JPH02107729A - Synchronous ring for transmission made of cu-series sintered alloy - Google Patents

Abstract

PURPOSE:To improve the initial comformability of the title ring and to suppress the generation of its abnormal wear by specifying the content of Sn, Mn and Si in a Cu-series sintered alloy and specifying 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 and 0.3 to 5% Si, 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 of 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] [Field of Industrial Application] The present 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.

[Conventional technology]

Conventionally, in general, in a synchronizing ring for a transmission, as illustrated in a perspective view in FIG. The taper cone makes intermittent surface contact under high surface pressure, and a key groove 3 is formed on the unilateral circumferential surface in which the key 1 and the key fit together, and chamfers 2 provided at predetermined intervals along the outer edge of the key groove 2 are also connected to the mating member. Since it has the function of engaging with the chamfer of the barrel hub sleeve, it is required to have strength, wear resistance, and compatibility with the mating member. (
It is widely used. In addition, there is also a so-called bottle-type synchronizing ring, in which a screw is attached to 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, as the output of transmissions has increased in recent years, the above-mentioned conventional high-strength brass synchronizing ring has been designed to reduce the number of mating parts, especially at least one of the upper taper cone, key, and chamfer of the hub sleeve. (The U moving surface is exposed to high blood pressure, which reduces its initial conformability. This leads to frequent abnormal wear such as bright surface wear and adhesive wear, leading to a shortened service life. ing.

[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:l -10%
.

Si: 0.3-5%.

(a) Zn: 0.5-9.5%, Al2
:0.2-5%.

(b) One or more of Fc, Ni, and Co: 0.1 to 6%.

(c) One of Mo, Cr, Nb, Ti, and V
Species or two or more species = 0.1-4%.

Carbon containing one or 28 or more of the above (a) to (e), with the remainder consisting of Cu and unavoidable impurities.
C made of a U-based sintered alloy and having a porosity of at least 0.1 to 10% by volume on the sliding surface that contacts the mating member.
Synchronous rings for transmissions made of U-based sintered alloys include pores with a porosity of 0.1 to 10% by volume, which are present in the contact sliding surface portion with the mating member, including the above composition. Excellent initial conformability is ensured by the above-mentioned 0.1-
A porosity of 10% by volume, or in other words, a high theoretical density ratio of 90 to 99.9%, ensures the high strength required for synchronous rings, which allows use under high surface pressure associated with higher output of transmissions. However, we have found that the occurrence of abnormal wear such as bright surface wear and adhesive wear due to a decrease in initial conformability has been suppressed, and that it 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 the content exceeds 10%, not only will the strength tend to decrease, but the toughness will also decrease, and hot workability will also be impaired. ~10%.

(b) M straight 1 and Si These components combine with each other to form intermetallic compounds that are finely dispersed in the base material, improving strength, abrasion resistance, conformability, and seizure resistance. However, even if & Hm is less than Mn: 196, Si: 0.3
Even if the content is less than 10% for Mn and 5% for Si, no further improvement effect will be obtained. Considering economic efficiency, the content was set to Mn: 1 to 1, respectively.
0%, and Si: 0.3 to 5%.

(e) Zn and Al1 In addition to improving the wear resistance of the base material, these components have the effect of suppressing adhesive wear and preventing burning and scratches caused by this, so they are necessary. Zn: less than 0.5%, and A
If Ω: is less than 0.296, the desired effect of improving the above action cannot be obtained; on the other hand, even if the content exceeds Zn: 9.5% and 8ρ: 5%, the above action will further improve the effect. does not appear, so its inclusion 'Ef can be expressed as Z n
: 0, 5-9, 596, A9: 0.2-5%
It was determined that

(d) Fc, Ni, and C.

These components include solid solution in the base material to strengthen it, as well as bonding with St, as well as Mo and Cr.

When Nb, Ti, and V are contained, they combine with these components to form intermetallic compounds that are finely dispersed in the substrate, thereby improving strength, wear resistance, and seizure resistance. Since it has the effect of causing
If the content is less than 0.1%, the desired effect of improving the above action cannot be obtained, while if the content exceeds 6%, the toughness will decrease, so the content should be reduced to 0. 1~
It was set at 6%.

(e) Mo, Cr, Nb, Ti, and ■ These components include Mn-5L intermetallic compounds dispersed in the substrate into fine spherules, and Mn and Si themselves, as well as Fc, Nl, and When containing Co, it forms a composite compound with these components added, and has the effect of improving strength, toughness, and wear resistance. If the amount 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. The amount of horny content is 0.1 to 496
It was determined that

Incidentally, unavoidable impurities such as Mg and Ca, as well as PB and oxygen, may be added to 36-, but if the total amount of these unavoidable impurities is 1.5% or less, they will not have any effect on the characteristics. Since it is not a lotus, its content is allowed in a proportion that does not exceed 1.5% in total.

(r) Porosity Even if pores become oil pockets during practical use and the contact sliding surface with the mating member is subjected to high blood 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 surface wear and adhesive wear, and improving wear resistance.In addition, the presence of a thin oxide film formed on the pore surface If the ratio is less than 0.1:&ffi%, the desired effect will not be obtained, while if the ratio exceeds 10% by volume, the strength will be low. Since this would make it impossible to put it into practical use, the proportion was set at 0.1 to 1 Og m%.

Note that the above porosity of 01 to 10% by volume cannot be obtained by normal sintering, but can be obtained by using a sintered body with a porosity of about 10% by volume or It is obtained by subjecting a temporarily sintered body 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, Sn powder, Mn powder, S1 powder, and Zn powder, all of which have a particle size of 200mcsh or less.
Powder, A, Q powder, Fc powder, Nj powder, Co powder, M
o powder, Cr powder, Nb powder, Ti powder, and V powder were prepared, and these raw material powders were each blended into the composition shown in Table 1, and after mixing under normal conditions, 4 10
n/ca! (A) Press molded into a green compact at a pressure of 450 to 700 in a hydrogen atmosphere.
After pre-sintering at a predetermined temperature within the range of 550 to 850 °C
(B) Hot forging at a predetermined temperature within the range of °C (hereinafter referred to as A condition), (B) Sintering at a predetermined temperature within the range of 650 to 900 °C in a hydrogen atmosphere, and then within the range of 550 to 850 °C Hot forging at a predetermined temperature (hereinafter referred to as B condition), <C
> Sintering in a hydrogen atmosphere at a predetermined temperature within the range of 650 to 900°C (hereinafter referred to as C condition), by performing sintering processing under any of the conditions A to C above, -J method and 24 which have substantially the same component composition as the formulation I and inner diameter + 50 mm x thickness: 3.3 m
A synchronous ring for a transmission made of Cu-based sintered alloy of the present invention having a chamfer number of 1 (hereinafter referred to as the sintered synchronous ring of the present invention) 1
-40 and Comparative Cu-based sintered alloy synchronizing rings for transmissions (hereinafter referred to as comparative sintered synchronizing rings) 1 to 5 were manufactured, respectively.

In addition, all of the comparative sintered synchronous rings 1 to 5 have the content of one of the constituent components or the porosity (marked with * in Tables 1 and 2) of this invention. It's out of scope.

Next, for the various sintered synchronous rings mentioned above, the porosity and crushing load were determined by al11, and the number of rotations of the tapered cone as the mating member: 1300 r, p, ms. Pressure 6:1 weight: 45 kg, oil type 260. Number gear oil, Ura temperature: 45℃, Taper cone operation: 3 with synchronized time of 0.3 to 0.5
A synchro durability test was carried out under the conditions of 5,000 times, and the amount of depression (amount of wear) on the contact sliding surface with the tapered cone, which is a Mesenbe shrine, no H of adhesive wear, initial (up to 500 times) The friction coefficient and the presence or absence of cracks and deformation of the ring were measured and observed at the later stage (stable period after 500 cycles), 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 40 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 blood pressure there is little change in the coefficient of friction in the initial and late stages. These results show that the ring exhibits only a slight drop, i.e., exhibits excellent wear resistance, as compared to the comparative sintered synchronous rings 1 to 5. 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 be 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 has excellent conformability, especially in practical use under conditions of high surface pressure applied as the output of the transmission increases. 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.

Claims (8)

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