JPS61288061A - Carburizing and hardening method for spline mating member - Google Patents

Abstract

PURPOSE:To control the mating failure of plural of plural members in case of carburizing and hardening plural members mated via a spline join by making the above-mentioned members a state set in a prescribed mating relation. CONSTITUTION:For example a coupling sleeve 1 and a hub 2 of a transmission for a vehicle are mated via the spline parts 1a, 2a and supported by mating a knife-edge engaging bar 3. The sleeve 1 and the hub 2 are carburized and hardened in this state. Thereby the outside diameter part of the hub 2 is positioned in the inside diameter part of the sleeve 1 because both are made to one body in the hardened state. Therefore the lubrication of quenching oil for the spline parts 1a, 2a is hindered in some degrees in a cooling process and the hardening is made loose. Simultaneously since the quenching oil of the inside diameter part of the sleeve 1 is moderately risen in temp. in the cooled state because the hub 2 is heated, the warpage based on the hardening strain and the generation of an ellipse are decreased. Thereby the mating failure of the sleeve 1 and the hub 2 is controlled and the swing of a fork groove 1b can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for connecting a plurality of members fitted via spline connections, for example, a compression sleeve and a hub of a vehicle transmission, to a predetermined fitting interval. The present invention relates to a method for carburizing and quenching a spline fitting member, which prevents poor fitting by carburizing and quenching the spline fitting member in a set state.

[Conventional technology]

Carburizing and quenching of the compression sleeve and hub of a conventional vehicle transmission is carried out, for example, by the method shown in FIG. 2 ((), (El)).

FIG. 2(A) shows a method of carburizing and quenching the coupling sleeve 1. That is, gold 1i15 is spread on the bottom of the basket 4, and the coupling sleeve 1 is placed thereon, and then a wire mesh 5 is spread on top of the gold 1i15 and the coupling sleeve 1 is placed thereon, and then carburizing and quenching is performed.

FIG. 2 (II) shows a method of carburizing and quenching the hub 2. The carburizing and quenching is performed by hanging the hub 2 on a bar 7 at intervals with spacers 6.

The coupling sleeve 1 and hub 2, which have been hardened in this manner, are set by fitting the spline parts 1a and 2a.

[Problem that the invention seeks to solve]

However, according to the conventional carburizing and quenching method for the coupling sleeve and hub of a vehicle transmission, if the entire coupling sleeve 1 is carburized and quenched due to its shape, warping and elliptical quenching distortion will occur, so the coupling There is an inconvenience that the sleeve and hub may not fit properly.

[Means and effects for solving the problems] The present invention has been made in view of the above problems, and is intended to suppress poor fitting of a plurality of spline-coupled members and prevent fork groove runout. To provide a method for carburizing and quenching a spline fitting member, in which a plurality of members are set at a predetermined fitting distance and carburizing and quenching is performed in a state where lubrication of quenching oil to the fitting portion is suppressed.

〔Example〕

Hereinafter, the method for carburizing and quenching a spline fitting member of the present invention will be explained in detail.

FIG. 1 shows an embodiment of the present invention, in which a coupling sleeve 1 and a hub 2 have a spline portion 1a.

2a (the recess 1b of the coupling sleeve 1 indicates a fork groove), and the sword support supports the coupling sleeve 1 and the hub 2 into which the bar 3 is fitted. Although this embodiment shows the case where the sword is hung, the sword is not limited to this and may be laid flat. As shown in Fig. 1, since carburizing and quenching is performed with the coupling sleeve 1 and the hub 2 fitted together via the spline parts 1a and 2a, the coupling sleeve 1 and the hub 2 are integrally formed in the quenched state. Coupling sleeve 1
The outer diameter of the hub 2 is located at the inner diameter of the spline parts 1a and 2a, so that the lubrication of the quenching oil to the spline parts 1a and 2a is inhibited to some extent during the cooling process, and the quenching becomes loose.

At the same time, since the hub 2 is also heated, the temperature of the quenching oil on the inner diameter portion of the coupling sleeve 1 rises considerably when it is cooled, so that the occurrence of warpage and ellipse due to quenching distortion is reduced. This is because the temperature of the quenching oil should be higher to reduce the occurrence of warpage and ellipses due to quenching distortion.
This is also based on the fact that the smaller the quenching oil, the better the lubrication.

〔Effect of the invention〕

As described above, according to the carburizing and quenching method for spline fitting members of the present invention, a plurality of members are set in a predetermined fitting relationship, and carburizing and quenching is performed in a state in which lubrication of quenching oil to the fitting portions is suppressed. At the same time, since the temperature drop of the quenching oil in the fitting portion is suppressed, the occurrence of warpage and ellipse due to quenching distortion can be suppressed. Thereby, it is possible to suppress poor fitting of the plurality of spline-coupled members, and prevent fork groove vibration and the like.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. Figure 2 (()
, (0) is an explanatory diagram showing a conventional carburizing and quenching method for a coupling sleeve and a hub of a vehicle transmission. Explanation of symbols 1 -------・Coupling sleeve, l a
--- Spline part, 1 b -------1・Poor coolant 2 --- Hub, 2 a ---
------1. Spline part, 3-.- Sword rest is bar, 4-
−−−−−−−Basket, 5−・−1111・Wire mesh,
6 --------1 Spacer, 7-...
・The sword rack is a bar.

Claims (1)

[Claims] A method for carburizing and quenching a plurality of members fitted together via a spline connection, characterized in that carburizing and quenching is performed with the plurality of members set in a predetermined fitting relationship. Carburizing and quenching method for fitting parts.