JP2583852Y2 - motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly, to a technique effective when applied to, for example, a motor for driving a plunger pump or the like.

[0002]

2. Description of the Related Art As shown in FIG. 2, for example, a motor 21 for driving a plunger pump or the like generally has a housing 22 formed by press molding and a rotary drive shaft 20 protruding from the housing 22 having an eccentric cam 23 or an eccentric cam 23. It has a structure having an eccentric portion such as an eccentric shaft (not shown).
Are fitted and connected.

[0003]

By the way, in the motor 21 as described above, in order to fit the pump main body 24 into the spigot portion 25 of the housing 22, the pump main body 24 must be assembled.
The outer diameter ΦA of the spigot portion 25 of the housing 22, the outer diameter ΦB of the cam bearing 26, and the eccentric amount C of the eccentric cam 23 or eccentric shaft (not shown) must have the following relationship.

ΦA> ΦB + 2C That is, when such a relational expression does not hold, the cam bearing 26 is mounted on the inner peripheral surface of the housing 22 of the pump body 24.
And the operation of the plunger 27 of the pump body 24 is hindered.

Here, the housing 22 of such a motor 21 is usually manufactured by press molding as described above.

For this reason, the spigot portion 2 of the housing 22
When the outer diameter ΦA of the bearing housing 5 is large, the inner diameter ΦD of the bearing housing 22a on the inner peripheral surface side of the spigot portion 25 also increases in proportion to the outer diameter ΦA. Is required.

On the other hand, when a bearing having a small outer diameter is used instead of such a bearing having a large outer diameter, a bush 28 is interposed between the inner peripheral surface of the bearing housing 22a and the outer peripheral surface of the bearing 27. The bearing 27 is moved to the bearing housing 22a.
Housed in

As described above, in order to accommodate the bearing in the bearing housing 22a in accordance with various differences in the outer diameter ΦA of the spigot portion 25, a bearing having an outer diameter corresponding to the outer diameter ΦA of the spigot portion 25 is required. There is a method of performing adjustment by using this method, but this adjustment method is costly. In particular, when a bearing having a large outer diameter is used, the cost increases due to the increase.

On the other hand, the adjustment method using the bush 28 increases the number of parts, complicates the manufacturing process, and increases the cost.

An object of the present invention is to provide a motor capable of reducing the number of parts, simplifying a manufacturing process, and reducing costs.

[0011]

According to the present invention, there is provided a motor having a press-molded housing and a rotary drive shaft protruding from the housing having an eccentric portion. A thickened spigot portion for reinforcement into which a predetermined actuator is fitted is formed, and a bearing housing for accommodating a bearing of the rotary drive shaft is formed on an inner peripheral surface side of the spigot portion. The part and the bearing are arranged at corresponding positions in the axial direction with respect to each other, and a step with a smaller diameter than the spigot part is formed on the outer end side of the spigot part. An inner diameter of the bearing housing is substantially equal to an outer diameter of the bearing, and the bearing is housed in the bearing housing.

[0012]

According to the motor structure of the present invention, even if the outer diameter of the spigot portion of the housing changes due to the change in the eccentricity of the rotary drive shaft, the outer end surface of the spigot portion of the housing has the spigot. The inner diameter of the bearing housing on the inner peripheral surface side of the spigot portion is made substantially the same diameter as the outer diameter of the bearing of the eccentric shaft or eccentric cam due to a step formed by press molding to a smaller diameter than the portion, and the bearing is placed inside the bearing housing. By adjusting the size of the bush, it is not necessary to adjust the size of the bearing by using various sizes of bearings, and it is possible to use a bearing having a smaller outer diameter. Therefore, the number of components can be reduced, the manufacturing process can be simplified, and the cost can be reduced.

[0013]

FIG. 1 is a sectional view showing a motor according to an embodiment of the present invention.

The motor 1 according to the present embodiment is applied to a motor for driving a plunger pump or the like. As shown in FIG. 1, an iron core around which a coil 3 is wound in a housing 2 manufactured by press molding. 4, rotary drive shaft 5, bearing 6 bearing this rotary drive shaft 5, bearing 1
5, a magnet 7, etc. are accommodated.

The rotary drive shaft 5 projects out of the housing 2, and the rotary drive shaft 5 has a cam bearing 9 and a balancer 1.
0 is fitted.

A plunger 12 of a pump body 11 (actuator) is in contact with the cam bearing 9, and the plunger 12 linearly reciprocates according to the rotation of the cam bearing 9, and a pressure generated by the linear reciprocation of the plunger 12. Thereby, a valve (not shown) of the pump body 11 is opened and closed.

On the other hand, in this embodiment, the housing 2
Is provided with a thickened spigot portion 13 for reinforcement formed by press molding at one end side, and a step 13A having a smaller diameter than the spigot portion 13 is also formed at the outer end side of the spigot portion 13 by press molding. ing. The inner diameter of the bearing housing 14 on the inner peripheral surface side of the spigot portion 13 is reduced by the step 13 </ b> A of the spigot portion 13.
The bearing 15 is housed in the bearing housing 14 with substantially the same outer diameter as that of the bearing 15.

The housing 11A of the pump body 11
Is fitted to the large-diameter portion on the base end side of the spigot portion 13 of the housing 2 so that the motor 1 and the pump body 11 are connected to each other.

Next, the operation of this embodiment will be described.

The motor 1 of this embodiment has the above-described structure.

In this case, according to the motor 1 of this embodiment, the step 1 formed on the outer end side of the spigot portion 13 of the housing 2 by press molding and having a smaller diameter than the spigot portion 13 is formed.
3A, the inner diameter of the bearing housing 14 on the inner peripheral surface side of the spigot portion 13 is made substantially the same as the inner diameter of the bearing 15 of the eccentric cam 8, and the bearing 15 is housed in the bearing housing 14. Adjustment with a large-sized bearing is not required, and a bearing with a smaller outer diameter can be used, so that cost can be reduced. Further, since the adjustment by the bush is not required, the number of parts can be reduced, the manufacturing process can be simplified, and the cost can be reduced.

Although the invention made by the present inventors has been specifically described based on the embodiments, the invention is not limited to the above-described embodiments and can be variously modified without departing from the gist thereof. Needless to say.

For example, in the above-described embodiment, the present invention is applied to a motor 1 for driving a plunger pump or the like, but in the present invention, the present invention can be applied to a motor for driving another actuator.

In the above embodiment, the eccentric cam is provided on the rotary drive shaft 5 (straight shaft). However, an eccentric shaft may be provided instead of the eccentric cam.

[0025]

[Effects of the Invention] (1) According to the structure of the motor of the present invention, the outer diameter of the reinforcing thick spigot provided at one end of the housing to be press-molded is smaller than the spigot. Due to the step formed, the inner diameter of the bearing housing on the inner peripheral surface side of the spigot portion is substantially the same as the outer diameter of the bearing of the rotary drive shaft, and the bearing is accommodated in the bearing housing. Are disposed at corresponding positions in the axial direction with respect to the bearing, and the bearing housing is sufficiently reinforced by the spigot portion against a load from the radial direction.

(2) The need for adjustment by bearings of various sizes is eliminated.

(3) Since a bearing having a smaller outer diameter can be used, the cost can be reduced.

(4) Further, since adjustment by a bush is not required, the number of parts can be reduced, the manufacturing process can be simplified, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a motor according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Housing 3 Coil 4 Iron core 5 Rotation drive shaft 6 Bearing 7 Magnet 8 Eccentric cam 9 Cam bearing 10 Balancer 11 Pump body 11A Housing 12 Plunger 13 Inner part 13A Step 14 Bearing housing 15 Bearing 20 Rotary drive shaft 21 Motor 22 Housing 22 Bearing housing 23 Eccentric cam 24 Pump body 25 Inlay part 26 Cam bearing 27 Bearing 28 Bush ΦA Outer diameter of inlay part ΦB Outer diameter of cam bearing ΦD Inner diameter of bearing housing C Eccentric amount of eccentric cam

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-35649 (JP, A) JP-A-61-176950 (JP, U) JP-A-48-59910 (JP, U) JP-A-52 156911 (JP, U) Actually open 57-53069 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 5/04 H02K 5/16 H02K 7/075 H02K 7/14

Claims (1)

(57) [Scope of request for utility model registration] 1. A press-molded housing and a motor in which a rotary drive shaft protruding from the housing has an eccentric portion, and a reinforcing meat in which a predetermined actuator is fitted to one end of the housing. Thick spigot
Is formed on the inner peripheral surface side of the spigot portion.
A bearing housing for accommodating the bearing of the rolling drive shaft is formed
The bearing and the bearing correspond to each other in the axial direction.
At the outer end of the spigot portion.
Than spigot portion is small diameter stepped formation, accommodates an outer diameter and being in the bearing is substantially the same diameter of an inner diameter the bearing of the bearing housing of the inner peripheral surface side of the socket portion by the step is within the bearing housing A motor characterized in that: