JP2005344853A - Unlubricated worm speed reducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of being difficult to use a worm speed reducer in water due to actual difficulty of applying seal, though sure seal is needed to prevent oil leak when used in water, for injecting or replacing grease and oil. <P>SOLUTION: A gear part is formed of a self-lubricating resin, and a shaft part is formed of stainless steel, and is composed of a worm gear and a worm wheel integrally molded with the self-lubricating resin of the gear part and the stainless steel of the shaft part, a worm cover for rotatably supporting the worm gear via a bearing, and a wheel cover for rotatably supporting the worm wheel via the bearing. A blade is installed in the shaft part of the worm gear, to form an air flow by rotation of the shaft part of the worm gear. Thus, this unlubricated worm speed reducer usable even in water can be provided requiring no injection or replacement of grease and oil. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention can be used without lubrication. In addition to normal use, the present invention can be used in places such as a pool, a fountain, a sluice, or the like (hereinafter referred to as water). ) Is an oil-free worm speed reducer that can also be used.

  In the conventional worm reducer, it was necessary to inject or replace grease or oil in order to prevent seizure of the tooth surfaces of the worm gear and worm wheel and to lubricate the bearing. In order to remove the initial wear powder after the familiar operation after the start of operation, the worm speed reducer needs to be replaced for the first time in 50 hours and thereafter at intervals of once every six months. Since grease or oil injection or replacement work is necessary in this way, when using the worm speed reducer in water, it is necessary to provide a reliable seal so as not to leak oil. However, in reality, it is difficult to apply a seal, and it is difficult to use the worm speed reducer underwater.

  Some resin worm gears or worm wheels are known in order to eliminate the need to replace grease and oil for lubrication as described above. The bearing had to be lubricated, and it did not become a worm speed reducer that did not require lubrication.

  Moreover, when the literature was investigated about the worm speed reducer, there was the following literature. Document (1) is Japanese Patent Laid-Open No. 7-301285 “Orthogonal Shaft Reducer”, in which the orthogonal gear is composed of a worm wheel and a worm wheel meshing with the worm gear, and the material of the worm wheel is brass to which silicon and manganese are added. The lubrication grease for the worm gear is a grease based on a mineral or synthetic oil containing molybdenum dialkyldithiocarbamate (MoDTC) and molybdenum dialkyldithiophosphate (MoDTP) as additives and using a urea-based thickener. It is characterized by.

  Document (2) is Japanese Patent Application Laid-Open No. 2004-19820 “Deceleration Gear for Electric Power Steering Device” in which a polyamide resin composition and a radical generator and two or more carbon-carbon double bonds are formed on the outer periphery of a metal core tube. It comprises a worm wheel comprising a molded part formed by crosslinking with a polyfunctional monomer having a resin part having gear teeth formed on its outer peripheral surface.

JP-A-7-301285 JP2004-19820

  Document (1) is small and has a long service life. However, since lubrication grease is used, lubrication grease must be replenished periodically, which is costly and troublesome. There are problems such as difficulty in use in places with high humidity.

  Reference (2) is excellent in wear resistance, but it does not mean that it is not necessary to inject lubricating oil at all. Lubricating grease, oil, etc. must be periodically injected or replaced. There are problems such as being time-consuming and using lubricating grease or oil, so that it is difficult to use in water or in a place with high humidity.

  The present invention provides an oil-free worm speed reducer that can be used even in water without the need to inject and replace grease, oil, etc., and enables an almost non-lubricated state that does not require the injection of lubricating oil. There is a feature that it does not take time and effort to inject or replace oil, oil, etc., therefore, it is possible to reduce the cost, and generation of static electricity due to friction can be avoided by causing movement of air by the blades.

According to the first aspect of the present invention, the gear portion is formed of a self-lubricating resin, the shaft portion is formed of stainless steel, the self-lubricating resin of the gear portion and the stainless steel of the shaft portion are integrally formed, and the gear portion is self A worm wheel formed of a lubricious resin, a shaft portion made of stainless steel, a self-lubricating resin of a gear portion and a stainless steel of a shaft portion are integrally formed, and the worm gear is rotatably supported via a bearing. An oil-free worm speed reducer composed of a worm cover and a wheel cover that rotatably supports the worm wheel via a bearing,
An oil-free worm speed reducer characterized in that blades are attached to the shaft portion of the worm gear and an air flow is created by rotation of the shaft portion of the worm gear.

  The present invention is characterized in that, by making a part transparent, it is possible to grasp the internal state, leading to an improvement in safety, and facilitating the grasp of failure / part replacement time.

  A second aspect of the present invention is an oil-free worm speed reducer in which at least one of the worm cover and the wheel cover uses a transparent material.

  The present invention includes a worm gear in which a gear part is formed of a self-lubricating resin, a shaft part is formed of stainless steel, a self-lubricating resin of the gear part and stainless steel of the shaft part, and the gear part is self-lubricating. The worm wheel is made of a synthetic resin, the shaft part is made of stainless steel, the self-lubricating resin of the gear part and the stainless steel of the shaft part are integrally formed, and the worm cover that rotatably supports the worm gear via a bearing And a wheel cover that rotatably supports the worm wheel via a bearing, the oil-free worm speed reducer having vanes attached to the shaft portion of the worm gear, and air flow by rotation of the shaft portion of the worm gear This is an oil-free worm speed reducer. Accordingly, it is possible to provide an oil-free worm speed reducer that can be used even in water without the need to inject and replace grease or oil. In other words, share in fields where it has been difficult to use worm speed reducers, such as conveyors in the IT industry, speed reducers for preventing foreign matter contamination in the food industry, filling equipment, packaging machines, and the robot and marine industries. Can be spread. In particular, it is not necessary to add grease or oil for lubrication and can be used semipermanently, so it is very effective as a small reduction gear used for a robot or the like. In addition, since no lubricating oil such as grease or oil is used, it is compatible with the hygiene management method of the food industry, which is called HACCP (Hazard Analysis Important Control Point). It is effective for. In addition, since almost no lubrication is required without injecting lubricating oil, there is no need to inject or replace grease, oil, etc., less labor, lower costs, and static electricity due to friction. The generation is characterized in that it can be avoided by causing air movement by the blades.

  The present invention is an oil-free worm speed reducer in which at least one of a worm cover and a wheel cover uses a transparent material. Therefore, by making a part transparent, it is possible to grasp the internal state, leading to an improvement in safety, and facilitating grasp of failure / part replacement timing.

  The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a front view of a worm reducer according to the present invention. The worm speed reducer main body A is configured by combining the worm gear 1, the shaft portion 11 integrally formed with the worm gear 1, and the two gears of the worm wheel 2 and the shaft portion 21 integrally formed with the worm wheel 2. . Therefore, the cover of the worm reduction gear A covers the worm gear 1, covers the worm cover 5 that supports the shaft portion 11 of the worm gear 1, the worm wheel 2, and the wheel cover 6 that supports the shaft portion 21 of the worm wheel 2. It can be divided into two covers.

  The worm cover 5 and the wheel cover 6 are made of aluminum having good thermal conductivity. By using aluminum as a raw material, rust prevention can be achieved, and use in water is also possible (use in water will be described later). Use of aluminum makes it lighter and easier to transport. Further, the worm cover 5 and / or the wheel cover 6 can be made of a transparent material so that the state of the worm gear 1 and the worm wheel 2 in the worm cover 5 and the wheel cover 6 can always be confirmed. By using a transparent material (glass, reinforced plastic, etc.), the state of the worm gear 1 and the worm wheel 2 can always be confirmed, the state of gears and wheels other than the worm gear 1 and the worm wheel 2 can be confirmed, and contamination of impurities can be prevented. If an abnormality occurs in the gear or wheel, it is possible to respond quickly. As a result, the cost and labor required for maintenance can be greatly reduced, and the gears and wheels can always be kept in an optimum state. The material of the worm cover 5 and the wheel cover 6 is not limited to aluminum, and may be a carbon fiber resin having high thermal conductivity equivalent to or higher than aluminum.

  The worm gear 1 is rotatably supported by the worm cover 5 via a bearing 4 that receives the shaft portion 11 of the worm gear 1. The worm gear 1 is made of a stainless steel material for the purpose of rust prevention when the worm reduction gear A is used in water. The central portion of the worm gear 1 is stainless steel, and the gear portion is made of a self-lubricating resin such as MC nylon. Shaft portions 11 at both ends of the worm gear 1 are supported by the worm cover 5 by bearings 4.

  A blade 3 is attached between the worm gear 1 and the bearing 4. Since the blade 3 is attached to the shaft portion 11 of the worm gear 1, it rotates in the same manner as the rotation of the shaft portion 11 of the worm gear 1. Gears and wheels generate static electricity due to friction caused by rotational contact, but by attaching the blades 3, it is possible to circulate (move) the air in the worm reducer, remove heat generated by friction, static electricity Can be prevented and corona discharge can be prevented. Moreover, since the material is aluminum which is a conductive metal, it is possible to prevent charging.

  Next, the worm wheel 2 is formed by integral molding of stainless steel and self-lubricating resin, the shaft portion 21 is made of stainless steel, the gear portion is formed of self-lubricating resin, and the shaft portion 21 is Rust prevention is achieved by using stainless steel. Both ends of the shaft portion 21 are rotatably supported by the wheel cover 6 by bearings 41, whereby the worm wheel 2 is rotatably supported in mesh with the worm gear 1. It is also possible to connect to another wheel 8 from the shaft portion of the worm gear 1.

  As described above, the worm gear 1 and the worm wheel 2 are supported by the worm cover 5 or the wheel cover 6 via the bearings 4 and 41, respectively, and the two central gears of the worm portion and the worm wheel portion are configured. Yes. And the worm reduction gear A is comprised by combining these two. The bearings 4 and 41 are dry bearings. Reference numeral 7 denotes a table for supporting the worm reduction gear A.

  The worm speed reducer A of the present invention is configured as described above, and according to this configuration, the following operational effects can be obtained. Since the worm gear 1 and the worm wheel 2 are made of a self-lubricating resin, there is no need to periodically add grease or oil to promote lubrication as in the prior art. Can be driven well.

  Considering the case where the worm reduction gear A is used in water, the water enters the interior of the worm reduction gear A through the clearance of the bearings 4 and 41 in the water, so that the inside of the worm reduction gear A is filled with water. . That is, the worm gear 1 and the worm wheel 2 are used in a state immersed in water. Therefore, since water acts as cooling water, heat generated by friction generated when the worm gear 1 and the worm wheel 2 are engaged or heat generated by friction of the bearings 4 and 41 is suppressed by water. In addition, since the worm cover 5 and the wheel cover 6 are made of aluminum having good thermal conductivity, the heat dissipation effect is enhanced also in this respect, and the worm speed reducer A operates well. In addition, since it does not generate static electricity when used in water, blades are not necessary.

  In addition, since the bearings 4 and 41 used in water are made of resin and are elastic bodies, the shape changes with the rotation and stop of the worm gear 1 and the worm wheel 2 and elastically returns to a circular shape. This is because the bearings 4 and 41 are made of resin and are elastic and can function as a water discharge pump. When the worm gear 1 is activated and the worm gear 1 and the worm wheel 2 are rotated, the worm cover 5 is activated. In addition, water is circulated between the inside and the outside of the wheel cover 6, and the above cooling operation is performed more efficiently. Moreover, the bearings 4 and 41 should just be an elastic body, and are not limited to the thing made from resin. In addition, since the worm reducer A is submerged in water, it is not necessary to seal it with the intention of airtightness, and as described above, it is possible to reduce the number of parts by the cooling effect of water, the heat dissipation effect of aluminum material, etc. Lower costs and easier maintenance.

  It is also possible to prevent the invasion of water by sealing the periphery of the worm speed reducer A, so that the worm speed reducer A can be used in the same way as in the air when used underwater. In this case, the corona discharge can be prevented by the rotation of the blade 3 attached to the shaft portion 11 between the worm gear 1 and the bearing 4. Also, even if water enters, rust prevention is possible because the material is aluminum or a transparent material.

  As described above, the worm speed reducer A of the present invention can be used in water, and can sufficiently exhibit its function even in water. As an example of use in water, for example, it can be considered to be used for various devices for opening / closing driving of a sluice, a pool, a fountain or hydroponics.

  Conventionally, the worm reducer A that is assumed to be used in such a part has not been provided, and when a very general worm reducer that is assumed to be used in the atmosphere is diverted for underwater use, grease is used. In order to prevent leakage of oil and lubricating oil, it is necessary to provide a special seal, which increases the cost and in reality it is impossible to use the worm reducer immersed in water. In this respect, the worm reduction gear A of the present invention is assumed to be used in water. That is, the worm speed reducer A of the present invention is in a substantially non-lubricated state that does not require the injection of lubricating oil, so there is no risk of oil leakage such as grease or lubricating oil even when used in water. No seal is required. In particular, since the self-lubricating resin is used for the gear portions of the worm gear 1 and the worm wheel 2, the worm gear 1 and the worm wheel 2 can be used semipermanently. The worm speed reducer A has a function of transmitting rotation by sliding contact, and when the amount of lubricant such as grease or lubricating oil decreases, sliding friction increases, which may cause failure. However, by using a self-lubricating resin, sliding friction is minimized, and a smooth and stable lubrication state can always be maintained. In addition, it is almost unlubricated without the need for lubricating oil injection, and there is no risk of oil leakage, so it is clean, does not contaminate the water due to oil leakage, etc., and can be used without destroying the environment. is there.

  In the worm speed reducer A of the present invention, the covers can be separated into a worm cover 5 that supports the worm gear 1 and a wheel cover 6 that supports the worm wheel 2. Accordingly, the worm gear 1 and the worm wheel 2 can be assembled separately and can be finally combined, so that the assembly work of the worm speed reducer A can be made more efficient.

It is a front view of the worm reduction gear which is this invention. It is a side view of the worm speed reducer which is this invention. It is a partially transparent perspective view of the worm speed reducer which is the present invention. It is a perspective view of the worm speed reducer which is this invention. It is a perspective view showing the example of actual use of the worm reduction gear which is this invention. It is an expansion perspective view of the blade | wing used for the worm reduction gear which is this invention. It is a perspective view of the worm gear with a blade | wing used for the worm reduction gear which is this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Worm gear 11 Shaft part 2 Worm wheel 21 Shaft part 3 Blade | blade 4 Bearing 41 Bearing 5 Worm cover 6 Wheel cover 7 units 8 Wheel A Worm reduction gear W Water

Claims (2)

The gear part is made of self-lubricating resin, the shaft part is made of stainless steel, the gear part is made of a self-lubricating resin and the stainless steel of the shaft part, and the gear part is made of self-lubricating resin. A worm wheel in which a shaft portion is formed of stainless steel, a self-lubricating resin of a gear portion and stainless steel of the shaft portion are integrally formed, a worm cover that rotatably supports the worm gear via a bearing, An oil-free worm reduction gear comprising a wheel cover that rotatably supports the worm wheel via a bearing,
An oil-free worm speed reducer characterized in that a blade is attached to the shaft portion of the worm gear and an air flow is created by rotation of the shaft portion of the worm gear. The oilless worm speed reducer according to claim 1, wherein at least one of the worm cover and the wheel cover uses a transparent material.

Images