JPH02107730A - Synchronous ring for transmission made of cu-series sintered alloy - Google Patents

Abstract

PURPOSE:To improve the initial conformability of the title ring and to suppress the generation of its abnormal wear by specifying the content of Sn, Mn, Si and P in a Cu-series sintered alloy and specifying the porosity in the part of the contacting and sliding surface with mating members. CONSTITUTION:A synchronous ring is formed with a Cu-series sintered alloy contg., by weight, 3 to 10% Sn, 1 to 10% Mn, 0.3 to 5% Si and 0.03 to 1% P, furthermore contg., at need, one or both of 0.5 to 9.5% Zn and 0.2 to 5% Al and/or 0.1 to 6% of one or more kinds among Fe, Ni, and Co and/or 0.1 to 4% of one or more kinds among Mo, Cr, Nb, Ti and V and the balance Cu. The porosity at least in the part of the contacting and sliding surface with mating members is regulated to 0.1 to 10vol.%. The synchronous ring has high strength to be required, furthermore has less change in the initial and late friction coefficient even under the condition of high bearing pressure and shows excellent wear resistance.

Description

Detailed Description of the Invention [Industrial FI Group 1 Field] This invention is directed to a carbon fiber which has high strength, excellent initial conformability of the contact sliding surface with a mating member, and also has excellent wear resistance.
This invention relates to a synchronizing ring for a transmission made of a U-based sintered alloy.

[Prior Art] Conventionally, in general, a synchronizing ring for a transmission has an inner surface 1 that contacts a rotating tapered cone and a dynamic surface, and this contact sliding motion as illustrated in a perspective view in FIG. The tapered cone, which is a mating member, makes intermittent surface contact with the surface under high surface pressure.
A key lR3 that fits with a key is formed on the one-sided peripheral surface,
Furthermore, since the chamfers 2 provided at predetermined intervals along the outer edge have the function of engaging with the chamfers of the hub sleeve, which is also a mating member, they are required to have strength, wear resistance, and compatibility with the mating member. Therefore, high-strength brass with these characteristics is often used in its manufacture. In addition, there is also a so-called pin type synchronizing ring, in which a thread is attached to the outer circumferential side and rubs against a taper cone, which is a tU hand part system, on the outer circumferential side.

[Problem to be solved by the invention]

However, with the increase in the output of transmissions in recent years, in the conventional high-strength brass synchronizing ring described above, the contact 11 of at least one of the above-mentioned taper cones, keys, and chamfers of the hub sleeve. Since the moving surface is subjected to high surface pressure, the initial conformability decreases, which leads to frequent abnormal thickness ratios due to bright surface wear and adhesive wear, which causes a shortened service life. There is.

[Means to solve the problem]

Therefore, the present inventors conducted research to solve the problems of the conventional synchronizing ring for transmissions made of high-strength brass as described above, and found that Sn : 3-10%. Mn: I ~1
0%, Si: 0.3-5%, P: 0.0
3-1%.

(a) Zn: 0.5 to 9.5%. AΩ:
One or two of 0.2-5%゜, (b) One or two or more of Fe, Ni, and Co: 0.1-6%, (e) Mo, Cr, Nb , Ti, and one of v
Species or two or more species = 0.1 to 4%, or more (a) to (C)
It is composed of a Cu-based sintered alloy having a composition in which one or more of them is gold-plated and the rest is Cu and unavoidable impurities, and the porosity of at least the contact sliding surface portion with the mating member is In the synchronous ring for a transmission made of a Cu-based sintered alloy with a content of 0.1 to 10% by volume, the porosity present in the contact sliding surface portion with the mating member, including the above composition, is equal to Excellent initial conformability is ensured by the porosity of 0.1 to 10% by volume, and synchronization is achieved by the porosity of 0.1 to 10% by volume, or in other words, a high theoretical density ratio of 90 to 9%. The high strength required for the ring is ensured, and this allows it to be used under high surface pressure due to the high output of transmissions.
They found that the occurrence of abnormal wear such as bright surface wear and adhesive wear due to a decrease in initial conformability is now suppressed, and that the material exhibits excellent performance over a long period of time.

This invention has been made based on the above findings, and the reason why the component composition and porosity are limited as described above will be explained below.

(a) The 5n Sn component is a component that determines the base structure of the alloy,
It has the effect of strengthening the base material, ensuring the strength necessary for the synchronization ring, and further suppressing wear due to adhesion with the mating member, but if its content is less than 3%, the desired effect cannot be obtained. On the other hand, if its content exceeds 10%, not only the strength tends to decrease, but also the toughness and hot workability are impaired. It was set at ~10%.

(b) Mn and Si These components combine with each other to form intermetallic compounds that are finely dispersed in the base material, and have the effect of improving strength, abrasion resistance, conformability, and seizure resistance. However, even if the content is less than 1% for Mn or less than 0.3% for SI, the desired effect cannot be obtained. In some cases, even if the content exceeds 5%, no further improvement effect will be obtained, and in consideration of economic efficiency, the content should be reduced to 1 to 10%, respectively.
, Si: 0.3 to 5%.

(e) The PP component not only dissolves in the base material to strengthen it, but also forms a fine and hard Cu 3P compound that is dispersed in the base material to improve hardness and thereby improve wear resistance. However, if the content is less than 0.03%, the desired effect will not be obtained, while if the content exceeds 1%, the strength and toughness will decrease. from,
Its content was determined to be 0.03 to 1%.

(d) Zn and A, 77 These components not only have the effect of improving the wear resistance of the base material, but also have the effect of particularly suppressing adhesive wear and preventing the seizing caused by this, so they are necessary. However, the content is less than 0.5% Zn, and AN
: If it is less than 0.2%, the desired effect of improving the above action cannot be obtained; on the other hand, even if it exceeds 1:5%, the desired effect of improving the above action cannot be obtained. does not appear, so its content is determined by Z n:0.
5 to 9.5%, Aρ: 0.2 to 5%.

(e) Fe, N+, and C.

These components not only solidly dissolve in the base material and strengthen it, but also combine with Sj, and if they contain Mo, CrNb, Ti, and V, also combine with these components.
It forms intermetallic compounds that are finely dispersed in the substrate, which has the effect of improving strength, wear resistance, and seizure resistance.
If the content is less than 1%, the desired effect of improving the above action cannot be obtained, while if the content exceeds 6%, the toughness will decrease, so the content m was determined to be 0.1 to 6%.

(r) Mo, Cr, Nb, Ti, and V These components include Mn-3i intermetallic compounds dispersed in the substrate into fine spherules, and Mn and Si themselves, as well as Fe, Nl, and When Co is mixed with gold, these components are added to form a composite compound, which has the effect of improving strength, toughness, and wear resistance, so it is included as necessary. If the content is less than 0.1%, the desired effect of improving the above-mentioned action cannot be obtained, and on the other hand, even if the content exceeds 4%, the effect of further improving the above-mentioned action does not appear. , its content was determined to be 0.1 to 4%.

In addition, unavoidable impurities such as Mg and Ca, as well as PB and oxygen may be contained, but if the total amount of these unavoidable impurities is 1.5% or less, they will not affect the characteristics in any way. Therefore, its content is permissible as long as the content does not exceed 15%.

(g) Porosity During practical use, pores become oil pockets, and even if the contact sliding surface with the mating member is subjected to high surface pressure, it prevents low initial staining properties.
Rather, it has the effect of improving this, further suppressing temperature rise, thereby preventing the occurrence of bright surface wear and adhesive wear, and improving wear resistance.In addition, the presence of a thin oxide film formed on the pore surface has the effect of normalizing wear, but if the proportion is less than 0.18%, the desired effect will not be obtained, while if the proportion exceeds 10% by volume, the strength will decrease, making it impractical for practical use. Therefore, the ratio was set at 0.1 to 10% by volume.

It should be noted that the porosity of 0.1 to 10% by volume cannot be obtained by normal sintering;
It is obtained by subjecting a sintered body or temporary sintered body having a porosity of % by volume to hot working such as hot forging or hot rolling.

〔Example〕

Next, the synchronization ring of the present invention will be specifically explained using examples.

Raw material powders include Cu powder, Si powder, Mn powder, Si powder, and Cu powder, all of which have a particle size of 200 mcsh or less.
-P alloy (P: 20% white) powder, Zn powder, A
Ω powder, Fe powder, Ni powder, Cu powder, Mo powder, C
Prepare r powder, Nb powder, Ti powder, and ■ powder,
These raw material powders were blended into the compositions shown in Table 1, mixed under normal conditions, and then press-molded into a green compact at a pressure of 4 Lon/cd. Temporary sintering in an atmosphere at a predetermined temperature in the range of 400 to 650°C, followed by hot forging at a predetermined temperature in the range of 500 to 800°C (hereinafter referred to as A condition), (13)
After sintering at a predetermined temperature within the range of 600 to 850 °C in a hydrogen atmosphere, hot forging at a predetermined temperature within the range of 500 to 800 °C (hereinafter referred to as B condition), (C) 600 °C in a hydrogen atmosphere. By sintering at a predetermined temperature within the range of ~850°C (hereinafter referred to as C condition), by performing sintering processing under any of the above conditions A-C, the composition is substantially the same as the compound composition. A synchronous ring for a transmission made of a Cu-based sintered alloy of the present invention (hereinafter referred to as the sintered synchronous ring of the present invention) having a component composition of H, an inner diameter of 48 mm x a thickness of 2.9 mm, and a chamfer number of 24. Synchronous rings 1 to 38 and Comparative Cu-based sintered alloy transmission synchronizing rings (hereinafter referred to as comparative sintered synchronizing rings) 1 to 7 were manufactured, respectively.

In addition, comparative sintered synchronous rings 1 to 7 all differ in the content of any one of the constituent components or in the porosity (first
Tables marked with * in Table and Table 2) are outside the scope of this invention.

Then, the porosity and crushing load were measured for the various sintered synchronous rings mentioned above, and the rotation speed of the tapered cone as the mating member + 1400 r, p, a + s pressing load: 60 kg.

1It1 type Near No. 0 gear oil, Ura Temperature: 80℃, Taper cone operation: 4 with synchronized time of 0.2 to 0.4
A synchro durability test was performed under the conditions of 0.000 times, and the amount of depression (amount of wear) on the sliding surface in contact with the tapered cone, which is the mating member, the presence or absence of adhesive wear, the initial period (up to 500 times) and the late period (up to 500 times). The coefficient of friction during the stable period after the test was measured and observed, and the presence or absence of cracks and deformation of the ring were measured and observed, and the results are shown in Table 2.

〔Effect of the invention〕

From the results shown in Tables 1 and 2, the sintered synchronous rings 1 to 38 of the present invention all have the high strength required for synchronous rings (a crushing load of 110 kg or more is required). As a result, there is no cracking or deformation, and even under high surface pressure there is little change in the coefficient of friction in the initial and late stages, which includes the fact that there is no adhesive wear. These results show that the initial conformability is excellent, and these results show only a small amount of depression, that is, excellent wear resistance.In contrast, the comparative sintered synchronous rings 1 to As seen in No. 7, it is clear that if either the component composition or the porosity falls outside the scope of the present invention, at least one of the above properties will become inferior. It goes without saying that similar results can be obtained with a bin-type synchronization ring.

As mentioned above, the synchronizing ring for a transmission made of a Cu-based sintered alloy of the present invention has high strength and exhibits excellent conformability, especially in practical use under conditions of high blood pressure associated with the increase in the output of the transmission. Therefore, since the occurrence of abnormal wear such as bright surface wear and adhesive wear is eliminated, it exhibits excellent wear resistance and exhibits excellent performance over an extremely long period of time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating a synchronizing ring for a transmission. 1... Contact sliding surface (inner surface) with tapered cone 2...
・Chamfa 3...Ganto Keizoyama Mitsubishi Metals Corporation agent Kazuo Todorota and 1 other person

Claims (8)

[Claims] (1) Sn: 3-10%, Mn: 1-10%, Si: 0
．． Contains 3-5%, P: 0.03-1%, and the rest is C.
It is composed of a Cu-based sintered alloy having a composition (more than % by weight) consisting of u and unavoidable impurities, and the porosity of at least the contact sliding surface portion with the mating member is 0.1 to 10% by volume. A synchronizing ring for transmissions made of a characteristic Cu-based sintered alloy. (2) Sn: 3-10%, Mn: 1-10%, Si: 0
．． 3 to 5%, P: 0.03 to 1%, and further contains one or two of Zn: 0.5 to 9.5%, Al: 0.2 to 5%. The sintered alloy is made of a Cu-based sintered alloy having a composition (by weight %) with the remainder consisting of Cu and unavoidable impurities, and the porosity of at least the sliding surface portion in contact with the mating member is 0.1.
A synchronizing ring for a transmission made of a Cu-based sintered alloy, characterized in that the content is ~10% by volume. (3) Sn: 3-10%, Mn: 1-10%, Si: 0
．． 3 to 5%, P: 0.03 to 1%, and further contains one or more of Fe, Ni, and Co:
0.1 to 6%, and the remainder is Cu and unavoidable impurities (wt%), and has pores at least in the contact sliding surface portion with the mating member. rate to 0.1
A synchronizing ring for a transmission made of a Cu-based sintered alloy, characterized in that the content is ~10% by volume. (4) Sn: 3-10%, Mn: 1-10%, Si: 0
．． 3 to 5%, P: 0.03 to 1%, and further contains one or more of Mo, Cr, Nb, Ti, and V: 0.1 to 4%. , the remainder is Cu-based sintered alloy with a composition (more than % by weight) consisting of Cu and unavoidable impurities, and the porosity of at least the contact sliding surface portion with the mating member is 0.1.
A synchronizing ring for a transmission made of a Cu-based sintered alloy, characterized in that the content is ~10% by volume. (5) Sn: 3-10%, Mn: 1-10%, Si: 0
．． 3 to 5%, P: 0.03 to 1%, and further one or two of Zn: 0.5 to 9.5%, Al: 0.2 to 5%, One or more of Fe, Ni, and Co:
0.1 to 6%, and the remainder is Cu and unavoidable impurities (wt%), and has pores at least in the contact sliding surface portion with the mating member. rate to 0.1
A synchronizing ring for a transmission made of a Cu-based sintered alloy, characterized in that the content is ~10% by volume. (6) Sn: 3-10%, Mn: 1-10%, Si: 0
．． 3 to 5%, P: 0.03 to 1%, and further one or two of Zn: 0.5 to 9.5%, Al: 0.2 to 5%, One or more of Mo, Cr, Nb, Ti, and V: 0.1 to 4%, and the remainder is Cu and unavoidable impurities (weight %). The porosity of at least the contact sliding surface portion with the mating member is 0.1.
A synchronizing ring for a transmission made of a Cu-based sintered alloy, characterized in that the content is ~10% by volume. (7) Sn: 3-10%, Mn: 1-10%, Si: 0
．． 3 to 5%, P: 0.03 to 1%, and further contains one or more of Fc, Ni, and Co:
0.1 to 6%, and one or more of Mo, Cr, Nb, Ti, and V: 0.1 to 4%, with the remainder consisting of Cu and unavoidable impurities (or more). % by weight), and the porosity of at least the contact sliding surface portion with the mating member is 0.1.
A synchronizing ring for a transmission made of a Cu-based sintered alloy, characterized in that the content is ~10% by volume. (8) Sn: 3-10%, Mn: 1-10%, Si: 0
．． 3 to 5%, P: 0.03 to 1%, and further one or two of Zn: 0.5 to 9.5%, Al: 0.2 to 5%, One or more of Fe, Ni, and Co:
0.1 to 6%, and one or more of Mo, Cr, Nb, Ti, and V: 0.1 to 4%, with the remainder consisting of Cu and unavoidable impurities (or more). % by weight), and the porosity of at least the contact sliding surface portion with the mating member is 0.1.
A synchronizing ring for a transmission made of a Cu-based sintered alloy, characterized in that the content is ~10% by volume.