JPH07126778A - Synchronizer ring material made of cu alloy for automobile gearbox, excellent in seizure resistance - Google Patents

Abstract

PURPOSE:To produce a synchronizer ring material made of Cu alloy for automobile gearbox, excellent in seizure resistance. CONSTITUTION:The synchronizer ring material for automobile gearbox is constituted of a Cu alloy which has a composition consisting of, by weight, 20-40% Zn, 2-11% Al, 1-5% of one or >=2 elements among Fe, Ni, and Co, 0.1-4% Ti, 0.01-0.7% Mg, 0.01-0.5% Cr, and the balance Cu with inevitable impurities and further containing, if necessary, 0.005-0.5% Si.

Description

Detailed Description of the Invention

[0001]

This invention has excellent seizure resistance,
Therefore, the present invention relates to a Cu alloy synchronizer ring material for an automobile transmission, which exhibits excellent wear resistance for a long period of time.

[0002]

2. Description of the Related Art Conventionally, as a synchronizer ring for an automobile transmission, as described in Japanese Patent Laid-Open No. 64-239, in terms of weight% (hereinafter,% means weight%), Zn: 17
-40%, Al: 2-11%, one or more of Fe, Ni, and Co: 0.02-3
%, Ti: 0.1 to 3.5%, Mg: 0.003 to
It is known that the synchronizer ring contains 0.3%, Si: 0.005 to 0.5%, and the balance is made of a Cu alloy having a composition of Cu and inevitable impurities. As illustrated in the perspective view of FIG. 1, the inner surface 1 is subjected to intermittent sliding contact with the rotating tapered cone under high surface pressure and intermittent discontinuous contact, and a key is fitted on the outer peripheral surface. The mating key grooves 3 are formed, and the chamfers 2 provided at predetermined intervals along the outer edge thereof also have a function of engaging with chamfers of a hub sleeve which is also a mating member.

[0003]

On the other hand, with the recent increase in the output of automobiles, the above-mentioned synchronizer ring, which is a structural member of the transmission, has operating conditions of high load and high speed rotation. In the conventional Cu alloy synchronizer ring material, the seizure is apt to occur between itself and the tapered cone that is the counterpart member under the above-mentioned high load and high speed rotation conditions, which promotes the progress of wear, resulting in a relatively short time. At present, the service life is reached in time.

[0004]

Therefore, the present inventors have
From the above viewpoints, as a result of paying attention to the above-mentioned conventional Cu alloy synchronizer ring material and conducting research to improve seizure resistance thereof, the synchronizer ring material was
Zn: 20-40%, Al: 2-11%, F
One or more of e, Ni, and Co: 1
~ 5%, Ti: 0.1-4%, Mg: 0.01
.About.0.7%, Cr: 0.01 to 0.5%, and if necessary, Si: 0.01 to 0.5%, with the balance being Cu and inevitable impurities. C with composition
It has been shown that, when composed of u alloy, the resulting Cu alloy synchronizer ring material has excellent seizure resistance and exhibits excellent wear resistance for a long period of time even under high load and high speed rotation conditions. I got it.

The present invention was made based on the above research results, and the reason why the composition of the Cu alloy constituting the synchronizer ring material is limited to the above is explained below. (A) Zn and Al Both of these components have the effect of improving the strength and toughness in the coexisting state. Therefore, if any of these components has Zn: less than 20% and Al: less than 2%, It is impossible to secure desired strength and toughness, while Zn: 4
When the content exceeds 0% and Al: 11%, the toughness decreases, so the content is Zn: 20-40%, preferably 25-40%, and Al: 2-11%, preferably 2-. It was set at 7%.

(B) Fe, Ni, and Co, and Ti Fe, Ni, and Co (hereinafter collectively referred to as an iron group metal) and the Ti component form an intermetallic compound in the coexisting state. , Which has the function of improving the wear resistance by being evenly dispersed in the matrix, but the content of either of these components is less than 1% of the iron group metal and Ti:
If it is less than 0.1%, the desired effect of improving the wear resistance cannot be obtained, while the iron group metal:
If the content exceeds 5% and Ti: 4%, the toughness will decrease. Therefore, the content of iron group metal: 1-5%, preferably 2-4%, and Ti: 0.1-4%, It is preferably set to 0.5 to 3%.

(C) Mg The Mg component has an action of improving hardness, particularly high temperature hardness, and thereby exerting excellent wear resistance under operating conditions of high load and high speed rotation. Is 0.01%
If the content is less than the above, the desired effect cannot be obtained, while if the content exceeds 0.7%, the toughness decreases, so the content is 0.01 to 0.7%, preferably It was set at 0.05 to 0.5%.

(D) Cr The Cr component has the effect of significantly improving seizure resistance under operating conditions of high load and high speed rotation, and exhibiting excellent abrasion resistance for a long period of time. If the content is less than 0.01%, the desired excellent seizure resistance cannot be ensured, while if the content exceeds 0.5%, the toughness tends to decrease. Was set to 0.01 to 0.5%, preferably 0.02 to 0.3%.

(E) Si The Si component has a function of further improving the high temperature hardness similarly to the Mg component and contributing to further improvement of the wear resistance under the operating conditions of high load and high speed rotation. However, if the content is less than 0.01%, the desired effect of improving the above-mentioned action cannot be obtained, while the content is less than 0.
If it exceeds 5%, the toughness will decrease, so the content is 0.01-0.5%, preferably 0.02-.
It was set at 0.3%.

[0010]

EXAMPLES Next, the synchronizer ring material of the present invention will be specifically described by way of examples. In a low frequency melting furnace,
A Cu alloy having the composition shown in Tables 1 and 2, respectively, was melted and made into an ingot with a diameter of 200 mm by a semi-continuous casting method, and this ingot was hot extruded at 750 ° C. to have a diameter of 57 mm and an inner diameter. : 45 mm cylindrical material, cut out a material with a width of 10 mm from this cylindrical material, and use 750 ° C for this material.
With hot die forging, minimum inner diameter: 50 mm x thickness: 6 mm
The synchronizer ring material of the present invention having the following dimensions (hereinafter,
1 to 24 of the present invention and a conventional synchronizer ring material containing no Cr as an alloy component (hereinafter,
Conventional ring materials) 1 and 2 were manufactured respectively.

Next, these ring materials are assembled into a transmission in a state of being machined into the shape shown in FIG. 1, oil: 75 W of transmission oil, load on the lever:
120kg, synchronization time: 0.3-0.35 seconds, oil temperature: 8
Durability test was performed under the conditions of 0 ° C, clutch plate rotation speed: 4000 rpm, mating taper cone material: carburized and quenched steel, number of times: 20,000, contact with taper cone for the purpose of evaluating seizure resistance The separation time was measured on the inner surface, which is the sliding surface, immediately after the start of operation and immediately before the end of operation. Further, the amount of wear (the amount of depression) on the inner surface after the test was also measured. The measurement results are shown in Tables 4 and 5.

[0012]

[Table 1]

[0013]

[Table 2]

[0014]

[Table 3]

[0015]

[Table 4]

[0016]

[Table 5]

[0017]

From the results shown in Tables 4 and 5, the ring materials 1 to 25 of the present invention showed almost no change in the separation time immediately after the start of operation and immediately before the end of the operation, and in both cases, the separation time was It is short, which shows that it exhibits excellent seizure resistance, and as a result, it also exhibits excellent wear resistance, while the conventional ring In the materials 1 and 2, the separation time was longer immediately before the end of operation than immediately after the start of operation, which means that the seizure phenomenon occurred. As a result, it is apparent that the progress of wear is accelerated. As described above, the Cu alloy synchronizer ring material of the present invention exhibits excellent seizure resistance under operating conditions of high load and high speed rotation. Therefore, when used as a structural member of a transmission, a high output of an automobile is obtained. It brings about industrially useful effects such as being able to fully satisfy the requirements.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a synchronizer ring of an automobile transmission.

[Explanation of symbols]

 1 inner surface 2 chamfer 3 keyway

Claims (2)

[Claims] 1. By weight%, Zn: 20 to 40%, Al: 2 to 11%, one or more of Fe, Ni, and Co:
1 to 5%, Ti: 0.1 to 4%, Mg: 0.01 to 0.7
%, Cr: 0.01 to 0.5%, and the balance being composed of a Cu alloy having a composition of Cu and inevitable impurities. Cu of an automobile transmission having excellent seizure resistance, characterized in that
Alloy synchronizer ring material. 2. By weight%, Zn: 20-40%, Al: 2-11%, one or more of Fe, Ni, and Co:
1 to 5%, Ti: 0.1 to 4%, Mg: 0.01 to 0.7
%, Cr: 0.01 to 0.5%, and Si: 0.01 to 0.5%, with the balance being a Cu alloy having a composition of Cu and inevitable impurities. Cu for automobile transmissions with excellent seizure resistance characterized by
Alloy synchronizer ring material.