JP6504079B2 - Connection structure between drive shaft member and driven shaft member - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a connection structure between a drive shaft member that connects a driven shaft member and a drive shaft member that generates heat and the driven shaft member.

  In recent years, there are industrial vehicles such as a forklift that drives an oil pump using an engine (internal combustion engine) and a rotating electrical machine as a drive source. For example, in the above industrial vehicle, the crankshaft of the engine is connected to the rotor of the rotating electrical machine, the rotor of the rotating electrical machine is connected to the shaft of the oil pump, and the shaft of the rotating electrical machine is the shaft of the oil pump and the coupling member Connected through. In the above-described industrial vehicle, when the rotating electrical machine operates as a generator, the engine serves as a driving source for the rotating electrical machine and the oil pump, and when the rotating electrical machine operates as a motor, the rotating electrical machine serves as a driving source for the oil pump. Become. The oil pump is driven by an engine or a rotating electrical machine to generate a load handling hydraulic pressure. When the shaft of the oil pump is a driven shaft member, the rotor of the rotary electric machine corresponds to the drive shaft member. As described above, various structures have been proposed for the connection structure in which the drive shaft member and the driven shaft member are connected via the coupling member.

  For example, Patent Document 1 discloses a rotating device in which an output shaft of an engine and a shaft of a dynamo are connected via a coupling. In this rotating device, the output shaft of the engine is connected to the second member of the coupling, the shaft of the dynamo is connected to the first member of the coupling, and the first and second members are It is firmly connected by bolts. Further, on the opposing surface of the first member and the second member, a groove for heat dissipation is radially formed.

JP, 2011-223805, A

  In the invention described in Patent Document 1, since the first member and the second member in the coupling are firmly connected by bolts, torque fluctuation of the engine is directly transmitted to the dynamo, which is not preferable. . Preferably, an elastic body is provided between the first member and the second member in order to absorb engine torque fluctuations. However, when an elastic body is simply sandwiched between the first member and the second member, heat from the dynamo or engine is conducted directly from the first member or the second member to the elastic body. I will. In general, since the elastic body is weak to heat, the durability of the coupling may decrease, and a structure in which the elastic body is simply sandwiched between the first member and the second member is not preferable.

  The present invention has been made in view of such a point, and in a coupling structure between a driven shaft member and a heat generating drive shaft member via a coupling member, it is possible to absorb a torque fluctuation of the drive shaft member. An object of the present invention is to provide a connection structure between a drive shaft member and a driven shaft member which can suppress deterioration in durability of the coupling member due to heat while using a ring member.

  In order to solve the said subject, the connection structure of the drive shaft member which concerns on this invention, and a driven shaft member takes the following means. First, a first aspect of the present invention is a connecting structure of a drive shaft member and a driven shaft member, which connects the driven shaft member and the heat generating drive shaft member, wherein the driven shaft member is a coupling member. And the coupling member is connected to the drive side connection member connected to the drive shaft member, the driven side connection member connected to the driven shaft member, and the drive shaft member And an elastic resin member that absorbs torque fluctuations occurring between the first and second driven shaft members. And the coupling surface which is a surface by the side of the drive shaft member in the coupling member is a fastening surface which becomes the surface by the side of the drive shaft member in the drive side connection member, and the drive in the driven side connection member A non-fastening surface which is a surface on the side of the shaft member has a resin non-fastening surface covered with the elastic resin member, and a drive shaft connection is a surface on the side of the coupling member in the drive shaft member The surface is a connection surface which is a surface of a region overlapping with the fastening surface when viewed from the rotational shaft direction of the drive shaft member, and a surface of a region which overlaps the resin non-fastening surface when viewed from the rotational shaft direction And a non-connecting surface. The connection surface and the fastening surface are directly connected, or connected in a state in which a heat insulating member or a heat dissipating member is interposed, or in a state in which another member provided between the drive shaft member and the coupling member is interposed. Connection, or the heat insulation member or the heat radiation member, and the other member in a sandwiched state, and the non-connection surface and the resin non-fastening surface are not connected, at least the heat insulation member or It is the connection structure of the drive shaft member and the driven shaft member which is in the state where the heat dissipation member is sandwiched.

  In the first aspect of the invention, the elastic resin member can absorb the torque fluctuation of the drive side shaft member. Further, the elastic resin of the drive shaft member to the coupling member can be obtained by sandwiching the heat insulating member or the heat radiating member between the resin non-fastening surface of the coupling surface and the non-connecting surface of the drive shaft connection surface. Suppress the conduction of heat to the components. Thereby, the fall of the endurance of the coupling member by heat can be controlled.

  A second aspect of the present invention is a coupling structure of a drive shaft member and a driven shaft member, which couples the driven shaft member and the heat generating drive shaft member, wherein the driven shaft member is a coupling member. And the coupling member is connected to the drive side connection member connected to the drive shaft member, the driven side connection member connected to the driven shaft member, and the drive shaft And an elastic resin member that absorbs torque fluctuations generated between the member and the driven shaft member. The coupling surface, which is a surface on the side of the drive shaft member in the coupling member, is a resin in which a fastening surface which is a surface on the side of the drive shaft member in the drive side connection member is covered by the elastic resin member. And a non-fastening surface which is a surface on the side of the drive shaft member in the driven side connection member has a non-fastening surface covered with the elastic resin member, and The drive shaft connection surface which is a surface on the side of the coupling member is a connection surface which is a surface of a region overlapping the resin fastening surface when viewed from the rotation shaft direction of the drive shaft member, and viewed from the rotation shaft direction And a non-connecting surface which is a surface of a region overlapping with the resin non-fastening surface. The connection surface and the resin fastening surface are connected in a state of sandwiching at least a heat insulating member or a heat radiating member, and the non-connecting surface and the resin non fastening surface are not connected at least the heat insulating member. Or it is a connection structure of a drive shaft member and a driven shaft member in which the above-mentioned heat dissipation member is made into the state where it was inserted.

  In the second aspect, the elastic resin member can absorb the torque fluctuation of the drive side shaft member. In addition, a heat insulating member or a heat dissipating member is provided between the resin non-fastening surface in the coupling surface and the non-connecting surface in the drive shaft connection surface, and between the resin fastening surface in the coupling surface and the connection surface in the drive shaft connection surface. The sandwiching state suppresses the conduction of heat from the drive shaft member to the elastic resin member of the coupling member. Thereby, the fall of the endurance of the coupling member by heat can be controlled.

  Next, according to a third aspect of the present invention, there is provided a coupling structure between a drive shaft member and a driven shaft member according to the first or second invention, wherein the drive shaft member is formed with an internal space. Of the heat insulating member or the heat radiating member, the shape of the heat insulating member or the heat dissipating member is the shape of the heat insulating member or the heat dissipating member when viewed from the direction of the rotation axis when viewing the drive shaft member from the coupling member side. Connection between a drive shaft member and a driven shaft member, which has a shape covering a drive shaft connection surface and having a through hole penetrating in the direction of the rotation shaft in at least a part of the region covering the internal space It is a structure.

  In the third invention, the heat insulating member or the heat radiating member has a donut disk shape having a shape covering the drive shaft connection surface and having a through hole in at least a part of the region covering the internal space. doing. By setting it as the heat insulation member or heat dissipation member of this shape, the conduction of heat from the drive shaft member to the elastic resin member of the coupling member can be suppressed, and the decrease in durability of the coupling member due to heat can be suppressed.

  Next, according to a fourth aspect of the present invention, there is provided a coupling structure between a drive shaft member and a driven shaft member according to the first or second invention, wherein the drive shaft member has an internal space formed therein. Of the heat insulating member or the heat radiating member, the shape of the heat insulating member or the heat dissipating member is the shape of the heat insulating member or the heat dissipating member when viewed from the direction of the rotation axis when viewing the drive shaft member from the coupling member side. It is a connection structure of a drive shaft member and a driven shaft member, which is shaped to cover the drive shaft connection surface and the internal space.

  In the fourth aspect of the present invention, the heat insulating member or the heat dissipating member in the form of a disk having no through hole is provided in contrast to the third invention in which the heat insulating member or the heat dissipating member is in the shape of a donut disc. Thereby, in addition to the suppression of the conduction of heat from the drive shaft member to the elastic resin member of the coupling member, the conduction of heat from the internal space to the elastic resin member is also suppressed, so the durability of the coupling member due to heat The reduction can be further suppressed.

It is a sectional view explaining a power unit in a 1st embodiment. The structure of the drive shaft connection surface of the drive shaft member in the first embodiment, the appearance etc. of the coupling surface of the coupling member, and the manner in which the heat insulation member is sandwiched and connected by the drive shaft member and the coupling member are described. Is a perspective view. In 1st embodiment, it is a side view explaining the state which connected the coupling member on both sides of the heat insulation member to the drive shaft connection surface of a drive shaft member. In the first embodiment, the appearance of the rotary electric machine and the manner in which the coupling member is attached to the drive shaft connection surface of the drive electric shaft member of the rotary electric machine with the heat insulating member interposed therebetween, and the outer appearance of the coupling member will be described. It is a perspective view. The structure of the drive shaft connection surface of the drive shaft member in the second embodiment, the appearance etc. of the coupling surface of the coupling member, and the manner in which the heat insulation member is sandwiched and connected by the drive shaft member and the coupling member are described. Is a perspective view. The structure of the drive shaft connection surface of the drive shaft member in the third embodiment, the appearance of the coupling surface of the coupling member, etc. and the manner in which the heat dissipation member is sandwiched and coupled by the drive shaft member and the coupling member are described. Is a perspective view. It is a perspective view explaining the example of other structures of a coupling member. It is the perspective view which looked at the coupling member shown in FIG. 7 from the VIII direction.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
● [Structure of power unit (Fig. 1)]
In the present embodiment, a connection structure between a drive shaft member and a driven shaft member used in a power unit of a forklift as an industrial vehicle will be described as an example. As shown in FIG. 1, the power unit 10 is configured by an engine 20, a rotating electrical machine 30, and an oil pump 40. In addition, for convenience, the side of the engine 20 will be described as the rear side, and the side of the oil pump 40 will be described as the front side. In the following description of the embodiment, the rotor 32 of the rotary electric machine 30 corresponds to a drive shaft member that generates heat, and the pump shaft 42 of the oil pump 40 corresponds to a driven shaft member. Further, the rotor 32 and the pump shaft 42 are connected via a coupling member 50. Further, a heat insulating member 60 is interposed between the rotor 32 and the coupling member 50. Although the example shown in FIG. 1 shows an example of a power unit having no plate member, when it has a plate member, it is between the rotor 32 and the heat insulating member 60 as shown by the thick dotted line in FIG. The plate member 70 is inserted into the

  The engine 20 is disposed on the rear side of the rotating electrical machine 30, and one end (front end) of the crankshaft 22 of the engine 20 protrudes from the front side of the engine housing 21. A small-diameter connecting shaft 22 a is formed coaxially with the crankshaft 22 at the projecting end of the crankshaft 22. The connection shaft 22 a is connected to the rear end of the rotor 32 of the rotary electric machine 30. Therefore, the rotational power of the crankshaft 22 is transmitted to the rotor 32. Further, when the rotating electrical machine 30 becomes a drive source, the rotational power of the rotor 32 is transmitted to the crankshaft 22. The engine housing 21 includes a cylinder head, a cylinder head cover, a cylinder block, a crank case, an oil pan and the like.

  The oil pump 40 is disposed on the front side of the rotary electric machine 30, and the pump shaft 42 of the oil pump 40 protrudes from the rear surface side of the pump housing 41. A small diameter connection shaft 42 a is formed coaxially with the pump shaft 42 at the front end (rear end) of the pump shaft 42. The connection shaft portion 42 a is connected to the driven connection member 52 of the coupling member 50. Further, a pump support member 43 for supporting the oil pump 40 with respect to the rotary electric machine 30 is attached to the rear side of the pump housing 41. The pump support member 43 has, for example, a conical cylindrical shape in which the diameter gradually decreases from the side of the rotary electric machine 30 toward the side of the oil pump 40, the front side is fastened to the oil pump 40, and the rear side is It is fastened to the rotating electrical machine 30. Further, the pump support member 43 is formed with a plurality of opening holes 43a for communicating waste heat between the internal space 43k and the outside. The formation position, the shape, the number, the size, and the like of the opening holes 43a are appropriately set.

  The rotary electric machine 30 is disposed on the front side of the engine 20 and on the rear side of the oil pump 40. The rotary electric machine 30 includes a housing body 31 formed of a motor housing 31a, an end plate 35, and a motor cover 36. The housing main body 31 is formed in a substantially cylindrical shape. Further, the end plate 35 is formed in a substantially disc shape, and a through hole for inserting the tip end portion of the crankshaft 22 is formed in the central portion, and the opening end face on the rear side with respect to the housing main body 31 is closed. Is attached to The end plate 35 is fastened to the engine housing 21. Further, the motor cover 36 is formed in a substantially disc shape, and a through hole for attaching the coupling member 50 is formed in the central portion, and the motor cover 36 is attached to the housing main body 31 so as to close the open end face on the front side. There is. The motor cover 36 is fastened to the pump support member 43. Further, at the hole edge portion of the through hole at the central portion of the motor cover 36, a cylindrical tube portion 36a which protrudes to the rear side is formed. The front end (rear end) of the cylindrical portion 36a is in close proximity to the front end surface of the rotor core 33 described later with a predetermined gap.

  Inside the housing body 31, a substantially cylindrical rotor 32 having a flange portion 32a is supported so as to be rotatable around a rotation shaft 32J. Further, a rotor core 33 such as a permanent magnet is attached to the outer wall of the cylindrical surface of the rotor 32. A stator core 34 provided with a coil or the like is attached to the inner wall of the substantially cylindrical housing main body 31 so as to have a predetermined minute gap with the rotor core 33. The rotor 32 has a substantially cylindrical shape having an internal space 32k, and at least the side of the coupling member 50 is open. The front end of the rotor 32 (the end on the oil pump 40 side) is fastened (connected) to the drive-side connecting member 51 of the coupling member 50 via the heat insulating member 60. The external appearance of the coupling member 50 will be described below.

● [Appearance of the coupling member 50 (FIG. 2, FIG. 4)]
The coupling member 50 is comprised by the drive side connection member 51, the driven side connection member 52, and the elastic resin member 53, as shown to FIG. 2, FIG. The coupling member 50 shown in FIGS. 2 and 4 is a perspective view of the coupling member 50 in a state in which the drive side connection member 51, the driven side connection member 52, and the elastic resin member 53 are assembled. In addition, sectional drawing of the coupling member 50 in FIG. 1 has shown II sectional drawing of the coupling member 50 shown in FIG. As shown in FIGS. 2 and 4, an elastic resin member 53 is sandwiched between the drive-side connection member 51 and the driven-side connection member 52 adjacent in the rotational direction. The drive side connection member 51 is connected to the rotor 32 of the rotary electric machine 30 corresponding to the drive shaft member, and the driven side connection member 52 is connected to the pump shaft 42 (see FIG. 1) of the oil pump 40 corresponding to the driven shaft member. Be done. The elastic resin member 53 is disposed between the drive-side connection member 51 and the driven-side connection member 52, and the rotational force from the drive-side connection member 51 is transmitted to the driven-side connection member 52 by its own elastic force. Absorbs torque fluctuations during transmission to the Thus, in the example shown in FIG. 2 and FIG. 4, the coupling member 50 has a cylindrical shape, and the drive side connection members 51 and the driven side connection members 52 are alternately arranged along the rotation direction. An elastic resin member 53 is disposed between the drive side connection member 51 and the driven side connection member 52 in the rotational direction. Further, the coupling member 50 has a coupling surface 50m which is a surface on the side of the rotor 32. The coupling surface 50m has a fastening surface 51m and a resin non-fastening surface 53m, which will be described later.

  The drive side connection member 51 is formed of metal, alloy or the like (for example, aluminum), and has high rigidity and high heat resistance. Further, the drive side connection member 51 has a fastening hole 51a for fastening the rotor 32 and a bolt or the like. The coupling surface 50 m has a fastening surface 51 m which is a surface on the side of the rotor 32 in the drive side connection member 51. . In the example shown in FIG. 1, the fastening surface 51 m of the drive side connection member 51 is fastened (connected) to the rotor 32 (drive shaft member) by the bolt B so as to face the rotor 32 with the heat insulation member 60 interposed therebetween. .

  The driven connection member 52 is formed of metal, alloy or the like (for example, aluminum), and has high rigidity and high heat resistance. Further, an opening hole 52c is formed in the central portion of the driven side connecting member 52, and as shown in FIG. 1, the connecting shaft portion 42a of the pump shaft 42 is spline fitted in the opening hole 52c. Is fastened (connected) to the pump shaft 42 (driven shaft member). The coupling surface 50m has a resin non-fastening surface 53m in which a non-fastening surface, which is a surface on the side of the rotor 32 in the driven side connection member 52, is covered with the elastic resin member 53.

  The elastic resin member 53 is formed of a resin having an elastic force, and absorbs the torque fluctuation when transmitting the rotational power from the drive side connecting member 51 to the driven side connecting member 52 by the elastic force. Further, as described above, the elastic resin member 53 has the resin non-fastening surface 53m. In addition, since the elastic resin member 53 is a resin, its heat resistance is lower than that of a metal, an alloy, or the like.

  Coupling member 50 in a state where drive side connection member 51, elastic resin member 53 and driven side connection member 52 are assembled is a coupling surface having a fastening surface 51m and a resin non-fastening surface 53m, as shown in FIG. 50 m are provided on the side of the rotor 32.

[Connection structure of drive shaft member and driven shaft member in the first embodiment (FIGS. 2 to 4)]
As shown in FIG. 2, a drive shaft connection surface 32 m which is a surface on the side of the coupling member 50 in the rotor 32 has a connection surface 32 c and a non-connection surface 32 d. The connection surface 32 c is a surface of a region overlapping the fastening surface 51 m when viewed in the direction of the rotation shaft 32 J of the rotor 32, and is a surface facing the fastening surface 51 m with the heat insulating member 60 interposed therebetween. The non-connecting surface 32 d (the region indicated by hatching in dotted lines in FIG. 2) is a surface of a region overlapping the resin non-fastening surface 53 m when viewed from the direction of the rotation shaft 32 J of the rotor 32. And the resin non-fastening surface 53m. Fastening holes 32e are formed in the connection surface 32c at positions corresponding to the fastening holes 51a of the fastening surface 51m.

  The shape of the rotor 32 is, as shown in FIGS. 1 and 2, substantially cylindrical with at least the bottom portion on the side of the coupling member 50 open, and has an internal space 32k. The shape of the heat insulating member 60 is, as shown in FIG. 2, FIG. 3 and FIG. 4, the drive shaft connection surface 32m and the internal space when viewed from the direction of the rotation shaft 32J looking at the rotor 32 from the coupling member 50 side. It has a shape (in this case, a disk shape) covering 32k. Further, as shown in FIGS. 2 and 4, in the heat insulating member 60, fastening holes 60a are formed at positions around the edge and corresponding to the fastening holes 32e and the fastening holes 51a. The material of the heat insulating member 60 is, for example, glass epoxy resin.

  As shown in FIGS. 1 and 4, a bolt B is inserted through the fastening hole 51a, the fastening hole 60a and the fastening hole 32e, and between the drive shaft connection surface 32m and the coupling surface 50m (see FIG. 2), The heat insulating member 60 is sandwiched and fastened (connected). Accordingly, the fastening surface 51m (see FIG. 2) and the connection surface 32c are connected in a state in which the heat insulating member 60 is sandwiched. In the case where the plate member 70 indicated by a thick dotted line in FIG. 1 is provided, the fastening surface 51m and the connection surface 32c are provided between the heat insulating member 60 and the plate member 70 (drive shaft member and coupling member (Equivalent to other members) are connected in a sandwiching manner. Further, the resin non-fastening surface 53m (see FIG. 2) and the non-connection surface 32d are not connected, and at least the heat insulating member 60 is sandwiched (in the case of having the plate member 70, the heat insulating member 60 And the plate member 70 are held between them). The heat insulating member 60 prevents the heat of the rotor 32 from being conducted from the drive shaft connection surface 32m to the coupling surface 50m (particularly, the resin non-fastening surface 53m, see FIG. 2).

  In addition, heat may be accumulated in the internal space 32k of the rotor 32. In order to suppress the heat accumulated in the internal space 32k from being conducted to the coupling surface 50m, the heat insulating member 60 is provided with fastening holes 60a formed around the edge (see FIGS. 2 and 4). The through hole is not formed in the central portion (region covering the internal space 32k) except for the above. That is, the heat insulating member 60 blocks the communication between the internal space 32k of the rotor 32 and the coupling surface 50m without communication. Therefore, the heat insulating member 60 suppresses the conduction of heat from the internal space 32k of the rotor 32 to the coupling surface 50m, and further conducts the conduction of heat to the coupling surface 50m (particularly the resin non-fastening surface 53m). Suppress.

  On the other hand, since neither the heat insulating member nor the heat radiating member is sandwiched between the drive shaft connection surface and the coupling surface of the conventional rotor, the heat from the rotor is directly conducted to the resin non-fastening surface .

  In the connection structure between the drive shaft member (in this case, the rotor 32) and the driven shaft member (in this case, the pump shaft 42) in the first embodiment, between the drive shaft connection surface 32m and the coupling surface 50m (ie, Since the heat insulating member 60 in which the through hole is not formed at the central portion is interposed between the non-connecting surface 32d and the resin non-fastening surface 53m), as described above, the drive shaft connection of the rotor 32 is While suppressing the heat conducted from the surface 32m to the coupling surface 50m, the heat conducted from the inner space 32k of the rotor 32 to the coupling surface 50m can also be restrained. Therefore, it is possible to suppress a decrease in the durability of the coupling member 50 (such as deterioration of the elastic resin member due to heat). Further, when a glass epoxy resin is used as the heat insulating member 60, the thickness of the heat insulating member 60 can be suppressed to about several millimeters, so that the axial length of the power unit 10 can be prevented from being longer than necessary. it can. The heat insulating member 60 may be replaced by a heat dissipating member.

[Connection structure of drive shaft member and driven shaft member in the second embodiment (FIG. 5)]
Next, a second embodiment of the connection structure between the drive shaft member and the driven shaft member will be described with reference to FIG. In the second embodiment, the shape of the heat insulating member 61 is the same as the shape of the heat insulating member 60 of the first embodiment shown in FIGS. In that the through hole 61c is formed in the part). Hereinafter, this difference will be mainly described.

  The shape of the rotor 32 shown in FIG. 5 is the same as the shape of the rotor 32 shown in FIG. 2 and is substantially cylindrical with at least the bottom portion on the coupling member 50 side open, and has an internal space 32k. . As shown in FIG. 5, in the heat insulating member 61, a through hole 61c is formed in the central portion. That is, the shape of the heat insulating member 61 is a shape that covers the drive shaft connection surface 32m and at least a region covering the internal space 32k when viewed from the direction of the rotation shaft 32J looking at the rotor 32 from the coupling member 50 side. A part has a through hole 61c penetrating in the direction of the rotation shaft 32J. Further, similar to the heat insulating member 60 of the first embodiment, a fastening hole 61 a is formed around the edge of the heat insulating member 61. In the example shown in FIG. 5, the shape of the heat insulating member 61 is a donut disk shape in which the through hole 61c is formed at the center.

  And as shown in FIG. 5, the fastening surface 51m and the connection surface 32c are connected in the state which pinched | interposed the heat insulation member 60. As shown in FIG. In the case where the plate member 70 indicated by a thick dotted line in FIG. 1 is provided, the fastening surface 51m and the connection surface 32c are provided between the heat insulating member 60 and the plate member 70 (drive shaft member and coupling member (Equivalent to other members) are connected in a sandwiching manner. Further, at least the heat insulating member 60 is held between the resin non-fastening surface 53 m and the non-connecting surface 32 d without being connected (in the case of having the plate member 70, the heat insulating member 60 and the plate member 70 Is in a state of being pinched).

  And while the heat insulation member 61 suppresses the heat conducted from the drive shaft connection surface 32m of the rotor 32 to the coupling surface 50m, the material of the heat insulation member can be saved with respect to the first embodiment. .

  The shape of the heat insulating member may be the shape of the heat insulating member 62 having a plurality of fan-shaped shapes shown in () of FIG. 5. The heat insulating member 62 is shaped to cover the resin non-fastening surface 53m of the coupling surface 50m when viewed from the direction of the rotary shaft 32J looking at the coupling member 50 from the side of the rotor 32, and also the fastening of the coupling surface 50m It does not cover the surface 51m. When viewed from the opposite direction, the heat insulating member 62 is shaped to cover the non-connecting surface 32 d of the drive shaft connecting surface 32 m of the rotor 32 and is shaped not to cover the connecting surface 32 c of the drive shaft connecting surface 32 m. In this case, the fastening surface 51m and the connection surface 32c are directly connected. In the case where the plate member 70 indicated by the thick dotted line in FIG. 1 is provided, the fastening surface 51m and the connection surface 32c correspond to the plate member 70 (other members provided between the drive shaft member and the coupling member). It is connected in the state which sandwiches). Further, at least the heat insulating member 61 is held between the resin non-fastening surface 53m and the non-connection surface 32d without being connected (in the case where the plate member 70 is provided, the heat insulating member 61 and the plate member 70 Is in a state of being pinched).

  The heat insulating member 62 suppresses the heat conducted from the non-connecting surface 32d of the drive shaft connecting surface 32m of the rotor 32 to the resin non-fastening surface 53m of the coupling surface 50m, and heat-insulates the heat insulating member 61 described above. The material of the component can be further saved. Note that the heat insulating members 61 and 62 may be replaced with heat dissipating members.

[Connection structure of drive shaft member and driven shaft member in the third embodiment (FIG. 6)]
Next, a third embodiment of the connecting structure between the drive shaft member and the driven shaft member will be described with reference to FIG. The third embodiment is different from the heat insulating member 60 of the first embodiment shown in FIG. 2 in that the heat radiation member 63 is sandwiched between the drive shaft connection surface 32m and the coupling surface 50m. Hereinafter, this difference will be mainly described.

  As shown in FIG. 6, the heat dissipation member 63 is formed of a material (for example, aluminum) having a relatively high thermal conductivity, and has a substantially cylindrical shape, and fins 63f continuous in the circumferential direction on the side surface A plurality of are formed. Further, in the heat dissipation member 63, fastening holes 63a are formed at positions around the edge and corresponding to the fastening holes 32e and the fastening holes 51a. The heat radiation member 63 is fastened in a state of being sandwiched between the drive shaft connection surface 32m and the coupling surface 50m by inserting and fastening the bolt B into the fastening hole 51a, the fastening hole 63a and the fastening hole 32e. Connected). The heat dissipation member 63 suppresses the heat of the rotor 32 from being conducted from the drive shaft connection surface 32m and the internal space 32k to the coupling surface 50m (particularly, the resin non-fastening surface 53m). A through hole may be provided in the central portion of the heat radiating member 63 as in the heat insulating member 61 described in the second embodiment. Further, as in the heat insulating member 62 described in the second embodiment, the heat dissipating member may be divided into a plurality of heat dissipating members covering the non-connection surface 32 d.

● [Other structure of the coupling member (Figures 7 and 8)]
As described above, in the connection structure between the drive shaft member and the driven shaft member described in the first to third embodiments, the heat conducted from the rotor 32 to the coupling member 50 can be sufficiently suppressed. Therefore, a structure in which the heat insulating member or the heat dissipating member is interposed between the connection surface 32c and the fastening surface 51m in the first to third embodiments described in FIGS. 2 to 6 (that is, the division shown in FIG. 5) In the structure except the structure of the heat insulating member 62 in the state, the structure of the coupling member may be, for example, a structure shown in FIG. 7 and FIG. In the coupling member 50A shown in FIGS. 7 and 8, the elastic resin member 53 of the coupling member 50 shown in FIGS. 2 to 6 is changed to the elastic resin member 54 so that the fastening surface 51m is covered with the elastic resin member 54. (The drive side connecting member 51 and the driven side connecting member 52 are the same). Hereinafter, this difference will be mainly described.

  As shown in FIGS. 7 and 8, only the elastic resin member 54 is exposed on the coupling surface 50Am of the coupling member 50A without the drive side connecting member 51 being exposed. That is, the coupling member 50A shown in FIG. 7 and FIG. 8 covers the fastening surface 51m of the coupling member 50 shown in FIGS. 2 to 6 with the elastic resin member 54. That is, the coupling surface 50Am is a resin fastening surface 54ma whose fastening surface which is a surface on the side of the rotor 32 (drive shaft member) in the drive side connection member 51 is covered with the elastic resin member 54; A non-fastening surface which is a surface on the side of the rotor 32 has a resin non-fastening surface 54mb (an area indicated by hatching in dotted lines in FIG. 7) covered with the elastic resin member 54. Further, a fastening hole 54 n is formed in the elastic resin member 54 at a position corresponding to the fastening hole 32 e of the rotor 32 and at a position corresponding to the fastening hole 51 a of the drive side connecting member 51. The structure of the elastic resin member 54 is a simple structure with respect to the structure of the elastic resin member 53 shown in FIGS. 2 and 3, so that the manufacturing of the coupling member can be made easier.

  The drive shaft connection surface 32m of the rotor 32, as shown in FIG. 2, is a connection surface 32c which is a surface of a region overlapping the resin fastening surface 54ma (see FIG. 7) when viewed from the direction of the rotation shaft 32J of the rotor 32. And a non-connecting surface 32d which is an area overlapping with the resin non-fastening surface 54mb (see FIG. 7) when viewed in the direction of the rotation shaft 32J.

  The connection surface 32c and the resin fastening surface 54ma are connected (with or without the plate member 70) sandwiching at least the heat insulating member or the heat radiating member. Further, the non-connecting surface 32d and the resin non-fastening surface 54mb are not connected to each other (with or without the plate member 70) and at least a heat insulating member or a heat dissipating member is sandwiched.

  According to the connection structure between the drive shaft member (in this case, the rotor 32) and the driven shaft member (in this case, the pump shaft 42) described above, the elastic resin members 53, 54 of the coupling members 50, 50A drive While being able to absorb the torque fluctuation of the side shaft member, it is suppressed that the heat from the drive shaft member is conducted to the elastic resin members 53, 54 of the coupling members 50, 50A, and the durability of the coupling members 50, 50A It is possible to suppress a decrease (such as deterioration of the elastic resin member due to heat).

  The connection structure of the drive shaft member and the driven shaft member of the present invention is not limited to the configuration, structure, shape, etc. described in the present embodiment, and various changes, additions, and deletions can be made within the scope of the present invention. Is possible. For example, the structures of the coupling members 50 and 50A, the shape of the drive side connecting member 51, the shape of the driven side connecting member 52, the shapes of the elastic resin members 53 and 54, etc. are the same as those described in the present embodiment. It is not limited.

  Although an example in which the plate member 70 is provided is described as an example in the case of providing another member between the rotor 32 and the coupling members 50 and 50A, the other members are not limited to the plate member, and various members Can be another member.

  Further, in the description of the present embodiment, an example in which the rotor of the rotating electric machine used for the power unit of a forklift as an industrial vehicle is a drive shaft member and the pump shaft of the oil pump of the power unit is a driven shaft member has been described. The drive shaft member is not limited to the rotor, and the driven shaft member is not limited to the pump shaft. Therefore, it is possible to apply to the connection structure of the drive shaft member and driven shaft member which are used for various apparatuses and various applications.

DESCRIPTION OF SYMBOLS 10 Power unit 20 Engine 21 Engine housing 22 Crankshaft 30 Electric rotating machine 31 Housing main body 31a Motor housing 32 Rotor (drive shaft member)
32c connecting surface 32d non-connecting surface 32e fastening hole 32J rotating shaft 32k internal space 32m drive shaft connecting surface 33 rotor core 34 stator core 36 motor cover 36a tube 40 oil pump 42 pump shaft (following shaft member)
43 pump support member 50, 50A coupling member 50m, 50Am coupling surface 51 drive side connecting member 51a fastening hole 51m fastening surface 52 driven side connecting member 53 elastic resin member 53m resin non fastening surface 54 elastic resin member 54ma resin fastening surface 54mb Resin non-fastening surface 54n Fastening holes 60, 61, 62 Heat insulation members 60a, 61a, 62a, 63a Fastening holes 63 Heat dissipation member 63f Fin 70 Plate member (other members)

Claims (4)

A connecting structure of a drive shaft member and a driven shaft member, which connects the driven shaft member and the heat generating drive shaft member,
The driven shaft member is coupled to the drive shaft member via a coupling member,
The coupling member includes a drive-side connection member connected to the drive shaft member, a driven-side connection member connected to the driven shaft member, and a torque fluctuation generated between the drive shaft member and the driven shaft member. And an elastic resin member that absorbs
A coupling surface which is a surface on the side of the drive shaft member in the coupling member is a fastening surface which is a surface on the side of the drive shaft member in the drive side connection member and the drive shaft member in the driven side connection member A non-fastening surface which is a surface on the side of the resin, and a non-fastening surface of the resin covered with the elastic resin member;
A drive shaft connection surface which is a surface on the side of the coupling member in the drive shaft member is a connection surface which is a surface of a region overlapping with the fastening surface when viewed from the rotation shaft direction of the drive shaft member; And a non-connecting surface which is a surface of a region overlapping with the resin non-fastening surface when viewed from the axial direction;
The connection surface and the fastening surface are directly connected, or connected in a state in which a heat insulating member or a heat dissipating member is sandwiched, or connected in a state in which another member provided between the drive shaft member and the coupling member is interposed. Or connected in a state in which the heat insulating member or the heat radiating member and the other member are sandwiched,
The non-connecting surface and the resin non-fastening surface are not connected to each other, and at least the heat insulating member or the heat dissipating member is sandwiched.
Connection structure between the drive shaft member and the driven shaft member. A connecting structure of a drive shaft member and a driven shaft member, which connects the driven shaft member and the heat generating drive shaft member,
The driven shaft member is coupled to the drive shaft member via a coupling member,
The coupling member includes a drive-side connection member connected to the drive shaft member, a driven-side connection member connected to the driven shaft member, and a torque fluctuation generated between the drive shaft member and the driven shaft member. And an elastic resin member that absorbs
A coupling surface which is a surface on the side of the drive shaft member in the coupling member is a resin fastening surface in which a fastening surface which is a surface on the side of the drive shaft member in the drive side connection member is covered by the elastic resin member. And a non-fastening surface which is a surface on the side of the drive shaft member in the driven side connecting member has a non-fastening surface of resin covered with the elastic resin member,
A drive shaft connection surface which is a surface on the side of the coupling member in the drive shaft member is a connection surface which is a surface of a region overlapping the resin fastening surface when viewed from the rotational shaft direction of the drive shaft member; And a non-connecting surface which is a surface of a region overlapping the resin non-fastening surface when viewed from the rotation axis direction,
The connection surface and the resin fastening surface are connected in a state in which at least a heat insulating member or a heat dissipating member is sandwiched,
The non-connecting surface and the resin non-fastening surface are not connected to each other, and at least the heat insulating member or the heat dissipating member is sandwiched.
Connection structure between the drive shaft member and the driven shaft member. It is a connection structure of the drive shaft member according to claim 1 or 2 and a driven shaft member, wherein
The drive shaft member has a cylindrical shape in which an internal space is formed and at least the side of the coupling member is opened,
The shape of the heat insulating member or the heat radiating member is a region that covers the drive shaft connection surface and covers the internal space when viewed from the direction of the rotation shaft when the drive shaft member is viewed from the coupling member side. At least a portion of the through-hole penetrating in the rotational axis direction,
Connection structure between the drive shaft member and the driven shaft member. It is a connection structure of the drive shaft member according to claim 1 or 2 and a driven shaft member, wherein
The drive shaft member has a cylindrical shape in which an internal space is formed and at least the side of the coupling member is opened,
The shape of the heat insulating member or the heat radiating member is a shape that covers the drive shaft connection surface and the internal space when viewed from the direction of the rotation shaft when the drive shaft member is viewed from the coupling member side. ,
Connection structure between the drive shaft member and the driven shaft member.

Images