JPH0250928A - Synchronous ring for change gear made of cu sintered alloy - Google Patents

Abstract

PURPOSE:To improve the strength, conformability and wear resistance of the title ring by forming it with a sintered alloy contg. specified Al, Mn, Si, Zn, Sn and Cu and regulating the porosity in the contact sliding face part with the mating members to prescribed one. CONSTITUTION:The synchronous ring for a change gear made of a Cu sintered alloy is formed with the compsn. constituted of, by weight, 8.5 to 15% Al, 0.1 to 8% Mn, 0.1 to 8.5% Si and the balance Cu or, in addition to this, furthermore of 0.1 to 10% Zn and/or 0.1 to 4% Sn. The porosity in the contact sliding face part with the mating members is then regulated to 0.05 to 5vol.%. The above ring has high strength, has excellent initial conformability with the mating members in the contact sliding face and furthermore has excellent wear resistance.

Description

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

[Conventional technology]

Conventionally, a synchronizing ring for a transmission generally has an inner surface 1 that serves as a contact sliding surface with a rotating taper cone, and a tapered cone serving as a mating member on this contact sliding surface, as illustrated in a perspective view in FIG. are intermittently in surface contact under high surface pressure, and a key groove 3 into which a key fits is formed on the unilateral circumferential surface, and chamfers 2 provided at predetermined intervals along the outer edge of the key groove 3 are also provided with chamfers 2 at predetermined intervals along the outer edge of the hub. Since it has the function of engaging with the chamfer of the sleeve, it is required to have strength, wear resistance, and compatibility with the mating member, so high-strength brass with these characteristics is often used in its manufacture. ing. In addition, there is also a so-called pin type synchronizing ring, which has a thread on the outer circumferential side and rubs against a tapered cone, which is a mating member, on the outer circumferential side.

[Problem to be solved by the invention]

However, with the increase in the output of transmissions in recent years, the above-mentioned conventional high-strength brass synchronizing ring has been designed to reduce the contact sliding of at least one of the above-mentioned taper cone, key, and chamfer of the hub sleeve. Since the dynamic surface is subjected to high blood pressure, its initial conformability is reduced, which causes frequent abnormal wear such as bright surface wear and adhesive wear, leading to a shortened service life.

[Means to solve the problem]

Therefore, the present inventors conducted research to solve the above-mentioned problems with the conventional synchronizing ring for transmissions made of brass, and found that Aρ :8.5~15%, Mn: 0.1~8
%.

St: 0.1-3.5%.

(a) Zn: 0.1-10%, Sn:
0.1-4%.

(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%.

It is composed of a Cu-based sintered alloy containing one or more of the above (a) to (C), with the remainder consisting of Cu and unavoidable impurities, and has at least a contact sliding surface with a mating member. Synchronous rings for transmissions made of Cu-based sintered alloy with a porosity of 0.05 to 5% by volume in the sliding surface part have the above composition, and the sliding surface part in contact with the mating member has the same composition as above. Porosity present in: 0.05 to 5% by volume of pores ensures excellent initial conformability, and the porosity of 0.05% to 5% by volume ensures excellent initial conformability.
Porosity of 05-5% by volume, in other words 95-99.5
% theoretical density ratio ensures the high strength required for synchronizing rings, which prevents bright surface wear and adhesion due to reduced initial stain resistance even when used under high blood pressure associated with high output of transmissions. They found that the occurrence of abnormal wear such as abrasion is now suppressed, and that the product 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) 11 AΩ component is a component that determines the base structure of the alloy,
In addition to improving the wear resistance of the base material, it gives the synchronous ring the necessary strength (=1), and also reduces adhesive wear caused by plastic flow caused by localized high-temperature heating (1) of abnormal wear as mentioned above.
However, if its content is less than 8.5%, the desired effect cannot be achieved; If the content exceeds 15%, the toughness decreases, so the content was set at 8.5 to 15%.

(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 Mn: 0.1%, Si: 0.1
If the content is less than %, the desired effect cannot be obtained, and on the other hand, the content is 8% for Mn and 3.5% for Si.
Even if the content exceeds M n
: O, 1 to 8%, Si:o, 1 to 3.5%.

(c) Zn and Sn These components have the effect of particularly suppressing adhesive wear and preventing seizure caused by this, so they are included as necessary, but the content is Z n: 0 If the Zn content is less than 0.1% and if the Zn content is less than 0.1%, the desired effect of improving the above action cannot be obtained;
Even if the content exceeds 0% and Sn: 4%, no further improvement effect will appear due to the above action.
: 0.1 to 10%, and Sn: 0.1 to 4%.

(d) Fe, Nj, and C.

These components combine with Sl to form intermetallic compounds that are finely dispersed in the substrate, thereby improving strength, wear resistance, and seizure resistance, so they may be included as necessary. However, if its content is less than 0.1%, the desired effect of improving the above action cannot be obtained;
If the content exceeds L1%, the toughness decreases, so the content was determined to be L1 to 6%.

(g) Cr, Ti, V, and Zr In these components, Mn-3i intermetallic compounds dispersed in the substrate are made into fine spherules, and they themselves form composite compounds with Mn and Si to improve strength. , has the effect of improving toughness and wear resistance, so it is included as necessary, but
If the content is less than 0.1%, the desired effect of improving the above action cannot be obtained, and on the other hand, even if the content exceeds 4%, the effect of further improving the above action does not appear. , its content was determined to be 0.1 to 4%.

Incidentally, unavoidable impurities such as P, Pb1, and Mg may be contained, but these unavoidable impurities do not affect the properties in any way if the content is 1.5% or less. at a rate not exceeding 1.5%,
Its inclusion is permissible.

(f) Porosity Porosity becomes an oil reservoir during practical use, and even if the contact sliding surface with the mating part is subjected to high surface pressure, it prevents the initial conformability from deteriorating,
Rather, it has the effect of improving this, further suppressing temperature rise, thereby preventing the occurrence of bright wear and adhesive wear, and improving wear resistance.In addition, the presence of a thin oxide film formed on the pore surface However, if the proportion is less than 0.05% by volume, the desired effect cannot be obtained, while if the proportion exceeds 5% by volume, the strength decreases and it is not practical. Therefore, the ratio was set at 0.05 to 5% by volume.

Note that the above porosity of 0.05 to 5% by volume cannot be obtained by normal sintering, but is obtained by using a sintered body or calcined body with a porosity of about 10% by volume obtained by normal sintering. It is obtained by subjecting a compact 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.

As raw material powders, AΩ powder, Mn powder, Si powder, Zn powder, and S powder all have a particle size of 200 mesh or less.
n powder, Fe powder, Ni powder, Co powder, Cr powder, T
I powder, ■ powder, and Zr powder were prepared, and these raw material powders were blended into the composition shown in Table 1, mixed under normal conditions, and then press-molded into a green compact at a pressure of 4 ton/cd. Then, this green compact is (A) temporarily sintered in a hydrogen atmosphere at a predetermined temperature in the range of 450 to 700°C, and then hot forged (hereinafter referred to as ), (B)
After sintering at a predetermined temperature in the range of 650 to 900 °C in a hydrogen atmosphere, hot forging at a predetermined temperature in the range of 550 to 850 °C (hereinafter referred to as B condition), (C) 650 °C in a hydrogen atmosphere. By performing sintering at a predetermined temperature within the range of ~900°C (hereinafter referred to as C condition), or performing sintering treatment under any of the conditions A to C above, a material with substantially the same composition as the compound composition can be obtained. Synchronizing rings for transmissions made of Cu-based sintered alloy of the present invention (hereinafter referred to as sintered synchronizing rings of the present invention) 1 to 39 having a component composition, inner diameter: 54 mm x thickness: 3 mm, and a number of chamfers of 24 Comparative Cu-based sintered alloy transmission synchronization rings 1 to 6 (hereinafter referred to as comparative sintered synchronization rings) were manufactured, respectively.

In addition, comparative sintered synchronous rings 1 to 6 all differ in the content of one of the constituent components or the porosity (the first
Tables marked with * in Table and Table 2) are outside the scope of this invention.

Next, regarding the various sintered synchronous rings mentioned above, the porosity,
and the crushing load (load applied using an Amsler tester using a sample divided into three parts of the ring), and further, the number of rotations of the tapered cone, which is the mating member: I] 50 r, p
, m,, Pressing load: 54 kg.

Oil type + 20W -50, oil temperature 60℃, taper cone operation: 1 with synchronization time of 0.4 to 0.5
A synchro durability test was conducted under the conditions of 5,000 times, and the amount of depression (amount of wear) on the sliding surface in contact with the tapered cone, the mating member, the presence or absence of adhesive wear, the initial period (up to 500 times) and the late period (after 500 times). The coefficient of friction during the stable period) and the presence or absence of ring cracking and deformation 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 39 of the present invention all have the high strength required for synchronous rings (a crushing load of 105 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. As can be seen, if both the component composition and the porosity are outside the scope of the present invention, it is clear that at least one of the above properties will be inferior.

It goes without saying that similar results can be obtained with a pin-type synchronous ring.

As mentioned above, the synchronizing ring for a transmission made of a Cu-based sintered alloy according to the present invention has high strength and is excellent in practical use, especially under conditions of high surface pressure applied as the output of the transmission increases. This eliminates the occurrence of abnormal wear such as bright spot wear and adhesive wear, resulting in excellent wear resistance and 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 Co., Ltd. agent Kazuo Masada and one other person Q; No.

Claims (8)

[Claims] (1) Al: 8.5-15%, Mn: 0.1-8%, S
i: 0.1 to 3.5%, and the rest is Cu and unavoidable impurities (weight%), and at least a contact sliding surface with a mating member. The porosity of the part is 0.0
A synchronous ring for a transmission made of a Cu-based sintered alloy, characterized by having a content of 5 to 5% by volume. (2) Al: 8.5-15%, Mn: 0.1-8%, S
i: 0.1 to 3.5%, and further contains one or two of Zn: 0.1 to 10%, Sn: 0.1 to 4%, and the remainder is It is composed of a Cu-based sintered alloy having a composition (more than % by weight) consisting of Cu and unavoidable impurities, and has a porosity of at least 0.0 on the sliding surface portion that contacts the mating member.
A synchronous ring for a transmission made of a Cu-based sintered alloy, characterized by having a content of 5 to 5% by volume. (3) Al: 8.5-15%, Mn: 0.1-8%, S
i: 0.1 to 3.5%, 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 0.0
A synchronous ring for a transmission made of a Cu-based sintered alloy, characterized by having a content of 5 to 5% by volume. (4) Al: 8.5-15%, Mn: 0.1-8%, S
i: 0.1 to 3.5%, and further contains one or more of Cr, Ti, V, and Zr: 0.1 to 4%, and the remainder is Cu. It is composed of a Cu-based sintered alloy having a composition (by weight %) consisting of unavoidable impurities, and has a porosity of at least 0.0 on the sliding surface portion that contacts the mating member.
A synchronous ring for a transmission made of a Cu-based sintered alloy, characterized by having a content of 5 to 5% by volume. (5) Al: 8.5-15%, Mn: 0.1-8%, S
i: 0.1 to 3.5%, and further contains one or two of Zn: 0.1 to 10%, Sn: 0.1 to 4%, and Fe, Ni, and One or more types of 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 0.0
A synchronous ring for a transmission made of a Cu-based sintered alloy, characterized by having a content of 5 to 5% by volume. (6) Al: 8.5-15%, Mn: 0.1-8%, S
i: 0.1 to 3.5%, and further contains one or two of Zn: 0.1 to 10%, Sn: 0.1 to 4%, and Cr, Ti, and V. , and one or more of Zr: 0.1 to 4%, and the remainder is Cu and unavoidable impurities (weight %), and At least the porosity of the contact sliding surface portion with the mating member is 0.0
A synchronous ring for a transmission made of a Cu-based sintered alloy, characterized by having a content of 5 to 5% by volume. (7) Al: 8.5-15%, Mn: 0.1-8%, S
i: 0.1 to 3.5%, and further contains 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%, with the remainder consisting of Cu and unavoidable impurities (wt%) The porosity of at least the contact sliding surface portion with the mating member is 0.0.
A synchronous ring for a transmission made of a Cu-based sintered alloy, characterized by having a content of 5 to 5% by volume. (8) Al: 8.5-15%, Mn: 0.1-8%, S
i: 0.1 to 3.5%, and further contains one or two of Zn: 0.1 to 10%, Sn: 0.1 to 4%, and Fe, Ni, and One or more types of Co:
0.1 to 6%, and one or more of Cr, Ti, V, and Zr: 0.1 to 4%, with the remainder consisting of Cu and unavoidable impurities (more than 0.1% by weight). ), and the porosity of at least the contact sliding surface portion with the mating member is 0.0.
A synchronous ring for a transmission made of a Cu-based sintered alloy, characterized by having a content of 5 to 5% by volume.