JP2674588B2 - Synchronous ring for transmission made of Cu alloy - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change made of a Cu-based alloy, which is particularly excellent in initial conformability of a contact surface with a mating member and exhibits excellent performance over a long period of time. The present invention relates to a device synchronization ring. [0002] Conventionally, generally, a synchronous ring for a transmission has
As illustrated in a perspective view in FIG. 1, the inner surface 1 serves as a contact surface with a rotating taper cone, and a taper cone as a mating member contacts the contact surface intermittently under a high surface pressure, and on the other hand, on the outer peripheral surface. Is formed with a key groove 3 into which a key is fitted, and furthermore, the chamfer 2 provided at predetermined intervals along the outer edge thereof has a function of engaging with the chamfer of the hub sleeve which is also the mating member, so that strength and wear resistance are improved. , And the compatibility with the mating member are required, and therefore, high-strength brass having these characteristics is often used in the production thereof. In addition, there is another type of the synchronous ring having a so-called pin type in which a screw is provided on an outer peripheral side and friction occurs with a tapered cone as a mating member on the outer peripheral side. However, with the recent increase in the output of the transmission, the above-mentioned conventional high-strength brass synchronous ring has a chamfer especially for the above-mentioned tapered cone and key and hub sleeve. Because the contact surface with at least one of the mating members receives a high surface pressure,
The initial conformability is reduced, and as a result, abnormal wear due to brilliant surface wear and adhesion wear occurs frequently, which causes a shortened service life. [0004] Therefore, the present inventors have proposed:
As a result of conducting research to solve the above-mentioned problems of the conventional high-strength brass transmission synchronous ring, Zn: 20 to 40% by weight (hereinafter,% indicates weight%), A
1: 2 to 8%, Si: 0.2 to 2%, Co: 0.
1 to 6%, Ti and / or Zr: 0.05 to 0.5
%, And if necessary, Mn: 0.1 to 5
%, And the remainder is made of a Cu-based alloy having a composition of Cu and unavoidable impurities, and at least a required portion of a contact surface with a mating member, that is, a tapered cone or a key, and at least a chamfer of a hub sleeve. An average layer thickness of 10 to 3 is applied to the contact surface with one of the mating members by shot blasting or pressing using a cold press.
The synchronous ring for a transmission made of a Cu alloy having a work hardened layer of 00 μm shows excellent initial conformability even under conditions of use under a high surface pressure accompanying an increase in the output of the transmission. The research results show that the occurrence of wear can be suppressed. The present invention has been made based on the results of the above research, and explains the reasons for limiting the component composition and the average thickness of the work hardened layer as described above. (A) Zn and Al These components are components that determine the base structure of the alloy, improve the wear resistance of the base, provide the necessary strength and toughness to the synchronous ring, and further increase the fatigue strength. Excellent in proof stress, indispensable for forming a work hardened layer on the ring surface that prevents adhesion (seizure) due to plastic flow due to local high-temperature heating, thereby preventing initial abnormal wear and improving initial conformability Component, the content of which is Zn: 20
% And Al: less than 2%, not only the above characteristics cannot be ensured, but also it becomes difficult to form a work hardened layer having the above characteristics, while the content is Zn: 40% and If the Al content exceeds 8%, the toughness is reduced.
0%, desirably 25 to 35%, Al: 2 to 8%, desirably 3 to 6%. (B) Si and Co Si and Co form an intermetallic compound finely dispersed in the matrix to improve the strength and wear resistance of the ring, and this intermetallic compound is present in the work-hardened layer. Has the effect of improving the seizure resistance, but if the contents are respectively less than Si: 0.2% and Co: less than 0.1%, the desired effect cannot be obtained. , Its content is S
In the case of i, if the content exceeds 2%, slag is often generated during melting, and in the case of Co, the toughness decreases if it exceeds 6%.
%, Preferably 0.5 to 1.5%, and a Co content of 0.
It was set to 1 to 6%, preferably 0.5 to 3.0%. (C) Ti and Zr These components have the effect of refining the structure and improving the strength and toughness, but if the content is less than 0.05%, the desired improving effect on the above-mentioned effects is obtained. On the other hand, even if the content exceeds 0.5%, no further improvement effect is exhibited by the above-mentioned action.
It was set to 0.5%, preferably 0.1 to 0.3%. (D) Mn The Mn component forms a solid solution in the base material to improve the strength, makes the intermetallic compound finer, and also forms an intermetallic compound by itself bonding with Si. Since it has the effect of further improving the wear resistance of the hardened layer, it is contained as necessary, but if the content is less than 0.1%, the desired effect cannot be obtained for the above-mentioned action, while the content is If it exceeds 5%, slag is often generated during melting, so the content is set to 0.1 to 5, preferably 0.2 to 3%. (E) Work hardened layer Work hardened layer Can be formed by shot blasting or sand blasting as described above, and further, if it is provided only on the taper cone friction surface of the ring, for example, by pressing with a cold press using a steel die, Formed as The work-hardened layer has excellent fatigue strength and proof stress in combination with the composition of the work-hardened layer, so it exhibits excellent plastic flow resistance against localized high temperature heating, and as a result, baking Since the initial abnormal wear is prevented and excellent initial conformability comes to be exhibited due to the suppression, the desired effect cannot be obtained when the average layer thickness is less than 10 μm, while the average layer thickness exceeding 300 μm is obtained. Since the excellent effect cannot be secured, the average layer thickness is 10 to 300 μm, preferably 30.
˜100 μm. DETAILED DESCRIPTION OF THE INVENTION Next, the synchronizing ring of the present invention will be described in detail with reference to embodiments. Using an ordinary high-frequency furnace, C having the component compositions shown in Tables 1 and 2, respectively.
Prepare a u-based alloy melt, mold casting, diameter: 200mm
A billet of φ × length: 400 mm is formed, and this billet is extruded into a round bar having a diameter of 60 mmφ by an extrusion press, and the round bar is cut into a predetermined length.
Hot forging is performed at a temperature within a range of 0 to 750 ° C., further cutting is performed, and subsequently, in air, a diameter: 10 to 3
Shot blasting was performed using mixed beads of SiC beads and steel beads of 00 μm (SiC: 50% by volume), and a work-hardened layer having an average layer thickness shown in Tables 1 and 2 was also formed on the entire surface. Inner diameter by forming: 5
Inventive synchronizing rings 1 to 16 and comparative synchronizing rings 1 to 7 each having a size of 8 mmφ × thickness: 4 mm and a chamfer number of 36 were manufactured. In the comparative synchronizing rings 1 to 7, any one of the component composition and the average layer thickness of the work-hardened layer (marked with * in Table 2) is out of the range of the present invention. Next, with respect to the various synchronizing rings obtained as a result, the rotational speed of the tapered cone, which is a mating member, is 1200 rpm.
, Pressing load: 65 kg, Oil: No. 80 mission oil, Oil temperature: 80 ° C, Taper cone operation: 20000 times with synchronization time of 0.3 to 0.35 seconds, Synchro durability test under the conditions Depression amount (wear amount), presence or absence of adhesive wear, initial (50
(Up to 0 times) and the friction coefficient in the latter period (stable period) were measured and observed, respectively, and the rotational speed of the tapered cone, which is the other member, was 2000 rpm.
, Pressing load: 120kg, Oil: No.80 mission oil, Oil temperature: 70 ° C, Taper cone operation: 5000 times with synchronization time of 0.25 to 0.3 seconds, Synchro durability test was performed under the conditions of The presence or absence of cracks and deformation was observed. These results are shown in Table 3,
The results are shown in Table 4. [Table 1] [Table 2] [Table 3] [Table 4] From the results shown in Tables 1 to 4, all of the synchronizing rings 1 to 16 of the present invention have high strength and high toughness, and they are practically used in spite of the high surface pressure condition. It has excellent conformability in the initial stage, does not cause abnormal wear, and exhibits excellent performance. On the other hand, as can be seen in the comparative synchronizing rings 1 to 7, any one of the constitutional requirements of the present invention can be used. Clearly, if out of the range, at least one of the above properties becomes inferior. It is needless to say that a similar result can be obtained with a pin type synchronous ring. As mentioned above, C of the present invention
The u-alloy transmission synchronizing ring has high strength and high toughness, is particularly excellent in initial conformability, and even when it is put to practical use under the severe conditions associated with higher output of the transmission, bright surface wear and coagulation Abnormal wear such as wearing wear does not occur, and excellent performance is exhibited over a long period of time.

[Brief description of the drawings] FIG. 1 is a perspective view illustrating a synchronous ring for a transmission. 1 Taper cone friction surface (inner surface) 2 Chanfa 3 Keyway

Claims (1)

(57) [Claims] By weight%, Zn: 20-40%, Al: 2-8%, Si: 0.2-2%, Co: 0.1-6%, Ti and / or Zr: 0.05-0.5%. C having a composition containing, and the balance being Cu and inevitable impurities.
A Cu-based alloy synchronizing ring for a transmission, which is made of a u-based alloy and has a work-hardened layer formed at a required position on a contact surface with a mating member with an average layer thickness of 10 to 300 μm. 2. By weight%, Zn: 20-40%, Al: 2-8%, Si: 0.2-2%, Co: 0.1-6%, Ti and / or Zr: 0.05-0.5%. And Mn: 0.1 to 5%, and the remainder is composed of a Cu-based alloy having a composition of Cu and inevitable impurities, and at a required position on the contact surface with the mating member, Work hardened layer 10
A Cu-based alloy transmission synchronizing ring formed with an average layer thickness of 300 μm.