JPS596135A - Structure for positioning shaft - Google Patents

Abstract

PURPOSE:To secure the positioning of the shaft of a transmission, by providing a component of the transmission, except the shaft, with a mark showing the direction of the center line of a tapped hole in a shaft supporting the securing member looking in the axial direction of the shaft. CONSTITUTION:One end of a reverse idler gear shaft 3, whose other end is loosely fitted in the hole of a clutch housing, is formed as a shaft supporting and securing member 5. A clamping bolt 8 is screwed into the tapped hole 6 of the securing member 5 to fix the member on a transmission case 2. To cause the tapped hole 6 of the securing member 5 and the hole 7 of the transmission case 2 to coincide with each other at the time of the fixation of the member 5 on the case 2, a shifting fork 9 is provided with a mark 10 showing the direction of the tapped hole 6. In assembling the shaft 3, the center line of the tapped hole 6 is made coincident with the mark 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft positioning structure for screwing one end of a shaft of a vehicle transmission to a side surface of a transmission case via a fixing member.

In the conventional 11-berth idler gear shaft of this type of vehicle transmission, as shown in Figure 1, one end is loosely fitted into a hole formed in the clutch housing, and the other end is used as a shaft supporting and fixing member with a threaded hole. The shaft supporting and fixing member is screwed to the transmission case from the outside. However, in the conventional method, when assembling the reverse idler gear shaft, there was no means to indicate the direction of the center line of the screw hole in the shaft support and fixing member, so the reverse idler gear shaft was assembled afterward. It is not guaranteed that the holes in the transmission case are aligned on the same straight line, and the direction of the screw holes in the shaft support and fixing member cannot be corrected and may have to be reassembled, making work extremely difficult. It was bad.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a shaft positioning structure when a reverse idler gear shaft of a vehicle transmission is screwed and supported on the side surface of a transmission case via a shaft support fixing member. To achieve this objective, the shaft positioning structure of the present invention loosely fits one end of the shaft of a vehicle transmission into a hole provided in the clutch housing, and screws the other end to the side of the transmission case via a shaft support fixing member. In the supporting structure, when the shaft is assembled into the clutch housing, the center line direction of the screw hole provided in the shaft support fixing member is set in the transmission component other than the shaft whose relative position to the shaft does not change when viewed from the shaft axis direction. Marks are provided to accurately position the shaft and facilitate assembly.

Embodiments of the shaft positioning structure of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a longitudinal sectional view showing the shaft positioning structure of the present invention.

One end of the reverse idler gear shaft a is loosely fitted into the hole 4 of the clutch housing 1, and the other end is formed as the shaft supporting and fixing member 5). The shaft support fixing member 5 is fixed to the transmission case 2 by screwing a tightening bolt 8 from the outside of the transmission case 2 into a screw hole 6 provided at the other end of the shaft support IM fixing member 5 facing the transmission case 2. , both ends of the reverse idler gear shaft 8 are supported by the clutch housing 1 and the transmission case 2, respectively. At this time, in order to match the screw hole 6 of the shaft support fixing member 5 with the hole 7 provided in the transmission case 2, the direction of the screw hole 6 of the shaft support fixation member 5 is instructed to the shift fork 9 as shown in FIG. A mark 10 is provided to do so. When assembling the shaft 8, sometimes mark 1 when viewed from the direction of arrow B in Figure 2.
0 so that the center line of the screw hole 6 coincides with the center line of the screw hole 6. Furthermore, in order to facilitate alignment, a mark indicating the position of the center line of the shaft 8 may be provided on the head of the support member 5.

The shaft positioning structure of the present invention configured in this manner ensures the positioning of the shaft 8, which needs to have a certain directionality with respect to the transmission case, when assembling a reverse idler gear shaft. The shaft can be assembled in one go, and there is no need to repair the assembly, which greatly reduces the time required for assembly work.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing the shaft mounting structure to which the present invention is applied, Fig. 2 is a longitudinal sectional view showing the shaft positioning structure of the present invention, and Fig. 3 is the structure of the present invention shown in Fig. 2 in direction B. FIG. l...Clutch housing, 2 river transmission case, 8...Reverse idler gear shaft, 4
．．・, Hole (clutch housing side), 5... Shaft support fixing member, 6... Screw hole, 7... Hole (transmission case side), 8... Tightening bolt, 9...
Shift fork, 10 mountain mark. Figure 1

Claims (1)

[Scope of Claims] L A structure in which one end of a shaft of a vehicle transmission is loosely fitted into a hole provided in a clutch housing, and the other end is supported by screws on a side surface of a transmission case via a shaft support fixing member, the shaft indicates the center line direction of a screw hole provided in the shaft support fixing member in a component of the transmission other than the shaft whose relative position with respect to the shaft does not change when viewed from the shaft axial direction when assembled into the clutch housing. A shaft positioning structure characterized by the provision of marks. 2. The shaft positioning structure according to claim 1, wherein the component other than the shaft provided with the mark is a shift fork.