JPS61270560A - Gear fixing structure - Google Patents

Abstract

PURPOSE:To reduce the number of parts by extending the arm section from the end section of gear along the outercircumference of shaft while integrally forming a fixed projection on the pressure contacting face at the underside of arm section then fitting said projection into a hole made in the outercircumference of shaft. CONSTITUTION:The speed meter drive gear 5 has an arm section 6 extending continuously from the gear body 16 while having an arched arm 10 separated by the cuttings 7, 8 and a fixed projection 12 is formed integrally at the inside of the tip of arm 10. Said projection 12 is fitted in a hole 20 made in the outercircumference of main shaft 3. Consequently, the fixing structure can be formed only with the fitting hole at the shaft side and a gear without requiring special parts such as a stopper ring, steel ball, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gear fixing structure used in a gear mechanism of a speedometer drive device such as an automobile transmission.

(Prior Art) Conventionally, in an automobile speedometer drive device that displays speed by rotating a speedometer wire cable,
j ~ Main shift V 1 for the drive wheel of the lance transmission
The speedometer drive gear is fixed coaxially to the drive gear, and the speedometer drive gear is engaged from a direction perpendicular to the speedometer drive gear, and the speedometer wire cable connected to the driven gear is rotated and the speed is displayed. I have to.

By the way, conventionally, as a fixing structure of the speedometer drive gear to the main shaft, a snap ring is fitted to the drive gear fitted into the slate shaft portion of the main shaft to regulate the position in the axial direction, and the gear and shirt are fixed. Rotation is prevented by interposing a steel ball between 1 and 1.

(Problem to be solved by the invention) However, in the conventional gear fixing structure in which the steel ball is prevented from rotating, in addition to the fitting hole in which approximately half of the steel ball is fitted in the shaft side, , it is necessary to form and cover a small fitting groove with a depth equivalent to approximately half of the steel ball in the axial direction of the inner circumference of the driven gear, and by forming this fitting groove, the driven gear The wall thickness of the shaft part had to be increased, and the snap ring and sujiru small part were required as separate parts, making the assembly process complicated.

(Means for Solving the Problems) The present invention has been developed in view of these conventional problems, and it is possible to improve the structure of gears and the mechanical structure without requiring separate parts.
To provide a gear fixing structure in which the gear can be fixed to the shaft part of the shaft 1 by knowing only the simple side 7JII I.

In order to achieve this object, the present invention includes an arm extending along the outer periphery of the shaft at the end of the gear, a fixing protrusion integrally formed on the pressing surface on the lower side of the arm, and the fixing protrusion. It is designed to fit into a fitting hole formed on the outer periphery of the shaft.

(Example) FIG. 1 is an explanatory diagram showing a sub-transmission for a four-wheel drive vehicle, partially in cross section, in which the gear fixing structure of the present invention is used.

First of all, to explain the structure, 1 is the 1 Herans transmission case, and the main drive shirts 1 and 2 that transmit the engine power are taken out from the front part, and the transmitted power from the main drive shaft 2 is transferred to the 1 Herans transmission case. The power is transmitted to the rear side by changing the gears of the transmission gear mechanism provided inside the case 1. In addition, the power from main drive shirts 1 and 2 is 4
When a shift operation is performed to select wheel drive, power is also transmitted to the front main shaft 71 (not shown).

Main shaft 3 is supported by bearing 4! - The main shaft 3 is rotatably supported on the transmission case 1 and is located outside the Petz ring 4.
A speedometer drive gear 5 is fixed to the shaft,
A speedometer driven gear 6 is meshed with the speedometer drive gear 5 in a direction perpendicular to the speedometer drive gear 5.

FIG. 2 is a perspective view of the speedometer drive gear 5 fixed to the speed shafts of the main ships P71-3 of FIG. 1, with the gear portion omitted.

In Fig. 2, speedometer drive gear 5 (jl
, has an arm portion 6 extending continuously from the main body (), the arm portion 6 has axial cuts 7 formed at two locations in the circumferential direction,
Following this cut 7, a cut 8 is formed in the axial circumferential direction, and a pair of arc-shaped arms 1 are separated by the cuts 7 and 8.
A fixing protrusion 12 is integrally formed inside the tip of the arm 10.

FIG. 3 shows a structure for fixing the gear to the shaft portion of the main shaft 3 to the straight 1 using the speedometer drive gear 5 having the structure shown in FIG. 2. The speedometer drive gear 5 has a shaft hole 14 inside. A gear portion 1 in which a speedometer driven gear 6 meshes with the outer side of a gear body 16 provided with the gear body 16.
8, and a pair of arms 10 having the structure shown in FIG. It is fitted into the matching hole 20.

Next, the operation of the above embodiment will be explained.

First, the speedometer drive gear 5 is assembled into the tooth width fixed portion of the main shaft 3 in the main shaft V]i to 3.
Insert the speedometer drive gear 5 by holding the shaft hole 14 with the arm 10 side behind the rear end, and at this time,
In order to enable the fixing protrusion 12 to be fitted onto the outer periphery of the main shaft 3, the arm 10 is deformed outward by the notches 7 and 8, and the arm 10 is fitted into the formed position of the fitting hole 20 of the main shaft 3 in the expanded state. can be put,
The speedometer drive gear 5 can be fixed to the rate shaft of the main shirt 1-3 by fitting it into the fixing protrusion 12 or the fitting hole 20 of the arm]0 as shown in Fig. 3. .

That is, in the mounted state of the speedometer drive gear 5 shown in FIG. 3, the centering of the speedometer drive gear 5 with respect to the main shaft 1
On the other hand, by fitting the fixing protrusion 12 formed on the arm 10 into the fitting hole 20 on the main shaft 3 side, the rotation of the speedometer drive gear 5 can be prevented and the movement in the axial direction can be prevented. 2r to regulate.

FIG. 4 is an explanatory diagram showing another embodiment of the present invention.
The outer periphery of the speedometer drive gear 5 and the speedometer drive gear 5 extend in the axial direction, and a fixing protrusion 24 is integrally formed on the lower pressing surface of the arm 22. It can be applied when the driving torque due to the meshing of the meter drab gear 6 is small, and since the structure of the arm part is simple, it can be manufactured at a relatively low cost.

Incidentally, since the speedometer drive gear 5 shown in FIG. 2 or 4 is made of heat-resistant synthetic resin IJ, it can be manufactured integrally including the arm portion by index molding.

Further, although the above embodiment takes as an example the fixing structure of a speedometer drive gear used in an auxiliary transmission for a four-wheel drive vehicle, the present invention is not limited to this, and the present invention is not limited to this. It can be applied as is to any suitable gear fixing structure that fixes a gear coaxially to the heel.

(Effects of the Invention) As explained above, according to the present invention, in the fixing structure of the gear fixed to the shaft part of the machine V71, The arm part extends in the axial direction, a fixing protrusion is integrally formed on the pressing surface on the lower side of the arm part, and the fixing protrusion is fitted into and covered with a fitting hole formed on the outer periphery of the shaft. (1) Separate parts such as spring rings and steel balls are required. (4) Fixed structure can be realized using only the structure of the fitting hole on the shaft side and the gear, reducing the number of parts and (1) , ease of assembly can be obtained.

In addition, centering is performed by fitting the shaft hole of the gear into the shaft, and rotation can be prevented and the position in the axial direction can be controlled by fitting the fixing protrusion formed on the arm part, so that the slate of the shirt 1~ The gear can be securely fixed without causing looseness in the shaft part.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a partial cross section of an auxiliary transmission for a four-wheel drive vehicle in which the gear fixing structure of the present invention is used, and Fig. 2 shows the structure of the speedometer drive gear used in the present invention, showing the gear part. 3 is an omitted perspective view, FIG. 3 is a sectional explanatory view showing one embodiment of the present invention using the speedometer drive gear of FIG. 2, and FIG. 4 is a diagram showing another embodiment of the present invention. Cross section M
(The park is closed. 1 Nidoran transmission case 2: Main drive shaft 3: Main shaft 4: Bearing 5 Nispeed meter drive gear 6: Arm portion 7.8: Notch 10.22: Arm 12.24: Fixed protrusion 14 : Shaft hole 16: Gear body -10~ 18: Gear part 20: ttX joint hole special N! [Applicant: Fuji Tetsu Co., Ltd. Patent attorney: Susumu Takeuchi Figure 8: Figure 4

Claims (1)

[Claims] In a structure for fixing a gear fixed to a straight shaft portion of a shaft, an arm portion extends in the axial direction along the outer periphery of the shaft portion at an end of the gear, and a pressing contact on the lower side of the arm is provided. A fixing structure for a gear, characterized in that a fixing protrusion is integrally formed on a surface, and the fixing protrusion is fitted into a fitting hole formed on the outer periphery of a shaft.