JP5152267B2 - Boom rotary work machine - Google Patents

Description

  The present invention relates to a work machine that includes a boom and that rotates around a boom axis.

  As a working machine used for excavation, dismantling, removal of deposits on a molten metal container, etc., a boom rotating type in which a box-shaped boom is rotatably attached to a base machine around a boom axis is known. An example is shown in FIGS.

  This work machine is configured with a hydraulic excavator as a base body, and as shown by a two-dot chain line in FIGS. 6 and 7, an upper swing body 2 is placed on a crawler type lower traveling body 1 around an axis perpendicular to the ground. The base machine A is configured to be freely pivoted. 3 is a cabin installed on the upper swing body 2.

  The upper swing body 2 of the base machine A includes an upper frame 4, and a box-shaped boom 7 is attached to the upper frame 4 via a boom support frame 5 and a boom support mechanism 6.

  The boom support mechanism 6 has a cylindrical body portion 8, and the boom 7 is rotatably supported around the boom axis X via bearings 9, 9 on both the front and rear sides in a state where the boom 7 passes through the body portion 8. The

  In FIG. 6, B is a hoisting cylinder provided between the upper frame 4 and the body portion 8, and the body portion 8 and the boom 7 are integrally raised and lowered by the cylinder B.

  Both front and rear base flanges 10 and 11 are attached to the body portion 8 at both front and rear (boom length direction) ends. Inner rings 9a of bearings 9 and 9 (only the front side in FIG. 9) is bolted.

  As shown in FIGS. 6 and 7, the boom 7 is configured to be extendable and contractable by a proximal boom 12 and a distal boom 13 slidably fitted to the proximal boom 12 in a telescopic manner. The expansion / contraction operation is performed by an expansion cylinder (not shown) provided between 13.

  End plates 14 and 14 are fixed to the outer circumferences at both front and rear ends of the proximal boom 12, and the both end plates 14 and 14 are bolted to the outer ring 9 b (see FIGS. 8 and 9) of the bearings 9 and 9.

  6 to 8, illustration of bolts and bolt holes for connecting the base flanges 10 and 11, the bearings 9 and 9, and the end plate 14 is omitted for simplification of the drawings.

  On the other hand, the front base flange 10 is integrally provided with a motor mounting portion 15 protruding outward, and a boom rotating motor 16 (usually a hydraulic motor) is mounted on the motor mounting portion 15.

  In this case, the motor 16 is mounted on the rear surface of the motor mounting portion 15 (on the right side of each figure and on the base so as not to be damaged or damaged due to contact with a work object (for example, a molten metal pan) or thermal effects. A surface close to the machine A. Hereinafter, it is referred to as a motor mounting surface (referenced only in FIG. 9) and is mounted forward 15a.

  A pinion 17 is provided on the output shaft of the motor 16, and an external gear 18 is provided on the outer ring 9 b of the front bearing 9, and the pinion 17 and the external gear 18 mesh with each other in front of the base flange 10 to constitute a gear transmission mechanism. .

  Thus, the rotational force of the motor 16 is transmitted to the base end boom 12 via the gear transmission mechanism, the bearing 9 (outer ring 9b) and the end plate 14, and the entire boom 7 rotates around the boom axis X. Yes.

  The motor attachment portion 15 is provided with a pinion insertion hole 15b penetrating in the front-rear direction, and the pinion 17 is led out of the motor attachment portion 15 through the pinion insertion hole 15b.

  In FIG. 6, 19 is a working device (a breaker is illustrated in the figure) attached to the tip of the boom 7 (tip boom 13).

  Of the above configuration, the entire configuration excluding the mounting position of the motor 16 is shown in Patent Document 1.

JP-A-10-5988

  In the known technique for attaching the motor 16 to the motor mounting portion 15 provided on the base flange 10 as described above, machining for making the motor mounting surface 15a suitable for motor mounting avoids the occurrence of welding distortion. Therefore, the base flange 10 is machined after being welded and fixed to the body portion 8.

  In this case, the motor mounting portion 15 protrudes from the base flange 10 and the motor mounting surface 15a must be performed at a position close to the body portion 8 immediately below the body portion. Therefore, machining using a normal milling machine is required in terms of work space. This is a manual process.

  Moreover, since the motor mounting surface 15a is formed on the rear surface of the base flange 10 (motor mounting portion 15), the back surface is processed from the front surface, and the processing shape is limited.

  Furthermore, since the motor mounting portion 15 is not a simple circle but an irregular circle, the back machining itself is extremely difficult.

  From the above points, according to the known technique, there is a problem that the processing of the motor mounting surface 15a is very troublesome and the processing accuracy is poor.

  Therefore, the present invention provides a boom rotating work machine that facilitates machining of the motor mounting surface and improves machining accuracy under the condition that the motor is arranged on the rear side of the flange.

  According to the first aspect of the present invention, a base machine capable of self-propelling is provided with a boom support mechanism having a cylindrical trunk portion, and a box-shaped boom passes through the trunk portion so as to be around the boom axis. In the boom rotating work machine, wherein the base is provided with a base flange on the outer periphery of the tip, and is configured to transmit the rotational force of the motor to the boom to rotate the boom. An independent ring-shaped support flange is attached to the front surface of the flange, a motor attachment portion is provided on the outer periphery of the support flange, and the motor is attached to the rear surface of the motor attachment portion.

  According to a second aspect of the present invention, in the configuration of the first aspect, a flange coupling portion having a motor insertion hole is provided on the outer periphery of the base flange so as to project outward, and the flange coupling portion and the support flange are attached to the motor. The motor is mounted on the rear surface of the motor mounting portion by overlapping the portion with a bolt and inserting the motor into the motor insertion hole from behind.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, the base flange is coupled to the rear surface of the support flange and the bearing is coupled to the front surface in an inlay fitting state.

  According to the present invention, since the motor is not attached to the base flange as in the prior art, but is attached to an independent ring-shaped support flange, the motor mounting surface is processed before the support flange is attached to the base flange. It can be done in a single state.

  Therefore, since machining using a normal milling machine is possible, machining of the motor mounting surface is facilitated, and machining accuracy can be greatly improved.

  By the way, since the motor flange and the meshing reaction force of the gear transmission mechanism that transmits the motor rotational force to the boom act on the support flange, sufficient strength and rigidity are required. In other words, if the strength and rigidity are insufficient, the support flange will bend and the tooth contact of the gear transmission mechanism will deteriorate.

  In this case, if the strength and rigidity required by the flange alone are to be ensured, the flange thickness must be considerably increased, and the support flange is heavy and expensive.

  In this respect, according to the second aspect of the present invention, since the flange coupling portion protrudes from the outer periphery of the base flange and this flange coupling portion and the motor mounting portion of the support flange are overlapped and bolted, a thin support flange is sufficient. High strength and rigidity can be ensured.

  According to the invention of claim 3, since the rear surface of the support flange is coupled to the base flange and the front surface is coupled to the bearing in an inlay fitting state, the motor-side pinion is connected to the external gear provided on the bearing. When adopting the configuration to be combined, the base flange, the bearing, and the support flange can be accurately positioned in an appropriate positional relationship, and the accuracy of the inter-axis distance between the pinion and the external gear can be ensured.

It is a disassembled perspective view of the boom rotation drive part of the working machine which concerns on embodiment of this invention. It is a partial assembly perspective view of the part. It is an expansion perspective view of a support flange. It is a side view which partially cuts and shows a boom rotation drive part. FIG. 5 is a partially enlarged view of FIG. 4. It is a whole side view of the working machine containing a well-known technique. It is the same top view. It is a disassembled perspective view of the boom rotation drive part in a well-known technique. It is a side view which partially cuts and shows the boom rotation drive part of the part.

  An embodiment of the present invention will be described with reference to FIGS.

  In the embodiment, the following basic configuration is the same as the known technique shown in FIGS. Of the following configurations, those not shown in FIGS. 1 to 5 shall be referred to FIGS.

  (i) A base machine A is constructed in which an upper swing body 2 with a cabin 3 is mounted on a crawler-type lower traveling body 1 so as to be rotatable around an axis perpendicular to the ground.

  (ii) The upper swing body 2 includes an upper frame 4, and a box-shaped boom 7 is attached to the upper frame 4 via a boom support frame 5 and a boom support mechanism 6.

  (iii) The boom support mechanism 6 has a cylindrical body portion 8, and the boom 7 can freely rotate around the boom axis X via the front and rear bearings 9, 9 while passing through the body portion 8. Points supported by.

  (iv) The boom 7 is configured to be extendable and contractable by a base end boom 12 and a front end boom 13 slidably fitted to the base end boom 12 in a telescopic manner, and is provided between the booms 12 and 13. The point of expansion and contraction by an expansion cylinder (not shown).

  (v) End plates 14 and 14 are fixed to the outer periphery of the front and rear ends of the proximal boom 12, respectively, and both end plates 14 and 14 are bolted to the outer ring 9 b (see FIGS. 1, 4 and 5) of the bearings 9 and 9. The point to be stopped.

  (vi) A pinion 17 is provided on the output shaft of the boom rotating motor 16, and an external gear 18 is provided on the outer ring 9b of the front bearing 9, and the pinion 17 and the external gear 18 mesh with each other in front of the base flange 10. A gear transmission mechanism is configured, and the rotational force of the motor 16 is transmitted to the proximal boom 12 via the gear transmission mechanism, the bearing 9 (outer ring 9b) and the end plate 14, and the entire boom 7 rotates around the boom axis X. The point that is structured as follows.

  In the embodiment, both front and rear base flanges 20 and 21 are attached to the front and rear ends of the body portion 8, and the inner rings 9a of the bearings 9 and 9 are attached to both the base flanges 20 and 21 as in the prior art (see FIGS. 4 and 5). ) Is bolted.

  Then, the motor 16 is attached not to the front base flange 20 but to a support flange 22 newly provided as a motor attachment dedicated part.

  More specifically, a flange coupling portion 23 is integrally projected downward on the outer periphery of the front base flange 20, and a motor insertion hole 24 through which the front portion including the pinion 17 of the motor 16 is inserted into the flange coupling portion 23. Is provided.

  The support flange 22 is formed separately from the base flange 20 as a ring-shaped independent plate, and the support flange 22 is bolted to the front base flange 20 together with the bearing inner ring 9a (see FIGS. 4 and 5).

  In FIG. 1, illustrations of bolts and bolt holes are omitted.

  Here, as shown in FIG. 3 to FIG. 5, as the positioning means, the inner flange portion of the support flange 22 is provided with inlay convex portions 25, 26 projecting on both front and rear sides of the flange, and the front convex portion 25 supports the support flange 22. The bearing inner ring 9a is coupled to the support flange 22 and the base flange 20 by the rear convex portion 26 in an inlay fitting state.

  Further, a substantially rectangular plate-shaped motor mounting portion 27 projects downward on the outer periphery of the support flange 22, and the motor mounting portion 27 is bolted to the flange coupling portion 23 of the front base flange 20 in a superimposed state ( (See FIGS. 4 and 5).

  The motor mounting portion 27 has a motor mounting surface 27a formed on the rear surface and a pinion insertion hole 27b. The motor 16 abuts the motor mounting surface 27a through the motor insertion hole 24 of the base flange 20, It is bolted.

  Then, the pinion 17 attached to the output shaft of the motor 16 is led out to the front of the support flange through the pinion insertion hole 25b, and meshed with the external gear 18 of the bearing outer ring 9b to constitute a transmission gear mechanism.

  The pinion insertion holes 25b are provided on both the left and right sides of the motor mounting portion 27 so that the mounting position of the motor 16 can be selected from either left or right, but only the left side is shown here.

  Thus, since the motor 16 is not attached to the base flange 20 as in the prior art, but is attached to the independent ring-shaped support flange 22, the motor mounting surface 27 a is processed before the support flange is attached to the base flange 20. The flange 22 can be used alone.

  Therefore, since machining using a normal milling machine is possible, machining of the motor mounting surface is facilitated, and machining accuracy can be greatly improved.

  Further, since the flange coupling portion 23 projects from the outer periphery of the base flange 20 and the flange coupling portion 23 and the motor mounting portion 27 of the support flange 22 are overlapped and bolted, the support flange 22 does not have to be made much thicker. In addition, it is possible to secure sufficient strength and rigidity that can withstand the meshing reaction force of the motor weight and the gear transmission mechanism.

  On the other hand, since the rear surface of the support flange 22 is coupled to the base flange 20 and the front surface is coupled to the bearing inner ring 9a in an inlay fitting state, the external gear 18 provided on the bearing outer ring 9b is connected to the motor side as in the embodiment. When the pinion 17 is engaged, the base flange 20, the bearing 9, and the support flange 22 are accurately positioned in an appropriate positional relationship, and the distance between the axes of the pinion 17 and the external gear 18, that is, both The accuracy of meshing can be ensured.

  By the way, as the three positioning means of the base flange 20, the bearing 9 and the support flange 22, a knock pin method may be adopted instead of the above-described inlay fitting method.

  Moreover, in the said embodiment, although the case where the motor 16 was arrange | positioned under the trunk | drum 8 was taken as an example, when the motor 16 is arrange | positioned above a trunk | drum or a side, it can implement similarly to the above.

  When the support flange 22 has sufficient strength and rigidity alone, it is not necessary to overlap the motor mounting portion 27 with the flange coupling portion 23 of the base flange 20 for coupling. In this case, the flange coupling portion 23 is not necessary.

  On the other hand, the present invention can also be applied to a machine in which the boom 7 does not expand and contract.

A Base machine 1 Lower traveling body of base machine 2 Upper revolving body 4 Upper revolving body upper frame 5 Boom support frame 6 Boom support mechanism 7 Boom X Boom axis 8 Boom support mechanism body 9 Bearing 9a Bearing inner ring 9b Bearing outer ring 12 Boom proximal end boom 13 Same as tip boom 14 End plate 16 Motor for boom rotation 17 Pinion 18 External gear 20 Base flange 22 Support flange 23 Flange joint of base flange 24 Motor insertion hole 25, 26 Support Inlay convex portion of flange 27 Motor mounting portion of support flange 27a Motor mounting surface 27b Pinion insertion hole

Claims (3)

  A self-propelled base machine is provided with a boom support mechanism having a cylindrical trunk, and a box-shaped boom is rotatably supported around the boom axis while passing through the barrel. A base flange is provided on the outer periphery of the tip of the trunk, and in a boom rotary work machine configured to transmit the rotational force of the motor to the boom to rotate the boom, the front of the base flange is independent of the body flange. A boom-rotating work machine characterized in that a ring-shaped support flange is mounted, a motor mounting portion is provided on the outer periphery of the support flange, and the motor is mounted on the rear surface of the motor mounting portion.   A flange coupling portion having a motor insertion hole is provided on the outer periphery of the base flange so as to project outward, and the flange coupling portion and the motor mounting portion of the support flange are overlapped and bolted, and the motor is coupled to the base flange. 2. The boom rotating work machine according to claim 1, wherein the boom rotating work machine is inserted into the motor insertion hole from the rear and attached to the rear surface of the motor attachment portion.   3. The boom rotary work machine according to claim 1, wherein the base flange is coupled to the rear surface of the support flange and the bearing is coupled to the front surface in an inlay fitting state.

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