JPS6234665Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a device for assembling steel balls together with grease.

(b) Prior Art A combination of steel balls and grease is often used in mechanical devices as a simple rolling support means. Of course, attempts have also been made to automate the assembly of the brakes, and as an example, Publication No. 14970 of 1983 mentions a bicycle hanger one in which multiple steel balls are arranged in a ring shape using a grease injector as a guide. A device is described that allows grease to be applied to the steel ball array by discharging grease from a grease injector after completion of the process. In this example, multiple steel balls are arranged in a ring like a normal ball bearing, but steel balls can also be used in the following ways.
In other words, what is shown in Fig. 1 is the rotor support structure of a small hard-shaft electric motor that is incorporated into a juicer mixer.
Here, a conical recess is formed by center massaging the end face of the rotor shaft 1, one steel ball 3 is inserted into the recess, and the bearing metal 6 placed on the bearing holding part 5 of the motor case 4 is inserted. The steel balls 3 are brought into contact to support the thrust load of the rotor. 7 is a bearing that supports the radial load of the shaft 1. Grease 8 is applied to the recess 2 to lubricate the steel ball 3. The problem here is which of the steel balls 3 and the grease 8 should be inserted into the recess 2 first during assembly, but considering the convenience of handling in the later assembly process, It is desirable to apply the grease 8 to the bottom of the recess 2 first, press the steel ball 3, and hold the steel ball 3 with the adhesive force of the grease 8. If such a task is to be performed using a device such as that described in Publication of Utility Model Publication No. 46-14970, (i) bringing the grease injector close to the recess, (ii) discharging the grease, and (iii) discharging the discharged grease and the grease injector. cut ties with

(iv) Moving the grease injector away from the recess (v) Bringing the steel ball chute closer to the recess (vi) Dropping the steel ball (vii) Removing the steel ball chute must be completed in a short work tact. cannot be carried out. Furthermore, since the steel balls are dropped by gravity, the recesses must be oriented upwards, which reduces the degree of freedom in configuring the production line.

(c) Problems to be solved by the invention The invention aims to provide a simple device that can quickly press grease and a single steel ball into the recess of a member to be assembled. . Furthermore, this invention
The present invention aims to provide a device that does not impose any restrictions on the holding posture of the assembled member.

(d) Means for solving the problem The device of the present invention has a grease injection path opened inside the discharge hole facing the recess of the member to be assembled, and a steel ball guide path deeper than this. Furthermore, an ejector rod is disposed in the discharge hole.

(E) Function When the steel ball supplied from the steel ball guide path is pushed by the ejector rod, this steel ball acts as a piston and absorbs the grease supplied from the grease injection path onto its front surface. In this way, the grease is first pushed out, and then the steel balls are pushed out from the discharge hole in that order, and are adhered to the recesses of the parts to be assembled.

(F) Example An example of the present invention will be described with reference to Figs. 2 and 3. Reference numeral 9 denotes the rotor of a small rigid shaft electric motor, which is shown as an example of the member to be mounted, and has a shaft 1 and a conical recess 2 on its end face. Reference numeral 10 denotes a carrier for moving the rotor 9 from one processing station to another. The rotor 9 is supported with the shaft 1 horizontal. Reference numeral 11 denotes an installation device for the steel balls 3, and is in the form of a nozzle 13 protruding from the side of a base 12. The nozzle 13 and base 12 are provided with:
A horizontal discharge hole 14 is provided in succession, and a grease injection passage 15 and a steel ball guide passage 16 are connected to the horizontal discharge hole 14. The grease injection passage 15 is connected to the nozzle 1.
The steel ball guide passage 16 is connected to an annular groove 17 provided around the periphery of the grease 13, and communicates with the discharge hole 14 through a plurality of small holes 18 provided at the bottom of the annular groove 17. The steel ball guide passage 16 opens to the ceiling of the discharge hole 14 at a location deeper than the grease injection passage 15. The grease injection passage 15 and the steel ball guide passage 1
An injection pipe 19 from a grease dispenser (not shown) and a guide pipe 20 from a steel ball feeder (not shown) are connected to the nozzle 6.
It is an ejector rod that goes into the cylinder and is driven by a pneumatic cylinder or the like.

The assembly device 11 operates as follows. First, the second
As shown in the figure, the end surface of the rotor shaft 1 is placed opposite the nozzle 13, an appropriate amount of grease 8 is injected into the nozzle 13, and one steel ball 3 is dropped into the discharge hole 14. Subsequently, as shown in FIG. 3, the ejector rod 21 is advanced to push the steel ball 3 toward the rotor shaft 1. The inner diameter of the discharge hole 14 is set to be slightly larger than the outer diameter of the steel ball 3, and the steel ball 3 itself acts as a piston to absorb an appropriate amount of the grease 8 in the nozzle, and stands it in front. Proceed. First, grease 8 is filled into recess 2 of rotor shaft 1, and then steel balls 3 are embedded therein. The embedded steel balls 3 remain in the recess 2 without falling out due to the adhesive force of the grease 8 until the rotor 9 is assembled to the motor case.

(g) Effects of the invention In the present invention, by utilizing the steel balls themselves as the grease extrusion member, the application of grease to the assembled member and the assembly of the steel balls can be completed in one action, resulting in quick work. Furthermore, during this time, it is only necessary to maintain a fixed positional relationship between the assembled member and the discharge hole, and there is no need to cause any movement of the support device. Since the steel balls advance by shearing the grease mass, there is no need to worry about preventing grease from becoming stringy. In addition, since the steel balls (and grease) are pushed out by the ejector rod instead of being dropped by gravity, there is no need to limit the direction of the recess in the assembled part to upward, allowing for greater freedom in line configuration. It has the advantage of being large.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of the electric motor to which the present invention is applied, explaining the combined use of the motor shaft and its supporting steel balls, and Figs. 2 and 3 are cross-sections of the device of the present invention, illustrating the procedure for assembling the steel balls. It is a diagram. 1... Rotor shaft (assembled member), 2... Recess,
3... Steel ball (rolling member), 14... Discharge hole, 15
... Grease injection path, 16 ... Steel ball guide path, 21
...Egyectrotsud.

Claims (1)

[Scope of Claim for Utility Model Registration] A discharge hole facing a recess in a member to be assembled, a grease injection path that supplies an appropriate amount of grease into the inside of the discharge hole, and a grease injection path that is also inside the discharge hole and is larger than the grease injection path. A steel ball guiding path for supplying one steel ball is located at the back, and an ejector rod that uses the steel ball as a piston to push out the grease from the discharge hole into the recess of the assembled member. A rolling member assembly device comprising: