JPS63238257A - Synchronous ring for change gear made of cu alloy - Google Patents

Abstract

PURPOSE:To obtain a synchronous ring for a change gear having superior initial fitness and wear resistance by forming an Al2O3-based oxide layer of a specified thickness on the contact surface of a ring made of a Cu alloy having a specified compsn. consisting of Zn, Al, Si, Mn and Cu. CONSTITUTION:A synchronous ring for a change gear is made of a Cu alloy having a compsn. consisting of, by weight, 20-40% Zn, 2-8% Al, 0.2-2% Si, 0.1-5% Mn and the balance Cu with inevitable impurities or further contg. 0.1-3% Sn and/or 0.05-1.5% one or more among Ti, Zr and Cr. An Al2 O3-based oxide layer of 0.1-10mum average thickness is then formed on the desired part of the contact surface of the ring brought into contact with the opposite member. The oxide layer is formed by treatment in the air at a prescribed temp. for a prescribed time. Thus, a synchronous ring for a change gear made of the Cu alloy and having high strength and toughness is obtd. The contact surface has superior initial fitness and exhibits such superior wear resistance that abnormal wear is not caused.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a synchronizing ring for a transmission made of a Cu-based alloy, which has particularly excellent initial conformability of the contact surface with a mating member and excellent wear resistance. It is something.

[Conventional technology]

Conventionally, as shown in the perspective view of FIG. 1, a synchronizing ring for a transmission generally has an inner surface 1 that is in contact with a rotating tapered cone, and a tapered cone, which is a mating member, is high on this contact surface. A key groove 3 is formed on the unilateral circumferential surface of the hub sleeve, which is a mating member, and chamfers 2 provided at predetermined intervals along its outer edge are intermittently in surface contact under surface pressure. Because it has the function of interlocking with the chamfer, it is required to have strength, wear resistance, and compatibility with mating parts, so high-strength brass with these characteristics is often used in its manufacture. There is. In addition, there is also a so-called pin type synchronizing ring, which has a thread on the outer circumferential side and rubs against the mating member teal f-/Z-cone on the outer circumferential side.

[Problem that the invention seeks to solve]

However, with the increase in the output of transmissions in recent years, the conventional high-strength brass synchronizing ring mentioned above is particularly difficult to connect with at least one of the mating members of the above-mentioned taper cone, key, and chamfer of the hub sleeve. As the contact surface is subjected to high surface pressure, the initial conformability decreases, leading to frequent abnormal wear such as bright wear and adhesive wear, and shortening the service life. ing.

[Means for solving problems]

Therefore, the present inventors conducted research to solve the problems of the conventional high-strength brass synchronizing ring for transmissions as described above, and found that Zn : 20-40%, Aj: 2-8%.

Contains Si: 0.2 to 2%, Mn: 0.1 to 5%, and if necessary, Sn: 0.1 to 3% and one or more of Ti, Zr, and cr. 2 or more poles: 0.05 to 1.5%, composed of a CUU alloy having a composition containing either or both of the following, with the remainder consisting of CU and unavoidable impurities, and at the required locations on the contact surface with the mating member. That is, an oxide film layer mainly composed of aluminum oxide (Aj2o3) is formed on the contact surface of the taper cone, key, and at least one of the mating parts of the chamber 7 of the hub sleeve.
The CU alloy transmission cutting ring formed with an average layer thickness of 10 μm exhibits excellent initial conformability even under the high surface pressure associated with the high output of transmissions, and is They found that the occurrence of abnormal wear can be suppressed.

This invention has been made based on the above knowledge, and the reason why the component composition and the average layer thickness of the oxide film layer are limited to the above-mentioned standard will be explained.

(a) Zn and M These components determine the base structure of the alloy. They improve the wear resistance of the base, provide the strength and toughness necessary for the synchronous ring, and further improve the initial conformability. An oxide film layer that is good and prevents bright part abrasion caused by metal-to-metal wear and seizure caused by adhesion, that is, A1203-ZnO2 based mainly on Al2O3 or Al20. -ZnO
It is an essential component for forming a 2-CuO-based oxide film layer on the ring entrance surface, but if its content is less than Zn: 204 and A1 = 2%, it is difficult to ensure the desired characteristics and oxide film layer. On the other hand, the content is Zn:40
% and A1: If the content exceeds 8%, the toughness will decrease, so the content should be adjusted to Zn: 20 to 4.
0%, Al: 2 to 8%.

(b) Si and Mn These components combine with each other to form intermetallic compounds that are finely dispersed in the matrix, improving the strength and toughness of the ring, and also improving the wear resistance. In addition, it is dispersed in the oxide film layer and has the effect of improving seizure resistance, but the content is less than 0.2% for Si and Mn:
If the content is less than 0.1%, the desired effect cannot be obtained; on the other hand, if the content is Si: 2% and Mn: 5%, respectively.
If the content exceeds 2%, slag will be generated more during melting, so the content should be adjusted to Si: 0.2-2% and Mn: 0.1-2%.
It was set at 5%.

(c) The 5n Sn component has the effect of preventing adhesive wear and ensuring excellent anti-seizure properties, so it is included as necessary, but the content is less than 0.1%. In this case, the desired effect of improving the above-mentioned action cannot be obtained, and on the other hand, if the content exceeds 3 g, the hot workability will decrease.
Its content was determined to be 0.1 to 3%.

(d) Ti, Zr, and Cr These components include Mn-8i-based intermetallic compounds dispersed in the substrate, which are made into fine spherules, and which also contain Mn and S.
It forms a composite compound with L and has the effect of improving strength, toughness, and wear resistance, so it is included as necessary, but if its content is less than 0.05%, it will not improve the desired effect. However, even if the content exceeds 1.5%, no further improvement effect will be obtained.Considering economic efficiency, the content is set at 0.05% to 1.5%. Ta.

In addition, unavoidable impurities such as P, Pb, and even Mg may be contained, but if the content of these unavoidable impurities is 1% or less, they will not affect the characteristics in any way, so the total amount Containment is permitted within a range of 1% or less.

(e) Oxide film layer The oxide film layer has many microscopically small bores, and these bores act as oil reservoirs during practical use to improve initial conformability, and the rings come into frictional contact during synchronization. However, since this oxide film layer has low thermal conductivity, it has the effect of suppressing the temperature from rising inside the ring body.Furthermore, this oxide film layer has a bright part. It has the effect of promoting normal wear without causing abnormal wear such as abrasion or adhesive wear, but if the average layer thickness is less than 0.1 μm, the desired effect cannot be obtained; If it exceeds 10 μm, chipping and peeling tend to occur, so the average layer thickness was set at 0.1 to 10 μm.

〔Example〕

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

Using an ordinary high-frequency furnace, prepare Cu-based alloy melts having the compositions shown in Table 1, and cast gold.
A billet of diameter: 200uφ x length: 400 pieces is formed, and this billet is extruded into a round bar with a diameter of 260Hφ using an extrusion press.After cutting this round bar into a predetermined length, the cut pieces are Hot forging is carried out at a temperature within the range of
By heating to a predetermined temperature within the range of 350 ° C. for a predetermined time within the range of 15 minutes to 6 hours, an oxide film layer with an average layer thickness shown in Table 1 is formed on the entire surface, and the inner diameter: Synchronous rings 1 to 22 of the present invention and comparative synchronous rings 1 to 7 having dimensions of 58 mm (φ) x thickness: 4 N and number of chamfers: 36 were manufactured, respectively.

In addition, Comparative Synchronization Rings 1 to 7 are those in which any of the five conditions (those marked with * in Table 1) of the component composition and the average layer thickness of the oxide film layer are outside the scope of this invention. .

Next, regarding the various synchronization rings obtained as a result, the rotation speed of the tapered cone, which is the mating member: 1000r-
P + m, , Pressing load: 55 Yu, Oil = No. 80 transmission oil, Oil temperature near 0℃, Taper cone operation: 20,000 times with synchronization time of 0.25 to 0.3 seconds, synchro durability test under the following conditions. performance, amount of depression (amount of wear) on the inner surface of the ring, presence or absence of adhesive wear, initial (50
0 times) and late period (stable period) were measured and observed, and the number of rotations of the tapered cone as the mating member: zoo.

r, p, m,, Pressing load: 90kg, Yuji No. 80 mission oil, Oil temperature near 0℃.

Operation of taper cone: A synchro durability test was conducted 5000 times with a synchronization time of 0.25 to 0.3 seconds under the following conditions, and the presence or absence of cracks and deformation in the ring was observed. These results are applied to WJ1
Shown in the table.

〔Effect of the invention〕

From the results shown in Table 1, the synchronization rings 1 to 22 of the present invention
Both have high strength and toughness, and exhibit excellent conformability in the initial stage of practical use, no abnormal wear, and excellent wear resistance, even under high surface pressure conditions. As seen in Comparative Synchronization Rings 1 to 7, it is clear that if any of the constituent requirements falls outside the scope of the present invention, at least one of the above characteristics will be inferior. . It goes without saying that similar results can be obtained with a pin-type synchronous ring.

As mentioned above, the Cu-based alloy synchronizing ring for transmissions of the present invention has high strength and toughness, and is particularly good in initial conformability, making it suitable for practical use under harsh conditions associated with higher output of transmissions. Even during this process, there is no occurrence of abnormal wear such as pyroxene wear or adhesive wear, and it exhibits excellent wear resistance over an extremely long period of time.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating a synchronizing ring for a transmission. 1... Tapered cone friction surface (inner surface), 2... Chamfer, 3... Keyway.

Claims (4)

[Claims] (1) Zn: 20-40%, Al: 2-8%, Si: 0
．． 2-2%, Mn: 0.1-5%, and the remainder is C.
It is made of a Cu-based alloy having a composition (the above weight %) consisting of U and unavoidable impurities, and an oxide film layer mainly composed of aluminum oxide is coated at the required locations on the contact surface with the mating member.
A synchronizing ring for a transmission made of a Cu-based alloy formed with an average layer thickness of 1 to 10 μm. (2) Zn: 20-40%, Al: 2-8%, Si: 0
．． 2% to 2%, Mn: 0.1 to 5%, further contains Sn: 0.1 to 3%, and the remainder is Cu and unavoidable impurities (weight%). For transmissions made of a Cu-based alloy, which is made of a Cu-based alloy, and has an oxide film layer mainly made of aluminum oxide formed at required locations on the contact surface with the mating member with an average layer thickness of 0.1 to 10 μm. sync ring. (3) Zn: 20-40%, Al: 2-8%, Si: 0
．． 2-2%, Mn: 0.1-5%, and further contains one or more of Ti, Zr, and Cr:
0.05 to 1.5%, and the rest is Cu and unavoidable impurities (weight%), and aluminum oxide is added to the required places on the contact surface with the mating member. A synchronizing ring for a transmission made of a Cu-based alloy, which is formed by forming an oxide film layer mainly composed of oxide film with an average layer thickness of 0.1 to 10 μm. (4) Zn: 20-40%, Al: 2-8%, Si: 0
．． 2% to 2%, Mn: 0.1 to 5%, further Sn: 0.1 to 3%, and one or more of Ti, Zr, and Cr:
0.05 to 1.5%, and the rest is Cu and unavoidable impurities (weight%), and aluminum oxide is added to the required places on the contact surface with the mating member. A synchronizing ring for a transmission made of a Cu-based alloy, which is formed by forming an oxide film layer mainly composed of oxide film with an average layer thickness of 0.1 to 10 μm.