JPH06129447A - Synchronizer ring - Google Patents

Abstract

PURPOSE:To secure a synchronizer ring that uses an inexpensive wear resistant material which is powerfully joined in a sliding part by a simple thermal spraying means, and is formed with a stable joining strength film in addition to being high in wear resistance. CONSTITUTION:A wear resistant brass material is thermally sprayed direct on the surface of a sliding part and thereby a wear resistant film 5 is formed there, and the wear resistant brass material makes Cu, Zn into an essential ingredient, thereby constituting a synchronizer ring 1 consisting of an alloy containing Al, Mn, Fe, Ni, Si, Co, Cr, Ti, Nb, V and at least one type of the other metal elements. In addition, such a case that an amount of 1 to 50% of Mo is added to the wear resistant brass material may be done often.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronizer ring particularly suitable for use in a transmission of a vehicle which requires high torque.

[0002]

2. Description of the Related Art Synchronizer rings are generally manufactured from wear-resistant copper alloy alone. However, in transmissions of vehicles that require high horsepower and high torque, such as large vehicles and sports cars, in order to endure high loads, the sliding parts of the synchronizer ring are provided with high wear resistance. Build the synchronizer ring body with the material of the system,
Means have been taken to form a wear resistant film on the surface of the sliding portion. The following method is used as the means.

1. Mo, which is known to have high wear resistance, is sprayed onto the sliding portion. 2. A mixture of a wear resistant aluminum alloy and Mo is sprayed on the sliding portion. 3. A wear resistant material is mechanically or welded to the sliding portion.

[0004]

Among the methods described above, the method of spraying Mo is currently widely used in large vehicles and the like, but the material price of Mo used is extremely high (the material cost is less than that of the present invention. However, the cost of the product is unavoidably high.

When spraying a mixture of a wear-resistant aluminum alloy and Mo, it is currently used in a part of a synchronizer ring, but Si contained in the wear-resistant aluminum alloy is used.
However, since it impairs the wettability with the base material during thermal spraying, the joint strength of the thermal spray coating is low, and its application is limited, for example, except for large vehicles.

When the wear-resistant material is mechanically or welded to each other, the wear-resistant material is formed into a ring-like sliding surface side, which is fitted into the synchronizer ring body and crimped with a pin, Or shrink fit for integration,
Manufacturing was very difficult due to the complex combination of cooling fit and electron beam welding. Further, the number of parts is increased and the number of assembling steps is also increased, which is disadvantageous in terms of cost.

In view of the above situation, the present invention uses an inexpensive wear-resistant material, which is strongly bonded to the sliding portion by a simple thermal spraying means, has high wear resistance and is stable. The purpose of the present invention is to provide a synchronizer ring having a bond strength film.

[0008]

In order to achieve the above object, the present invention forms a wear resistant coating by directly spraying a wear resistant brass material on the surface of a sliding portion, Abrasive brass material contains Cu and Zn as essential components.
1, Mn, Fe, Ni, Si, Co, Cr, Ti, N
A synchronizer ring characterized by being an alloy containing at least one of b, V and other metal elements was constructed.

Further, 1 to 5 Mo is added to the wear resistant brass material.
Sometimes 0% is added. In this specification,% is shown by weight.

[0010]

In the above wear-resistant brass material, the metallographic structure is composed of a matrix and a harder intermetallic compound, and the structure of the matrix is α + β phase, β phase, or β phase.
+ Γ phase. The hardness of the intermetallic compound is 300 or more in terms of micro Vickers hardness. Therefore, when this is directly sprayed on the sliding portion, it becomes a wear resistant coating having a very high hardness. Note that the direct thermal spraying refers to a normal thermal spraying method such as an oxygen mixed fuel gas type supersonic thermal spraying method, a metallizing thermal spraying method, a plasma thermal spraying method.

Further, since the thermal spraying material does not necessarily contain Si and a small amount is sufficient even if it is contained, the wettability with the synchronizer ring material is not impaired and a stable bonding strength of the wear resistant coating is obtained. To be

When Mo is added, the wear resistance and the joint strength are further improved. However, if the addition amount is less than 1%, the effect cannot be expected, and the addition amount is 50%.
When it exceeds, it is not possible to expect further improvement of the effect.

[0013]

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

An embodiment will be described with reference to FIGS. 1 and 2. A synchronizer ring R shown in the figure is an inner diameter sliding dip that slides on a gear cone at an inner diameter, and has an inner peripheral surface ( Abrasion resistant film 5 on inner diameter 66 mm)
Is formed. The synchronizer ring main body 1 is manufactured by using JIS G4105 SCM435H as a material, and performing hot forging (forging temperature 1000 ° C.), heat treatment (carburizing and quenching), and machining (lathe machining → machining → polishing). The wear resistant coating 5 is formed by thermal spraying of a wear resistant brass material.

Table 1 exemplifies the composition of the wear resistant brass material according to the present invention. Then, based on the materials of ,, and in Table 1, a product of the present invention and a comparative example product were prepared, and the synchronizer ring R was subjected to a wear resistance test and a joint strength test. Table 2 shows the conditions of the abrasion resistance test. Tables 3 and 4 show the products of Examples and Comparative Examples and the results of the tests. The thickness of the wear-resistant coating 5 was 100 μm, and for the joint strength test, the tensile test of the joint portion was performed according to ASTM C633.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

Next, the examples will be evaluated based on the above test results.

1) In comparison with the case of a single body, if the same material is used, thermal spraying has better wear resistance (Table 3).
NO. 1 and NO.13, NO.4 and NO.14).

2) Conventional Mo spraying (NO. 11 in Table 3, Table 4)
No. 13) of No. 13), and 15% Si / Al alloy + 50% Mo thermal spraying (NO. 12 of Table 3, NO. 14 of Table 4), the bonding strength and wear resistance of the thermal spray coating are Is better.

3) The thermal spray material added with Mo (1 to 50%) has both improved wear resistance and bonding strength. However, even if it exceeds 50%, the effect is not so great.

4) The wear resistance of the sprayed synchronizer ring largely depends on the material to be sprayed.

5) Addition of Mo improves the wear resistance of a thermal spray material (for example) which is relatively inferior in wear resistance.

3 and 4 show another example of the form of the synchronizer ring R. In this case, the synchronizer ring R is an outer diameter sliding type which slides on the cone sleeve at the outer diameter, and The abrasion resistant film 5 is formed on the outer peripheral surface as the sliding portion of the nizer ring body 1 in the same manner as described above.

[0023]

As described above, the present invention succeeded in providing a synchronizer ring having not only high wear resistance of the wear resistant coating formed on the sliding portion but also stable bonding strength. Since the wear-resistant coating is formed by thermal spraying of a relatively inexpensive wear-resistant brass material, it can withstand a high load in a vehicle transmission requiring high horsepower and high torque. It has an excellent effect that it is suitable for providing an inexpensive synchronizer ring to be obtained.

In particular, 1 to 50 Mo is added to the wear resistant brass material.
%, The wear resistance and the joint strength can be effectively increased.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a synchronizer ring embodying the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view showing another form of the synchronizer ring embodying the present invention.

4 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 R Synchronizer ring 1 Synchronizer ring body 5 Abrasion resistant film

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[Procedure amendment]

[Submission date] November 9, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

In order to achieve the above object, the present invention forms a wear-resistant coating by directly spraying a wear-resistant brass material on the surface of a sliding portion, Abrasive brass material contains Cu and Zn as essential components.
1, Mn, Fe, Ni, Si, Co, Cr, Ti, N
A synchronizer ring characterized by being an alloy containing at least one of b, V and other metal elements was constructed.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Inagaki 1 No. 1 Nishi-Ashihara, Tateyama-machi, Nakashingawa-gun, Toyama Prefecture Chuetsu Alloy Casting Co., Ltd.

Claims (2)

[Claims] 1. A wear-resistant brass material is directly sprayed on the surface of a sliding portion to form a wear-resistant coating film, and the wear-resistant brass material contains Cu and Zn as essential components.
1, Mn, Fe, Ni, Si, Co, Cr, Ti, N
A synchronizer ring containing at least one of b, V, and other metal elements. 2. The synchronizer ring according to claim 1, wherein 1 to 50% by weight of Mo is added to the wear resistant brass material.