FRAME STRUCTURE OF AN ENGINE

Abstract

Frame structure (12) of an engine (M1) comprising the following: a cover (16) on the load side and a cover (18) opposite the load side, between which a main frame body (14) is inserted, wherein the cover (16) of the load side and the cover (18) opposite the load side each have seats (22, 24) for fastening a through bolt (26), wherein the main frame body (14), the load-side cover (16) and the cover (18) opposite the load-side are connected to each other by the through bolt (26) via the seats (22, 24), wherein the main frame body (14) has a padding part (28) between the seats (22, 24) to attach separate links (60, 70) to the main frame body (14), wherein the filling part (28) has a through hole (28A) for inserting the through screw (26), and wherein a plurality of threaded holes (54) are formed for fastening the separate links (60, 70) in the liner part (28).

Description

Background of the invention; Field of the invention

[0001] The present invention relates to a frame structure of an engine. Description of the related technique

[0002] In JP 2003 - 143 806 A ( Fig. 3) A geared motor is disclosed in which a motor and a reduction gear are integrally assembled. The motor in the geared motor has a frame structure in which a cover on the load side and a cover opposite the load side are separately provided by inserting a main frame body.

[0003] Mounting points for a through bolt are located on both the load-side cover and the cover opposite the load-side. The main frame body, the load-side cover, and the cover opposite the load-side are connected to each other via the through bolt through these mounting points.

[0004] A cooling fan is located on the outside of the cover, opposite the load side in the axial direction, and the cooling air generated by the fan allows the main frame body to be cooled. A foot is attached to the motor for mounting it to a floor or the base of an industrial machine, or an eye bolt is attached to the motor for suspending it.

[0005] However, if a padding part is arranged on the main frame body to accommodate the foot or eye bolt, it is assumed that a smooth flow of cooling air from the cooling fan will be obstructed and the cooling performance will be degraded to that extent.

[0006] Particularly in a structure where the main frame body, the load-side cover, and the cover opposite the load-side are fastened using a through bolt (since the through bolt runs the entire length of the main frame body and must be loosened during disassembly), the filler piece is shaped to accommodate the through bolt. Consequently, the effect of this is likely to be particularly pronounced.

[0007] From DE 10 2008 028 656 U1, an electric motor is known which comprises a housing, a stator, a rotor and a fan, wherein the rotor comprises a rotor assembly and a shaft which has sections with different diameters separated by shaft diameter steps, wherein a fixed bearing in a flange shield of the housing and a floating bearing in a bearing shield of the housing support the shaft, wherein the stator is mounted in a stator housing of the housing, wherein the fan comprises a fan hood, wherein the fan hood comprises in the axial direction a first fan hood section with a circumferential surface which is continuously curved and in the axial direction a second fan hood section with a further circumferential surface which has at least one section which is not curved in the circumferential direction.wherein the first fan housing section surrounds a fan wheel with a drive and the further fan housing section is at least partially overlapping and placed over a housing of the electric motor.

[0008] JP S58-90052 U discloses a frame structure for an engine comprising: a load-side cover and a cover opposite the load-side, between which a main frame body is inserted, the load-side cover and the cover opposite the load-side being fastened to each other by means of through bolts. A rubber component with a through-hole, through which the through bolt extends, is provided to reduce vibration of the through bolt.

[0009] JP S63-131566 U relates to a rotating electric machine. The rotating electric machine has a frame made of a cylindrical steel plate and a bracket that is detachably attached to both side openings of the frame and is equipped with bearings for holding a rotating shaft. The rotating electric machine also has a bolt seat attached to the frame for securing the bracket to the frame. A lifting tool can be attached to the bolt seat.

[0010] US Patent 2005-0264115A1 discloses an engine casing consisting of a cylinder with fins on its outer surface, resting on the base of the outer surface for horizontal mounting of the engine on a predetermined plane. A rear cover is mounted to the rear end of the cylinder and has a central axle hole. A front cover is mounted to the front end of the cylinder and also has a central axle hole. A windshield with a larger diameter than the cylinder is detachably attached to the front cover. The windshield has mounting holes for vertical mounting of the engine on a predetermined plane. Summary of the invention

[0011] The present invention was made in view of such a problem in the related technology and aims to provide a frame structure of an engine which makes it possible to form a support part in order to attach a separate element, such as a foot or eye bolt, without impairing the cooling performance.

[0012] The present invention is configured to solve the problem described above by providing a frame structure for an engine with the features of claim 1. Preferred embodiments of the invention are set forth in the dependent claims.

[0013] The present invention focuses in particular on a place where the through bolt is installed to connect the cover of the load side and the cover opposite the load side, as a place (a position) where a lining part is formed in the main frame body.

[0014] As described above, the filler element was formed in a position that avoids the through-bolt used in the related technique. However, since the through-bolt is installed using two seats: one on the load-side cover and the other opposite the load-side cover, the area between the seats is naturally not sufficiently exposed to the cooling air of a cooling fan. The present invention addresses this issue and aims to arrange the filler element between the seats in a specific way to accommodate the separate links.

[0015] To facilitate this arrangement, the filler part according to the present invention includes a through-hole for inserting the through-bolt (to avoid interference from the through-bolt). Consequently, it is possible to install and remove the through-bolt by inserting it into the through-hole of the filler part without any obstruction, regardless of the presence of the filler part.

[0016] On the other hand, since the filler element is formed between the seats of the through bolt, it is not necessary to form the filler element in a different location (where it is formed in the prior art). Accordingly, the cooling air from the cooling fan can be ensured to flow smoothly (in a state without any obstructions) around the main frame body. As a result (compared to the situation in the prior art, where the filler element is formed in a position that obstructs the flow of cooling air), a higher cooling capacity can be obtained.

[0017] According to the present invention, a lining part can be formed to attach a separate element, such as a foot or an eye bolt, without impairing the cooling performance. Brief description of the drawings Fig. Figure 1 is an enlarged front view of a main part of a geared motor in which a motor and a reduction gear are integrated according to an example of an embodiment of the present invention. Fig. Figure 2 is a complete top view of the geared motor in Fig. 1. Fig. 3 is a complete side view of the geared motor in Fig. 1. Fig. 4A is a perspective view of the geared motor in Fig. 1 and Fig. 4B is a perspective view of the geared motor in Fig. 1, viewed from a different angle. Fig. Figure 5 is a perspective view showing only the main frame body of the geared motor. Fig. 1 shows. Fig. Figure 6 is a side view showing only the main frame body of the geared motor. Fig. 1 shows. Detailed description of the invention

[0018] In the following, an example of an embodiment of the present invention is described in detail with reference to the drawings.

[0019] Fig. Figure 1 is an enlarged front view of a main part of a geared motor, where the motor is integrated with a reduction gear according to an example of an embodiment of the present invention. Fig. 2 is a complete top view and Fig. 3 is a full side view. Additionally, there are Fig. 4A and Fig. 4B Perspective views of the geared motor in Fig. 1. From different angles. Furthermore, Fig. 5 a perspective view showing only the main frame body of the geared motor and Fig. Figure 6 is a side view of this.

[0020] The motor M1 of the geared motor GM1 is surrounded by a frame 12. The frame 12 is mainly configured by the frame main body 14, the load-side cover 16, and the cover 18 opposite the load-side. The frame main body 14, the load-side cover 16, and the cover 18 opposite the load-side are connected to each other by means of a through bolt 26 via a seat 22 on the load-side, located at the load-side cover 16, and a seat 24 opposite the load-side, located at the cover 18 opposite the load-side.

[0021] A support section 28 of the main frame body 14 is formed between the seat 22 on the load side and the seat 24 opposite the load side. The support section 28 is used to attach a separate link (described later) to the main frame body 14.

[0022] The following section provides a detailed description.

[0023] The main frame body 14 of the motor M1 has a completely cylindrical shape and a mounting surface 30A for a terminal box 30. Cooling fins 32 (32A to 32D) are integrally formed around the outer circumference of the main frame body 14. In particular, as shown in Fig. As shown in Figure 6, the cooling fins 32 project in the vertical direction X and the horizontal direction Y (do not project radially from the main frame body 14) when the main frame body 14 is arranged such that the mounting surface 30A of the terminal box 30 (not in Fig. 6 shown) is located in the vertical direction.

[0024] In the present embodiment, the cooling fins 32 are provided and arranged such that a cross-section perpendicular to the axis of the main frame body 14 is viewed from the axial direction (state in Fig. 6) It is considered that their tips are aligned with four sides S1 to S4 of an imaginary quadrilateral (square in this example) S, with side S1 being parallel to the mounting surface 30A of the terminal box 30.

[0025] More precisely, ten cooling fins 32A (especially note the following) are used. Fig. (5 referenced), which have a short length, are arranged by omitting the mounting surface 30A, such that the tips are aligned on side S1, which is parallel to the mounting surface 30A of the terminal box 30. In addition, ten cooling fins 32B and 32D are each arranged such that the tips with the two sides S2 and S4 are aligned perpendicular to the mounting surface 30A, and furthermore, ten cooling fins 32C are arranged such that the tips are aligned with the opposite side S3, which is parallel to the mounting surface 30A. When the cooling fins 32A to 32D are arranged in this way, the spaces P1 to P4 near the corners of the imaginary quadrilateral S can be left empty.

[0026] In the present embodiment, the cover 16 on the load side and the cover 18 opposite the load side each comprise four seats 22 on the load side and four seats 24 opposite the load side at a position corresponding to rooms P1 to P4. Additionally, reference numerals 14A and 14B in the Fig. 5 and Fig. 6 receiving seats (for reinforcement purposes during the installation of the through bolt) are arranged on the main frame body 14 and differ from the seats 22 on the load side and the seats 24 opposite the load side.

[0027] The main frame body 14, the cover 16 on the load side, and the cover 18 opposite the load side are connected to each other by a total of four through bolts 26 via the seats 22 on the load side and the seats 24 opposite the load side. As a result, the support part 28 is also positioned near the corners of the imaginary quadrilateral S.

[0028] Additionally, although the tips of the ribs are aligned on the sides of the imaginary quadrilateral (square) S in the present embodiment, it is also acceptable for the tips of some ribs to be set further back into the interior of the sides of the imaginary quadrilateral. In other words, one of the imaginary quadrilaterals in which the tips of each rib come into contact can be called a maximal imaginary quadrilateral.

[0029] As is obvious in any drawing (especially in Fig. 6) The filler element is not formed between each of the cooling fins 32A to 32D. Additionally, the cooling fins 32A1, 32B1, 32C1, and 32D1 are integrated with the adjacent filler element 28 at both ends of the cooling fins 32A to 32D on the corresponding sides S1 to S4. A configuration of the filler element 28 is described later.

[0030] The load-side cover 16 is also used as a side cover for a reduction gear G1 and is arranged on the lateral part of the load side in the axial direction of the main frame body 14. As described above, the load-side cover 16 comprises a total of four load-side seats 22, which are used when the through bolt 26 is attached, at a position (spaces P1 to P4 near the corners of the imaginary quadrilateral) corresponding to the shim section 28 in the circumferential direction. Each of the load-side seats 22 has a threaded hole 22A into which the through bolt 26 is screwed. The load-side cover 16 is connected to a housing 17 of the reduction gear G1 by a bolt or screw (not shown).

[0031] The cover 18 opposite the load side is arranged on a lateral part of the load-facing side in the axial direction of the main frame body 14. The cover 18 opposite the load side also includes a total of four seats 24 opposite the load side, which are used when the through bolt 26 is fastened at a position (spaces P1 to P4 near the corners of the imaginary quadrilateral) corresponding to the shimming part 28 in the circumferential direction. Each of the seats 24 opposite the load side has a through hole 24A (not a threaded hole or bore) through which the through bolt 26 passes. The cover 18 opposite the load side has an opening (not shown) at its center in the radial direction, and a cooling fan 19 is connected to an output shaft (not shown) of the motor M1 via this opening. Reference numeral 25 denotes a fan cover.

[0032] In this embodiment, four through bolts 26 are used. Each through bolt 26 has a head 26A that comes into contact with the seat 24 opposite the load side of the cover 18. Additionally, each through bolt 26 is inserted into the through hole 24A of the seat 24 opposite the load side and into a through hole 28A (described later) of the support part 28 of the main frame body 14, and its tip is screwed into the threaded hole 22A of the seat 22 on the load side of the cover 16 on the load side. In this way, the main frame body 14, the cover 16 on the load side, and the cover 18 opposite the load side are connected to each other by a through bolt 26 via the seat 22 on the load side and the seat 24 opposite the load side.

[0033] The following describes a configuration around the support element 28. Four of the support elements 28 have essentially the same structure. In this embodiment, a separate component attached to the support element 28 is a foot 60 for mounting the motor M1 to a floor or frame (not shown) of a machine system, and an eye bolt 70 for suspending the motor M1. Each of the support elements 28 can be used for attaching both the foot 60 and the eye bolt 70.

[0034] Referring to the corresponding drawings, two of the feet 60 and two of the eye bolts 70 are shown. Among these, one, shown using a solid line, represents an installed state, and another, shown using a broken line, represents a state awaiting installation.

[0035] Each of the filler parts 28 is configured such that the through-hole 28A is formed to allow the through-bolt 26 to be inserted along the axial direction. Additionally, as shown in Fig. As shown in Figure 6, each of the filler parts 28 comprises a mounting surface 28A parallel to the two sides S1 and S3 of the imaginary quadrilateral S, and a mounting surface 28B parallel to the two sides S2 and S4 of the imaginary quadrilateral S. Furthermore, a chamfer 28C with an angle of 45° is formed at the edge where the mounting surfaces 28A and 28B intersect. Both the opposite distance L2 and the diagonal dimension L4 on the mounting surfaces 28A and 28B are shorter for each of the filler parts 28 than the side length L3 of the corresponding sides S1 to S4 of the imaginary quadrilateral S or the diagonal dimension L5, respectively, and are adjusted to such an extent that the filler parts 28 can be accommodated within the imaginary quadrilateral S.

[0036] Each of the mounting surfaces 28A and 28B has two engagement parts 52, which are designed as round recesses or indentations. That is, four of the engagement parts 52 are formed per filler part 28 and sixteen for the entire frame. A threaded hole 54 is formed at the center of each engagement part 52.

[0037] In a case where the foot 60, which is provided as a separate element, is attached to the filler part 28, two engagement parts 52, formed on an attachment surface 28A (or 28B) of the filler part 28, are used with respect to the foot 60. In the exemplary embodiment, two engagement parts 62, designed as projection parts and corresponding to or fitting with the two engagement parts 52 of the filler part 28, are pre-formed on the foot 60. Additionally, a through-hole 64, which has a coincident center of axis with the threaded hole 54 on the side of the filler part 28, is formed at the center of each projection part 62 (in particular, see below). Fig. 4 (referenced).

[0038] In a case where the eye screw 70 is provided as the separate link and is attached to the filler part 28, an engagement part 52 is used with respect to one eye screw 70 (if a pair of eye screws 70 is attached, another engagement part 52 of the filler part 28 is used). For this reason, the eye screw 70 comprises a large-diameter engagement part 72 that corresponds to or fits with the engagement part 52 of the filler part 28, and a threaded part 74 that is screwed into the threaded hole 54.

[0039] In this embodiment, the reduction gear G1, which is connected to the motor M1, is assumed to be a reduction gear comprising a planetary gear reduction mechanism, which is described as an oscillating, internally meshing design. The reduction gear G1 comprises an input shaft (not shown) which is connected to an output shaft (not shown) of the motor M1 and outputs a slowed rotation from an output shaft 57 which is coaxial with the input shaft.

[0040] The outline L1 of the reduction gear is larger than the outline L2 of the support part 28 of the main frame body 14 of the motor M1 (naturally larger than the diagonal dimension L4). In other words, the support part 28 is accommodated within the plane of projection when the reduction gear G1 is viewed from the axial direction. Furthermore, the outline L1 of the reduction gear G1 is larger than the diagonal dimension L4 of the corner parts of the imaginary quadrilateral SDh. The outline of the reduction gear G1 is larger than the dimensions of the outermost parts of the cooling fan 32. Cooling air from the cooling fin 19, flowing along the cooling fin 32 of the main frame body 14, strikes the cover 16 of the load side connected to the reduction gear G1. Consequently, the housing 17 of the reduction gear G1 can also be cooled.

[0041] Next, the operation of the geared motor GM1 will be described.

[0042] When the engine M1 is started and running, the cooling fins 19, which are connected to the output shaft of the engine M1, rotate to blow cooling air along the cooling fins 32 of the main frame body 14. In the frame structure of the exemplary embodiment, the support elements 28 are formed at four positions, but in each case are arranged between the seat 22 on the load side and the seat 24 opposite the load side. Accordingly, cooling at this part is hardly to be expected, even in the prior art, which originally did not have a support element. In particular, since in the exemplary embodiment the support element 28 is located within the imaginary quadrilateral S, a new problem with regard to cooling between the seat 22 on the load side and the seat 24 opposite the load side hardly arises.

[0043] In contrast, in the prior art (by omitting the position of the through-bolt), the filler element is formed between each of the cooling fins, significantly impeding the flow of the cooling air and consequently reducing the cooling performance. However, since in the exemplary embodiment the filler element is not formed between the cooling fins 32 at all, the flow of the cooling air is not impeded. As a result, highly efficient cooling can be achieved compared to the prior art. Additionally, the cooling air flowing along the cooling fins 32 strikes the cover 16 of the load side, which is connected to the housing 17 of the reduction gear G1. This housing has a larger outline L1 than the maximum outline (i.e., the diagonal dimension L4 of sides S1 to S4 of the imaginary quadrilateral S) of the cooling fins 32. Therefore, the housing 17 of the reduction gear G1 can also be cooled efficiently.

[0044] Additionally, the high cooling efficiency can be considered an advantage in that it is, quite literally, an "improvement in cooling performance." However, if the cooling performance, which is similarly achieved in the prior art, is sufficiently high, the height of the cooling fins, for example, can be reduced, and the advantage can then be directed towards further miniaturization and weight reduction of the entire frame.

[0045] In a case where the foot 60 is attached to the filler part 28, and when the engagement part 62 of the foot 60, designed as a projection, engages with the engagement part 52 of the mounting surface 28A (or 28B) of the filler part 28, the positioning of the foot 60 is automatically carried out with respect to the mounting surface 28A of the filler part 28. Then the axis of the threaded hole 54 of the filler part 28 coincides with the axis of the through hole 64 of the foot 60. Consequently, the attachment of the foot 60 can be completed by screwing a screw (not shown) into the threaded hole 54 via the through hole 64 from the rear of the foot 60.

[0046] In a case where the eye bolt 70 is attached to the filler part 28 and when the threaded part 74 of the eye bolt 70 is screwed into the threaded hole 54 in the center of the engagement part 52 of the mounting surface 28A (or 28B) of the filler part 28, the large diameter engagement part 72 of the eye bolt 70 is ultimately brought into engagement with the engagement part 52 of the mounting surface 28A and consequently the eye bolt 70 can be firmly attached perpendicular to the mounting surface 28A.

[0047] Since the engagement part, such as the engagement part 52, the projection part 62 or the large diameter part 72, is provided in advance by machining, a high-precision arrangement can be implemented.

[0048] The filler parts 28 are formed at four positions in spaces P1 to P4 near the corners of the imaginary quadrilateral S. Additionally, since the filler parts 28 comprise a total of four (two each) engagement parts 52, each formed in the vertical direction and which can correspond to both the foot 60 and the eye bolt 70 with the same structure (due to compatibility), the foot 60 or the eye bolt 70 on the opposite side can be attached very flexibly with respect to the reduction gear G1 or the position of the terminal box 30.

[0049] In the exemplary embodiment, the cooling fin is arranged, as described above, such that the projection directions are perpendicular to each other on any two surfaces. However, in the present invention, the projection direction or similar feature of the cooling fins is not specifically restricted, and the cooling fin can, for example, project in the radial direction.

[0050] In the embodiment described above, the filler element is positioned further inside than the imaginary rectangle with which the tips of the cooling fins in the cross-section perpendicular to the axis of the main frame body come into contact. Although the filler element protrudes slightly, a satisfactory effect can still be achieved.

[0051] Furthermore, the embodiment described above describes an example of the present invention applied to the geared motor where the motor and the reduction gear are integrated. However, the motor according to the present invention need not necessarily be used in a state where it is integrated with the reduction gear and can, for example, be used by assembly with a reduction gear which has a housing independent of the motor frame.

[0052] In addition, the embodiment described above provides four filler parts and a plurality of engagement parts or screw holes for attaching the separate link to each of the filler parts. However, in the present invention, the number of engagement parts and the number of screw holes are not specifically limited. Furthermore, several types of separate links with the same structure can be attached to the filler parts. In the present invention, the filler part itself, the engagement part, or the screw hole for each separate link can be formed separately. The shapes of the engagement part of the filler part and the engagement part of the separate link that engage with each other are not limited to the configuration described above.For example, the relationship between concave and convex can be reversed, and the shape of the part being worked on does not necessarily have to be a circle.

[0053] In addition, according to the present invention, such an engagement element does not necessarily have to be formed on the filling element. For example, only the screw hole can be formed (without the engagement element). The engagement element or the screw hole can be subjected to post-processing at the time of installation. The same applies to the engagement element on the side of the separate link.

Claims

[1] Frame structure (12) of an engine (M1) comprising the following: a cover (16) on the load side and a cover (18) opposite the load side, between which a main frame body (14) is inserted, wherein the cover (16) of the load side and the cover (18) opposite the load side each have seats (22, 24) for fastening a through bolt (26), wherein the main frame body (14), the load-side cover (16) and the cover (18) opposite the load-side are connected to each other by the through bolt (26) via the seats (22, 24), wherein the main frame body (14) has a padding part (28) between the seats (22, 24) to attach separate links (60, 70) to the main frame body (14), wherein the filling part (28) has a through hole (28A) for inserting the through screw (26), and wherein a plurality of threaded holes (54) are formed for fastening the separate links (60, 70) in the liner part (28). [2] Frame structure of an engine according to claim 1, wherein the main frame body (14) has cooling fins (32, 32A-32D) the tips of at least some cooling fins (32, 32A-32D) are configured to come into contact with sides (S1-S4) of an imaginary quadrilateral (S) in a cross-section perpendicular to an axis of the main frame body (14), and wherein the lining part (28) is configured to be arranged within each side (S1-S4) of the imaginary quadrilateral (S). [3] Frame structure of a motor according to claim 1 or 2, wherein the motor (M1) is a motor of a geared motor (GM1) which is used by being connected to a reduction gear (G1), and wherein the support part (28) is accommodated within a projection plane when an outer shape of the reduction gear (G1) is viewed in an axial direction. [4] Frame structure according to one of claims 1 to 3, wherein an engagement part (52) is formed for positioning each of the separate links (60, 70) on the lining part (28). [5] Frame structure of an engine according to claim 4, wherein a plurality of lining parts (28) are formed and each of the lining parts (28) has a similar engagement part (52) for positioning each of the separate links (60, 70), wherein a foot (60) for mounting the motor (M1) on a floor or frame of a machine system is provided as separate components, and an eye bolt (70) for suspending the motor (M1) is provided, and wherein the foot (60) and the eye screw (70) have an engagement part (62, 72) complementary to the engagement part (52) of the lining part (28). [6] Frame structure of an engine according to one of the preceding claims, wherein the support part (28) has a first mounting surface (28A) and a second mounting surface (28B) which are arranged perpendicular to each other, and wherein the plurality of threaded holes (54) is provided on both the first mounting surface (28A) and the second mounting surface (28B).

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