JP2605813B2 - 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: Containing more than 10% to 15%, Mu: 0.1 to 8%, Si: 0.1 to 3.5%, and if necessary, (a) Zn: less than 0.1 to 10%, Sn: 0.1 to 4%, (B) one or more of Fe, Ni, and Co:
0.1 to 6%, (c) one or more of Cr, Ti, V, and Zr: 0.1 to 4%, containing one or more of (a) to (c) And the remainder is made of a Cu-based sintered alloy having a composition of Cu and unavoidable impurities, and a porosity of at least 0.05 to 5% by volume of a sliding surface portion in contact with a partner member. In the synchronous ring made of transmission, in combination with the above composition, porosity existing on the sliding surface portion in contact with the mating member: 0.05 to 5% by volume of pores ensures excellent initial conformability. And a porosity of 0.05 to 5% by volume,
In other words, the high theoretical density ratio of 95 to 99.5% secures the high strength required for the transmission synchronous ring, which reduces the initial adaptability even when used under high surface pressure due to the high output of the transmission. Thus, the occurrence of abnormal wear such as shining surface wear and adhesive wear caused by the above is suppressed, and it has been found that excellent performance is exhibited over a long period of time.

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) Mn and Si These components combine with each other to form an intermetallic compound that is finely dispersed in the substrate, and have an effect of improving strength, wear resistance, conformability, and seizure resistance. There is
If the content is less than 0.1% of Mn and less than 0.1% of Si, a desired effect cannot be obtained in the above-mentioned action.
If the content is more than 8% and the content of Si is more than 3.5%, no further improvement effect appears, and in consideration of economy, the content is set to Mn: 0.1 to 8%, respectively. Si: 0.1-3.
It was set at 5%.

(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% or more, respectively, and Sn:
Even if it exceeds 4%, no further improvement effect is exhibited by the above-mentioned action, so its content is set to Zn: 0.1 to less than 10%, Sn: 0.1 to less than 10%.
４4%.

(D) Fe, Ni, and Co These components combine with Si to form intermetallic compounds that are finely dispersed in the base material, and thus have the effect of improving strength, wear resistance, and seizure resistance. Therefore, if necessary, it is contained. However, if the content is less than 0.1%, a desired improvement effect on the above-mentioned effect cannot be obtained. On the other hand, if the content exceeds 6%, toughness is reduced. Its content was determined to be 0.1-6%.

(E) Cr, Ti, V, and Zr These components form Mn-Si based intermetallic compounds dispersed in the base material into fine spheres, and themselves form a composite compound with Mn and Si. Since it has the effect of improving the toughness and wear resistance, it is contained as necessary,
If the content is less than 0.1%, a desired improvement effect cannot be obtained in the above-mentioned action. On the other hand, if the content exceeds 4%, a further improvement effect does not appear due to the above-mentioned action, and in consideration of economy,
Its content was determined to be 0.1-4%.

(F) Porosity The porosity serves as an oil reservoir in practical use. Even if a sliding surface in contact with a mating member receives a high surface pressure, the initial porosity is prevented from lowering, but rather is improved, and the temperature is further 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% by volume, the 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 used practically. %.

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 a raw material powder, Al powder, Mn powder, Si powder, Zn powder, Sn powder, Ni powder, each having a particle size of 200 mesh or less,
Co powder, Cr powder, prepared Ti powder, V powder and Zr powder, were blended these raw material powders in the formulation compositions shown in the first to third tables and mixed in 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 applying sintering process, Has the same composition as the composition, and the inside diameter is 54 mm x
Thickness: 3 mm transmission synchronous ring made of Cu-based sintered alloy of the present invention (hereinafter referred to as sintered ring of the present invention) having a dimension of 3 mm and 24 chamfers, and comparative transmission ring made of Cu-based sintered alloy 1 to 5 (hereinafter referred to as comparative sintered synchronous rings) were manufactured.

Each of the comparative sintering rings 1 to 5 has the content of any one of the alloy components of the Cu-based sintered alloy constituting the sintering ring or the porosity (* in Tables 3 and 5). 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. 1150r.pm, pressing load: 54kg, oil type: 20W-50, oil temperature: 60 ° C, operation of taper cone: 15,000 times with synchronous time of 0.4 to 0.5 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 Measurements and observations were made, and the results are shown in Tables 4 and 5.

〔The invention's effect〕

From the results shown in Tables 1 to 5, the sintered ring 1 of the present invention was
-33 have the high strength required for a transmission synchronization ring (requires a crushing load of 105 kg or more), and as a result, there is no cracking or deformation. Under the conditions, there was little change in the coefficient of friction in the early and late stages, which indicates that there was no occurrence of cohesive wear, indicating that the initial conformability was excellent, and these results showed a slight decrease. In other words, as shown in Comparative Sintering Rings 1-5, the composition and empty space of the Cu-based sintered alloy constituting this It is evident that any porosity outside the scope of the invention will result in inferior at least one of the above properties. 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

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-174843 (JP, A) JP-B-54-42657 (JP, B2) JP-B-59-34223 (JP, B2)

Claims (8)

(57) [Claims] 1. A Cu-based alloy containing Al: more than 15% to 15%, Mu: 0.1 to 8%, and Si: 0.1 to 3.5%, with the balance being Cu and unavoidable impurities (more than weight%). A transmission synchronous ring made of a Cu-based sintered alloy, which is made of a 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. (2) Al: more than 15% to 15%, Mu: 0.1 to 8%, Si: 0.1 to 3.5%, Zn: 0.1 to less than 10%, Sn: 0.1 to 4%, One or two of the above, and the remainder is made of a Cu-based sintered alloy having a composition of Cu and unavoidable impurities (at least weight%), and at least an empty space at a contact sliding surface portion with a mating member. A transmission synchronous ring made of a Cu-based sintered alloy having a porosity of 0.05 to 5% by volume. 3. Al: more than 15% to 15%, Mu: 0.1 to 8%, Si: 0.1 to 3.5%, and one or more of Fe, Ni, and Co: 0.1-6
%, And the balance is made 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 5 at a contact sliding surface portion with a mating member. A transmission synchronous ring made of a Cu-based sintered alloy characterized by a volume percentage of%. 4. Al: more than 10% to 15%, Mu: 0.1 to 8%, Si: 0.1 to 3.5%, and one or more of Cr, Ti, V and Zr Or more: 0.1 ~
, 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. 5. Al: more than 15% to 15%, Mu: 0.1 to 8%, Si: 0.1 to 3.5%, Zn: 0.1 to less than 10%, Sn: 0.1 to 4%, One or two of them, and one or more of Fe, Ni, and Co: 0.1 to 6
%, And the balance is made 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 5 at a contact sliding surface portion with a mating member. A transmission synchronous ring made of a Cu-based sintered alloy, characterized in that the volume is%. 6. Al: more than 15% to 15%, Mu: 0.1 to 8%, Si: 0.1 to 3.5%, Zn: 0.1 to less than 10%, Sn: 0.1 to 4%, One or two of them, and 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. 7. Al: more than 15% to 15%, Mu: 0.1 to 8%, Si: 0.1 to 3.5%, and one or more of Fe, Ni and Co: 0.1-6
%, 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. 8. Al: more than 10% to 15%, Mu: 0.1 to 8%, Si: 0.1 to 3.5%, Zn: 0.1 to less than 10%, Sn: 0.1 to 4%, One or two of them, and 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.