-plate friction clutch as a cast component having an assembling engagement portion. The multi-disc friction clutch has a clutch housing on the input side and a boss clutch on the output side, and is provided with a plurality of friction plates alternately stacked between them. The friction engagement of these friction plates interrupts the power. Output from the boss clutch via the output shaft. This boss clutch has, for example, an assembling engagement portion with the output shaft of another component, and this assembling engagement portion is formed by an insert. Composed.

[0003]

However, the insert is formed of a single piece of cast iron, and each flat surface portion is subjected to lathe machining.
Then, the cast iron insert is inserted to cast the boss clutch, both ends of the cast iron insert are processed again, and the spline is formed by broaching, which increases the processing cost.

The present invention has been made in view of the above points, and provides a cast component having an assembly engaging portion capable of finishing an insert with high accuracy by sintering and reducing a working process after casting. Is intended.

[0005]

In order to solve the above-mentioned problems and to achieve the object, the invention according to claim 1 has an assembling engaging portion with another component, and this assembling engaging portion. In a cast component having an assembly engaging portion formed by an insert, the insert is formed by sintering, and a part of the surface of the insert is aligned with the casting material surface and exposed. I am trying. By forming the insert by sintering and exposing a part of the surface of the insert so as to be aligned with the surface of the casting material to be finished with high accuracy, it is possible to reduce the processing steps after casting.

According to a second aspect of the present invention, the cast component is a boss clutch used in a multi-plate friction clutch, and a concave-convex engaging portion that engages with an output shaft of the other component is provided on an inner peripheral surface of the insert. It is characterized by being formed. Since the insert of the boss clutch is formed by sintering and has the concavo-convex engaging portion, the processing steps after casting can be reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, with reference to the accompanying drawings, an embodiment of a cast component having an assembling engagement portion according to the present invention will be described in detail. 1 is a cross-sectional view of a multi-disc friction clutch, FIG. 2 is a plan view of a boss clutch, FIG. 3 is a cross-sectional view taken along line III-III of FIG.
4 is a sectional view taken along the line IV-IV of FIG. 2, FIG. 5 is a plan view of the insert, FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, and FIG. 7 is an enlarged view of the joint between the boss clutch and the insert. It is a figure.

In the drawings, reference numeral 1 is an input shaft which is interlocked with a crankshaft of an engine, and is rotatably supported by an engine case 2 through a bearing 3 and has a primary gear 4 at an end thereof.
Is provided. An output shaft 7 is rotatably supported by an engine case 2 via a bearing 8 in parallel with the input shaft 1, and a wet multi-plate friction clutch 9 is provided at an end of the output shaft 7 to provide wet multi-plate friction. The power of the engine is transmitted to the transmission (not shown) via the output shaft 7 by the clutch 9. The clutch housing 10 of the wet multi-plate friction clutch 9 has a rivet 11
It is fixed to the primary driven gear 12 together with the side plate 13 via the shaft so as to be integrally rotatable and is swingably provided by the damper spring 14.

The primary driven gear 12 meshes with the primary gear 4 and rotates integrally, and the damper spring 14
Absorbs impact force generated when power is transmitted from the clutch housing 10 to the boss clutch 15.

Split grooves 10a are formed in the clutch housing 10 at predetermined intervals in the axial direction, and a plurality of friction plates 17 are formed in the split grooves 10a on the outer periphery thereof.
It is arranged so as to engage with a and to be slidable in the axial direction. The boss clutch 15 is arranged inside the clutch housing 10 so as to be opposed to each other.
It is spline-engaged with a and is tightened and fixed by a nut 19 so as to be integrally rotatable. A washer 80 is interposed between the end of the output shaft 7 and the boss clutch 15, and a detent washer 81 is interposed between the boss clutch 15 and the nut 19.

The boss clutch 15 is formed with a plurality of axial dividing grooves 15a, and a plurality of friction plates 21 are formed in the dividing grooves 15a on the inner periphery thereof.
It is slidable in the axial direction by engaging 1a. The plurality of friction plates 21 are alternately superposed with the plurality of friction plates 17.

An appropriate number of bosses 15b are formed in the center of the boss clutch 15, and a pressure plate 22 is provided in the boss 15b by inserting the recess 22a. A spring 25 is contracted between a recess 22a of the pressure plate 22 and a washer 24 fixed by a bolt 23 screwed to the boss portion 15b of the boss clutch 15.
The spring 25 constantly urges the pressure plate 22 in the clutch connecting direction. By the pressing force of the pressure plate 22, the friction plates 17 and 21 are frictionally engaged with each other, and the rotational force of the clutch housing 10 is increased.
5, the output shaft 7 rotates integrally with the rotation of the boss clutch 15.

A flange portion 2 of a push rod 27 is provided at a central portion of the pressure plate 22 via a bearing 26.
7a is provided. The push rod 27 is supported by the clutch cover 90, and the rack 2 of the push rod 27 is supported.
A pinion 28a of the operating shaft 28 is engaged with 7b. A push lever 29 is fixed to the end of the operation shaft 28, and the push lever 29 is connected to the clutch lever via a wire (not shown).

Therefore, the clutch lever is actuated to rotate the operating shaft 28 via the push lever 29, whereby the push rod 27 moves and the pressure plate 22 in the clutch connected state moves against the spring 25. And put the clutch in the disengaged state.

The boss clutch 15 is annularly formed by aluminum alloy casting, as shown in FIGS.
The insert 30 of the boss clutch 15 is formed by sintering before casting the boss clutch 15. The sintering includes aluminum-based, iron-based, copper-based, stainless-based, and the like. In this embodiment, since the output shaft 7 is formed of iron, the same iron-based material is used and the output shaft 7 and The expansion rate is made uniform, and the tightening load of the nut 19 due to repeated expansion and contraction is prevented from decreasing.

As shown in FIGS. 5 and 6, the insert 30 is formed into a cylindrical body by a mold, and the flange portion 30a has convex portions 30b at six positions, so that the engagement with the boss clutch 15 is strong. It has become. A spline 30c is formed on the inner peripheral surface of the insert 30, and the spline 30c engages with the end portion 7a of the output shaft 7 so as to be integrally rotatable.

As shown in FIG. 3, the boss clutch 15 is formed by casting a fixed die A and a movable die B of die casting. L1 is the outer diameter of the washer 80, L2 is the insert 30
The outer diameter of the end face 30d of L, L3 is the insert 30 of the fixed mold A
Showing the outer diameter of the portion A1 facing L1, L2 larger than L1 and L3 larger than L2, and the portion A1 facing the insert 30 of the fixed mold A is shown in the arrow direction as shown in FIG. It is slightly movable. Therefore, during casting of the boss clutch 15, the portion A1 of the fixed mold A facing the insert 30 moves to absorb an error, and a gap is not formed between the fixed mold A and the insert 30, so that the molten metal is provided on the insert 30 side. To prevent wraparound.

The joint portion between the boss clutch 15 and the insert 30 can be constructed as shown in the enlarged views of FIGS. 7A to 7C. In FIG. 7A, the insert 30 has a negative error. FIG. 7B shows a case where the insert 30 is provided.
Shows the case where there is no positive / negative error, and FIG. 7 (c) shows the case where the insert 30 has a positive error.

In either case, the outer diameter L3 of the portion A1 facing the insert 30 of the fixed die A is the outer diameter L1 of the washer 80 and the outer diameter L of the end surface 30d of the insert 30.
2 is set to be larger than 2, and the step portion 100 shown in FIG. 7A or 7C and the burr portion 101 shown in FIG. 7B can contact the end surface 30d of the insert 30 without riding on the washer 80. I am trying.

In this way, the boss clutch 15 and the insert 30 are joined, and the end surface 30 of the surface of the insert 30 is joined.
Since d is exposed by aligning it with the casting material surface of the boss clutch 15 and finishing it with high precision, the number of processing steps after casting can be reduced. Further, in the boss clutch 15, the insert 30 is formed by sintering, and the spline 30c of the concave-convex engaging portion is formed on the inner peripheral portion 30c during sintering molding, so that it is possible to reduce processing steps after casting. it can.

[0021]

As described above, according to the first aspect of the invention, the insert is formed by sintering, the surface of a part of the insert is aligned with the surface of the casting material, exposed, and finished with high precision. Subsequent processing steps can be reduced.

According to the second aspect of the present invention, since the insert of the boss clutch is formed by sintering and has the concave and convex engaging portion, the working process after casting can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a multi-plate friction clutch.

FIG. 2 is a plan view of a boss clutch.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a plan view of the insert.

6 is a sectional view taken along the line VI-VI in FIG.

FIG. 7 is an enlarged view of a joint portion between a boss clutch and an insert.

[Explanation of symbols]

 15 Boss Clutch 30 Insert 30d End Surface of Insert 30

Claims (2)

[Claims] Claim: What is claimed is: 1. In a cast component having an assembling engaging portion with another component, the assembling engaging portion being formed by an insert, the insert being formed by sintering. A casting part having an assembling engagement part, characterized in that a part of the surface of this insert is aligned with the surface of the casting material and exposed. 2. The casting part is a boss clutch used in a multi-plate friction clutch, wherein the inner peripheral surface of the insert is
The cast component having the assembling engagement portion according to claim 1, wherein a concave-convex engagement portion that engages with the output shaft of the other component is formed.