JP2605814B2 - 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 synchronizing ring having a so-called pin type in which a screw is provided on an outer peripheral side and friction occurs with 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: More than 10% 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
And, if necessary, one or more of Zn: 0.1 to 10%, Sn: 0.1 to 4%, and Mn: 0.1 to 8%. Transmission synchronized with a Cu-based sintered alloy made of a Cu-based sintered alloy having a composition consisting of Cu and unavoidable impurities, and having a porosity of at least 0.05 to 5% by volume at a contact sliding surface portion with a counterpart member In the ring, in combination with the above composition, excellent initial conformability is ensured by porosity of 0.05 to 5% by volume, which is present in the contact sliding surface portion with the mating member, and The high porosity of 0.05 to 5% by volume, in other words, the high theoretical density ratio of 95 to 99.5% ensures the high strength required for the transmission synchronous ring, thereby increasing the surface area due to the high output of the transmission. Suppresses abnormal wear such as bright surface wear and adhesive wear due to reduced initial conformability even when used under pressure Came to be, it was obtained a finding that exhibit superior performance over the long term.

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 its content is 10% or less, it is not possible to secure the desired excellent effect on the above-mentioned effect. Exceeds 15%, the toughness decreases, so the content was determined to be more than 10% to 15%.

(B) Fe, Ni, and Co and Cr, Ti, V, and Zr Fe, Ni, Co, and Cr, Ti, V, Zr are intermetallic compounds that are mutually bonded and finely dispersed in a substrate. Has the effect of improving strength and abrasion resistance. However, if its content is less than 0.1%, desired effects cannot be obtained in the above-mentioned effects, while its content exceeds 6% and 4%, respectively. And, since the amount of the intermetallic compound becomes too large and the machinability decreases, the content of Fe, Ni, Co
It was determined to be 0.1 to 6%, and to be 0.1 to 4% for Cr, Ti, V, and Zr.

(C) Zn and Sn These components have an effect of suppressing cohesive wear and preventing seizure caused thereby, and are contained as necessary. The content of Zn is 0.1% by weight. And Sn: less than 0.1%, a desired improvement effect cannot be obtained in the above-mentioned action, while the content is Zn: 10% and Sn: 4%, respectively.
Since the above effect does not bring about a further improvement effect even if the content exceeds 0.1%, the contents are defined as Zn: 0.1 to 10% and Sn: 0.1 to 4%.

(D) Mn The Mn component has the effect of forming a solid solution in the base material, strengthening it, and also finely spheroidizing the intermetallic compound, thereby improving the strength and wear resistance. However, if the content is less than 0.1%, a desired improvement effect cannot be obtained in the above-mentioned action, and if the content exceeds 8%, no further improvement effect is exhibited, so that the content is 0.1%. ８8%.

(E) Porosity The porosity serves as an oil reservoir in practical use. Even if the sliding surface in contact with the mating member is subjected to a high surface pressure, the initial conformability is prevented from lowering, but rather 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, Zn powder, prepared Sn powder and Mn powder, were blended these raw material powders in the formulation compositions shown in the Tables 1 and 2 respectively, were mixed under normal conditions, 4 ton / cm ² The green compact is press-molded at a pressure of (A), and then (A) temporarily sintered in a hydrogen atmosphere at a predetermined temperature in the range of 450 to 700 ° C. Hot forging at a predetermined temperature (hereinafter referred to as condition A); (B) sintering in a hydrogen atmosphere at a predetermined temperature in the range of 650 to 900 ° C, and then hot sintering at a predetermined temperature in the range of 550 to 850 ° C. Forging (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 under any one of the above conditions A to C By performing the sintering process, it has the same component composition as the compounded composition, and has dimensions of 54 mm inside diameter × 3.5 mm thickness and 24 chamfers. A transmission synchronous ring made of a Cu-based sintered alloy of the present invention (hereinafter referred to as the sintered ring of the present invention) 1 to 16 and a transmission synchronous ring made of a comparative Cu-based sintered alloy (hereinafter referred to as a comparative sintered ring) 1 to 6 having Each was manufactured.

In addition, each of the comparative sintered rings 1 to 6 has the content of any one of the alloy components of the Cu-based sintered alloy constituting the same or the porosity (* in Tables 2 and 3). Are out of the scope of the present invention.

Then, the porosity and the crushing load (using a sample obtained by dividing the ring into three parts and applying a load with an Amsler tester) were measured for the various sintered rings described above. 1000r.pm, pressing load: 60kg, oil type: 75W mission oil, oil temperature: 80 ° C, operation of taper cone: 15,000 times with 0.4 to 0.5 synchronization time The amount of dip (abrasion) on the sliding surface in contact with the taper cone, the presence of cohesive wear, the initial (up to 500 times) and late (the stable period after 500 times) friction coefficients, and the presence or absence of ring cracking and deformation Each was measured and observed, and the results are shown in Table 3.

〔The invention's effect〕

From the results shown in Tables 1 to 3, the sintered ring 1 of the present invention was obtained.
Nos. 16 to 16 all have the high strength required for a transmission synchronization ring (a crushing load of 110 kg or more is required), and as a result, there is no occurrence of cracks or deformation. Under the conditions, there was little change in the coefficient of friction in the initial stage and the late stage, which indicates that the initial conformability was excellent, together with the absence of the occurrence of adhesive wear, and these results showed a slight drop. In other words, as shown in Comparative Sintering Rings 1 to 6, the composition and empty space of the Cu-based sintered alloy constituting the same are shown in the comparative sintering rings 1 to 6. It is clear that any porosity outside the scope of the invention will result in at least one of the above properties being inferior. It is needless to say that a similar result can be obtained with a pin-type transmission synchronization ring.

As described above, the transmission ring made of a Cu-based sintered alloy according to the present invention has high strength, and has 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 (4)

(57) [Claims] 1. Al: more than 10% 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
, And the remainder is composed of a Cu-based sintered alloy having a composition (more than weight%) consisting of Cu and unavoidable impurities, and has a porosity of at least 0.05 to at least a sliding surface in contact with a mating member. A transmission synchronous ring made of a Cu-based sintered alloy, characterized in that the volume is 5% by volume. 2. Al: more than 10% 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%, and one or two of Zn: 0.1 to 10% and Sn: 0.1 to 4%, with the balance being Cu and inevitable impurities (more than weight%). A synchronous ring made of a Cu-based sintered alloy, which is made of a Cu-based sintered alloy and has a porosity of at least 0.05 to 5% by volume at a contact sliding surface portion with a counterpart member. 3. Al: more than 10% 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%, and further, Mn: 0.1 to 8%, and the remainder is composed of a Cu-based sintered alloy having a composition (more than weight%) consisting of Cu and unavoidable impurities, and at least A transmission synchronous ring made of a Cu-based sintered alloy, wherein a porosity of a contact sliding surface portion is set to 0.05 to 5% by volume. 4. Al: more than 10% 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%, and further contains one or two of Zn: 0.1 to 10% and Sn: 0.1 to 4%, and Mn: 0.1 to 8%, with the balance being Cu and unavoidable impurities. Characterized by having a porosity of at least 0.05 to 5% by volume in a sliding surface portion in contact with a mating member, the sintering being made of a Cu-based sintered alloy having a composition of at least Gearbox synchronization ring made of coupling gold.