JPS646347B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a cylinder in a pressure pump that pumps a supplied material such as grease or paint.

(Prior Art) Conventionally, a pressure pump for pumping a material to be supplied, such as grease or paint, generally has a structure shown in FIG. 1. In this conventional structure, a plunger 12 is fitted into a cylinder 11 so as to be able to reciprocate, and a suction port 1 for the material to be supplied is provided on a side wall of an intermediate portion of the cylinder 11.
3 is provided, and a delivery port 14 for the material to be supplied is provided in the lower side wall of the cylinder 11, and by operating the handle 15 and reciprocating the plunger 12 up and down as shown in the figure, the material to be supplied sucked into the cylinder 11 is removed. A structure was adopted in which the material was forced to be fed from the outlet 14 through a check valve 16.

(Problems to be Solved by the Invention) In the conventional pressure pump shown in FIG. requested. For this reason, when manufacturing the cylinder 11, the cylinder hole is die-cast to a size including a finishing allowance, and then broached to achieve a highly accurate finish. In order to perform broaching in this manner, the cylinder hole must be penetrating, as is well known. However, due to the function of the cylinder 11 as a pressure pump, the lower end must be closed. Therefore, after broaching, a thread is cut at the lower end of the cylinder hole, and a threaded plug 18 is screwed thereto to seal it. was.

As described above, conventional pressure pumps require broaching and thread cutting to manufacture, and the screw plug 18 must also be prepared separately, which increases processing costs, parts costs, and assembly man-hours. This has the problem of increasing the product price.

The present invention was made in view of the above-mentioned problems, and involves press-fitting a steel ball with an outer diameter approximately equal to that of the plunger into the cylinder hole of the cylinder, and fitting the steel ball into the lower end of the cylinder to form a plug for closing. The present invention provides a method for manufacturing a cylinder in a pressure pump, which eliminates the steps of broaching and thread cutting of the cylinder, and reduces processing costs, parts costs, and assembly man-hours required for manufacturing.

[Structure of the invention]

(Means for Solving the Problems) A method for manufacturing a cylinder in a pressure pump according to the present invention includes fitting a plunger into a cylinder hole of the cylinder so as to be able to reciprocate, and inserting a material to be supplied onto the side wall of the intermediate portion of the cylinder. In a pressure pump having a suction port and a delivery port provided in the lower side wall of the cylinder to send out the material to be supplied by the operation of the plunger, the cylinder hole of the cylinder is filled from the upper end side with a diameter approximately equal to the outer diameter of the plunger. A steel ball having an outer diameter is press-fitted into the cylinder hole, and the inner lower end of the cylinder hole is closed with this steel ball.

(Function) In the method of manufacturing a cylinder in a pressure pump according to the present invention, a plunger is reciprocated within a cylinder hole of the cylinder by moving the handle forward and backward.
Due to the vacuum pressure in the cylinder hole as the plunger moves forward, the material to be fed is sucked into the cylinder from the suction port, and the material sucked into the cylinder as the plunger moves back is forced out from the delivery port. In this pump, the cylinder hole of the cylinder is press-fitted with a steel ball having an outer diameter approximately equal to that of the plunger during manufacture, and the steel ball is press-fitted into the cylinder hole. The steel ball is machined so that the plunger can be slidably fitted in close contact with the steel ball, and the end of the steel ball inside the cylinder is closed, thereby eliminating the need to machine the cylinder hole with a broaching tool. .

(Example) The configuration of an example of the present invention will be explained with reference to FIG.

11 is a cylinder, a plunger 12 is fitted into the cylinder hole of this cylinder 11 so as to be able to reciprocate, and a suction port 13 for the material to be supplied that communicates with the cylinder hole is formed in the side wall of the middle part of this cylinder 11. . Further, a delivery port 14 for the material to be supplied is formed in the lower side wall of the cylinder 11 so as to communicate with the cylinder hole.

Further, the vicinity of the tip of the handle 15 is connected to the protruding end of the plunger 12 from the cylinder 11, which is reciprocatably inserted into the cylinder hole of the cylinder 11, by means of a pin 21. The tip of the handle 15 is curved downward in the figure.
One end of a link 23 is connected to the tip of the cylinder 11 via a connecting pin 22, and the other end of the link 23 is connected via a fulcrum pin 25 to a main body frame 24 integrally formed on the outer left side surface of the cylinder 11 in the drawing. Pivotally supported for free rotation. When the right side of the handle 15 is raised, a rotational force is generated in the handle 15 in a counterclockwise direction around the pin 21, and the plunger 12 is pulled upward while the link 23 is rotated clockwise. When the right side of the handle 15 in the figure is lowered, the plunger 12 is pushed down by an action opposite to the above.

Further, a cylindrical attachment portion 27 is provided on the outer right side surface of the cylinder 11 in the figure, that is, in a portion surrounding the suction port 13 for the material to be supplied.
will be established. A female threaded portion 28 is formed on the inner circumferential surface of the mounting portion 27, and is screwed into a male threaded portion formed on the outer circumference of a supply portion (not shown) of a material to be supplied, for example, a cylindrical object, so that the supply portion is connected to the cylinder 11. The suction port 1 is installed and has its outlet formed in the side wall of the cylinder 11.
3. Here, the material to be supplied in the supply section is
The vacuum pressure inside the cylinder 11 as the plunger 12 rises causes suction into the cylinder 11 through the suction port 13 .

Furthermore, the outlet 1 formed at the bottom of the cylinder 11
A check valve 16 is provided at the tip of the check valve 1.
Reference numeral 6 is composed of a valve 30 formed of a steel ball that covers the outlet portion of the outlet port 14, and a spring 31 that applies a force to the valve body 30 to always press the outlet portion. The check valve 16 is opened only when the plunger 12 is lowered to forcefully feed the material to be supplied, and the valve body 30 is separated from the outlet section by the pressure applied thereto.
A female threaded portion 33 is formed at the outer end of the check valve 16, and this female threaded portion 33 serves as a connecting portion for a conduit leading to a predetermined supply location (not shown).

Further, when manufacturing the cylinder 11, the inner diameter of the cylinder hole is previously machined to be smaller than a predetermined inner diameter into which the plunger 12 is fitted, and a steel ball 35 having an outer diameter approximately equal to that of the plunger 12 is inserted into the cylinder hole. Press fit into the cylinder 11 from the upper end side.
By press-fitting the steel ball 35, the inner surface of the cylinder 11 is broached using the steel ball as a broach, so that the plunger 12 can be slidably fitted in a close state. Further, the pressing force on the steel ball 35 is released when the steel ball 35 reaches the lower end inside the cylinder 11. Therefore, the steel ball 35 is firmly fitted into the lower end of the cylinder 11 and serves as a plug for the cylinder 11 to close the lower end of the cylinder 11.

〔Effect of the invention〕

According to the present invention, the inner surface of the cylinder is broached with the steel ball by press-fitting the steel ball into the cylinder hole of the cylinder during manufacture and fitting the steel ball into the lower end of the cylinder as it is. At the same time, the end of the cylinder is closed with a steel ball, so there is no need to broach the inner surface of the cylinder, and there is no need to close the end of the cylinder with a plug, reducing parts costs.In addition, a plug can be installed to close the cylinder. Since there is no need for additional machining and assembly work, the amount of machining can be reduced, and machining costs and assembly man-hours are also reduced, resulting in a product that is significantly advantageous in terms of cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional pressure pump, and FIG. 2 is a sectional view of a pressure pump showing an embodiment of the present invention. 11...Cylinder, 12...Plunger, 13
... Suction port for the material to be supplied, 14... Output port, 35...
…wrecking ball.

Claims (1)

[Scope of Claims] 1. A plunger is fitted into the cylinder hole of the cylinder so as to be able to reciprocate, and a suction port for the material to be supplied is provided on the middle side wall of the cylinder, and the plunger is provided on the lower side wall of the cylinder. In a pressure pump provided with a delivery port that delivers the material to be supplied by operation, a steel ball having an outer diameter approximately equal to the outer diameter of the plunger is press-fitted into the cylinder hole of the cylinder from the upper end side, and the steel ball is used to A method for manufacturing a cylinder in a pressure pump, characterized in that the lower end of the cylinder hole is closed.