KR20240010808A - Device for preventing wear of oil seal part of crane hoist reducer - Google Patents

Abstract

The present invention relates to a device for preventing wear of the oil seal of a crane hoist reducer. The device for preventing wear of the oil seal of a crane hoist reducer according to an embodiment of the present invention includes a reducer body, a connecting shaft, a bearing surrounding the connecting shaft, and a plurality of devices. It is a wear prevention device for the oil seal part of a crane hoist reducer including an oil seal, and includes a bearing cover that supports the bearing, a feeding hole provided in the bearing cover and supplying lubricating oil toward the oil seal, and a plurality of lubricating oils supplied through the feeding hole. Includes an oil feed ring that feeds between the oil seals.

Description

Device to prevent wear of oil seal part of crane hoist reducer {DEVICE FOR PREVENTING WEAR OF OIL SEAL PART OF CRANE HOIST REDUCER}

The present invention relates to a device for preventing wear of the oil seal of a crane hoist reducer, and more specifically, to prevent excessive wear by applying lubricant to the contact area of the oil seal, and to prevent excessive wear by inserting a sleeve between the reducer connecting shaft and the oil seal. This relates to a wear prevention device for the oil seal of a crane hoist reducer that can shorten maintenance time and reduce costs by replacing the sleeve.

In general, cranes play a role in transporting goods or products from each factory, and are a key facility that is directly connected to production by being responsible for the logistics flow of the factory.

Among the components that make up a crane, there is a reducer. The reducer reduces the rotational force of the motor to a set reduction ratio and serves to amplify the rotational force.

For example, a crane hoist reducer allows the transport of objects or products by pulling a wire rope upward or downward.

Meanwhile, in the case of a crane hoist reducer, an oil seal is installed and used to prevent equipment failure due to oil leak from the connecting shaft of the reducer.

However, these oil seal parts harden after long-term use or due to high temperature or high-temperature conditions in the environment around a steel mill. And, as the oil seal part hardens, excessive wear of the oil seal part occurs at the part in contact with the connecting shaft of the reducer, and there is a problem that oil leakage occurs from the excessively worn part.

If oil leakage occurs for a long period of time, it may cause a shortage of internal oil in the crane hoist reducer, which may make lubrication difficult and cause serious problems such as damage to gears and bearings. Furthermore, the problem of environmental pollution due to oil leakage becomes serious, causing difficulties in facility management.

On the other hand, when excessive wear occurs on the reducer connecting shaft and oil seal, it is difficult to replace parts, and when the entire reducer must be replaced, the time required for maintenance increases and costs increase.

Therefore, there is a need for the development of a wear prevention device for the oil seal of a crane hoist reducer that can improve the above-described conventional problems and respond quickly in real time, contributing to stabilization of equipment and improvement of productivity.

Prior literature related to the present invention includes Korean Patent Publication No. 10-2012-0036085 (published on April 17, 2012), which discloses information about an oil seal installed on a shaft to seal lubricating oil.

Republic of Korea Patent Publication No. 10-2012-0036085

The purpose of the present invention is to provide a wear prevention device for the oil seal of a crane hoist reducer that can prevent excessive wear by applying lubricant (e.g. grease, etc.) to the contact area between the connecting shaft and the oil seal of the crane hoist reducer.

Another object of the present invention is to protect the connecting shaft of the reducer by inserting a sleeve between the connecting shaft of the reducer and the oil seal, and to reduce maintenance time and reduce costs by replacing the sleeve with a new one when the sleeve is excessively worn. The purpose is to provide a device to prevent wear of the oil seal of a crane hoist reducer.

Another object of the present invention is to provide a wear prevention device for the oil seal of a crane hoist reducer, which can contribute to improving equipment reliability and productivity by enabling stable management and operation of the crane hoist reducer.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention that are not mentioned can be understood by the following description and will be more clearly understood by the examples of the present invention. Additionally, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the patent claims.

According to one aspect of the present invention for achieving the above object, a crane hoist reducer that can prevent excessive wear by applying lubricant (e.g. grease, etc.) to the contact area between the connecting shaft of the crane hoist reducer and the oil seal part. A device to prevent wear of the oil seal can be provided.

An oil seal wear prevention device of a crane hoist reducer according to an embodiment of the present invention includes a reducer body; a connecting shaft that protrudes from the reducer body at a certain length and outputs rotational force reduced at a set reduction ratio to the outside; a bearing coupled to surround the connecting shaft inside the reducer body; and a wear prevention device for the oil seal of a crane hoist reducer, including a plurality of oil seals surrounding the outer peripheral surface of the connecting shaft at a position close to the bearing, wherein the device includes a bearing cover fastened to the reducer body and supporting the bearing; a feeding hole provided in the bearing cover and supplying lubricating oil toward the oil seal; and a feed ring located between the plurality of oil seals inside the bearing cover and supplying lubricating oil supplied through the feed hole between the plurality of oil seals.

In the oil seal wear prevention device of a crane hoist reducer according to an embodiment of the present invention, the bearing cover includes: a bearing cover body portion that protrudes forward of the reducer body when fastened to the reducer body and has a ring shape; and a bearing side support portion that has the same outer diameter size as the bearing cover body portion, extends to the rear of the bearing cover body portion, and contacts and supports the side surface of the bearing.

In the oil seal wear prevention device of the crane hoist reducer according to an embodiment of the present invention, the bearing cover is located between the bearing cover body and the bearing side support and extends in the radial direction, and is provided with a fastening screw to the reducer body. It further includes a flange portion having a plurality of fastening holes for fastening.

At this time, the bearing cover further includes an inner diameter protrusion that protrudes by a predetermined length in the radial direction from the inner peripheral surface of the bearing cover body portion. The inner protrusion supports the oil seal located on the inside, that is, close to the bearing, among the plurality of oil seals, maintains the position of the oil seal stably, and prevents excessive wear by blocking the flow of the oil seal.

In the oil seal wear prevention device of a crane hoist reducer according to an embodiment of the present invention, the feed hole may be formed to penetrate the bearing cover body in the radial direction on the outer peripheral surface of the bearing cover body.

In the oil seal wear prevention device of a crane hoist reducer according to an embodiment of the present invention, the feed hole is a groove formed on the outer peripheral surface of the bearing cover body to have a predetermined height step, and is circular with a hole entrance formed through the center. home; and an internal flow path that passes from the hole inlet to the hole outlet formed on the inner peripheral surface of the bearing cover body portion and flows the lubricating oil supplied to the hole inlet to the hole outlet.

In the oil seal wear prevention device of a crane hoist reducer according to an embodiment of the present invention, the hole outlet is positioned to face the feed ring, and the lubricating oil supplied through the hole outlet is supplied to the upper part of the feed ring. It can be.

In the oil seal wear prevention device of the crane hoist reducer according to an embodiment of the present invention, the feed ring has a ring shape and is formed through a predetermined interval along the circumferential direction to allow the lubricant supplied through the hole outlet to be supplied to the lubricant. An oil supply ring body portion having a plurality of oil oil holes for supplying oil between a plurality of oil seals; and a plurality of side protrusions formed to block both sides of the paper feeding ring body and forming ring-shaped grooves through the upper and lower portions of the paper feeding ring body.

In the oil seal wear prevention device of the crane hoist reducer according to an embodiment of the present invention, the plurality of side protrusions have an inner diameter size smaller than the inner diameter size of the feed ring body portion and are expanded than the outer diameter size of the feed ring body portion. It can have any outer diameter size. Accordingly, the upper part of the feeding ring body and the plurality of side protrusions protruding on both sides of the feeding ring body form a ring-shaped groove, and the ring-shaped groove receives a certain amount of lubricant supplied through the hole outlet of the feeding hole, and the feeding ring body portion Lubricating oil can be smoothly distributed and oiled between a plurality of oil seals by passing through the oiling hole provided in the oil seal. Accordingly, sufficient lubricant can be applied to the rotating parts of the oil seals between the plurality of oil seals, thereby reducing friction and preventing wear and damage.

In the oil seal wear prevention device of a crane hoist reducer according to an embodiment of the present invention, the oil seal cover is fastened to the front of the bearing cover body and supports an oil seal located on the outside of the plurality of oil seals. . The oil seal cover includes an oil seal cover body portion fastened to the front of the bearing cover body portion; and a support step portion that is inserted at a set length from the oil seal cover body toward the inner peripheral surface of the bearing cover body and seats the front end of the bearing cover body. Accordingly, the oil seal located on the outside of the plurality of oil seals is supported by the support step of the oil seal cover, and the oil seal located on the inside among the plurality of oil seals is supported by the inner diameter protrusion, thereby securing the position of the oil seal. It can be maintained stably.

Meanwhile, according to another aspect of the present invention, the connecting shaft of the reducer is protected by applying a sleeve between the connecting shaft and the oil seal portion of the reducer, and the oil seal portion of the crane hoist reducer can be quickly and simply replaced with a new worn sleeve. A prevention device can be provided.

An oil seal wear prevention device of a crane hoist reducer according to an embodiment of the present invention includes a reducer body; a connecting shaft that protrudes from the reducer body at a certain length and outputs rotational force reduced at a set reduction ratio to the outside; a bearing coupled to surround the connecting shaft inside the reducer body; and a wear prevention device for the oil seal of a crane hoist reducer, including a plurality of oil seals provided at a position close to the bearing, comprising: a sleeve coupled to surround the connecting shaft and rotating together with the connecting shaft; a bearing cover fastened to the reducer body and supporting the bearing; a feeding hole provided in the bearing cover and supplying lubricating oil toward the oil seal; and a feed ring located between the plurality of oil seals inside the bearing cover and supplying lubricating oil supplied through the feed hole between the plurality of oil seals.

In the oil seal wear prevention device of the crane hoist reducer according to an embodiment of the present invention, the sleeve may be coupled to the outer peripheral surface of the connecting shaft through interference fit.

Additionally, in the oil seal wear prevention device of the crane hoist reducer according to an embodiment of the present invention, a plurality of oil seals may be formed to surround the outer peripheral surface of the sleeve. Accordingly, the sleeve coupled to the connecting shaft with an interference fit so as to be located between the connecting shaft of the reducer and the oil seal portion protects the connecting shaft from wear, and when the sleeve is worn, only the sleeve can be quickly replaced with a new one.

According to an embodiment of the present invention, there is an advantage in preventing excessive wear by applying lubricant to the contact area between the connecting shaft of the crane hoist reducer and the oil seal.

In addition, according to an embodiment of the present invention, the connecting shaft of the reducer is protected by inserting a sleeve between the reducer connecting shaft and the oil seal portion, and when the sleeve is excessively worn, the sleeve can be quickly and easily replaced with a new product. Accordingly, there is an advantage in reducing maintenance time and reducing costs.

In addition, according to the embodiment of the present invention, stable management and operation of the crane hoist reducer is possible, which has the advantage of contributing to improved facility reliability and productivity.

In addition to the above-described effects, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

Figure 1 is a perspective view showing the schematic appearance of a general crane hoist reducer.
Figure 2 is a perspective view schematically showing a crane hoist reducer to which an oil seal wear prevention device according to an embodiment of the present invention is applied.
Figure 3 is a view showing a schematic view of the oil seal wear prevention device applied to the reducer connection shaft by enlarging the "A" area of Figure 2.
Figure 4 is a diagram showing the detailed structure of the oil seal wear prevention device shown in Figure 3.
Figure 5 is a perspective view schematically showing the sleeve included in the oil seal wear prevention device of the crane hoist reducer according to an embodiment of the present invention.
Figure 6 is a perspective view schematically showing the feed ring included in the oil seal wear prevention device of the crane hoist reducer according to an embodiment of the present invention.
Figure 7 is a diagram showing how lubricating oil (i.e., grease) is evenly supplied to the oil seal portion when the reducer connecting shaft rotates in the oil seal portion wear prevention device of the crane hoist reducer according to an embodiment of the present invention.

Hereinafter, with reference to the drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are assigned the same reference numerals throughout the specification. Additionally, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. In adding reference numerals to components in each drawing, identical components may have the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the components are not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component may be directly connected or connected to that other component, but there are no other components between each component. It should be understood that may be “interposed” or that each component may be “connected,” “combined,” or “connected” through other components.

Additionally, in implementing the present invention, the components may be subdivided for convenience of explanation, but these components may be implemented in one device or module, or one component may be implemented in multiple devices or modules. It may be implemented separately.

A crane is a device that transports heavy objects or products, and is a key facility that is directly connected to production by taking charge of the logistics flow of a factory. A reducer (or reduction gear) is mainly used in cranes to amplify the rotational force by slowing down the rotational force of the motor.

As an example, a crane hoist pulls a wire rope upward or downward to transport heavy objects or products, and a reducer is used in the crane hoist.

Figure 1 shows a schematic view of a typical crane hoist reducer.

Referring to FIG. 1, a crane hoist reducer (hereinafter referred to as a reducer) 10 includes a reducer body 11 that forms the external shape of the reducer and protects the reduction gear, and a connecting shaft 11.

For example, the inside of the reducer body 11 may be provided with a sun gear that is connected to the output shaft of the motor and rotates, and a planetary gear that is disposed around the sun gear to reduce the rotation of the motor and amplify the rotational force. However, there is no need to be limited to this type of reduction gear, and various types of reducers that are obvious to those skilled in the art can be used without limitation.

The connecting shaft 13 has a shape that protrudes to the outside of the reducer body 11 by a certain length, and transmits rotational force to elements that require large rotational force within the crane hoist. Additionally, the connecting shaft 13 may be provided with an oil seal 30 (see FIG. 3) to prevent leakage of lubricating oil, that is, oil.

However, the oil seal 30 (see FIG. 3) may be hardened due to long-term use or a high-temperature working environment, and as a result, excessive wear occurs between the connecting shaft 13 and the oil seal portion 30 (see FIG. 3). There is a problem. Also, there was a problem with oil leaking through excessively worn parts.

If oil leakage continues for a long period of time, lubrication becomes difficult due to lack of oil in the reducer 10, which may cause serious problems such as damage or destruction of gears and bearings. In addition, oil leaks pollute the environment around the workplace, creating great difficulties in facility management.

In addition, when excessive wear occurs in the connecting shaft 13 and the oil seal part 30 (see Figure 3), partial maintenance is difficult, and in severe cases, the entire reducer must be replaced, which increases maintenance time and costs. there was.

The present invention was developed to improve the oil seal wear problem of such crane hoist reducers, and provides sufficient lubricant (e.g. grease, etc.) to the rotating part between the connecting shaft 13 and the oil seal 30 (see FIG. 3). Provides a device to prevent wear of oil seals that can be oiled.

In addition, the present invention protects the connecting shaft 13 from excessive wear by adding a sleeve 150 (see FIG. 3) to the connecting shaft 13, and provides an oil seal portion of a crane hoist reducer that can easily replace only the sleeve during maintenance. Provides an anti-wear device.

Hereinafter, an oil seal wear prevention device of a crane hoist reducer according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

In the drawings, FIG. 2 is a view showing the overall appearance of a crane hoist reducer to which an oil seal wear prevention device according to an embodiment of the present invention is applied, FIG. 3 is an enlarged view of the "A" area of FIG. 2, and FIG. 4 is This is a drawing showing the detailed structure of the oil seal wear prevention device of the crane hoist reducer. And Figure 5 is a diagram showing the schematic appearance of the sleeve, and Figure 6 is a diagram showing the schematic appearance of the paper feed ring.

As shown, the crane hoist reducer 10 includes a reducer body 11 that forms the outer shape of the reducer, and a connecting shaft 13 that protrudes from the reducer body 11 at a certain length and outputs the rotational force reduced at a set reduction ratio to the outside. ) includes.

In addition, the crane hoist reducer 10 includes a bearing 20 and an oil seal 30 that surround and couple the connecting shaft 13 inside the reducer body 11.

The bearing 20 is a device that reduces rotational friction when the connecting shaft 13 rotates.

The bearing 20 is not limited to the form shown, and any bearing form that is obvious to those skilled in the art can be used without limitation.

The oil seal 30 refers to a seal member that prevents leakage of lubricant for smooth rotation of the connecting shaft 13.

For example, a plurality of oil seals 30 (eg, two, etc.) may be provided. The plurality of oil seals 30 includes an oil seal 31 located on the inside and an oil seal 32 located on the outside.

Specifically, one of the two oil seals 30 may be located close to the bearing 20, and the other oil seal 32 may be located relatively far from the bearing 20. .

Additionally, a predetermined gap is formed between the plurality of oil seals 31 and 32. A paper feed ring 130, which will be described later, may be located in this gap area.

A plurality of oil seals 30 may be arranged to surround the outer peripheral surface of the connecting shaft 13.

2 to 4, the oil seal wear prevention device 100 of a crane hoist reducer according to an embodiment of the invention includes a bearing cover 110, a feeding hole 120, a feeding ring 130, and an oil seal. Includes a cover 140 and a sleeve 150.

The sleeve 150 is a member assembled by interference fit to the outer diameter, that is, the outer circumferential surface, of the connecting shaft 13.

The sleeve 150 protects the connecting shaft 13 from excessive wear.

In addition, in case excessive wear occurs, it provides a structure in which only the sleeve 150, not the entire reducer 10, can be easily replaced (see FIG. 4).

Specifically, the sleeve 150 may be a hollow, circular tubular member (see FIG. 5).

Referring to FIG. 5, the sleeve 150 has a hollow formed at the inner center and may have a circular tube shape with a constant inner diameter size. The inner diameter of the sleeve 150 may have a size corresponding to the outer diameter of the connecting shaft 13.

For example, the sleeves 150 may be assembled in an interference fit so as to surround the outer circumferential surface of the connecting shaft 13. The sleeve 150 surrounds the outer peripheral surface of the connecting shaft 13 and can rotate together with the rotation of the connecting shaft 13.

If the sleeve 150 is not applied to the connecting shaft 13, the plurality of oil seals 30 may be formed to directly surround the outer peripheral surface of the connecting shaft 13.

If the sleeve 150 is assembled with an interference fit to the connecting shaft 13, a plurality of oil seals 30 may be formed to surround the outer peripheral surface of the sleeve 150.

As such, the present invention includes both embodiments to which the sleeve 150 is applied as well as embodiments to which the sleeve 150 is not applied.

When the sleeve 150 is applied, the plurality of oil seals 30 are formed to surround the outer peripheral surface of the sleeve 150 assembled to surround the connecting shaft 13, and the sleeve 150 is connected to the reducer 10. It is located between the connecting shaft (13) and the oil seal (30).

Accordingly, the sleeve 150 protects the connecting shaft 13 to prevent excessive wear of the connecting shaft 13, and in case of emergency, only the sleeve 150 can be replaced with a new product. As a result, there is no need to replace or maintain the reducer 10 as a whole, thereby significantly shortening maintenance time and significantly reducing maintenance costs.

The bearing cover 110 may be coupled to the reducer body 11 by screwing.

The bearing cover 110 supports the bearing 20 surrounding the connecting shaft 13 inside the reducer body 11.

As a specific example, the bearing cover 110 includes a bearing cover body portion 111 and a bearing side support portion 112.

The bearing cover body portion 111 refers to a body portion that protrudes in a ring shape toward the front of the reducer body 11 when the bearing cover 110 is fastened to the reducer body 11.

The bearing side support portion 112 has the same outer diameter size as the bearing cover body portion 111, and has a certain length toward the rear of the bearing cover body portion 111 (i.e., the direction of insertion into the reducer main body 11). It is a circular tube-shaped part that extends as much as.

The bearing side support portion 112 serves to contact and support one side of the bearing 20 surrounding the connecting shaft 13 inside the reducer body 11.

In addition, the bearing cover 110 further includes a flange portion 113.

The flange portion 113 is a portion located between the bearing cover body portion 111 and the bearing side support portion 112 and extending in a circular band shape in the radial direction.

The bearing cover 110 is screwed to one side of the reducer body 11 and has a structure that allows for coupling and separation. The flange portion 113 has a plurality of fastening holes 1131 in the circumferential direction (see FIGS. 3 and 4). This can be provided.

The fastening screw 114 (see FIG. 3) may be screwed through the plurality of fastening holes 1131 provided in the flange portion 113 to couple the flange portion 113 to the reducer body 11.

Meanwhile, the bearing cover 110 may be configured to further include an inner diameter protrusion 1121 (see FIG. 4).

Referring to FIG. 4, the inner diameter protrusion 1121 refers to a protrusion-shaped portion that protrudes a predetermined length in the radial direction from the inner circumferential surface of the bearing cover body portion 111, that is, the inner diameter.

This inner diameter protrusion 1121 may support the oil seal 31 located on the inside (i.e., close to the bearing) among the plurality of oil seals 30 (31, 32). Accordingly, the position of the oil seal 31 can be stably maintained, thereby preventing the oil seal 31 from moving as much as possible, thereby providing a structure advantageous for preventing excessive wear of the oil seal area.

The oil supply hole 120 is a lubricant supply hole provided to supply lubricant (eg, grease, etc.) toward the oil seal 30.

The feeding hole 120 may be provided in the bearing cover 110.

As a specific example, referring to FIG. 7 , the feeding hole 120 may have a shape that penetrates the bearing cover body 111 in the radial direction on the outer peripheral surface of the bearing cover body 111.

To be more specific, as a preferred example, the paper feeding hole 120 may be configured to include a circular groove 121 and an internal flow path 122.

Here, the circular groove 121 refers to a groove recessed in the radial direction to have a predetermined height step on the outer peripheral surface of the bearing cover body portion 111.

The hole entrance 1201 of the paper feeding hole 120 may be formed at the center of the circular groove 121.

This circular groove 121 may serve as a connection port that connects the bearing cover 110 and a supply device that supplies lubricating oil (eg, grease, etc.) from the outside. Additionally, the circular groove 121 can help block external outflow of the lubricant being supplied when lubricating oil is supplied.

The internal flow path 122 penetrates from the hole inlet 1201 to the hole outlet 1202 formed on the inner peripheral surface of the bearing cover body 111, and supplies lubricant (e.g. grease, etc.) supplied to the hole inlet 1201 into the hole. A path for flow to the outlet 1202 is provided.

At this time, the hole outlet 1202 may be formed at a position facing the paper feed ring 130, which will be described later.

Accordingly, lubricating oil (eg, grease, etc.) supplied through the hole outlet 1202 and penetrating the bearing cover body 111 can be smoothly supplied to the upper part of the oil supply ring 130.

The oil supply ring 130 refers to a ring-shaped lubricant distribution member located between the plurality of oil seals 31 and 32 inside the bearing cover 110.

The feed ring 130 supplies lubricating oil (e.g. grease, etc.) supplied through the feed hole 120 between the plurality of oil seals 31 and 32 to the connection shaft 13 between the oil seals 31 and 32 or Lubricating oil (G) can be applied to the rotating part of the sleeve 150.

As a specific example, referring to FIG. 6, the paper feed ring 130 includes a paper feed ring body 131 and a plurality of side protrusions 134 and 135.

The paper feeding ring body portion 131 is a member having a ring shape. A plurality of oiling holes 133 may be formed in the paper feeding ring body 131.

The plurality of oiling holes 133 refer to holes formed through the paper feed ring body 131 at set intervals along the circumferential direction.

The plurality of oil holes 133 serve to supply lubricating oil (eg, grease, etc.) supplied through the hole outlet 1202 of the oil supply hole 120 between the plurality of oil seals 30 (31, 32).

The plurality of side protrusions 134 and 135 are respectively formed on both ends of the ring-shaped paper feeding ring body 131 and have a side wall shape blocking both sides of the paper feeding ring body 131.

Accordingly, a ring-shaped groove 132 may be formed in the upper part of the paper feeding ring body 131. These ring-shaped grooves 132 are filled with lubricating oil (e.g., grease, etc.) supplied through the feeding hole 120, and then the lubricating oil (e.g., grease, etc.) passes through the plurality of lubricating holes 133 to the feeding ring body portion. After flowing to the lower part of (131), it can be smoothly supplied to the rotating portion between the oil seals (31, 33).

As a specific example, each of the side protrusions 134 and 135 may have an inner diameter size smaller than the inner diameter size of the feed ring body 131 and an outer diameter size larger than the outer diameter size of the feed ring body 1310. You can have it.

In this way, each of the side protrusions 134 and 135 is provided in a partition shape at both ends of the paper feeding ring body 131 to form a ring-shaped groove 132 through the upper and lower surfaces of the paper feeding ring body 131. You can. The ring-shaped groove 132 continuously supplies lubricating oil and evenly distributes it between the plurality of oil seals 31 and 32. As a result, the rotating portion between the plurality of oil seals 31 and 32 is well lubricated and excessive wear can be prevented.

Referring to FIG. 7, the lubricant (G) supplied through the feeding hole 120 formed in the bearing cover 110 is supplied to the feeding ring 130, and then is supplied to the connecting shaft 13 or sleeve through the feeding ring 130. It is evenly distributed to the plurality of oil seals (31, 33) located at (150), showing stable oiling.

Meanwhile, the oil seal wear prevention device 100 of a crane hoist reducer according to an embodiment of the present invention further includes an oil seal cover 140.

The oil seal cover 140 refers to a cover member fastened to the front of the bearing cover 110, more specifically, the bearing cover body 1110 to protect the oil seals 30 (31, 32).

In particular, the oil seal cover 140 may support the oil seal 32 located on the outside among the plurality of oil seals 31 and 33.

As a specific example, the oil seal cover 140 may be configured to include an oil seal cover body portion 141 and a support step portion 142.

The oil seal cover body 141 is fastened to the front of the bearing cover body 111 and blocks the oil seals 31 and 32 from being exposed to the outside.

The support step portion 142 is a cross-direction extending portion inserted by a predetermined length from the oil seal cover body portion 141 toward the inner circumferential surface of the bearing cover body portion 111, and is located at the front end of the bearing cover body portion 111. Specifically, the front end of the inner peripheral surface of the bearing cover body portion 111 is seated and supported.

Accordingly, among the plurality of oil seals (30: 31, 32), the oil seal 32 located on the outside is laterally supported by the support step 142 of the oil seal cover 140, and the oil seal 31 located on the inside is supported at the same time. ) may be supported on the side by the inner diameter protrusion 1121.

As a result, the oil seal 30 is firmly fixed in the set position and at the same time, sufficient lubricating oil (eg, grease, etc.) can be supplied, thereby preventing excessive wear of the oil seal area.

As described above, according to the structure and operation of the present invention, excessive wear can be prevented by applying lubricant to the contact area between the connecting shaft and the oil seal portion of the crane hoist reducer.

Furthermore, according to the structure and operation of the present invention, the connecting shaft of the reducer is protected by inserting a sleeve between the reducer connecting shaft and the oil seal portion, and when the sleeve is excessively worn, the sleeve can be quickly and easily replaced with a new product. Accordingly, maintenance time can be shortened and costs can be reduced.

Furthermore, according to the configuration and operation of the present invention, stable management and operation of the crane hoist reducer is possible, contributing to improved facility reliability and productivity.

As described above, the present invention has been described with reference to the illustrative drawings, but the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformation can occur. In addition, although the operational effects according to the configuration of the present invention were not explicitly described and explained in the above description of the embodiments of the present invention, it is natural that the predictable effects due to the configuration should also be recognized.

10: reducer
11: Reducer body
13: connecting shaft
20: Bearing
30 (31, 32): Oil seal
100: Oil seal wear prevention device of crane hoist reducer
110: Bearing cover
111: Bearing cover body part
112 Bearing side support
1121: inner protrusion
113: Flange part
1131: fastening hole
114: fastening screw
120: paper feeding hole
1201: Hall entrance
1202: Hall exit
121: circular groove
122: Internal flow path
130: paper feed ring
131: Feed ring body part
132: Ring-shaped groove
133: Doyu Hall
134, 135: side protrusion
140: Oil seal cover
141: Oil seal cover body part
142: Support step part
150: sleeve

Claims (13)

Reducer body;
a connecting shaft that protrudes from the reducer body at a certain length and outputs rotational force reduced at a set reduction ratio to the outside;
a bearing coupled to surround the connecting shaft inside the reducer body; and
a plurality of oil seals surrounding the outer peripheral surface of the connecting shaft at a position close to the bearing;
A device for preventing wear of the oil seal of a crane hoist reducer, comprising:
a bearing cover fastened to the reducer body and supporting the bearing;
a feeding hole provided in the bearing cover and supplying lubricating oil toward the oil seal; and
a feed ring located between the plurality of oil seals inside the bearing cover and supplying lubricating oil supplied through the feed hole between the plurality of oil seals;
A device for preventing wear of the oil seal of a crane hoist reducer, including a device.
According to paragraph 1,
The bearing cover is,
A bearing cover body portion that protrudes forward of the reducer body when fastened to the reducer body and has a ring shape; and
a bearing side support portion that has the same outer diameter size as the bearing cover body portion, extends rearward of the bearing cover body portion, and contacts and supports a side surface of the bearing;
A wear prevention device for the oil seal of a crane hoist reducer including a.
According to paragraph 2,
The bearing cover is,
a flange portion located between the bearing cover body portion and the bearing side support portion, extending in the radial direction, and having a plurality of fastening holes for fastening fastening screws to the reducer body;
A wear prevention device for the oil seal of a crane hoist reducer further comprising a.
According to paragraph 2,
The paper feeding hole is,
Formed to penetrate the bearing cover body in the radial direction on the outer peripheral surface of the bearing cover body.
A device to prevent wear on the oil seal of a crane hoist reducer.
According to clause 4,
The paper feeding hole is,
a circular groove formed on the outer circumferential surface of the bearing cover body to have a predetermined height difference, and a hole entrance formed through the center; and
an internal flow path that passes from the hole inlet to the hole outlet formed on the inner peripheral surface of the bearing cover body portion and flows the lubricating oil supplied to the hole inlet to the hole outlet;
A wear prevention device for the oil seal of a crane hoist reducer including a.
According to clause 5,
The hall exit is,
Located to face each other with the paper feed ring,
The lubricant supplied through the hole outlet is supplied to the upper part of the feed ring.
A device to prevent wear on the oil seal of a crane hoist reducer.
According to clause 5,
The paper feed ring is,
An oil supply ring body portion having a ring shape and having a plurality of oiling holes that are formed through the circumferential direction at set intervals to supply the lubricating oil supplied through the hole outlets between the plurality of oil seals; and
a plurality of side protrusions formed to block both sides of the feed ring body and forming ring-shaped grooves through the upper and lower portions of the feed ring body;
A device for preventing wear of the oil seal of a crane hoist reducer, including a device.
In clause 7,
The plurality of side protrusions,
It has an inner diameter size that is smaller than the inner diameter size of the feeding ring body,
Having an outer diameter size larger than the outer diameter size of the feed ring body portion
A device to prevent wear on the oil seal of a crane hoist reducer.
According to paragraph 2,
an oil seal cover fastened to the front of the bearing cover body and supporting an oil seal located on an outer side of the plurality of oil seals;
A wear prevention device for the oil seal of a crane hoist reducer further comprising a.
According to clause 9,
The oil seal cover is,
An oil seal cover body part fastened to the front of the bearing cover body part; and
a support step portion that is inserted at a set length from the oil seal cover body toward the inner peripheral surface of the bearing cover body and seats the front end of the bearing cover body;
A wear prevention device for the oil seal of a crane hoist reducer including a.
According to paragraph 1,
a sleeve coupled to surround the connecting shaft and rotating together with the connecting shaft;
A wear prevention device for the oil seal of a crane hoist reducer further comprising a.
According to clause 11,
The sleeve is,
Coupled with an interference fit to the outer circumferential surface of the connecting shaft
A device to prevent wear on the oil seal of a crane hoist reducer.
According to clause 12,
The plurality of oil seals are,
Located to surround the outer peripheral surface of the sleeve
A device to prevent wear on the oil seal of a crane hoist reducer.

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