JPH0250929A - 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 Cu sintered alloy contg. specified Al, Fe, Ni, Co, Cr, Ti, V and Zr and regulating the porosity in the contact sliding face part with the mating members to prescribed one. CONSTITUTION:The synchronous ring for a change ring made of a Cu sintered alloy is formed with the compsn. constituted of, by weight, 8.5 to 15% Al, one or more kinds among 0.1 to 6% Fe, Ni and Co, one or more kinds among 0.1 to 4% Cr, Ti, V and Zr and the balance Cu. 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 conformability with the mating members in the contact sliding face and furthermore has excellent wear resistance.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides 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.

[Conventional technology]

Conventionally, as shown in the perspective view of FIG. 1, a synchronizing ring for a transmission generally has an inner surface that comes into contact with a rotating tapered cone, and a tapered cone that is a mating member on this contact sliding surface. 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 interlocking with the chamfer of the sleeve, it is required to have strength, wear resistance, and compatibility with the mating member, so high-strength brass, which has these characteristics, is often used for manufacturing. has been done. 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, in the conventional high-strength brass synchronous link mentioned above, the contact sliding of at least one of the mating members of the tapered cone, key, and chamfer of the hub sleeve has become more difficult. As the dynamic surface is subjected to high surface pressure, initial conformability is reduced, which leads to frequent occurrence of abnormal wear such as bright wear and adhesive wear, leading to a shortened service life. .

[Failure 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 Aρ :8.5-15%.

20.1 to 6% of one or more of Fe, Ni, and Co;

One or more of Cr, Ti, V, and Zr = 0.1 to 4%.

and, if necessary, Zn: 0.1-10%, Sn: 0.1-4% Mn:
0.1-8%.

It is composed of a Cu-based sintered alloy having a composition of one or more of the following, and the remainder is Cu and unavoidable impurities, and the porosity of at least the contact sliding surface portion with the mating member is reduced. In a synchronous ring for a transmission made of Cu-based sintered alloy with a content of 0.05 to 5% by volume,
In both cases, excellent initial conformability is ensured by the porosity of 0.05 to 5% by volume of pores present in the contact sliding surface portion with the mating member, including the above composition, and the above-mentioned 0. Porosity of .05 to 5% by volume, in other words 95 to 99
．． The high theoretical density ratio of 5% ensures the high strength required for synchronizing rings, and even when used under high surface pressure due to the high output of transmissions, there is no shine wear or condensation caused by poor initial conformability. They found that the occurrence of abnormal wear such as wear and tear 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) Aρ Aβ component is a component that determines the base structure of the alloy,
In addition to improving the wear resistance of the base material, it provides the necessary strength to the synchronous ring, and also prevents adhesive wear caused by plastic flow caused by local high-temperature heating (a type of abnormal wear as described above).
However, if the 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) Fe, Ni, and Co with cr, Ti
,V.

Cr, Tj, V, and Zr combine with each other to form intermetallic compounds that are finely dispersed in the base material, which has the effect of improving strength and wear resistance. If the content is less than 0.1%, the desired effect cannot be obtained, while if the content exceeds 6% and 4%, respectively, the amount of intermetallic compounds becomes too large and the cutting The content of FeNiCo is 0.1 to 6%,
The content of Cr, TiV, and Zr was determined to be 0.1 to 4%.

(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 their content or Zn:o , less than 1% and S n: less than 0.1%, the desired effect of improving the above action cannot be obtained;
]00% and Sn: Since further improvement effect does not appear due to the above action even if it exceeds 4%, the content is
Zn: 0. ] ~10%, Sn: 0.1~4%.

(d) Mn The Mn component has the effect of forming a solid solution in the base material and strengthening it, as well as making intermetallic compounds into fine spherules, thereby improving strength and wear resistance, so it may be included as necessary. However, 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 8%, no further improvement effect will be obtained. .1 to 8%.

Incidentally, unavoidable impurities such as P, Pb1, and Mg may be contained in some cases, but these unavoidable impurities do not affect the characteristics in any way if the content is 1.5% or less. In a proportion not exceeding 1.5% in quantity,
Its inclusion is permissible.

(e) Porosity: Even if the pores become oil pockets during practical use and the sliding surface in contact with the mating part is subjected to high surface pressure, it prevents the initial conformability from deteriorating.
Rather, it has the effect of counteracting this, further suppressing the temperature rise, thereby preventing the occurrence of bright wear and adhesive wear, and improving wear resistance. The presence of oxide has the effect of normalizing wear, but 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. Since this would make it impossible to put it into practical use, 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.

Raw material powders include Aρ coarse powder Fe powder, Ni powder, Co powder, and Cr powder, all of which have a particle size of 200 mesh or less.
Powder, Ti powder, ■ powder, Zr powder, Zn powder, Sn powder, and Mn powder are prepared, and these raw material powders are each blended into the composition shown in Table 1, and mixed under normal conditions. ion/C♂ pressure, and then this green compact is pre-sintered at a predetermined temperature within the range of 450 to 700°C in a (A) hydrogen atmosphere. Hot forging at a predetermined temperature within the range of 550 to 850 °C (hereinafter referred to as A condition), ] 0 (B) After sintering at a predetermined temperature within the range of 650 to 900 °C in a hydrogen atmosphere, Hot forging at a predetermined temperature within the range (hereinafter referred to as B condition), (C) Sintering at a predetermined temperature within the range of 650 to 900°C in a hydrogen atmosphere (hereinafter referred to as C condition), above A-C. By performing sintering treatment under any of these conditions, it has substantially the same composition as the blended composition, and has an inner diameter of 54 mm+
X Thickness: Synchronous ring for transmission made of Cu-based sintered alloy of the present invention having a dimension of 3.5 mm and a number of chamfers of 24 (
Synchronizing rings 1 to 18 (hereinafter referred to as sintered synchronous rings of the present invention) and comparative synchronous rings 1 to 6 for transmissions made of a Cu-based sintered alloy (hereinafter referred to as comparative sintered synchronous 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 testing machine using a sample divided into three rings), and the rotation speed of the tapered cone, which is the mating member: 1000 r,
p, m,, Pressing load: eokg.

Oil type Near 5W transmission oil, oil temperature
: 80℃, 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 18 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. 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. As a result, abnormal wear such as bright spot wear and adhesive wear does not occur, so 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...Keyzoyama Ganjinji Mitsubishi Metals Corporation

Claims (4)

[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%, 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. (2) 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%, furthermore, Zn: 0.1 to 10%, Sn: 0 .1 to 4%, and the remainder is Cu and unavoidable impurities. The porosity of the contact sliding surface 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. (3) 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%, and further contains Mn: 0.1 to 8%. , the remainder is Cu-based sintered alloy having a composition (more than % by weight) consisting of Cu and unavoidable impurities, and the porosity of at least the sliding surface portion in contact 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. (4) 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%, furthermore, Zn: 0.1 to 10%, Sn: 0 .1 to 4%, and Mn: 0.1 to 8%, and the remainder is Cu and inevitable impurities (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.