JPS5820935Y2 - Speedometer gear shift support structure - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a support structure for a gear shaft in a speedometer gear of an automobile.

Generally, a speedometer gear meshes with a drive gear on the output shaft of a transmission, and the shaft part is supported via a sleeve on a bearing boss of the transmission case, and one end of the shaft is connected via a cable. It is connected to the speedometer inside the vehicle.

However, in the above-mentioned support structure, since the sleeve and the bearing boss are in contact with each other, vibrations caused by torque fluctuations in the transmission and gear engagement are transmitted to the single-chamber instrument panel through the sleeve. There is a problem where the panel resonates and causes noise inside the vehicle.

The present invention was devised to address the above-mentioned problems. A cylindrical gap is formed between the sleeve and the bearing boss to isolate vibrations from the transmission, and both sides of this gap in the length direction are Two elastic rings are interposed to elastically support the sleeve to the bearing boss, while a retaining piece of the sleeve is fixed to the transmission case, and this retaining piece is attached to the bearing boss through a vibration absorber. By engaging the sleeve, vibrations from the transmission are prevented from being transmitted to the sleeve, and at the same time, the sleeve is stably and reliably supported by the bearing boss.

The details of the present invention will be explained below based on the embodiments shown in the drawings.

In the figure, 1 is a transmission case, and an output shaft 2 of the transmission is housed inside the case 1, and a bearing boss 3 having a bearing boss hole 30 is integrally formed on the side of the case 1. A sleeve 4 is supported by the bearing boss 3.

A speedometer gear shaft 7, which has a speedometer gear 6 fitted to its lower end that meshes with the drive gear 5 fitted to the output shaft 2, is inserted and supported in the sleeve 4, and is supported at the upper end of the gear shaft 7. An inner cable 8 is connected to a speedometer (not shown) attached to an instrument panel in the vehicle compartment, and an outer cable 9 having one end fixed to the sleeve 4 is connected to the outside of the cable 8. is fitted.

In the figure, 10 is lubricating oil loaded in the case 1.

However, in the present invention, in the above configuration, the sleeve 4
has an outer diameter smaller than the boss hole 30 of the bearing boss 3 to form a cylindrical gap 11 between the sleeve 4 and the bearing boss 3 that can isolate vibrations from the transmission;
Two elastic rings 12° 12 such as O-rings are interposed at both ends in the length direction of this gap 11, and the elastic rings 12
．． 12 allows the sleeve 4 to be elastically supported by the bearing boss 3.

Further, a retaining piece 1 of the sleeve is attached to the upper part of the case 1.
3 is fixed via a bolt 14, a vibration absorber 15 made of synthetic resin or the like is integrally fixed to the tip of the retaining piece 13, and the fixed portion of the absorber 15 is formed on the sleeve 4. By doing so, the vibration transmitted from the case 1 to the retaining piece 13 is not transmitted to the sleeve 4, and the vibration is not transmitted to the sleeve 4 from the bearing boss 3 of the sleeve 4. This is done to prevent it from coming off.

In the above configuration, the output shaft 20 rotation speed is transmitted to the gear shaft 7 via the gear 5.6, and this gear shaft 7
The signal is transmitted from the inner cable 8 to the speedometer.

At this time, in the past, since the sleeve 4 was supported in close contact with the bearing boss 3 of the case 1, vibrations from the case 1 were transmitted to the instrument panel in the passenger compartment via the sleeve 4 and the outer cable 9, etc. However, in the present invention, a cylindrical gap 11 is formed between the sleeve 4 and the bearing boss 3 to isolate vibrations from the transmission. , this gap 1
Two elastic rings 12 are interposed at both longitudinal ends of 1.
．． 12, the sleeve 4 is elastically supported by the bearing boss 3, and a vibration absorber 15 is fixed to the retaining piece 13 of the sleeve, and the retaining piece 13 is engaged with the sleeve 4 via the vibration absorber 15. Therefore, while the sleeve 4 is stably and reliably supported by the bearing boss 3, vibrations transmitted from the transmission to the case 1 are absorbed by the elastic rings 12, 12 and the vibration absorber 15, and the sleeve 4 It cannot be conveyed to the people.

As is clear from the above explanation, according to the present invention,
Since vibrations transmitted from the transmission to the transmission case are absorbed by the elastic ring and the vibration absorber and are not transmitted to the sleeve, there is no risk of noise being generated in the vehicle interior due to resonance of the instrument panel. However, the sleeve is reliably and stably supported by the bearing boss by the two elastic rings and the retaining piece.

In addition, since a gap is formed between the bearing boss and the sleeve, even if rust occurs between the two, the two will not become stuck together as in the past, and they can be easily disassembled, making inspection and repair work easier. Even though a gap is formed, two elastic rings are inserted in the gap, so rainwater etc. cannot enter the case through this gap, or the lubricant inside the case can be damaged. This prevents oil from leaking, and furthermore, since the sleeve supporting the speedometer gear shaft is elastically supported by the elastic ring, the precision of each gear provided on the gear shaft and output shaft is slightly poor. Make sure that both gears are engaged even if
The rotation speed of the output shaft can be accurately transmitted to the gear shaft.

[Brief explanation of drawings]

The drawing is a sectional view showing a support structure for a speedometer gear shaft according to the present invention. 1... Case, 2... Output shaft, 3...
...Bearing boss, 4...Sleeve, 7...
...Gear shaft, 11...Gap, 12...
...Elastic ring.

Claims (1)

[Scope of utility model registration request] In a speedometer gear shaft support structure in which a speedometer gear shaft, one end of which is connected to a speedometer via a cable, is supported via a sleeve on a bearing boss of a transmission case, the outer diameter of the sleeve is smaller than the bearing boss hole. A cylindrical gap capable of isolating vibrations from the transmission is formed between the sleeve and the bearing boss, two elastic rings are interposed at both lengthwise ends of the gap, and The sleeve is elastically supported on the bearing boss by an elastic ring, while a retaining piece of the sleeve is fixed to the transmission case, and the retaining piece is engaged with the sleeve via a vibration absorber. Support structure for speedometer gear shaft.