JP2605815B2 - Transmission synchronous ring made of Cu-based sintered alloy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention has high strength, excellent initial conformability of a sliding surface in contact with a mating member, and also excellent wear resistance.
The present invention relates to a transmission synchronous ring made of a Cu-based sintered alloy.

[Conventional technology]

Conventionally, in general, a transmission synchronization ring generally has a sliding surface in contact with a rotating taper cone as shown in a perspective view of FIG. 1, and a taper cone as a mating member is formed on the contact sliding surface. A key groove 3 into which a key is fitted is formed on the outer peripheral surface, and chamfers 2 provided at predetermined intervals along the outer edge thereof are formed on the outer peripheral surface of the hub sleeve. Because it has the function of engaging with the chamfer, it is required to have strength, abrasion resistance, and conformability with a mating member, and therefore, in its manufacture, high-strength brass having these characteristics is frequently used. . In addition, there is another type of transmission synchronization ring, commonly called a pin type, in which a screw is provided on an outer peripheral side and friction is applied to a tapered cone as a mating member on the outer peripheral side.

[Problems to be solved by the invention]

However, with the recent increase in the output of the transmission, in the above-mentioned conventional high-strength brass transmission synchronous ring, in particular, the above-mentioned taper cone and key, and at least one of the mating members of the hub sleeve chamfer. Since the contact sliding surface is subjected to high surface pressure, the initial conformability is reduced, which causes abnormal wear such as bright surface wear and adhesive wear to occur frequently, leading to a shortened service life. ing.

[Means for solving the problem]

Therefore, the present inventors have conducted research to solve the problems of the conventional high-strength brass transmission synchronization ring as described above, and as a result, in weight% (hereinafter,% indicates weight%), Al: 8.5 to 15%, one or more of Fe, Ni, and Co: 0.1 to 6
%, One or more of Cr, Ti, V, and Zr: 0.1 to
4%, Si: 0.1 to 3.5%, Zn: 0.1 to 10%, Sn: 0.1 to 4%, one or two of the following, with the balance being Cu and unavoidable impurities In a transmission synchronous ring made of a Cu-based sintered alloy made of a Cu-based sintered alloy having a porosity of at least 0.05 to 5% by volume and having a porosity of at least 0.05 to 5% by volume in contact with a mating member, In combination with the above composition, the porosity present in the contact sliding surface portion with the mating member: 0.05 to 5% by volume of pores ensures initial conformability, and the above described 0.05 to 5% by volume. The high porosity, in other words, the high theoretical density ratio of 95 to 99.5% ensures the high strength required for the transmission synchronous ring. This allows the transmission to be used under high surface pressure due to the high output of the transmission. The occurrence of abnormal wear such as bright surface wear and adhesive wear due to reduced conformability is suppressed, It was obtained a finding that exhibit superior performance I.

The present invention has been made based on the above findings, and the reason why the component composition and the porosity of the Cu-based sintered alloy constituting the transmission synchronization ring are limited as described above will be described below.

(A) Al The Al component is a component that determines the base structure of the alloy,
In addition to improving the abrasion resistance of the base material, it also provides the necessary strength to the synchronous ring, and furthermore, adhesion wear caused by plastic flow caused by local high-temperature heating (as described above, one type of abnormal wear)
Has the effect of suppressing the occurrence of oil and improving the initial conformability in an oil sump. However, if the content is less than 8.5%, the desired effect cannot be secured in the above-mentioned action, while the content is 15%. %, The toughness is reduced, so the content is set to 8.5% to 15%.

(B) Fe, Ni, and Co and Cr, Ti, V, and Zr and Si Fe, Ni, Co, and Cr, Ti, V, Zr and Si are mutually bonded,
It forms an intermetallic compound that is finely dispersed in the substrate and has the effect of improving strength and abrasion resistance. However, if its content is less than 0.1%, the desired effect cannot be obtained in the above-mentioned effects. Exceeds 6%, 4% and 3.5%, respectively, the amount of the intermetallic compound becomes too large and the machinability deteriorates.
0.1 to 6% for Co, and for Cr, Ti, V, and Zr
0.1-4%, and about 0.1-3.5% for Si.

(C) Zn and Sn These components have an effect of suppressing, in particular, adhesive wear and preventing seizure caused by this, but if the content is less than 0.1% Zn: and less than 0.1% Sn: The desired improvement effect cannot be obtained in the above action, while the content thereof is
Even if Zn exceeds 10% and Sn exceeds 4%, a further improvement effect does not appear due to the above action.
0.1-10%, Sn: 0.1-4%.

(D) Porosity The porosity serves as an oil reservoir in practical use. Even if the sliding surface in contact with the mating member receives a high surface pressure, the initial bleeding property is prevented from lowering, and the porosity is improved. Restrain the rise,
This has the effect of preventing the occurrence of bright surface wear and adhesion wear and improving wear resistance, and also has the effect of normalizing wear due to the presence of a thin oxide film formed on the pore surface. If the content is less than 0.05 to 5% by volume, a desired effect cannot be obtained in the above-mentioned action. On the other hand, if the content exceeds 5% by volume, the strength is reduced and the material cannot be put to practical use.
The ratio was determined to be 0.05 to 5% by volume.

The above porosity of 0.05 to 5% by volume cannot be obtained by ordinary sintering, but is about 10% by volume obtained by ordinary sintering.
Is obtained by performing hot working such as hot forging or hot rolling on a sintered body or a pre-sintered body having a porosity of?

〔Example〕

Next, the transmission synchronizing ring of the present invention will be specifically described with reference to embodiments.

As the raw material powder, Al powder, Fe powder, Ni powder, Co powder, Cr powder, Ti powder, each having a particle size of 200 mesh or less,
V powder, Zr powder, Si powder, prepared Zn powder and Sn powder, and blending these starting material powders in the blending composition shown in Table 1 and mixed in a normal condition, the pressure of 4 ton / cm ² Press molding into a green compact, and then, (A) temporarily sintering in a hydrogen atmosphere at a predetermined temperature in a range of 450 to 700 ° C., and then a predetermined temperature in a range of 550 to 850 ° C. (B) Sintering in a hydrogen atmosphere at a predetermined temperature in the range of 650 to 900 ° C., followed by hot forging at a predetermined temperature in the range of 550 to 850 ° C. (Hereinafter, referred to as condition B), (C) sintering in a hydrogen atmosphere at a predetermined temperature in the range of 650 to 900 ° C. (hereinafter, referred to as condition C), and sintering under any of the above conditions A to C By performing the processing, it has the same component composition as the compounding composition, and the inner diameter: 50 mm × thickness: 3 mm and the number of 24 chamfers Transmission ring made of a Cu-based sintered alloy of the present invention (hereinafter referred to as the present invention sintered ring) having
Transmission synchronous rings (hereinafter referred to as comparative sintered rings) 1 to 5 made of a Cu-based sintered alloy were manufactured, respectively.

Next, the porosity and the crushing load (using a sample obtained by dividing the ring into three parts and applying a load with an Amsler testing machine) were measured for the various sintered rings described above. ) Rotation speed: 1050r.pm, pressing load: 62kg, oil type: 75W mission oil, oil temperature: 75 ° C, operation of taper cone: 15,000 times with 0.6-0.7 synchronization time, A synchro durability test was conducted under the conditions described above, and the amount of dip (abrasion) on the sliding surface in contact with the tapered cone as the mating member, the presence or absence of adhesive wear, the initial stage (up to 500 times) and the latter stage (the stable period after 500 times) ) Were measured and observed, respectively, and the results were shown in Table 2.

〔The invention's effect〕

From the results shown in Tables 1 and 2, all of the sintered synchronous rings 1 to 7 of the present invention have the high strength required for transmission synchronous rings (110 kg or more in crushing load). As a result, there was no cracking or deformation, and even under high surface pressure conditions, the friction coefficient in the initial and late stages did not change much.This, coupled with the absence of adhesive wear, The results show that the initial conformability is excellent, and these results show only a small amount of depression, that is, excellent wear resistance, whereas the comparative sintered rings 1 to 5 show As described above, when the Al content and the porosity of the Cu-based sintered alloy constituting the same are out of the range of the present invention, or when the Cu-based sintered alloy is a Cu-12% Al sintered alloy, At least one of the properties is inferior Rukoto is clear.
It is needless to say that a similar result can be obtained with a pin-type transmission synchronization ring.

As described above, the transmission synchronous ring made of a Cu-based sintered alloy of the present invention has high strength, and exhibits excellent conformability even in practical use under high surface pressure application conditions accompanied by high output of the transmission. Therefore, the occurrence of abnormal wear such as bright surface wear and adhesion wear is eliminated, so that excellent wear resistance is exhibited, and excellent performance is remarkably exhibited for a long period of time.

[Brief description of the drawings]

 FIG. 1 is a perspective view illustrating a transmission synchronization ring. 1 ... contact sliding surface (inner surface) with taper cone 2 ... chamfer 3 ... keyway

Claims (1)

(57) [Claims] 1. Al: 8.5 to 15%, one or more of Fe, Ni and Co: 0.1 to 6
%, One or more of Cr, Ti, V, and Zr: 0.1 to
4%, Si: 0.1 to 3.5%, Zn: 0.1 to 10%, Sn: 0.1 to 4%, one or two of the following, and the remainder is from Cu and inevitable impurities. Characterized by having a porosity of at least 0.05 to 5% by volume in a contact sliding surface portion with a mating member, the sintering being made of a Cu-based sintered alloy having a composition (at least weight%). Gold transmission synchronization ring.