JPH068897U - Automatic grease feeder - Google Patents

Abstract

(57) [Summary] [Structure] Grease filled in the cylinder 1 is pressurized by the spring 7 and the piston 3 and pushed out little by little from the outlet passage 11. In the outlet passage 11, a shape memory alloy member 15 and a bias spring are provided. On-off valve 1 consisting of 17
9 was provided. The on-off valve 19 opens when the temperature rises above a certain temperature, which is higher than room temperature, and closes when the temperature falls below that temperature. [Effect] When the machine is operating and the bearing temperature is high, grease is normally supplied, and when the machine is stopped and the bearing temperature becomes low, the grease supply can be automatically stopped. This eliminates waste and prolongs the grease replacement period, saving maintenance work.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grease automatic feeder which is attached to a bearing portion of a machine and automatically supplies grease.

[0002]

[Prior art]

 The automatic grease feeder fills the inside of the cylinder with grease, pressurizes the grease with a piston pushed by a spring, pushes it out little by little from the outlet passage, and constantly supplies the grease to the bearing of the machine. The amount of grease supplied can be changed by changing the hole diameter of the flow plug according to the grease consistency.

[0003]

[Problems to be solved by the device]

 The conventional automatic grease feeder has a drawback in that the grease supplied when the machine is stopped is wasted because the grease is supplied when the machine is operating or stopped. Especially in the case of a machine with a short operating time, the amount of grease is large and it is uneconomical.

[0004]

[Means for Solving the Problems]

 The present invention provides an automatic grease feeder that solves the above-mentioned problems, and its configuration is such that the grease filled in the cylinder is pressurized and pushed out a small amount from the outlet passage. In the container, an opening / closing valve is provided in the outlet passage, which opens when a certain temperature higher than room temperature is exceeded by a shape memory alloy member as a drive source and closes when the temperature becomes lower than that.

[0005]

[Action]

 The temperature of the bearing of the machine is higher than room temperature when the machine is operating, and is close to room temperature when the machine is stopped. Since the automatic grease feeder is attached to the bearing, the temperature is the same as that of the bearing. Therefore, if an opening / closing valve that opens when the temperature rises and closes when the temperature falls is provided in the outlet passage using the shape memory alloy member as described above, grease is supplied only when the machine is operating, and the machine stops. It is possible to stop the supply of grease while the operation is in progress.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an automatic grease feeder according to an embodiment of the present invention. In the figure, 1 is a cylinder, 3 is a piston, 5 is an O-ring, 7 is a spring, 9 is a fitting, 11 is an outlet passage, and 13 is an adapter. The tip of the adapter 13 is screwed and fixed to a bearing (not shown) of the machine. The grease filled in the cylinder 1 is pressurized by the piston 3 pushed by the compressed spring 7. Therefore, the grease is pushed out little by little from the outlet passage 11 and supplied to the bearing portion of the machine.

In this embodiment, in such an automatic grease feeder, an on-off valve 19 composed of a shape memory alloy member 15 and a bias spring 17 is incorporated in an adapter 13 forming a part of the outlet passage 11. is there. The shape memory alloy member 15 used here is a plate-shaped member, and becomes a solid line shape (memory shape) at a certain temperature P higher than room temperature by 10 to 20 ° C. and opens the outlet passage 11. At this time, the bias spring 17 is in a state of being compressed by the shape memory alloy member 15. When the temperature of the shape memory alloy member 15 becomes lower than the temperature P, the force for holding the memorized shape is lost, and the shape memory alloy member 15 is deformed by the repulsive force of the bias spring 17 to become the shape of the dotted line. Therefore, the outlet passage 11 is closed by the shape memory alloy member 15.

Since the automatic grease feeder of this embodiment has the above-described structure, when the temperature of the bearing portion becomes higher than the above temperature P, the opening / closing valve 19 opens and the grease is supplied little by little from the outlet passage 11. However, when the machine stops and the temperature of the bearing becomes lower than the temperature P, the on-off valve 19 closes and the supply of grease is stopped. Therefore, the grease is not supplied unnecessarily. When the opening / closing valve 19 closes the outlet passage 11, it does not have to completely close the outlet passage 11 as long as it can increase the flow resistance of the grease and substantially stop the flow of the grease.

FIG. 3 shows another embodiment of the present invention. In this automatic grease feeder, a shape memory alloy member 15 and a bias spring 17 similar to those in the above-mentioned embodiment are provided on the outside of the adapter 13, and a pin 21 movable at a tip of the shape memory alloy member 15 in a direction traversing the outlet passage 11. Is attached. The shape memory alloy member 15 becomes a solid line shape when the temperature is higher than a certain temperature P which is higher than room temperature, and the pin 21 retracts to open the outlet passage 11. When the temperature becomes lower than the temperature P, the shape memory alloy member 15 becomes a dotted line shape and the pin 21 projects And close the exit passage 11. Other than this, it is the same as the above-mentioned embodiment.

In the above embodiment, a plate-shaped shape memory alloy member is used, but the shape of the shape memory alloy member is not particularly limited, and for example, a coil spring-shaped member can be used. Is. Further, in the above embodiment, the compression spring is used as the bias spring, but it is also possible to adopt a structure using a tension spring.

[0011]

[Effect of device]

 As described above, according to the present invention, the grease is normally supplied when the machine is operating and the temperature of the bearing is high, and the grease is automatically stopped when the machine is stopped and the temperature of the bearing becomes low. Therefore, the grease is not wasted, the grease replacement period is extended, and maintenance work can be omitted.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of an automatic grease feeder according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of the automatic grease feeder according to the present invention.

[Explanation of symbols]

 1: Cylinder 3: Piston 7: Spring 11: Outlet passage 13: Adapter 15: Shape memory alloy member 17: Bias spring 19: Open / close valve 21: Pin

Claims (1)

[Scope of utility model registration request] 1. An automatic grease feeder in which a grease filled in a cylinder is pressurized to be extruded little by little from an outlet passage, wherein a constant temperature higher than room temperature is supplied to the outlet passage by using a shape memory alloy member as a driving source. An automatic grease feeder, which is equipped with an on-off valve that opens when the temperature rises above the temperature and closes when the temperature falls below that temperature.