JP2012057672A - Series of rotating device, additional unit of rotating device, and sealing device of rotating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To totally inexpensively manufacture a plurality of kinds of rotating devices different from each other in the number of oil seals.SOLUTION: In a series of rotation devices wherein first and second members A and B are relatively rotated, the series of the rotation devices includes first and second rotation devices X and Y. On the other hand, the first rotation device X includes a first seal device J wherein n oil seals On are disposed between the first and second members A and B. The second rotation device Y includes a second seal device K which includes the first and second members A and B common to the first seal device J and a connection member C connected to the first member A and rotated integrally with the first member A and wherein n oil seals On are disposed between the first and second members A and B and m oil seals Om are disposed between the connection member C and the second member B.

Description

  The present invention relates to a series of rotating devices, an additional unit for rotating devices, and a sealing device for rotating devices.

  Patent Document 1 discloses a reduction gear (rotating device).

  The speed reduction device is provided with a casing (first member) and a flange (second member) for taking out the reduced speed rotation. The flange is disposed on the inner periphery of the casing and rotates relative to the casing. An oil seal is disposed between the casing and the flange, and seals between the casing and the flange. Patent Document 1 discloses an example in which the number of oil seals is one and two, but the shape of the casing is different in each example.

JP 2009-85267 A (FIGS. 1 and 4)

  Manufacturers of reduction gears must manufacture reduction gears with different numbers of oil seals according to demands that require different sealing performances depending on the use conditions, environment, etc. of the reduction gears.

  However, conventionally, when the number of oil seals to be incorporated is different, the space occupied by the oil seals is different, so that the speed reducer itself including the casing has been individually designed and manufactured. Therefore, as a result, a plurality of types of reduction gears are designed and manufactured according to the number of oil seals, and the total manufacturing cost of these reduction gears (as a whole series) is increased.

  In the present invention, in order to solve the above problem, even if the number of oil seals to be incorporated is different, it is possible to manufacture a plurality of types of rotating devices that can incorporate these different numbers of oil seals at a lower cost in total. Let it be an issue.

  The present invention relates to a series of rotating devices in which the first member and the second member rotate relatively, and the series of rotating devices includes a first rotating device and a second rotating device, and the first rotating device includes: And a first seal device in which n oil seals are disposed between the first member and the second member, and the second rotating device includes the first seal device common to the first seal device. A second member and a connecting member connected to the first member and rotating integrally with the first member, and the n oil seals are provided between the first member and the second member. The above-mentioned problem has been solved by a configuration including a second seal device that is disposed and m oil seals are disposed between the connection member and the second member.

  The series of rotating devices in which the first member and the second member rotate relative to each other according to the present invention includes a first rotating device having n oil seals and a second rotating device having n + m oil seals.

  The first rotating device includes a first seal device in which n oil seals are disposed between the first member and the second member. In the second rotating device, n oil seals are arranged between the first member and the second member common to the first sealing device, and m oils are provided between the connecting member and the second member. A second sealing device is provided in which a seal is disposed.

  The series of rotating devices including the first and second rotating devices can be obtained by simply adding an additional unit including a connecting member and m oil seals to the n first rotating devices. N + m second rotating devices can be manufactured. In other words, a rotating device of a type in which the number of oil seals is different is manufactured by sharing the first and second members for both the first and second rotating devices constituting the series and simply detaching the additional unit. Can do. Thereby, even if the number of oil seals is different, the plurality of types of rotating devices can share many members including the first and second members, and thus the total manufacturing cost of the entire series can be reduced.

  The number n of the oil seals may be zero. That is, n is an integer greater than or equal to 0 (n ≧ 0). On the other hand, the number m of oil seals to be added is an integer of 1 or more (m ≧ 1). This will be described later.

  From the above viewpoint, the present invention can also be regarded as a concept of “a new unit for adding a new oil seal”. That is, the present invention is an additional unit used in addition to a rotating device in which the first member and the second member rotate relatively, the connecting member connected to the first member, the connecting member and the It can also be understood that the invention includes a connection mechanism that connects the first member, and an oil seal disposed between the connection member and the second member.

  Further, if attention is paid to the configuration of the second rotating device (in the series), the present invention is connected to the first member in the sealing device of the rotating device in which the first member and the second member rotate relatively. A connecting member that rotates integrally with the first member, an oil seal between the first member and the second member, and an oil seal disposed between the connecting member and the second member; It can also be regarded as an invention.

  Here, the “oil seal” may be any seal member that can prevent leakage of the lubricant from the inside of the apparatus, and the shape of the oil seal itself and the manner of incorporation into the apparatus are not particularly limited. That is, not only the so-called oil seal itself arranged alone, but also a seal member incorporated in a seal bearing, for example, is included in the concept of the oil seal as described later.

  According to the present invention, a plurality of types of rotating devices having different numbers of oil seals can be manufactured at a low cost.

Conceptual diagram of a series of rotating devices in the present invention The longitudinal cross-sectional view of the 2nd reduction gear device concerning embodiment of this invention Enlarged view of arrow III in FIG. The enlarged view of the 1st sealing device with which the 1st reduction gear device concerning the embodiment of the present invention was equipped. The enlarged view of the 2nd sealing device with which the 2nd reduction gear device concerning other embodiments of the present invention was equipped.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  First, in order to facilitate understanding of the whole, the concept of the series of the rotating device will be described.

  FIG. 1 is a conceptual diagram of a series of rotating devices according to this embodiment.

  The series of rotating devices includes a first rotating device X and a second rotating device Y.

  The first rotating device X includes a first sealing device J in which n oil seals On are arranged between the first member A and the second member B. Reference numeral G denotes a rotation mechanism (for example, a speed reduction mechanism) that is originally provided in the first rotation device X.

  In the second rotating device Y, n oil seals On are arranged between the first member A and the second member B, and m oil seals Om are arranged between the connecting member C and the second member B. A second sealing device K is provided. Moreover, the same original rotation mechanism G as the 1st rotation apparatus X is provided. That is, the second sealing device K includes first and second members A and B and a rotation mechanism G that are common to the first sealing device J.

  In the present embodiment, the second rotating device Y is a device in which an additional unit Z is added to the first rotating device X. The additional unit Z referred to here is the connection member C connected to the first member A, the connection mechanism D connecting the connection member C and the first member A, the connection member C and the second member B. The oil seal Om is disposed between the two units.

  Since the additional unit Z is an independent unit for “adding” the oil seal, the connecting mechanism D is an essential component of the additional unit Z as a means for connecting the connecting member C and the first member A. is there. However, if this series is constructed as a series of the first rotating device X and the second rotating device Y from the beginning (without using the additional unit Z), the connecting member C and the first member A are not necessarily the additional unit. It is not necessary to be connected using an independent connection mechanism such as the connection mechanism D of Z. For example, when there is a member F that rotates integrally with the first member A in the first rotating device X, the first member A and the connecting member are indirectly connected by connecting the connecting member C to the member F. A configuration in which C is connected may be adopted. In other words, from the viewpoint of the second rotating device Y constituting a part of the series, in short, the relationship that the connecting member C is integrally connected to the first member A as a result is satisfied. It's enough. That is, the second rotating device Y does not necessarily have to have the connection mechanism D independent of the first rotating device X.

  Hereinafter, a more specific configuration of the first and second reduction gears 100 and 200 (first and second rotation devices X and Y in FIG. 1) constituting the series of reduction gears (rotation devices) will be described.

  In the present embodiment, since the second reduction gear 200 includes all the components of the first reduction gear 100 and the additional unit 162, FIG. 2 depicting the second reduction gear 200 and its enlarged main part for convenience of explanation. This will be described with reference to FIG. Regarding the first reduction gear 100, the main part of the first reduction gear 100 is shown enlarged in FIG.

  The configuration of the speed reduction mechanism 103 (rotation mechanism G in FIG. 1) common to the first and second speed reduction devices 100 and 200 will be briefly described later. Here, the configuration of the series will be mainly described.

  This series of reduction gears is a series of reduction gears in which the casing 122 (first member A in FIG. 1) and the flange body 132 (second member B in FIG. 1) rotate relatively. The second reduction gear 200 is provided.

  As shown in FIGS. 2 and 4, the first reduction gear 100 (reference numeral X in FIG. 1) constituting a part of this series includes a casing 122 (first member A in FIG. 1) and a flange body 132 (FIG. 1 (second member B), n first oil seals 150 (oil seal On in FIG. 1) are arranged (n = 1 in this example: n = 1 in this example). 1).

  On the other hand, as shown in FIGS. 2 and 3, the second reduction gear 200 (reference numeral Y in FIG. 1) is added to the first reduction gear 100 (reference numeral X in FIG. 1) with an additional unit 162 (reference numeral Z in FIG. 1). ).

  The additional unit 162 (symbol Z in FIG. 1) is a unit that is used in addition to the first reduction gear 100, and includes a connection member 156 (symbol C in FIG. 1) connected to the casing 122, and the connection member 156. Connecting mechanism 153 (reference numeral D in FIG. 1) for connecting the casing 122 to the casing 122, and m (one in this example: m = 1) second oil seals arranged between the connecting member 156 and the flange body 132. 152 (oil seal Om in FIG. 1).

  The additional unit 162 is added to the first reduction gear 100 by connecting the casing 122 of the first reduction gear 100 and the connection member 156 via the connection mechanism 153, and the second unit 162 is connected between the flange body 132 and the connection member 156. An oil seal 152 can be added.

  The connection mechanism 153 (reference numeral D in FIG. 1) of the additional unit 162 is for connecting the connection member 156 (reference numeral C in FIG. 1) to the casing 122 (first member A in FIG. 1). 162 is provided, but there may be a case where a more reliable connection can be achieved if some of the components are on the casing 122 side in terms of the function of the connection mechanism. Also in this embodiment, the connection mechanism 153 includes a bolt hole 154 provided in the casing 122, a through hole 155 provided in the connection member 156, and a bolt 158 screwed into the bolt hole 154 via the through hole 155. A part of the connection mechanism 153 (bolt hole 154) is provided on the casing 122 side.

  The second reduction gear device 200 (reference symbol Y in FIG. 1) of the present embodiment is obtained by adding an additional unit 162 (reference symbol Z in FIG. 1) to the first seal device 101 (reference symbol J in FIG. 1) of the first reduction gear device 100. A second sealing device 201 (reference numeral K in FIG. 1) is provided.

  That is, the second sealing device 201 (reference numeral K in FIG. 1) of the second reduction gear 200 is connected to the casing 122 and the casing 122 in common with the first sealing device 101, and rotates integrally with the casing 122. And n (1 in this example as described above) first oil seals 150 are disposed between the casing 122 and the flange body 132, and the connection member 156 M (one in this example) second oil seals 152 are arranged between the flange bodies 132.

  The second seal device 201 of the second reduction gear device 200 includes a first oil seal 150 between the casing 122 and the flange body 132 and also between the connection member 156 and the flange body 132 if viewed from a different viewpoint. It can also be said that the second oil seal 152 is a sealing device.

  In the present embodiment, in the second reduction gear 200, a part of the second oil seal 152 disposed between the connection member 156 and the flange body 132 is the casing 122 (which is the first member) and the (first member). It also enters between the flange bodies 132 (which are two members). Specifically, the first oil seal 150 is disposed so as to enter the bearing 136 side with respect to the axial end surface P of the casing 122, and the tip of the outer peripheral portion 152 </ b> C of the second oil seal 152 is located at the first oil seal 150. Is in contact with the axially outer side surface.

  The first and second oil seals 150 and 152 have a so-called double lip structure including main lip portions 150A and 152A and dust lip portions 150B and 152B. The main lip 150A of the first oil seal 150 is provided on the bearing 136 side (in the axial direction) of the first oil seal 150. The main lip 150A prevents the lubricant inside the second reduction gear 200 from leaking from the second reduction gear 200 into the atmosphere. The dust lip 150 </ b> B is provided on the outer space side (axially outer side) of the first oil seal 150. The dust strip 150B prevents foreign matter from entering from the atmosphere side.

  Note that the first and second reduction gears 100 and 200 are also common to the reduction gear mechanism 103 (the rotation mechanism G in FIG. 1) that performs the original functions of the first and second reduction gears 100 and 200. In the present invention, the specific configuration of the rotation mechanism of the first and second rotating devices is not particularly limited, but here, it is specifically adopted in the first and second reduction gears 100 and 200 in the present embodiment. The configuration of the speed reduction mechanism 103 is briefly described as follows.

  When the input shaft 102 is rotated, the three eccentric body shafts (only one is shown) 108 are simultaneously decelerated and rotated by the meshing of the transmission pinion 104 and three sorting gears (only one is shown) 106. The rotation of each eccentric body shaft 108 rotates the first and second eccentric bodies 110 and 112 in the same phase, and the first and second external gears 114 and 116 via the first and second rollers 140 and 142. Is transmitted to. As a result, the first and second external gears 114 and 116 rotate and rotate while being inscribed in the internal gear 118. The internal gear 118 is fixed (integrated) with the casing 122 (corresponding to the first member A in FIG. 1) described above. For this reason, when the first and second external gears 114 and 116 swing and rotate, the meshing position between the first and second external gears 114 and 116 and the external pin 120 which is the internal tooth of the internal gear 118 is changed. Move sequentially. By the movement of the meshing position, the phases of the first and second external gears 114 and 116 are shifted by an amount corresponding to the difference in the number of teeth with respect to the internal gear 118 that is integrated with the casing 122 and is in a fixed state ( Rotate) Therefore, the eccentric body shaft 108 revolves around the axis of the second reduction gear device 200 at a speed corresponding to the rotation component, and a pair of flange bodies 130 and 132 connected by carrier pins (only one shown) 138 are provided. Rotate together at a speed corresponding to the revolution speed. The flange body 132 of the pair of flange bodies 130 and 132 is a member corresponding to the second member B of FIG.

  The speed reduction mechanism 103 according to this embodiment has such a configuration, and is common to the first and second speed reduction devices 100 and 200.

  Next, the operation of the series of the first and second reduction gears 100 and 200 will be described.

  Conventionally, when the number of oil seals to be incorporated is different, the space occupied by the oil seals is different. Therefore, the speed reducer itself including the casing has been individually designed and manufactured. Therefore, as a result, a plurality of types of reduction gears are designed and manufactured according to the number of oil seals, and the total manufacturing cost of the entire series of these reduction gears has increased.

  However, according to the series of the first reduction gear device 100 and the second reduction gear device 200 according to the present embodiment, only the additional unit 162 is added to the first reduction gear device 100 including one first oil seal 150. Thus, the second reduction gear device 200 including the two first and second oil seals 150 and 152 can be manufactured. Thereby, two types of first and second reduction gears 100 and 200 having different numbers of oil seals can be manufactured by adding and removing the additional unit 162, and many members including the casing 122 and the flange body 132 can be manufactured. Can be shared. In particular, since the casing 122 and the flange body 132 are heavy members and require expensive mold costs, if these members can be shared, the total manufacturing cost can be greatly reduced as a result. .

  In the embodiment, a part (outer peripheral portion 152 </ b> C) of the second oil seal 152 disposed between the connection member 156 and the flange body 132 also enters between the casing 122 and the flange body 132. Accordingly, the second oil seal 152 is connected to the connecting member 156 and the casing (rather than disposing the second oil seal 152 along the axial end surface P of the casing 122 at the tip of the outer peripheral portion 152C of the second oil seal 152). It becomes easy to prevent the lubricant from leaking between 122.

  Further, the casing 122 (first member A in FIG. 1) includes a bolt hole 154 that constitutes a part of the connection mechanism 153 (connection mechanism D in FIG. 1), so that a more robust connection mechanism is configured. The connection member 156 can be stably supported on the casing 122.

  In addition, when the user enhances the sealing capability, the user only needs to purchase the additional unit 162 without purchasing the second reduction gear 200 separately, so the sealing capability of the reduction gear can be enhanced at a low cost. Also in this case, since the bolt hole 154 is previously opened in the casing 122, the additional unit 162 can be easily added on site. For example, when the material of the first oil seal 150 is glass fiber, the first oil seal 150 may be easily worn. Therefore, from the viewpoint of preventing the leakage of the lubricant, the additional unit 162 is attached. The actual profit that can enhance the sealing ability at low cost is great.

  Next, another embodiment will be described.

  The speed reducer series according to the present embodiment includes a first speed reducer 300 with one oil seal and a second speed reducer 400 with two oil seals. In FIG. 5, a configuration including the additional unit 362, that is, a depiction corresponding to the second reduction gear 400 is made.

  In the present embodiment, a first sealing device 301 common to the first and second reduction gears 300 and 400 includes a casing 322 (corresponding to the first member A in FIG. 1) and a flange body 332 (corresponding to the second member B in FIG. 1). ) Between the bearings 370. The bearing 370 is a seal bearing, and a seal member 370A composed of first and second seal pieces 370A1 and 370A2 incorporated in the bearing 370 is the oil seal On shown in FIG. Seal). The seal member 370A inside the bearing 370 contributes to the sealing between the casing 322 and the flange body 332, and prevents the lubricant from leaking from the inside of the second reduction gear 400 to the external space. Specifically, the inner and outer rings 370B and 370C of the bearing 370 and the seal member 370A are sealed. That is, the number of oil seals arranged between the casing 322 and the flange body 332 is 1 (n = 1). In this case, the first and second seal pieces 370A1 and 370A2 are on both sides in the axial direction of the bearing 370, but both are regarded as one seal member 370A. In general, the sealing performance of the sealing member arranged inside the seal bearing is inferior to that of a single so-called oil seal. However, if the sealing performance required by the consumer is satisfied, the first member and the second member A single so-called oil seal is not necessarily disposed between the members. On the other hand, for example, hard grease is used as a lubricant, making it difficult for the inside of the rotating device to move, and the first and second members constitute a labyrinth structure to prevent grease from leaking from the rotating device to the external space. A configuration in which an oil seal is not particularly arranged is also conceivable. Such a case corresponds to the case of n = 0 in the present invention. Note that the number m of oil seals to be added to the second rotating device is an integer equal to or greater than 1 (m ≧ 1) because the purpose is to add oil seals.

  Also in this embodiment, the casing 322 and the flange body 332 are shared, and the two types of first and second reduction gears 300 and 400 having different numbers of oil seals can be manufactured only by detaching the additional unit 362. Thereby, the two types of first and second reduction gears 300 and 400 having different numbers of oil seals can be manufactured at a low cost in total.

  The configurations of the additional unit 362 and the second reduction gear 400 are substantially the same as those in the previous embodiment. Therefore, since it is basically the same as the structure of the first and second reduction gears 100 and 200 of the previous embodiment, the portion corresponding to the first and second reduction gears 100 and 200 (functionally similar portion) is provided. , The last two digits are given the same reference numerals, and the duplicate description is omitted.

  In the additional unit of the rotating device according to the present invention, the connecting member may be constituted by a counterpart member into which the rotating device is incorporated. As a result, the wall surface or the like of the mating member into which the rotating device is incorporated can be used as a connecting member, and there is no need to prepare a connecting member separately, and the rotating device is incorporated while fusing the additional unit with the mating member. The entire device can be made compact. For example, when a rotating device is incorporated into a robot arm, if a part of the wall surface of the robot arm is used as a connection member, the connection to the robot arm is prevented more reliably while preventing leakage of lubricant. The amount corresponding to the space of the member can make the entire robot arm lighter and more compact.

  In the embodiment of FIG. 5, the types of oil seals arranged between the first member and the second member and the oil seals arranged between the connection member and the second member are different. As described above, by combining oil seals having different shapes, materials, strengths, and the like, it is possible to easily design or change an optimal seal device according to various environments. Other examples of employing different types of oil seals include, for example, proper use of an oil seal disposed between the first member and the second member and an oil seal disposed between the connection member and the second member. When the temperatures are different from each other, the temperature range in which each oil seal can function well as a whole is expanded, and a wide range of temperatures can be handled. As a result, the rotating device can be widely used in an environment where a sudden temperature change or a wide temperature change occurs.

  Furthermore, the connection mechanism may be any mechanism that can connect the connection member to the first member, and the configuration does not have to be a bolt and a bolt hole. For example, a fitting structure using unevenness, a crimping mechanism that press-fits the connection member into the first member, another mounting mechanism, or the like may be used. In the above embodiment, the first member includes a part of the connection mechanism for connecting the connection member to the first member, thereby making the function of the connection mechanism more reliable. One member may not have any components of the connection mechanism. For example, the connecting member may be covered so as to overlap the outer periphery of the first member, and a bolt that penetrates the connecting member in the radial direction may be screwed and pressed from the outside in the radial direction of the first member. When the first member does not have any components of the connection mechanism, the first rotating device can have a more independent design (without a bolt hole or the like for connecting the connection member) as a product.

  As long as the seal member can prevent the lubricant from leaking from the inside of the rotating device, the structure, shape, size, material, and manner of incorporation into the device are not limited to the oil seal shown in the above embodiment. In addition, for example, regarding the structure of a so-called oil seal arranged alone, it is of the double lip structure (main lip and dust lip) shown in the above embodiment, but is not limited to this, The oil seal may be a triple lip structure provided with an auxiliary lip, or may be a single lip structure oil seal obtained by removing the dust lip from the double lip structure.

  In the above embodiment, one oil seal is disposed between the first member and the second member, and between the connection member and the second member (n, m = 1), but this is not a limitation. Two or more oil seals may be arranged between the first member and the second member, and between the connection member and the second member (n and m may be integers of 2 or more). . Furthermore, as described above, the oil seal between the first member and the second member is not necessarily arranged (n may be 0).

  Moreover, in the said embodiment, although a part of oil seal arrange | positioned between a connection member and a 2nd member has penetrated between the 1st member and the 2nd member, it is not necessarily the 1st member and the 2nd member. You don't have to go in between.

  In the above embodiment, the speed reducer is used as the rotating device. However, the present invention is not limited to this, and the rotating device may be applied to other rotating devices as long as the first member and the second member rotate relative to each other. good. Moreover, in the said embodiment, although the 1st, 2nd member of the rotating apparatus was a casing and a flange body, respectively, if it is a member which rotates relatively, it may be another member.

  Further, an O-ring, a seal rubber, or the like may be disposed between the opposing end surfaces of the first member and the connection member. Thereby, the lubricant inside the rotating device can be further prevented from leaking from between the first member and the connecting member.

  Further, as already described with reference to FIG. 1, if this series is constructed as a series of the first rotating device and the second rotating device from the beginning without using the “additional unit”, the connecting member and the first The members do not necessarily have to be connected using an independent connection mechanism. For example, when there is a member that rotates integrally with the first member in the first rotating device, the connecting member is connected to this member. By doing so, the first member and the connecting member may be connected (indirectly).

100 (X) ... 1st rotation apparatus (1st reduction gear)
101 (J): first sealing device 122 (A): first member (casing)
132 (B) ... 2nd member (flange body)
150 (On): an oil seal (first oil seal) disposed between the first member and the second member
152 (Om): Oil seal (second oil seal) disposed between the connecting member and the second member
156 (C) ... connecting member 200 (Y) ... second rotating device (second reduction gear)
201 (K): second sealing device n: number of oil seals arranged between the first member and the second member m: number of oil seals arranged between the connecting member and the second member

Claims (7)

In the series of rotating devices in which the first member and the second member rotate relatively,
The series of rotating devices includes a first rotating device and a second rotating device,
The first rotating device includes a first seal device in which n oil seals are disposed between the first member and the second member,
The second rotating device includes the first and second members common to the first sealing device, and a connecting member connected to the first member and rotating integrally with the first member, and A second seal device in which the n oil seals are disposed between the first member and the second member, and m oil seals are disposed between the connection member and the second member; A series of rotating devices characterized by In claim 1,
The first member includes a part of a connection mechanism for connecting the connection member to the first member. In claim 1 or 2,
The rotating device series, wherein the connecting member is constituted by a counterpart member into which the rotating device is incorporated. In any one of Claims 1-3,
A series of rotating devices, wherein the oil seal disposed between the first member and the second member differs from the oil seal disposed between the connecting member and the second member. In any one of Claims 1-4,
A part of the oil seal disposed between the connection member and the second member also enters between the first member and the second member. An additional unit used in addition to a rotating device in which the first member and the second member rotate relatively,
A connection member connected to the first member; a connection mechanism connecting the connection member and the first member; and an oil seal disposed between the connection member and the second member. An additional unit of a rotating device, characterized in that. In the sealing device of the rotating device in which the first member and the second member rotate relatively,
A connecting member connected to the first member and rotating integrally with the first member;
An oil seal is provided between the first member and the second member, and an oil seal is also disposed between the connection member and the second member.

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