JP2010242411A - Bearing fixing device for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing fixing device for a construction machine capable of stopping the rotation of a nut member without needing to tighten the nut member after reaching regular drag torque to stop fastening of the nut member. <P>SOLUTION: The bearing fixing device provided at a swing device 6 of a hydraulic shovel 1 includes the nut member 21 having two threaded holes 21C and pressing bearings 19, 20 to a housing 15; a lock plate 31 having nine through-holes 31B and a spline part 31A engaged with a spline part 10C formed at a swing output shaft 10, and fixed to the nut member 21; and two bolts 27 inserted in the through-holes 31B and screwed into the threaded holes 21C to fix the lock plate 31 to the nut member 21. The lock plate 31 includes the nine through-holes 31B in a circumferential direction centering on the axis of the swing output shaft 10, at the pitch β(θ) preset in relation to the pitch P(θ) of the spline part 10C. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bearing fixing device for a construction machine that is included in a turning device or the like provided in a construction machine such as a hydraulic excavator or a crane, and that fixes a bearing that supports a rotating shaft to a housing in which the bearing is accommodated.

  FIG. 9 is a side view showing a hydraulic excavator exemplified as an example of a construction machine including a turning device including a bearing fixing device.

  A hydraulic excavator 1 shown in FIG. 9 includes a traveling body 2, a revolving body 4 disposed on the traveling body 2 via a revolving wheel 3, and a front provided on the revolving body 4 so as to be rotatable in the vertical direction. A work machine 5 is provided. The front work machine 5 includes a boom 5a attached to the revolving structure 4, an arm 5b attached to the tip of the boom 5a, and a bucket 5c attached to the tip of the arm 5b. Further, a turning device (not shown) that is interposed between the traveling body 2 and the turning body 4 and turns the turning body 4 is provided. For example, this swivel device includes the bearing fixing device targeted by the present invention.

  10 is a front view showing a part of a turning device including a conventional bearing fixing device, FIG. 11 is an enlarged front view showing a portion B of FIG. 10, and FIG. 12 is a CC line of FIG. It is the cross-sectional view expanded and shown along.

  As shown in FIG. 10, the turning device 6 decelerates the rotation of the turning motor 7 and the motor output shaft 8 of the turning motor 7, increases the torque, and transmits it to the rotating shaft, that is, the turning output shaft 10. And a housing 15 in which the turning output shaft 10 is accommodated. The turning motor 7 and the upper surface of the ring gear 11 of the planetary reduction mechanism 9 are fixed by bolts. The flange portion 15 </ b> A of the housing 15 is fixed to the revolving body 4 with bolts.

  The planetary reduction mechanism 9 is configured in two stages, and the rotational force of the turning motor 7 is transmitted to the first stage sun gear 12 by the motor output shaft 8, and the planetary gear 13 rotates between the ring gear 11 and the sun gear 12. While making a revolution. The revolution of the planetary gear 13 is transmitted to the second-stage sun gear 16 through the carrier 14 that supports the planetary gear 13, and the planetary gear 17 revolves while rotating between the ring gear 11 and the sun gear 16. The revolution of the planetary gear 17 is transmitted to the turning output shaft 10 through the carrier 18 that supports the planetary gear 17.

  A gear portion 10A provided at the lower end of the turning output shaft 10 meshes with the inner ring 3A of the turning wheel 3 fixed to the traveling body 2, and the rotational force of the turning output shaft 10 is applied to the inner ring 3A of the turning wheel 3. Reportedly. The outer ring of the turning wheel 3 is fixed to the turning body 4. A grease chamber 25 is provided at a meshing portion between the gear portion 10 </ b> A of the turning output shaft 10 and the inner ring 3 </ b> A of the turning wheel 3 in which grease for lubricating the meshing portion is accommodated. The grease chamber 25 is provided in the traveling body 2.

  The turning output shaft 10 is rotatably supported by a bearing 19 and a bearing 20. The bearing 19 and the bearing 20 are fixed to the housing 15. These bearings 19 and 20 are tapered roller bearings.

  A nut member 21 for pressing the bearing 19 against the housing 15 is provided on the bearing 19 disposed on the upper side. Further, on the nut member 21, as shown in FIGS. 11 and 12, a lock plate 26 that is a detent member of the nut member 21 with respect to the turning output shaft 10 is provided. Further, a bolt 27 for fixing the lock plate 26 to the nut member 21 is provided. A conventional bearing fixing device that fixes the bearings 19 and 20 to the housing 15 while applying a pressing force, that is, preload, to the bearings 19 and 20 by the nut member 21, the lock plate 26, and the bolts 27. It is configured.

  As shown in FIG. 1, a screw portion 10B is formed on the outer periphery of the upper portion of the turning output shaft 10, and a screw portion 21A that is screwed to the screw portion 10B is formed on the inner periphery of the nut member 21. ing. Therefore, the bearings 19 and 20 are preloaded by screwing the nut member 21 into the turning output shaft 10. The nut member 21 is provided with a screw hole 21C, and the lock plate 26 is provided with a spline portion 26A and a through hole 26B. The lock plate 26 is fixed to the nut member 21 by the bolt 27 in a state where the spline portion 10 </ b> C formed on the turning output shaft 10 and the spline portion 26 </ b> A of the lock plate 26 are engaged with each other. Thereby, the nut member 21 is fixed in a state in which the rotation with respect to the turning output shaft 10 is prevented.

  The lubrication in the turning device 6 is gear oil lubrication, and the gear oil is sealed by the oil seal 22 at the lower part of the turning device 6 and the sliding member 24 fitted to the turning output shaft 10. The oil seal 22 is held and fixed to the housing 15 and performs a sealing function by being in sliding contact with the outer periphery of the sliding member 24. A known technique of this type is disclosed in Patent Document 1.

JP-A-11-351267

  However, conventionally, the preload management of the bearings 19 and 20 by the nut member 21 is performed by screwing the nut member 21 with respect to the turning output shaft 10 while rotating the housing 15 relative to the turning output shaft 10 to preload the bearing. It is managed by the drag torque when it is given. When the specified drag torque is reached, tightening of the nut member 21 is stopped. Thus, at the position where the nut member 21 is stopped, the screw of the nut member 21 is caused by the meshing relationship between the spline portion 10C of the turning output shaft 10 and the spline portion 26A of the lock plate 26 and various manufacturing errors. The hole 21C and the through hole 26B of the lock plate 26 are hardly matched correctly. Therefore, before the bolt 27 is inserted, the nut member 21 is tightened to correctly align the screw hole 21 and the through hole 26B. At this time, the rotational angle of the retightening is a maximum of one pitch of the spline. The influence on the life of the bearings 19 and 20 due to such preload at the time of retightening cannot be ignored.

  For this reason, conventionally, the bearings 19 and 20 have a load capacity with a margin for the maximum preload predicted when retightening, that is, a relatively large shape having a load resistance, and strength. A strong bearing must be provided. For this reason, the housing 15 constituting the bearing fixing device is increased in size, and the manufacturing cost of the bearing fixing device is high.

  The present invention has been made in view of such a situation of the prior art, and the object thereof is to achieve the specified drag torque and stop the tightening of the nut member, and then does not require additional tightening of the nut member. An object of the present invention is to provide a bearing fixing device for a construction machine that can prevent rotation of a nut member.

  In order to achieve the above object, a bearing fixing device for a construction machine according to the present invention is a bearing fixing device for a construction machine that fixes a bearing supporting a rotating shaft to a housing, and has a screw hole. A lock member fixed to the nut member having a nut member to be pressed against the housing, a spline portion engaged with a spline portion formed on the rotating shaft, and a through hole, and the through hole of the lock plate A bearing fixing device for a construction machine, comprising: a bolt inserted into and screwed into a screw hole of the nut member, and fixing the lock plate to the nut member; wherein the lock plate is the spline formed on the rotary shaft A plurality of through-holes having a pitch that is set in advance in relation to the pitch of the part and larger than the number of the bolts in a circumferential direction around the axis of the rotation shaft. It is characterized in that was.

  In the present invention configured as described above, the nut member is screwed into the rotating shaft while the housing is rotated relative to the rotating shaft to preload the bearing, and the drag torque reaches the specified drag torque and the nut is reached. Even when the tightening of the member is stopped, the screw plate of the nut member is correctly aligned with any of the plurality of through holes of the lock plate by rotating the lock plate in the circumferential direction around the axis of the rotation shaft. be able to. Therefore, before inserting the bolt into the through hole, it is possible to prevent the nut member from rotating without requiring additional tightening of the nut member to correctly align the screw hole and the through hole.

  In the bearing fixing device for a construction machine according to the present invention, θ is a phase based on the axis of the rotating shaft, P (θ) is a pitch of the spline portion formed on the rotating shaft, and the pitch P (θ ) Is the pitch set in advance in relation to β (θ), the difference between the tooth thickness of the spline portion formed on the rotating shaft and the tooth thickness of the spline portion of the lock plate is α (θ), When the difference between the diameter of the through hole and the diameter of the bolt is γ (θ), the relationship is P (θ) −β (θ) <α (θ) + γ (θ).

  In the present invention configured as described above, the gap caused by the difference between the tooth thickness of the spline portion formed on the rotating shaft and the tooth thickness of the spline portion of the lock plate and the gap caused by the difference between the diameter of the through hole and the diameter of the bolt are reduced. Since it can be used, even if a manufacturing error or the like occurs in a plurality of through holes provided in the lock plate, the screw hole of the nut member can be surely aligned with any of the plurality of through holes in the lock plate. .

  In addition, the bearing fixing device for a construction machine according to the present invention is configured so that the lock plate is formed on the rotary shaft when the front surface of the lock plate is used or when the back surface is used. A plurality of the through holes having a pitch set in advance in relation to the pitch of the bolts and having a number larger than the number of the bolts are provided in a circumferential direction centering on the axis of the rotating shaft.

  Since the present invention configured as described above can use both surfaces of the lock plate, the number of through holes can be reduced, and the lock plate can be downsized. Therefore, the lock plate can be easily installed on the nut member and the rotating shaft, and the manufacturing cost of the lock plate can be reduced.

  Further, in the bearing fixing device for a construction machine according to the present invention, the nut member has an annular convex portion that comes into contact with a carrier included in the planetary reduction mechanism, and the convex portion has a notch that does not interfere with the lock plate. It is characterized by providing a section. With this configuration, even if the lock plate is rotated in the circumferential direction around the axis of the rotation shaft in order to align the screw hole of the nut member with the through-hole of the lock plate, the lock plate remains protruding from the nut member. Therefore, the rotation range of the lock plate can be fully utilized.

  In the bearing fixing device for a construction machine according to the present invention, the construction machine includes a traveling body, a revolving body disposed on the traveling body, and a swiveling device provided between the traveling body and the revolving body. And a part of the swivel device. If comprised in this way, it can utilize effectively in the hydraulic excavator used frequently for earth excavation work etc.

  In the bearing fixing device for a construction machine according to the present invention, the lock plate that is fixed to the nut member that presses the bearing against the housing has a pitch set in advance in relation to the pitch of the spline portion formed on the rotating shaft, and the number of bolts. Since there are more through-holes in the circumferential direction around the axis of the rotating shaft, the lock plate can be mounted even when the drag torque reaches the specified drag torque and tightening of the nut member stops. By rotating in the circumferential direction around the axis of the rotation shaft, the screw hole of the nut member can be correctly aligned with any of the plurality of through holes of the lock plate. For this reason, before the bolt is inserted into the through hole, the nut member can be prevented from rotating without the need to retighten the nut member to correctly match the screw hole and the through hole. Accordingly, it is not necessary to provide a strong bearing for tightening the nut member, so that the housing can be reduced in size and the manufacturing cost of the bearing fixing device can be reduced.

It is a cross-sectional view which shows the attachment state of 1st Embodiment of the bearing fixing device of the construction machine which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of 1st Embodiment of the bearing fixing device of the construction machine which concerns on this invention, (a) A figure is a cross-sectional view of a turning output shaft part, (b) A figure engages with the spline part of a turning output shaft It is a top view which shows the lock plate to perform. It is the top view which expanded and showed the A section of FIG. It is sectional drawing which shows the state which penetrated the volt | bolt to the through-hole of the lock plate shown in FIG. It is a figure explaining the use condition of 1st Embodiment of the bearing fixing device of the construction machine which concerns on this invention. It is a cross-sectional view which shows the attachment state of 2nd Embodiment of the bearing fixing device of the construction machine which concerns on this invention. It is a figure which shows the structure of 2nd Embodiment of the bearing fixing device of the construction machine which concerns on this invention. It is a figure explaining the use condition of 2nd Embodiment of the bearing fixing device of the construction machine which concerns on this invention. It is a side view which shows the hydraulic excavator mentioned as an example of the construction machine provided with the turning apparatus containing a bearing fixing device. It is the front view which carried out the cross section of a part which shows the turning device in which the conventional bearing fixing device is included. It is the front view which expanded and showed the B section of FIG. It is the cross-sectional view expanded and shown along the CC line of FIG.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the bearing fixing device of the construction machine which concerns on this invention is demonstrated based on figures.

[First Embodiment]
The bearing fixing device for a construction machine according to the present invention is provided, for example, in the turning device 6 shown in FIGS. 10 to 12 described above, and the turning device 6 shown in FIGS. 10 to 12 is shown in FIG. The excavator 1 shown is provided. That is, the basic configuration of the turning device 6 provided with the bearing fixing device for a construction machine according to the present invention is the same as the configuration excluding the lock plate 26 portion shown in FIGS. Accordingly, the same reference numerals are given to the portions overlapping with the hydraulic excavator 1 and the turning device 6 shown in FIGS.

  FIG. 1 is a transverse sectional view showing a mounting state of a first embodiment of a bearing fixing device for a construction machine according to the present invention, and FIG. 2 is a diagram showing a configuration of the first embodiment of the bearing fixing device for a construction machine according to the present invention. (A) is a cross-sectional view of the turning output shaft portion, (b) is a plan view showing a lock plate that engages with the spline portion of the turning output shaft, and FIG. 3 is an enlarged view of portion A in FIG. FIG. 4 is a cross-sectional view showing a state in which a bolt is inserted into the through hole of the lock plate shown in FIG. 2, and FIG. 5 is a view showing a use state of the first embodiment of the bearing fixing device for a construction machine according to the present invention. It is a figure explaining.

  Although partially overlapping with the above description, as shown in FIGS. 1 and 2, the first embodiment of the bearing fixing device for a construction machine according to the present invention has a plurality of screw holes 21C, for example, two screw holes 21C. A nut member 21 that presses the bearings 19 and 20 against the housing 15, a spline portion 31A that engages with a spline portion 10C formed on the turning output shaft 10 as a rotation shaft, and a plurality of through holes 31B, for example, nine A lock plate 31 having a through hole 31B and fixed to the nut member 21, and inserted into one of the through holes 31B of the lock plate 31 and screwed into the two screw holes 21C of the nut member 21, And two bolts 27 for fixing 31 to the nut member 21. That is, the number of through holes 31 </ b> B provided in the lock plate 31 is set to be larger than the number of bolts 27. The nut member 21 is provided with a convex portion 21B that contacts the lower end of the carrier 18, and the convex portion 21B is provided with a notch 28 that does not interfere with the rotation of the lock plate 31.

  Further, as shown in FIG. 2, the lock plate 31 has nine through holes 31 </ b> B of the turning output shaft 10 at a pitch β set in advance in relation to the pitch P of the spline portion 10 </ b> C formed on the turning output shaft 10. It arrange | positions in the circumferential direction centering on an axial center. For example, θ is a phase based on the axis of the turning output shaft 10, and the pitch P of the spline portion 10C formed on the turning output shaft 10 is expressed as P (θ) as a function of the phase θ, and this pitch P (θ) The pitch β set in advance in relation to is also expressed as β (θ) as a function of the phase θ. 3 and 4, the difference between the tooth thickness of the spline portion 10C formed on the turning output shaft 10 and the tooth thickness of the spline portion 31A of the lock plate 31 is α, the diameter of the through hole 31B and the bolt 27 The difference from the diameter of γ is γ, and similarly α and γ are expressed as α (θ) and γ (θ) as a function of the phase θ, respectively. These four P (θ), β (θ), α (θ), and γ (θ) satisfy the following relational expressions (1) to (4).

H = V + C (1)
W = C + 1 (2)
β (θ) = {(W−1) / W} P (θ) (3)
P (θ) −β (θ) <α (θ) + γ (θ) (4)
Here, C: number of through-holes 31B into which bolts 27 are not inserted H: total number of through-holes 31B V: number of bolts 27 W: possible arrangement state of lock plate 31 with respect to screw hole 21C of nut member 21 In the first embodiment of the bearing fixing device for a construction machine according to the present invention, from H = 9 and V = 2, from Equation (1) to C = 7 and from Equation (2) to W = 8. Further, the expression (3) is β (θ) = (7/8) P (θ), and the expression (4) is (1/8) P (θ) <α (θ) + γ (θ).

  When the first embodiment of the bearing fixing device for a construction machine according to the present invention is used, the nut member 21 is screwed into the turning output shaft 10 while the housing 15 is rotated relative to the turning output shaft 10. After preload is applied to 19 and 20 and the drag torque reaches a specified drag torque and the tightening of the nut member 21 is stopped, the lock plate 10C is formed on the spline portion 10C formed on the turning output shaft 10 as shown in FIG. 31 spline portions 31A are engaged with each other so that any two of the through holes 31B provided in the lock plate 31 and the two screw holes 21C of the nut member 21 are aligned. That is, eight arrangement states (W = 8) in which the lock plate 31 is displaced with respect to the two screw holes 21C of the nut member 21 by a pitch 1 / 8P (θ) of (a) to (h) shown in FIG. Are installed in any one state, and any two of the through holes 31B and the two screw holes 21C of the nut member 21 are made to coincide with each other.

  Then, with the through holes 31B and the screw holes 21C aligned, the two bolts 27 are inserted into the through holes 31B and fastened to the screw holes 21C, and the lock plate 31 is fixed to the nut member 21. At this time, when the two bolts 27 cannot be fastened to the screw hole 21C successfully, the tooth thickness of the spline portion 10C formed on the turning output shaft 10 and the lock in each of the eight states (a) to (h) shown in FIG. Fine adjustment is performed using a gap resulting from the difference α (θ) from the tooth thickness of the spline portion 31A of the plate 31 and a gap γ (θ) between the diameter of the through hole 31B and the diameter of the bolt 27. In this manner, the nut member 21 is fixed in a state where the rotation with respect to the turning output shaft 10 is prevented.

  According to the first embodiment of the present invention configured as described above, as described above, even when the drag torque reaches the specified drag torque and the tightening of the nut member 21 is stopped, the lock plate 31 is moved to the swing output shaft. By rotating in the circumferential direction about the 10 axis, any one of the nine through holes 31B of the lock plate 31 and the screw hole 21C of the nut member 21 can be correctly aligned. Therefore, before inserting the two bolts 27 into the nine through holes 31B, the nut member 21 is prevented from rotating without the need to retighten the nut member 21 to correctly align the through holes 31B and the screw holes 21C. Can be realized. Thereby, it is not necessary to provide a strong bearing for the tightening of the nut member 21, so the housing 15 can be reduced in size, and the manufacturing cost of the bearing fixing device can be suppressed.

  In addition, the first embodiment of the present invention has a relationship of Expression (4), that is, (1/8) P (θ) <α (θ) + γ (θ), so that the spline formed on the turning output shaft 10 A gap caused by the difference between the tooth thickness of the part 10C and the tooth thickness of the spline part 31A of the lock plate 31 and a gap caused by the difference between the diameter of the through hole 31B and the diameter of the bolt 27 can be used. Therefore, for example, a manufacturing error or the like occurs in the nine through holes 31B provided in the lock plate 31, and even if the lock plate 31 is rotated in the circumferential direction around the axis of the turning output shaft 10, these through holes are provided. Even when 31B and the screw hole 21C of the nut member 21 cannot be made to coincide with each other, the screw plate 21C of the nut member 21 is securely passed through the screw hole 21C of the nut member 21 by finely adjusting the lock plate 31 by rotating the gap 31B. It can be correctly aligned with any of the holes 31B.

  Further, according to the first embodiment of the present invention, the notches 28 that do not interfere with the rotation of the lock plate 31 are provided in the convex portion 21 </ b> B provided on the nut member 21, so that the nine through holes 31 </ b> B of the lock plate 31 are provided. Even if the lock plate 31 is rotated in the circumferential direction around the axis of the turning output shaft 10 in order to match the screw hole 21 </ b> C of the nut member 21 with the lock plate 31, Since it does not interfere with the end portion where the notch portion 28 is formed, the rotation range of the lock plate 31 can be utilized to the maximum, and the use of the through holes 31B formed at both ends of the lock plate 31 is prevented. Absent.

  Further, the first embodiment of the present invention is a hydraulic pressure having a traveling body 2, a revolving body 4 disposed on the traveling body 2, and a swiveling device 6 provided between the traveling body 2 and the revolving body 4. Since the excavator 1 is provided, the excavator 1 can be effectively used in construction machines that are frequently used for excavation work of earth and sand provided with the swivel device 6. Of course, the present invention can also be applied to various construction machines different from the hydraulic excavator 1.

  In the first embodiment of the present invention, the case where nine through holes 31B are formed in the lock plate 31 has been described. However, the number of the bolts 27 may be larger than the number of the through holes 31B. In this case, from the formulas (1) and (2), the greater the number H of the through holes 31B, the greater the number W of possible arrangement states of the lock plate 31 with respect to the screw holes 21C of the nut member 21. And any one of the through-holes 31B and the screw hole 21C of the nut member 21 can be easily matched.

  Moreover, although 1st Embodiment of this invention demonstrated the case where the number V of the screw hole 21C and the bolt 27 of the nut member 21 was two, it may not be two but may be three or more. Thereby, since the force which fastens the lock plate 31 to the nut member 21 increases, sufficient strength of the lock plate 31 can be ensured, and stable and highly reliable rotation prevention of the nut member 21 can be realized.

[Second Embodiment]
FIG. 6 is a cross-sectional view showing the mounting state of the second embodiment of the bearing fixing device for the construction machine according to the present invention, and FIG. 7 is a diagram showing the configuration of the second embodiment of the bearing fixing device for the construction machine according to the present invention. FIG. 8 is a diagram for explaining a usage state of the second embodiment of the bearing fixing device for the construction machine according to the present invention.

  As shown in FIGS. 6 and 7, the second embodiment of the bearing fixing device for a construction machine according to the present invention is different from the first embodiment of the present invention in that the surface of the lock plate 35 is used and the back surface is used. In any case of use, the lock plate 35 has a pitch β (θ) set in advance in relation to the pitch P (θ) of the spline portion 10C formed on the turning output shaft 10 and the number of bolts 27. A plurality of through holes 31B larger than V, for example, the number V of the bolts 27 is two, and five through holes 35B (H = 5) larger than the number of the bolts 27 (V = 2) are provided in the swivel output shaft 10. This is provided in the circumferential direction centering on the axis, and the other configuration is the same as that of the first embodiment.

  Further, in the case of the second embodiment of the bearing fixing device for a construction machine according to the present invention, the four relational expressions (1) to (4) described above satisfy the expression (2) instead of the following expression (2a). And

W = 2 (C + 1) (2a)
In this case, from H = 5 and V = 2, from Equation (1), C = 3, and from Equation (2a), W = 8. Further, the expression (3) is β (θ) = (7/8) P (θ), and the expression (4) is (1/8) P (θ) <α (θ) + γ (θ).

  When the second embodiment of the bearing fixing device for a construction machine according to the present invention is used, the nut member 21 is screwed into the turning output shaft 10 while the housing 15 is rotated relative to the turning output shaft 10. After preload is applied to 19 and 20 and the drag torque reaches the specified drag torque and the tightening of the nut member 21 is stopped, as shown in FIG. The spline portion 10A of the lock plate 35 is engaged with the spline portion 10C formed on the shaft 10, and any two of the five through holes 35B provided in the lock plate 35 and the two screw holes 21C of the nut member 21 are respectively connected. Match. At this time, when any two of the through holes 35B and the two screw holes 21C of the nut member 21 do not coincide with each other, the lock plate 35 is turned upside down and the back surface portion 35b is turned up to be formed on the turning output shaft 10. The spline portion 35A of the lock plate 35 is engaged with the spline portion 10C, and any two of the five through holes 35B provided in the lock plate 35 and the two screw holes 21C of the nut member 21 are made to coincide with each other. That is, the lock plate 35 is installed in any one of the eight arrangement states (W = 8) of (a) to (h) shown in FIG. 8 with respect to the two screw holes 21C of the nut member 21, Any two of these through holes 35B and the two screw holes 21C of the nut member 21 are made to coincide with each other.

  Then, with the through holes 35B and the screw holes 21C aligned, the two bolts 27 are inserted into the through holes 35B and fastened to the screw holes 21C, and the lock plate 35 is fixed to the nut member 21. At this time, when the two bolts 27 cannot be fastened to the screw hole 21C well, the tooth thickness of the spline portion 10C formed on the turning output shaft 10 and the lock in each of the eight states (a) to (h) shown in FIG. Fine adjustment is performed using a gap resulting from a difference α (θ) from the tooth thickness of the spline portion 35A of the plate 35 and a gap γ (θ) between the diameter of the through hole 35B and the diameter of the bolt 27. In this manner, the nut member 21 is fixed in a state where the rotation with respect to the turning output shaft 10 is prevented.

  According to the second embodiment of the present invention configured as described above, the same effects as those of the first embodiment of the present invention described above can be obtained, and both the front surface portion 35a and the back surface portion 35b of the lock plate 35 are used. Therefore, the number H of the through holes 35B can be reduced, and the lock plate 35 can be downsized. Therefore, the lock plate 35 can be easily installed on the nut member 21 and the turning output shaft 10, and the manufacturing cost of the lock plate 35 can be reduced. Moreover, since the notch part 28 provided in the convex part 21B with which the nut member 21 was provided by these things can be made small, the bearings 19 and 20 which support the turning output shaft 10, and these bearings 19 and 20 The structural stability of the pressed housing 15 can be increased.

1 Excavator (construction machine)
2 traveling body 4 revolving body 5 front working machine 6 swiveling device 9 planetary reduction mechanism 10 turning output shaft (rotating shaft)
10C Spline portion 15 Housing 19 Bearing 20 Bearing 21 Nut member 21B Convex portion 21C Screw hole 26 Lock plate 26A Spline portion 26B Through hole 27 Bolt 28 Notch portion 31 Lock plate 31A Spline portion 31B Through hole 35 Lock plate 35A Spline portion 35B Hole 35a Front surface 35b Back surface

Claims (5)

A bearing fixing device for a construction machine that fixes a bearing supporting a rotating shaft to a housing,
A nut member that has a screw hole and presses the bearing against the housing; a spline portion that engages with a spline portion formed on the rotating shaft; and a lock plate that has a through hole and is fixed to the nut member In the bearing fixing device for a construction machine, the bolt is inserted into the through hole of the lock plate and screwed into the screw hole of the nut member, and the bolt for fixing the lock plate to the nut member.
The lock plate has a pitch set in advance in relation to the pitch of the spline portion formed on the rotating shaft, and has a plurality of through holes larger than the number of bolts around the axis of the rotating shaft. A bearing fixing device for a construction machine, characterized by being provided in a circumferential direction.   2. The bearing fixing device for a construction machine according to claim 1, wherein θ is a phase based on the axis of the rotary shaft, a pitch of the spline portion formed on the rotary shaft is P (θ), and the pitch P (θ ) Is the pitch set in advance in relation to β (θ), the difference between the tooth thickness of the spline portion formed on the rotating shaft and the tooth thickness of the spline portion of the lock plate is α (θ), A construction machine having a relationship of P (θ) −β (θ) <α (θ) + γ (θ), where γ (θ) is a difference between the diameter of the through hole and the diameter of the bolt. Bearing fixing device.   3. The bearing fixing device for a construction machine according to claim 1, wherein the lock plate is formed on the rotating shaft in any case where the front surface of the lock plate is used and when the back surface is used. Construction comprising a plurality of through holes in a circumferential direction centering on the axis of the rotating shaft at a pitch set in advance in relation to the pitch of the spline portion, which is larger than the number of the bolts. Mechanical bearing fixing device.   The bearing fixing device for a construction machine according to any one of claims 1 to 3, wherein the nut member has an annular convex portion that comes into contact with a carrier included in a planetary reduction mechanism, and the convex portion includes the annular convex portion. A bearing fixing device for a construction machine, comprising a notch that does not interfere with the lock plate.   The bearing fixing device for a construction machine according to any one of claims 1 to 4, wherein the construction machine includes a traveling body, a revolving body disposed on the traveling body, the traveling body, and the revolving body. A bearing fixing device for a construction machine, characterized in that it comprises a hydraulic excavator provided with a swivel device provided between them, and constitutes a part of the swivel device.

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