JPH0134545Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a speedometer mounting structure for a vehicle electric motor.

[Technical background of the invention]

Conventionally, a speedometer that is attached to a vehicle main electric motor and measures the rotational speed of the motor shaft in a non-contact manner is attached to the electric motor in the following manner. That is, in FIGS. 1 and 2, 1 is a vehicle main electric motor, and 2 is a pinion gear 4 fixed to the motor shaft 3.
This is a non-contact speedometer (for example, a tachometer generator) that measures the rotational speed of the motor shaft 3 by detecting the approach of the tips of the teeth using a magnetic pole piece 2a. A support frame 6 that supports this speedometer is fixed to the end frame 1a of the electric motor 1 with bolts 5. It is attached to electric motor 1. 3 and 4 show the mounting portion of the speedometer 2, in which the motor frame 1a is formed with a catch 7 facing the outer circumferential side of the motor, and the speedometer support frame 6 is provided with a catch 7. A seat abutting surface 8 is formed to face the seat. And the bolt 5
is a screw hole 1 provided in the motor frame 1a that is inserted into the elongated hole 9 provided in the speedometer support frame 6.
0, and the speedometer support frame 6 inserts a spacer 11 between the seat 7 and the seat contact surface 8 as necessary to connect the magnetic pole piece 2a of the speedometer 2 and the pinion gear 4. After adjusting the gap G, bolt 5
It is fixed to the motor frame 1a by tightening. In addition, in FIG. 1, 12 is a reduction gear that meshes with the pinion gear 4.

[Problems with background technology]

However, in the above-mentioned conventional speedometer mounting structure, the support frame 6 of the speedometer 2 is attached directly or via the spacer 11 to the seat 7 of the motor frame 1a.
Since the speedometer 2 is in contact with the pinion gear 4 side, the gap G between the magnetic pole piece 2a and the pinion gear 4 does not become smaller due to the positional shift of the speedometer 2 approaching the pinion gear 4 side. However, the displacement of the speedometer 2 in the direction away from the pinion gear 4 is only prevented by the pressing force between the speedometer support frame 6 and the motor frame 1a. In order to be
The speedometer 2 may be damaged due to vibrations and shocks caused by the running of the vehicle.
is shifted away from the pinion gear 4, and the gap G between the magnetic pole piece 2a and the pinion gear 4 increases,
As a result, the output voltage of the speedometer 2 may drop, making it impossible to measure the speed. Moreover,
In the conventional speedometer mounting structure described above, when bolting the speedometer support frame 6 to the motor frame 1a, the speedometer support frame 6 shifts away from the catch seat 7 as the bolt 5 rotates, and the speedometer once adjusted Because the position of 2 may be out of order,
The bolts 5 must be tightened while pressing the speedometer support frame 6 against the seat 7, which makes the work of installing the speedometer 2 troublesome, and even if this method is used, the speedometer support frame 6
There is no guarantee that it will be firmly pressed against the catch seat 7.
There was a problem in that it was necessary to check the gap G between the magnetic pole piece 2a and the pinion gear 4 using a gauge after installing the speedometer.

[Purpose of invention]

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to completely prevent the speedometer from shifting due to vibrations and shocks, and to improve the relationship between the speedometer's magnetic pole piece and pinion gear. A speedometer installation for a vehicle electric motor that allows the gap to be maintained correctly at all times, makes speedometer installation easy, and eliminates the need to check the gap between the magnetic pole piece and pinion gear after the speedometer is installed. It's about providing structure.

[Summary of the idea]

That is, in the present invention, a speedometer mounting groove is provided in the motor frame in a direction that intersects the normal line passing through the center of the motor shaft, and one groove wall surface of this speedometer mounting groove is formed into a receiving seat parallel to the axis of the motor shaft. The other groove wall surface is inclined toward the axial direction of the motor shaft, and the speedometer support frame has a long hole having the same cross-sectional shape as the speedometer mounting groove and parallel to the normal line. A groove fitting part is provided, the groove fitting part is fitted into the speedometer mounting groove, and the groove fitting part is adjusted to the speed by the tightening force of the fixing bolt screwed into the bottom of the speedometer mounting groove through the elongated hole. The groove fitting portion is pressed against the inclined wall surface of the gauge mounting groove, and the groove fitting portion is pressed and fixed to the seat side by the slope guiding action of the inclined wall surface.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

5 to 7 show a first embodiment of the present invention, in which the end frame 1a of the electric motor 1 is provided with a A speedometer mounting groove 13 is provided horizontally in a direction that intersects with the normal line. The groove wall surface is an inclined wall surface 1 that is inclined toward the axial direction of the motor shaft 3 and has an appropriate inclination angle θ.
It has become 3b. Further, in the support frame 6 of the speedometer 2, on the side facing the motor frame 1a, the speedometer mounting groove 13 has an upper surface inclined at the same angle as the inclined wall surface 13b and a lower surface set as a horizontal surface.
A groove fitting part 6a having the same cross-sectional shape as the one shown in FIG.
is provided parallel to the normal line. Then, the speedometer support frame 6 has its groove fitting portion 6a fitted into the speedometer mounting groove 13 of the motor frame 1a, and if necessary, the groove fitting portion 6a of the speedometer mounting groove 13 and the groove fitting portion Speedometer 2 between the bottom surface of 6a
With the spacer 11 inserted to adjust the gap G between the magnetic pole piece 2a and the pinion gear 4 fixed to the motor shaft 3, the fixing bolt 5 is screwed into the threaded hole 10 at the bottom of the speedometer mounting groove through the elongated hole 9. It is fixed to the motor frame 1a by tightening.

Therefore, in this speedometer mounting structure, when the fixing bolt 5 is tightened when mounting the speedometer 2, the groove fitting portion 6a of the speedometer support frame 6 is tightened and the speedometer mounting groove 13
While being pushed in, it is pressed against the inclined wall surface 13b of this speedometer mounting groove 13, and further this inclined wall surface 1
3b, it is pressed toward the seat 13a by the slope guiding action of the inclined wall surface 13b. Therefore, according to this speedometer mounting structure, when tightening the bolt 5, even if the speedometer support frame 6 is not pressed against the seat 13a, the groove fitting portion 6a will move against the seat as the bolt 5 rotates. It does not float up from the seat 13a, so the speedometer 2 can be easily installed, and the groove fitting part 6a can be reliably brought into close contact with the seat 13a either directly or through the spacer 11. Therefore, it is reliable, and there is no need to check the gap G between the magnetic pole piece 2a and the pinion gear 4 using a gauge after the speedometer 2 is installed. In this speedometer mounting structure, since the groove fitting portion 6a of the speedometer support frame 6 is held between the inclined wall surface 13b of the speedometer mounting groove 13 and the wall surface serving as the seat 13a from above and below, vibrations and Since the speedometer 2 does not shift vertically due to impact, and horizontal shift of the speedometer 2 is also prevented by the bolt 5 as in the conventional case, the gap between the magnetic pole piece 2a of the speedometer 2 and the pinion gear 4 is reduced. G can always be maintained correctly. In addition, in this speedometer mounting structure, when the spacer 11 is inserted between the catch seat 13a and the groove fitting part 6a, the speedometer 2
As shown by the two-dot chain line in the figure, the distance l (l=
T/tanθ), but this axial displacement has almost no effect on the output voltage of speedometer 2, so
This axial displacement does not pose a problem.

In the above embodiment, the upper groove wall surface of the speedometer mounting groove 13 is an inclined wall surface 13b, but the speedometer mounting groove 13 has an upper groove wall surface parallel to the axis of the motor shaft 3, as shown in FIG. The groove fitting portion 6a of the speedometer support frame 6 may be shaped as a catch 13a with an inclined wall surface 13b as the lower groove wall surface.
Since it is pressed toward the side 3a, the same effect as in the first embodiment can be obtained. Further, in the above embodiment, the speedometer mounting groove 13 is provided horizontally, but the speedometer mounting groove 13 and the groove fitting portion 6a are centered on the motor shaft center as shown in FIGS. 9 and 10. It may be formed in an arc shape. Further, in the above embodiment, the speedometer 2 is installed above the pinion gear 4, but the present invention can also be applied to a case where the speedometer 2 is installed to the side or below the pinion gear 4.

[Effect of idea]

Since the present invention has the above structure,
It completely prevents the speedometer from shifting due to vibration or shock, and the gap between the speedometer's magnetic pole piece and pinion gear can always be maintained correctly, and the speedometer can be easily installed. Furthermore, since the speedometer installation accuracy is reliable, it is not necessary to check the gap between the magnetic pole piece and the pinion gear after the speedometer is installed.

[Brief explanation of the drawing]

Figures 1 to 4 show the conventional speedometer mounting structure. Figure 1 is a front view of the entire electric motor, Figure 2 is a side view of the electric motor taken longitudinally, and Figures 3 and 4 are speedometer mounting structures. FIG. 3 is a longitudinal sectional side view of the mounting portion and a view of the speedometer support frame viewed from the electric motor side. Figures 5 to 7 show the first embodiment of the present invention, in which Figure 5 is a vertical side view of the electric motor, and Figures 6 and 7 are vertical side views of the speedometer mounting section. FIG. 3 is a diagram of the speedometer support frame viewed from the electric motor side. FIG. 8 is a longitudinal side view of a motor showing a second embodiment of the present invention. 9 and 10 are a longitudinal sectional side view of a speedometer mounting part and a view of the speedometer support frame viewed from the electric motor side, showing a third embodiment of the present invention. 1...Electric motor, 1a...Motor frame, 2...
...Speedometer, 2a...Magnetic pole piece, 3...Motor shaft, 4
... Pinion gear, 5 ... Fixing bolt, 6 ... Speedometer support frame, 6a ... Groove fitting part, 9 ... Long hole, 11 ... Spacer, 13 ... Speedometer mounting groove,
13a... catch seat, 13b... inclined wall surface.

Claims (1)

[Scope of utility model registration request] Mounting structure of a non-contact speedometer that is attached to the end face of a vehicle electric motor and measures the rotational speed of the motor shaft by detecting the approach of the tips of the pinion gear teeth using a magnetic pole piece that closely opposes the pinion gear fixed to the motor shaft. In this method, a speedometer mounting groove is provided in the motor frame in a direction that intersects the normal line passing through the center of the motor shaft, and one groove wall surface of this speedometer mounting groove is a catch parallel to the axis of the motor shaft, and the other The groove wall surface is inclined toward the axial direction of the motor shaft, and the support frame of the speedometer has a groove fitting portion having a long hole having the same cross-sectional shape as the speedometer mounting groove and parallel to the normal line. The groove fitting part is fitted into the speedometer mounting groove, and the groove fitting part is fitted into the speedometer mounting groove by the tightening force of the fixing bolt screwed into the bottom of the speedometer mounting groove through the elongated hole. A speedometer mounting structure for a vehicle electric motor, characterized in that the speedometer is pressed against an inclined wall surface, and the groove fitting portion is pressed and fixed to the seat side by the inclined wall surface.