JPH0273903A - Synchronous ring for change gear made of sintered fe alloy impregnated with synthetic resin - Google Patents

Abstract

PURPOSE:To obtain a synchronous ring for a change gear having improved initial conformability, wear resistance and stability of coefft. of friction at the time of synchronism by impregnating a sintered Fe alloy body having a specified C content and a specified porosity with synthetic resin to form the ring. CONSTITUTION:A sintered Fe alloy body having 3-20vol.% porosity and a compsn. consisting of 0.1-0.9wt.% C and the balance Fe with inevitable impurities or further contg. 0.2-10wt.% Ni and/or Cu and/or 0.02-0.5wt.% B and/or P is impregnated with synthetic resin to form a synchronous ring for a change gear. The toal amt. of Si, S and O among the impurities is regulated to about <=1wt.% and phenol resin, urea resin or epoxy resin may be used is the synthetic resin. The synchronous ring stably exhibits superior performance over a long period of time.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a transmission made of a synthetic resin-impregnated Fe-based sintered alloy that has particularly excellent initial conformability, stability of the friction coefficient during synchronization, and wear resistance. This relates to an aircraft synchronization ring.

[Conventional technology]

In general, as illustrated in the perspective view of FIG. 1, a synchronizing ring for a transmission has an inner surface l that undergoes intermittent surface contact under high surface pressure with a rotating tapered cone, and an outer peripheral surface that is Since the chamfers 2 provided at predetermined intervals along the hub have the function of engaging with the chamfers of the hub sleeve, they are required to have strength, wear resistance, and compatibility with the mating member. Synchronous rings are also made of various Fe-based sintered forged alloys, but in addition to this, synchronizing rings have screws on the outer periphery that rub against the mating tapered cone, commonly known as pins. There are other types, such as double cone type and triple cone type.

[Problem to be solved by the invention]

However, in recent years there have been strict demands for higher output and higher speeds for transmissions, and as a result, synchronizer rings are required to have even better initial run-in, stability of the friction coefficient during synchronization, and wear resistance. However, conventional high-strength brass and Fe-based sintered forged alloys are
At present, it is not possible to adequately address this issue.

[Means to solve the problem]

Therefore, the present inventors conducted research to develop a synchronizing ring for transmissions that can fully meet the above requirements. ), C20, 1 to 0.9%, and if necessary, (a) one or two of Nl and Cu: 0.2
~10%, (b) One or two of B and P = 0.0
2 to 0.5%, one or both of the above (a) and (b), with the remainder consisting of Fe and unavoidable impurities, and a porosity of 3 to 20% by volume. If it is necessary to further improve the wear resistance of the Fe-based sintered alloy body, although it is not necessarily necessary, the Fe-based sintered alloy body may be subjected to carburizing and quenching treatment or nitriding treatment under normal conditions. After carbonitriding, synthetic resins such as phenolic, urea, epoxy, silicone, and polyester resins (in this case, the synthetic resin is mixed with a predetermined amount of metal powder, cellulose material, glass fiber, etc.) Synchronizing rings for transmissions impregnated with a mixture of It was discovered that the stability of the friction coefficient and wear resistance are even better, and that it can fully support higher output and higher speed transmissions.

This invention has been made based on the above findings, and the reason why the composition and porosity of the Fe-based sintered alloy body are limited as described above will be explained below.

(a) CC The C component has the effect of improving strength and wear resistance, but if its content is less than 1%, the desired effect cannot be obtained; If it exceeds 9%, not only will the toughness decrease, but also the aggressiveness against opponents will increase, so the content was set at 0.1 to 0.9%.

(b) Ni and Cu These components have the effect of improving toughness and conformability, so they are included as necessary, but if their content is less than 0.2%, the desired improvement effect on the above effects may not be achieved. On the other hand, even if the content exceeds 10%, no further improvement effect will be obtained.Considering economic efficiency, the content should be reduced to 0.
．． It was set at 2 to 10%.

(c) B and P These components have the effect of further improving sinterability and thereby increasing strength, so they are included as necessary, but
If the content is less than 0.02%, the desired effect of improving the above action cannot be obtained, while if the content exceeds 0.5%, the toughness will decrease. 0
．． It was set at 02 to 0.5%.

Incidentally, it contains Si, S, and oxygen as unavoidable impurities, but if the content of these components exceeds 196, the strength and toughness will decrease. It must be limited to the content.

(d) Porosity The pores are filled with synthetic resin, which further improves initial conformability, stability of the friction coefficient during synchronization, and wear resistance. If the porosity is less than 3% by volume, impregnation with the synthetic resin will be insufficient and the above-mentioned effect cannot be fully exerted, while if the porosity exceeds 20% by volume, the strength of the main body itself will decrease and The porosity should be set to 3 to 20 because it would no longer be practical under certain conditions.
It was determined as capacity%.

〔Example〕

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

Raw material powders include Fe powder, graphite powder, Ni powder, Cu powder, and F powder, all of which have a particle size of 200 mcsh or less.
An e-B alloy (containing B + 15%) powder and a Fe-P alloy (containing P: 13%) powder were prepared, and these raw material powders were blended into the composition shown in Table 1, and heated in a ball mill for 72 hours. After time mixing and drying, 3~8Lon
The green compacts are press-molded at a predetermined pressure within the range of /cJ, and the green compacts are heated to
Fe-based sintered material is produced by sintering at a predetermined temperature within the range of 1280°C for 1 hour and having substantially the same composition as the blended composition and having the porosity shown in Table 1. A synchronous ring made of Fe-based sintered alloy impregnated with the synthetic resin of the present invention (hereinafter referred to as a synchronous ring impregnated with the resin of the present invention) is produced by manufacturing a composite body and then impregnating it with a synthetic resin of the type shown in Table 1 under normal conditions. Rings 1 to 26 (referred to as rings) were manufactured, respectively.

Also, for comparison purposes, Cu-30%Zn-1%Al-2
%Nl (hereinafter referred to as conventional brass ring), and Fe-0,
A Fe-based sintered alloy body with a theoretical density ratio of 91% having a composition of 8%C-0.3%Mn-0.4%Mo-0.1%S was hot forged at 1150°C. Theoretical density ratio = 9
A synchronous ring made of a Fe-based sintered forged alloy (hereinafter referred to as a conventional Fe-based sintered forged alloy ring) containing 9% Fe-based sintered forged alloy was prepared.

Next, for the various rings obtained as a result, the rotation speed of the tapered cone which is the mating material: 2500 r, p
,m,, Sharpness of the same taper cone: SCM21 carburized and quenched material, pressing load + 45kg.

Oil: 20W engine oil, oil temperature near 0℃ Taper cone operation mode: 1.5 seconds by pressing for 0.8 seconds
Single unit wear test under the following conditions: 10,000 cycles, rotation speed of the taper cone: 1.20 Or, pl, and pressing load of the taper cone: 55 kg.

Materials of the mating tapered cone and hub sleeve:
SCM21 carburized and quenched material, synchronization time 20.3 to 0.4 seconds (number of times: 50,000 times), oil
A bench test was conducted under the following conditions: No. 90 transmission oil, oil temperature: 70℃, and in the former single wear test, the presence or absence of cracks in the ring, and the maximum amount of wear on the tapered cone friction surface (hereinafter referred to as the inner surface) of the ring were conducted. , the maximum wear amount of the mating material (the maximum wear amount is shown by the amount of fall of a standard product prepared with a constant volume of fall #j), the presence or absence of seizure on the inner surface of the ring, and the initial state of the inner surface of the ring. (up to 500 times) and late (stable period) friction coefficient,
The presence or absence of initial wear on the inner surface of the ring was also observed, and in the latter bench test, the presence or absence of abnormal wear of the chamfer and the presence of abnormal noise during synchronization were measured.

These results are shown in Table 1.

〔Effect of the invention〕

From the results shown in Table 1, none of the rings had cracks or internal seizures, nor did they produce abnormal wear or abnormal noise. It is clear that this ring has excellent initial conformability, stability of friction coefficient during synchronization, and wear resistance compared to Fe-based sintered forged alloy rings.

As mentioned above, the synthetic resin-impregnated Fe-based sintered metal synchronizing ring for transmissions of the present invention has much better initial conformability and a lower coefficient of friction during synchronization than the conventional synchronizing rings for transmissions described above. Due to its stability and wear resistance, it can fully support higher output and higher speed transmissions.
It has industrially useful properties such as stably exhibiting 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... Tapered cone friction surface (inner surface) 2... Chamfer

Claims (1)

[Scope of Claims] (1) C: 0.1 to 0.9%, the remainder being Fe and unavoidable impurities (weight%), and a porosity of 3 to 20% by volume. have F
A synchronizing ring for a transmission made of a synthetic resin-impregnated Fe-based sintered alloy, which is made by impregnating an e-based sintered alloy body with synthetic resin. (2) Contains C: 0.1 to 0.9%, and further contains one or two of Ni and Cu: 0.2 to 10%, with the remainder being Fe and unavoidable impurities. F having a composition (more than % by weight) and a porosity of 3 to 20% by volume
A synchronizing ring for a transmission made of a synthetic resin-impregnated Fe-based sintered alloy, which is made by impregnating an e-based sintered alloy body with synthetic resin. (3) Contains C: 0.1 to 0.9%, and further contains one or two of B and P: 0.02 to 0.5
%, with the remainder consisting of Fe and unavoidable impurities (wt%), and a porosity of 3 to 20% by volume.
A synchronizing ring for a transmission made of a synthetic resin-impregnated Fe-based sintered alloy, which is made by impregnating an e-based sintered alloy body with synthetic resin. (4) Contains C: 0.1 to 0.9%, and further contains one or two of Ni and Cu: 0.2 to 10%, and one or two of B and P. Seed: 0.02-0.5
%, with the remainder consisting of Fe and unavoidable impurities (wt%), and a porosity of 3 to 20% by volume.
A synchronizing ring for a transmission made of a synthetic resin-impregnated Fe-based sintered alloy, which is made by impregnating an e-based sintered alloy body with synthetic resin.