JPS63227747A - Fe sintered alloy synchronizing ring for transmission - Google Patents

Abstract

PURPOSE:To furthermore improve the strength, wear resistance and conformability by specifying the constituents of the main body and chamfer of a synchronizing ring and the porosity of said chamfer. CONSTITUTION:The main body and chamfer 2 of the synchronizing ring consist of, by weight, 0.1-0.9% C and the balance Fe with inevitable impurities (the total of Si, S and P is regulated to <=0.5%) and the porosity of the chamfer 2 is regulated to 0.05-5vol.%. One or more kinds of 0.2-8% Ni and Cu and/or 0.02-0.5% B can be furthermore added to the above-mentioned compsn. at need. In this synchronizing ring, any characteristics among at least the strength, wear resistance and conformability are deteriorated when any requirements of the constitutional requirements are deviated from the above-mentioned areas. Since the titled ring has the high strength and particularly the chamfer has the excellent wear resistance and conformability with the objective members, it can sufficiently correspond to the high outputting, thinning accompanied by light weight and miniaturization of a transmission.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a synchronizing ring for a transmission made of an Fe-based sintered alloy that has high strength, excellent wear resistance, and compatibility with a mating member. be.

[Conventional technology]

Subjected to intermittent surface contact under high surface pressure with percone.

In addition, chamfers 2 provided at predetermined intervals along the outer circumferential surface have the function of engaging with the chamfers of the hub sleeve.
Reducing the number of chamfers and making their shapes smaller is being considered, and from this point of view, it is necessary for the chamfer C2 to have strength, wear resistance, and compatibility with the mating member. Therefore, high-strength brass with these characteristics is often used in its manufacture.The inner surface 1, which is the friction surface with the tearper cone, is coated with paper, resin, or MO. ing.

[Problem that the invention seeks to solve]

However, in recent years, there have been strict demands for higher output and lighter weight for transmissions, and as a result, higher strength, wear resistance, and conformability have been required for synchronous rings. However, the current situation is that conventional high-strength brass products cannot adequately meet this requirement.

[Means for solving problems]

Therefore, the present inventors conducted research to develop a synchronizing ring for a transmission that can fully meet the above requirements, and found that the main body and chamfer were
(% in terms of component composition indicates weight %), C: 0.1 to 0.9%.

and, if necessary, one or two of Ni and Cu: 0.2 to 8%
and B: 0.02 to 0.5%, containing either or both of the following, with the remainder being Fe.
and unavoidable impurities (8i as an unavoidable impurity,
The porosity of the chamfer, which is made of an Fe-based sintered alloy having a composition consisting of S and P (total amount of 0.5% or less) and is formed along at least the edge of the outer peripheral surface, is 0.05.
The synchronizing ring for transmissions made of Fe-based sintered alloy with a capacity of ~5 has high strength, and especially the chamfer has excellent wear resistance and compatibility with mating parts (= excellent, so it is possible to increase the output of the transmission and reduce weight). The synchronization ring of this invention also has the knowledge that it can withstand over 2000 degrees of friction.As is well known, the inner surface of the synchronization ring that will be the friction surface with the taper cone is coated with paper, resin, MO, etc. A similar coating can be applied to achieve the same effect.

Next, in the synchronous ring of the present invention, the reason why the component composition and porosity are limited to two as described above will be explained.

(a) C The C component has the effect of improving strength and wear resistance, but if its content is less than 0.1%, the above effect ≦: the desired effect cannot be obtained; If it exceeds .9%, the toughness decreases and the aggressiveness towards opponents increases (=), so the content was set at 0.1 to 0.9%.

(b) Ni and Cu These components have the effect of improving strength, toughness, wear resistance, and conformability, so they are necessary (=contained as appropriate, but if the content is less than 0.2%) Then, the above action (=
The desired improvement effect was not observed, and even if the content exceeded 8%, no further improvement effect could be obtained, so the content was set at 0.2 to 8%.

(The CI BBE component has the effect of improving sinterability as well as toughness and strength, so it is included as necessary, but if its content is less than 0.02%, it will not achieve the desired effect. However, if the content exceeds 0.5%, the toughness decreases, so the content was set at 0.02 to 0.5%.

Incidentally, Si, 8. However, if the total amount of these components exceeds 0.5%, the strength and toughness will decrease, so the total amount of these components should be 0.5% or less. must be stopped.

(d) Porosity: In particular, the pores in the chamfer formed along the edge of the outer circumferential surface become oil pools during practical use, and enable smooth engagement with the chamfer of the hub sleeve, which is the mating member. , has the effect of improving compatibility with this, but if the proportion is less than 0.05% by volume, the desired effect will not be obtained, while if the proportion exceeds 5% by volume, the strength will decrease. As this increases, the wear also increases, so the ratio was set at 0905% to 5% by volume.

〔Example〕

Next, the synchronization ring of the present invention will be described in more detail as a second embodiment.

As raw material powders, graphite powder, Cu powder, Ni powder, Fe-B alloy (B: 15% content) powder, and Fe powder, all of which have a particle size of 200 mesh or less, were prepared,
After blending these raw material powders into the composition shown in Table 1 and mixing them under normal conditions, 5.5 tons/ai
Pressure C: press-form into green compacts,
After pre-sintering at a predetermined temperature within the range of 00 to 900°C, a portion of these pre-sintered bodies is heated at a temperature of 6 to 8 tons/a.
The pre-sintered body and the re-pressed pre-sintered body are then heated with ammonia. In cracked gas, xo
oo=i2o.

A sintered body having substantially the same composition as the compounding composition is formed by sintering at a predetermined temperature within the range of 800°C for 1 hour. ~1000
The presence or absence of hot forging is indicated in the remarks column of Table 1), and as a result, the various porosity, as well as the Si and S Has an unavoidable impurity content consisting of P, inner diameter = 62 ■φ x thickness = 8
It has dimensions of 1m and has a tapered cone friction surface with a thickness of 0.
The number of outer surface chance areas (218 inventive F
Synchronous rings for transmissions made of e-based sintered alloy (hereinafter referred to as sintered rings of the present invention) 1 to 16 and comparative synchronized rings for transmissions made of Fe-based sintered alloy (hereinafter referred to as comparative sintered rings) 1 to 5 were manufactured, respectively. did.

In addition, comparative sintered rings 1 to 5 were made under any of the conditions of component composition and porosity (those with "Gokushu" in Table 1).
is outside the scope of this invention.

Next, regarding the various sintered rings obtained as a result,
The Vickers hardness was measured, and the number of rotations of the taper cone was measured: s o o r, p, m.

When pressing the taper cone, load: 40 ~, material of the mating taper cone and bub sleeve: SCM-21 carburized and quenched material, synchronization time 20.3 seconds ~ 0.4 seconds (number of times:
A bench test was conducted under the following conditions: 100,000 times), oil = No. 80 transmission oil, oil @ 60℃, and the presence or absence of cracks in the ring body, the amount of depression, and the presence or absence of abnormalities during synchronization. Also the maximum wear amount in chamfer,
The presence or absence of cracking and the presence or absence of abnormalities during synchronization were measured. These results are shown in Table 2.

〔Effect of the invention〕

From the results shown in Table 2, the sintered rings 1 to 16 of the present invention
All have high hardness, crack resistance, wear resistance,
However, as can be seen in Comparative Sintered Rings 1 to 5, if any of the constituent requirements falls outside the scope of the present invention, It is clear that at least one of the characteristics will be inferior.

As mentioned above, the synchronizing ring for a transmission made of an Fe-based sintered alloy of the present invention has high strength, particularly chamfering, excellent wear resistance, and compatibility with a mating member.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating a synchronizing ring for a transmission. 1...Inner side, 2...Changfa.

Claims (4)

[Claims] (1) The main body and chamfer contain C: 0.1 to 0.9%, and the remainder is Fe and unavoidable impurities (however, Si, S, and P as unavoidable impurities are 0.5% in total) The porosity of the chamfer formed along the edge of the outer peripheral surface is at least 0.05 to 5% by volume. Synchronous ring for transmission made of sintered alloy. (2) The main body and chamfer contain C: 0.1 to 0.9%, and further one or two of Ni and Cu: 0.2 to 8%
, and the remainder is Fe and unavoidable impurities (However, the unavoidable impurities Si, S, and P are 0.5% in total.
The porosity of the chamfer formed at least along the edge of the outer peripheral surface is 0.05 to 5% by volume. Synchronous ring for transmission made of sintered metal. (3) The main body and chamfer contain C: 0.1 to 0.9%, further contain B: 0.02 to 0.5%, and the remainder is Fe and unavoidable impurities (however, unavoidable impurities It is composed of an Fe-based sintered alloy having a composition (the total amount of Si, S, and P as impurities is 0.5% or less) (or more than 0.5% by weight), and is formed at least along the edge of the outer peripheral surface. A synchronizing ring for a transmission made of an Fe-based sintered alloy with a chamfer having a porosity of 0.05 to 5% by volume. (4) The main body and chamfer contain C: 0.1 to 0.9%, and further one or two of Ni and Cu: 0.2 to 8%
, B: 0.02 to 0.5%, and the remainder is Fe and unavoidable impurities (however, the total amount of Si, S, and P as unavoidable impurities is 0.5% or less) (or more) % by weight), and the porosity of the chamfer formed along at least the edge of the outer peripheral surface is 0.05 to 5% by volume. sync ring.