Patent Publication Number: US-2020299928-A1

Title: Working machine

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation application of International Application No. PCT/JP 2018/039319, filed Oct. 23, 2018, which claims priority to Japanese Patent Application No. 2017/246320, filed Dec. 22, 2017. The contents of these applications are incorporated herein by reference in their entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a working machine such as a backhoe. 
     Description of Related Art 
     The working machine disclosed in Japanese Unexamined Utility Model Publication No. S63-38293 is previously known. 
     The working machine disclosed in Japanese Unexamined Utility Model Publication No. S63-38293 includes a vehicle body provided with a traveling device, a turn base rotatably provided on the vehicle body, and a swivel joint (a rotary joint) having an inner cylinder connected to the vehicle body and an outer cylinder connected to the turn base. 
     SUMMARY OF THE INVENTION 
     A working machine according to one aspect of the present invention, includes: a traveling device having a traveling frame; a turn base plate supported on the traveling frame and configured to turn around an axis extending in a vertical direction, the turn base plate having an opening portion through which the axis extends; and a swivel joint including: an outer sleeve fixed to the turn base plate; and an inner shaft inserted to the opening portion and inserted to the outer sleeve so as to rotate about the axis, the inner shaft being configured to restrictively rotate with respect to the traveling frame. The outer sleeve has a flange portion fixed to the turn base plate on a periphery of the opening portion and covering the opening portion. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein: 
         FIG. 1  is a plan view of a working machine according to an embodiment of the present invention; 
         FIG. 2  is a side view of the working machine according to the embodiment; 
         FIG. 3  is a plan view illustrating arrangement of components mounted on the working machine according to the embodiment; 
         FIG. 4  is a plan view of a traveling frame according to the embodiment; 
         FIG. 5  is a cross-sectional side view illustrating arrangement of the traveling frame, a turn base plate, a swivel joint, the turn motor, and the like according to the embodiment; 
         FIG. 6  is a partially-enlarged view of  FIG. 5  according to the embodiment; 
         FIG. 7  is a cross-sectional front view illustrating a part of an attachment structure of the swivel joint according to the embodiment; 
         FIG. 8  is a bottom view illustrating the attachment structure of the swivel joint according to the embodiment; 
         FIG. 9  is a cross-sectional side view illustrating a part of the attachment structure of the swivel joint according to the embodiment; 
         FIG. 10  is a plan view of the swivel joint according to the embodiment; 
         FIG. 11  is a bottom view of the swivel joint according to the embodiment; 
         FIG. 12  is a view illustrating an A-A cross-section of  FIG. 10  according to the embodiment; 
         FIG. 13  is a plan view of a lower member according to the embodiment; 
         FIG. 14  is a view illustrating an A-A cross-section of  FIG. 13  according to the embodiment; 
         FIG. 15  is a view illustrating a B-B cross-section of  FIG. 13  according to the embodiment; 
         FIG. 16  is a bottom view of the lower member according to the embodiment; and 
         FIG. 17  is an explanation view illustrating action of a turn restrictor mechanism according to the embodiment. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The embodiments will now be described with reference to the accompanying drawings, wherein like reference numerals designate corresponding or identical elements throughout the various drawings. The drawings are to be viewed in an orientation in which the reference numerals are viewed correctly. 
     Hereinafter, an embodiment of the present invention will be described with appropriate reference to the drawings. 
       FIG. 1  is a schematic plan view showing the overall configuration of a working machine  1  according to the embodiment.  FIG. 2  is a schematic side view of the working machine  1 . In the embodiment, a backhoe, which is a swivel working machine, is exemplified as the working machine  1 . 
     First, the overall configuration of the working machine  1  will be described below. 
     As shown in  FIG. 1  and  FIG. 2 , the working machine  1  includes a machine body (a turn base)  2 , a traveling device  3 , and a working device  4 . A cabin  5  is mounted on the machine body  2 . A operator seat (a seat)  6  on which a driver (an operator) sits is provided inside the cabin  5 . 
     In the present embodiment, the front side of the operator sitting on the operator seat  6  (a direction indicated by an arrowed line A 1  in  FIG. 1  and  FIG. 2 ) is referred to as the front, the rear side of the operator (a direction indicated by an arrowed line A 2  in  FIG. 1  and  FIG. 2 ) is referred to as the rear, the left side of the operator (a direction indicated by an arrowed line B 1  in  FIG. 1 ) is referred to as the left, and the right side of the operator (a direction indicated by an arrowed line B 2  in  FIG. 1 ) is referred to as the right. Additionally in the explanation, the horizontal direction, which is a direction orthogonal to the front-rear direction K 1 , will be described as the machine width direction K 2  (a width direction of the machine body  2 ) (see  FIG. 1  and  FIG. 2 ). 
     The traveling device  3  is a device for supporting the machine body  2  and is configured to perform the traveling. As shown in  FIG. 1  and  FIG. 2 , the traveling device  3  includes a traveling frame  3 A, a first traveling device  3 L provided on the left side of the traveling frame  3 A, and a second traveling device  3 R provided on the right side of the traveling frame  3 A. The first traveling device  3 L and the second traveling device  3 R are crawler type traveling devices. The first traveling device  3 L is configured to be driven by the first traveling motor M 1 . The second traveling device  3 R is configured to be driven by the second traveling motor M 2 . The first traveling motor M 1  and the second traveling motor M 2  are constituted of hydraulic motors (hydraulic actuators (hydraulic devices)). 
     A dozer device  7  is attached to the front portion of the traveling device  3 . The dozer device  7  is capable of being moved up and down (the blade can be lifted and lowered) when the dozer cylinder (the hydraulic actuator (the hydraulic device)) is stretched and shortened. In addition, the dozer device  7  is capable of being swung about the vertical axis (swung between the left end portion and the right end portion of the blade) when the angle cylinder (the hydraulic actuator (the hydraulic device)) is stretched and shortened. 
     As shown in  FIG. 2 , the machine body  2  is supported on the traveling frame  3 A with a turn bearing  8  so as to be turned around a turn axis X 1 . The turn axis X 1  is an axial center extending in the vertical direction passing through the center of the turn bearing  8 . 
     As shown in  FIG. 1  and  FIG. 3 , the cabin  5  is mounted on one side (the left side portion) of the machine body  2  in the width direction K 2 . A prime mover E 1  is mounted on the other side (the right side portion) of the machine body  2  in the width direction K 2 . The prime mover E 1  is a diesel engine. The prime mover E 1  may be a gasoline engine, an LPG engine or an electric motor, or may be a hybrid type having an engine and an electric motor. 
     A hydraulic pump P 1  is provided at the rear portion of the prime mover E 1 . The hydraulic pump P 1  is configured to be driven by the prime mover E 1  and to pressurize and output the operation fluid to be used in the hydraulic driving portion. The hydraulic driving portion is, for example, a hydraulic actuator equipped in the working machine  1 . In front of the prime mover E 1 , a radiator R 1 , an oil cooler O 1  and a condenser D 1  are arranged and mounted on the machine body  2 . 
     The radiator R 1  is a cooling device configured to cool the coolant water of the prime mover E 1 , and the oil cooler O 1  is a cooling device configured to cool the operation fluid. The condenser D 1  is a cooling device (condenser) configured to cool the refrigerant of the air conditioner device (an air conditioner) installed in the working machine  1 . A cooling fan F 1  is provided between the radiator R 1  and the prime mover E 1  to generate the cooling air for cooling the prime mover E 1 . 
     As shown in  FIG. 2  and  FIG. 3 , the machine body  2  includes a base plate  9  (hereinafter, referred to as a turn base plate) that turns around the turn axis X 1 . The turn base plate  9  is made of a steel plate or the like, and constitutes the bottom of the machine body  2 . As shown in  FIG. 3 , vertical ribs  9 L and  9 R, which are reinforcing members, are provided on the center side of the upper surface of the turn base plate  9 , extending from the front to the rear. The vertical rib  9 L is arranged closer to one side from the center of the machine body  2  in the width direction K 2 , and the vertical rib  9 R is arranged closer to the other side in the width direction K 2 . In addition, the turn base plate  9  is provided with the support members and the like for supporting the vertical ribs  9 L and  9 R, as well as a mounted object such as a device mounted on the machine body  2 , thereby forming a turn frame serving as a skeleton of the machine body  2 . 
     As shown in  FIG. 1  to  FIG. 3 , a weight  10  is provided at the rear portion of the machine body  2 . The weight  10  is arranged in the rear portion of the machine body  2 , and the lower portion is attached to the turn base plate  9 . At the rear portion of the machine body  2 , a fuel tank T 1  and an operation fluid tank T 2  which are arranged side by side in the machine width direction K 2  are mounted. The fuel tank T 1  is a tank configured to store the fuel of the prime mover E 1 . The operation fluid tank T 2  is a tank configured to store the operation fluid. 
     As shown in  FIG. 3  and  FIG. 5 , the turn base plate  9  is connected to the upper portion of the turn bearing  8 , and the machine body  2  is driven to be turned by the turn motor M 3 . The turn motor M 3  is a hydraulic motor (a hydraulic actuator (a hydraulic device)). 
     As shown in  FIG. 3  and  FIG. 6 , the turn bearing  8  includes the inner race  8 A fixed to the traveling frame  3 A, the outer race  8 B fixed to the turn base plate  9 , and the ball  8 C arranged between the inner race  8 A and the outer race  8 B. Inner teeth are formed on the inner circumferential portion of the inner race  8 A, and the pinions  11  are engaged with the inner teeth. The pinions  11  are attached to the output shaft of the turn motor M 3 , and the turn motor M 3  is fixed to the turn base plate  9 . Thus, by driving the pinions  11  by the turn motor M 3 , the machine body  2  is turned. The center of the turn bearing  8  is the turning center (a turn axis X 1 ) of the machine body  2 . 
     As shown in  FIG. 1 ,  FIG. 3 , and  FIG. 5 , the swivel joint  12  is provided at the position of the turn axis X 1 . The swivel joint  12  is a hydraulic device configured to circulates the operation fluid, and is a turn coupler (a rotary joint) configured to circulate the operation fluid between the hydraulic device arranged on the machine body  2  side and the hydraulic device provided on the traveling device  3  side. 
     A turn motor M 3  is arranged in front of the swivel joint  12 . A control valve (a hydraulic device) V 1  is arranged behind the swivel joint  12 . The control valve V 1  is a hydraulic device in which control valves for controlling hydraulic actuators such as a hydraulic cylinder and a hydraulic motor mounted on the working machine  1  are integrated. The control valves constituting the control valve V 1  controls a first traveling motor M 1 , a second traveling motor M 2 , a turn motor M 3 , a dozer cylinder C 1  (see  FIG. 4 ), a swing cylinder C 2 , a boom cylinder C 3 , an arm cylinder C 4 , a bucket cylinder C 5 , for example. 
     As shown in  FIG. 3 , the machine body  2  arranges a support bracket  20  slightly to the right in the front portion from the center in the machine width direction K 2 . The support bracket  20  is fixed to the front portions of the vertical ribs  9 L and  9 R, and is provided so as to project forward from the machine body  2 . 
     As shown in  FIG. 1  and  FIG. 2 , the swing bracket  21  is attached to a front portion (a portion protruding from the machine body  2 ) of the support bracket  20  with the swing shaft  26  so as to be swingable about the vertical axis. Thus, the swing bracket  21  is configured to be turned in the machine width direction K 2  (turned horizontally around the swing shaft  26 ). 
     The working device  4  is attached to the swing bracket  21 . 
     As shown in  FIG. 2 , the working device  4  has a boom  22 , an arm  23 , and a bucket (a working tool)  24 . A base portion  22 A of the boom  22  is pivotally attached to an upper portion of the swing bracket  21  with a boom pivot shaft  27  so as to be rotatable about the horizontal axis (an axis extending in the machine width direction K 2 ). In this manner, the boom  22  is capable of being swung vertically. The arm  23  is pivotally attached to the tip end side of the boom  22  so as to be rotatable around the horizontal axis. As the result, the arm  23  can swing back and forth or up and down. The bucket  24  is provided on the tip end side of the arm  23  and is capable of performing the squeezing operation and the dumping operation. 
     The working machine  1  can be equipped with another working tool (a hydraulic attachment) configured to be driven by a hydraulic actuator instead of or in addition to the bucket  24 . Examples of other working tools include a hydraulic breaker, a hydraulic crusher, an angle broom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower. 
     The swing bracket  21  is swingable by the stretching and shortening of the swing cylinder C 2  provided inside the machine body  2 . The boom  22  is swingable by the stretching and shortening of the boom cylinder C 3 . The arm  23  is swingable by the stretching and shortening of the arm cylinder C 4 . The bucket  24  is capable of performing the squeezing operation and the dumping operation through the stretching and shortening of the bucket cylinder (a working tool cylinder) C 5 . The swing cylinder C 2 , the boom cylinder C 3 , the arm cylinder C 4 , and the bucket cylinder C 5  are constituted of hydraulic cylinders (hydraulic actuators). 
     Next, an attachment structure of the swivel joint  12  in the working machine  1  will be described below. 
     As shown in  FIG. 7  to  FIG. 12 , the swivel joint  12  has an outer sleeve  13  and an inner shaft  14 . The outer sleeve  13  is fixed to the turn base plate  9  and rotates together with the turn base plate  9 . The inner shaft  14  is provided so as to be rotatable with respect to the outer sleeve  13  about the turn axis X 1  and not to be rotatable with respect to the traveling frame  3 A. 
     First, the configurations of the turn base plate  9  and the traveling frame  3 A related to the attachment structure of the swivel joint  12  will be described below. 
     As shown in  FIG. 3  and  FIG. 6 , the turn base plate  9  has an opening portion  9 A (hereinafter, referred to as a “first opening portion  9 A”) through which the turn axis X 1  passes. The first opening portion  9 A is a circular opening centered on the turn axis X 1 . The swivel joint  12  is inserted and attached to the first opening portion  9 A. The first opening portion  9 A is provided behind the turn motor M 3 . 
     As shown in  FIG. 4  and  FIG. 5 , the traveling frame  3 A has a center frame  30 , a left side frame  30 L, and a right side frame  30 R. The left side frame  30 L is located on the left side of the center frame  30 . The right side frame  30 R is located on the right side of the center frame  30 . The front portion of the center frame  30  and the front portion of the left side frame  30 L, and the rear portion of the center frame  30  and the rear portion of the left side frame  30 L are respectively connected by a left connecting leg  30 CL. The front portion of the center frame  30  and the front portion of the right side frame  30 R, and the rear portion of the center frame  30  and the rear portion of the right side frame  30 R are respectively connected by a right connecting leg  30 CR. 
     The center frame  30  has an upper plate  31 , a lower plate  32 , a left sidewall  33 , a right sidewall  34 , a support wall  35 , and a rear wall  36 . The center frame  30  is formed of an iron plate, a steel plate, or the like. 
     A support portion  37  having an annular shape is provided on the upper surface of the upper plate  31 . The support portion  37  may be a member other than the upper plate  31 , or may be integrally formed with the upper plate  31 . The support portion  37  has a bolt insertion hole  37 A through which a bolt for attaching the inner race  8 A of the turn bearing  8  is inserted. The bolt insertion holes  37 A are formed in large numbers at intervals on the circumference centered on the turn axis X 1 . The inner race  8 A is fixed on the support portion  37  by the bolt inserted in the bolt insertion hole  37 A. 
     As shown in  FIG. 6 , the inner race  8 A is connected to the outer race  8 B with balls  8 C, and the outer race  8 B is fixed to the lower surface of the turn base plate  9 . Thereby, the center frame  30  rotatably supports the machine body  2  with the turn bearing  8 . 
     As shown in  FIG. 4  and  FIG. 6 , the upper plate  31  has an opening portion  31 A having a circular shape (hereinafter, referred to as a “second opening portion  31 A”) centered on the turn axis X 1 . The lower portion of the swivel joint  12  is inserted into the second opening portion  31 A. A first stay  38  and a second stay  39  are attached to the upper plate  31 . The first stay  38  extends from the left edge of the second opening portion  31 A to the right (in a direction toward the center of the second opening portion  31 A). The second stay  39  extends from the right edge of the second opening portion  31 A to the left (in a direction toward the center of the second opening portion  31 A). The lower portion of the swivel joint  12  is arranged between the tip (the right end) of the first stay  38  and the tip (the left end) of the second stay  39 . 
     As shown in  FIG. 5 , the lower plate  32  is provided below the upper plate  31  with a gap separating from the upper plate  31 . The left sidewall  33  connects the left portion of the upper plate  31  and the left portion of the lower plate  32 . The right sidewall  34  connects the right portion of the upper plate  31  and the right portion of the lower plate  32 . The support wall  35  connects the front portion of the upper plate  31  and the front portion of the lower plate  32 . The rear wall  36  connects the rear portion of the upper plate  31  and the rear portion of the lower plate  32 . 
     As shown in  FIG. 4 , a dozer bracket  40  for attaching the dozer device  7  is connected to the front portion of the center frame  30 . The dozer bracket  40  has dozer support portions  42 L and  42 R and a cylinder support portion  43 . The dozer support portion  42 L is provided on the left portion of the support wall  35 . The dozer support portion  42 R is provided on the right side of the support wall  35 . The dozer support portions  42 L and  42 R support the dozer. The cylinder support portion  43  is provided between the left dozer support portion  42 L and the right dozer support portion  42 R, and supports the dozer cylinder C 1 . The dozer support portions  42 L and  42 R and the cylinder support portion  43  extend forward from the support wall  35 . 
     Next, the outer sleeve  13  and the inner shaft  14  constituting of the swivel joint  12  will be described mainly with reference to  FIG. 7  to  FIG. 16 . 
     The outer sleeve  13  of the swivel joint  12  has a tubular shape, and the central axis extends vertically and coincides with the turn axis X 1 . 
     As shown in  FIG. 7  and  FIG. 9  to  FIG. 12 , the outer sleeve  13  has a sleeve body  15 , an upper member  16 , and a lower member  17 . As shown in  FIG. 7 ,  FIG. 9 , and  FIG. 12 , the sleeve body  15  has an upper tubular portion  15 A and a lower tubular portion  15 B. The sleeve body  15  has an internal hole  15 C having a substantially-cylindrical shape that vertically penetrates the upper cylinder portion  15 A and the lower cylinder portion  15 B. The upper tubular portion  15 A has a rectangular tubular shape, and a plurality of annular grooves are formed on the inner surface (on the inner circumferential surface of the inner hole  15 C). As shown in  FIG. 12 , the plurality of annular grooves include large-diameter grooves  15 D and small-diameter grooves  15 E alternately arranged in the axial direction (in the vertical direction). The lower tubular portion  15 B is formed in a cylindrical shape. The outer diameter of the lower tubular portion  15 B is smaller than the distance between two opposing outer surfaces of the upper tubular portion  15 A. The upper cylinder portion  15 A is arranged above the turn base plate  9 . The lower tubular portion  15 B has an upper portion arranged above the turn base plate  9 , and has a lower portion arranged inside the first opening portion  9 A of the turn base plate  9 . 
     As shown in  FIG. 7  and  FIG. 9 , a plurality of connection ports (ports)  15   a  to  15   k  to which the pipes (the hydraulic hoses) are connected are formed on the outer circumferential surface of the upper cylinder portion  15 A of the sleeve body  15 . The pipes connected to the connection ports  15   a  to  15   k  are connected to the hydraulic pump P 1  with the control valve V 1 . 
     As shown in  FIG. 9 ,  FIG. 10 ,  FIG. 12 , and the like, the upper member  16  is fixed to the upper portion of the sleeve main body  15  by bolts BL 1 . The upper member  16  closes the upper portion of the inner hole  15 C of the sleeve body  15 . 
     As shown in  FIG. 12 , the lower member  17  is fixed to the lower portion of the sleeve body  15  by bolts BL 2 . As shown in  FIG. 7 ,  FIG. 9 ,  FIG. 11 , and  FIG. 12 , the lower member  17  has a flange portion  17 A and an insertion portion  17 B. The flange portion  17 A is formed to have an annular shape. As shown in  FIG. 3  and  FIG. 12 , the center of the flange portion  17 A is located on the turn axis X 1 . The outer diameter of the flange portion  17 A is larger than the outer diameter of the first opening portion  9 A of the turn base plate  9 . The outer circumferential edge of the flange portion  17 A is located outside the outer edge of the sleeve main body  15  (a position separating away from the turn axis X 1 ). 
     As shown in  FIG. 6 ,  FIG. 7 ,  FIG. 9 , and the like, the lower surface of the flange portion  17 A is in contact with the upper surface of the turn base plate  9  around the first opening portion  9 A of the turn base plate  9 . As shown in  FIG. 13  to  FIG. 15 , and the like, the flange portion  17 A is formed with a bolt insertion hole  17 F into which a bolt is inserted. The bolt through holes  17 F are formed in large numbers at intervals on a circumference centered on the turn axis X 1 . As shown in  FIG. 7  and  FIG. 9 , the bolt BL 3  inserted into the bolt insertion hole  17 F is screwed into the screw hole  9 B formed around the first opening portion  9 A. In this manner, the flange portion  17 A is fixed to the turn base plate  9  around the first opening portion  9 A, and covers the first opening portion  9 A. In other words, the flange portion  17 A closes the gap formed between the first opening portion  9 A and the swivel joint  12  (covers the gap). In this manner, that configuration prevents tools, parts, fluid, dust, and the like from falling into the traveling frame  3 A from the first opening portion  9 A. 
     As shown in  FIG. 11 ,  FIG. 12 , and the like, the insertion portion  17 B has an annular shape and is provided below the flange portion  17 A. The insertion portion  17 B is formed integrally with the flange portion  17 A. The outer diameter of the insertion portion  17 B is smaller than the outer diameter of the flange portion  17 A, and is less than or equal to the outer diameter of the first opening portion  9 A of the turn base plate  9 . As shown in  FIG. 6  and  FIG. 12 , the insertion portion  17 B is inserted into the first opening portion  9 A from above. 
     As shown in  FIG. 12 , a first seal portion  44  is provided on the outer circumferential surface of the insertion portion  17 B. The first seal portion  44  seals a gap between the outer circumferential surface of the insertion portion  17 B and the inner circumferential surface of the first opening portion  9 A. That is, the outer sleeve  13  has, on the surface facing the turn base plate  9 , the first seal portion  44  that seals a gap between the outer sleeve  13  and the turn base plate  9 . The first seal portion  44  has a first seal member  45  attached to the outer circumferential surface of the insertion portion  17 B. As shown in  FIG. 14  to  FIG. 16 , an annular groove  17 C is formed on the outer circumferential surface of the insertion portion  17 B, and the first seal member  45  is attached to the groove  17 C. The first seal member  45  is made of, for example, an annular seal material such as an O-ring. The first seal portion  44  seals a gap between the outer circumferential surface of the insertion portion  17 B and the inner circumferential surface of the first opening portion  9 A. That configuration prevents fluid, dust, and the like from falling into the traveling frame  3 A from the gap between the outer circumferential surface of the insertion portion  17 B and the inner circumferential surface of the first opening portion  9 A. 
     Although the lower member  17  according to the embodiment has the flange portion  17 A and the insertion portion  17 B, the lower member  17  may have only the flange portion  17 A without the insertion portion  17 B. Even when the lower member  17  does not have the insertion portion  17 B, the flange portion  17 A is capable of providing an effect of preventing tools, parts, fluid, dust, and the like from falling from the first opening portion  9 A to the traveling frame  3 A. 
     In addition, in the present embodiment, the gap between the insertion portion  17 B and the first opening portion  9 A is sealed by providing the insertion portion  17 B of the lower member  17  to the first seal portion  44 , but not limited to this configuration. For example, a seal portion may be provided on the lower surface of the flange portion  17 A to seal a gap between the flange portion  17 A and the upper surface of the turn base plate  9 . In addition, a seal portion may be provided on both of the insertion portion  17 B and the flange portion  17 A to seal between a gap the outer sleeve  13  and the turn base plate  9 . 
     As shown in  FIG. 13  to  FIG. 16 , a center hole  17 D is formed at the center of the lower member  17 . The center hole  17 D vertically penetrates the flange portion  17 A and the insertion portion  17 B. As shown in  FIG. 12 , the upper portion of the inner shaft  14  is inserted into the center hole  17 D. As shown in  FIG. 13  and  FIG. 16 , a plurality of through holes  17 E are formed radially outside the center hole  17 D of the lower member  17 . Four through-holes  17 E are formed at intervals on the circumference centered on the turn axis X 1 . As shown in  FIG. 15 , the through hole  17 E vertically penetrates the flange portion  17 A and the insertion portion  17 B. A spot facing portion  17 F is formed below the through hole  17 E. As shown in  FIG. 12 , the bolt BL 2  is inserted into the through hole  17 E. When the bolt BL 2  is inserted into the through hole  17 E, the head of the bolt BL 2  is located in the spot facing portion  17 F, and thus does not protrude from the lower surface of the lower member  17 . The lower member  17  is fixed to the lower portion of the sleeve body  15  by the bolt BL 2 . 
     In the present embodiment, although the lower member  17  is a member different from the sleeve body  15 , the lower member  17  may be formed integrally with the sleeve body  15  through the casting or the like. In the case where the lower member  17  is formed integrally with the sleeve body  15 , the through hole  17 E and the bolt BL 2  are unnecessary. 
     As shown in  FIG. 12 , the inner shaft  14  is inserted into the center hole  17 D of the lower member  17 , and is inserted into the inner hole of the sleeve body  15 . The inner shaft  14  has a substantially columnar shape, and has a central axis extending in the vertical direction and coinciding with the turn axis X 1 . 
     As shown in  FIG. 12 , the inner shaft  14  has an upper shaft portion  18  and a lower shaft portion  19 . The upper shaft portion  18  has a large diameter portion  18 A and a small diameter portion  18 B. The large diameter portion  18 A and the small diameter portion  18 B are formed alternately in the axial direction (in the vertical direction). The large diameter portion  18 A and the small diameter portion  18 B are respectively arranged in a plurality of annular grooves formed on the inner circumferential surface of the sleeve body  15 . The large diameter portion  18 A is arranged in the small diameter groove  15 E. The small diameter portion  18 B is arranged in the large diameter groove  15 D. The lower portion of the upper shaft portion  18  is inserted through the center hole  17 D of the lower member  17  of the outer sleeve  13  and through the first opening portion  9 A of the turn base plate  9 . 
     As shown in  FIG. 12 , the seal members  60  and  61  are arranged between the outer circumferential surface of the upper shaft portion  18  and the inner circumferential surface of the sleeve body  15 . The seal member  60  is arranged between the outer circumferential surface of the upper shaft portion  18  and the inner circumferential surface of the upper cylindrical portion  15 A of the sleeve body  15 . The seal member  61  is arranged between the outer circumferential surface of the upper shaft portion  18  and the inner circumferential surface of the lower tubular portion  15 B of the sleeve body  15 . 
     The lower shaft portion  19  is formed integrally with the upper shaft portion  18 , and extends downward from the lower portion of the upper shaft portion  18 . The lower shaft portion  19  is formed to have a columnar shape having a smaller diameter than the diameter of the first opening portion  9 A of the turn base plate  9 , and is arranged below the turn base plate  9 . A interposition member  62  having a flat annular shape is provided between the upper surface of the lower shaft portion  19  and the lower surface of the outer sleeve  13 . The interposition member  62  fills the gap between the upper surface of the lower shaft portion  19  and the lower surface of the outer sleeve  13 . 
     As shown in  FIG. 7 ,  FIG. 9  and  FIG. 11 , a first flat portion  46  and a third flat portion  48  are provided on the outer circumferential surface of the lower shaft portion  19 . The first flat portion  46  and the third flat portion  48  are formed by cutting out the lowermost portion of the outer circumferential surface of the lower shaft portion  19 . The third flat portion  48  is provided at a position different from the first flat portion  46  in the circumferential direction of the outer circumferential surface of the lower shaft portion  19 . In particular, the first flat portion  46  and the third flat portion  48  are provided at the same position (the same height) in the axial direction of the inner shaft  14  and are different by 180° in the circumferential direction. In the case of the present embodiment, the first flat portion  46  is provided on the left side of the outer circumferential surface of the lower shaft portion  19 , and the third flat portion  48  is provided on the right side of the outer circumferential surface of the lower shaft portion  19 . The first flat portion  46  and the third flat portion  48  are surfaces parallel to each other, and extend in the front-rear direction. The lengths of the first flat portion  46  and the third flat portion  48  in the front-rear direction are longer than the radius of the lower shaft portion  19 . 
     As shown in  FIG. 7  and  FIG. 8 , the traveling frame  3 A includes a second flat portion  47  facing the first flat portion  46  and includes a fourth flat portion  49  facing the third flat portion  48 . As shown in  FIG. 4 ,  FIG. 7 , and  FIG. 8 , the second flat portion  47  is provided on the first member  58  fixed to the first stay  38  of the traveling frame  3 A. The fourth flat portion  49  is provided on the second member  59  fixed to the second stay  39  of the traveling frame  3 A. The first member  58  is a rectangular parallelepiped member, and extends to the left of the second opening portion  31 A in the front-rear direction. The second member  59  is a rectangular parallelepiped member, and extends to the right of the second opening portion  31 A in the front-rear direction. The second flat portion  47  is the left side surface of the first member  58 . The fourth flat portion  49  is the right side surface of the second member  59 . The second flat portion  47  and the fourth flat portion  49  face each other with the turn axis X 1  interposed therebetween. The second flat portion  47  and the fourth flat portion  49  are planes parallel to each other, and extend in the front-rear direction. 
     The first member  58  has only to have the second flat portion  47 , and the shape is not limited to the rectangular parallelepiped shape. The second member  59  only needs to have the fourth flat portion  49 , and the shape thereof is not limited to the rectangular parallelepiped shape. In addition, the first member  58  and the second member  59  may be connected to form an integral member. In addition, the first member  58  may be a member integrated with the first stay  38 , and the second member  59  may be a member integrated with the second stay  39 . 
     Additionally in the case of the present embodiment, the first flat portion  46 , the second flat portion  47 , the third flat portion  48 , and the fourth flat portion  49  are formed as surfaces extending in the front-rear direction, but may be formed as surfaces extending in other directions (for example, extending in the machine width direction). 
     In a state in which the turn base plate  9  shown in  FIG. 1  and  FIG. 2  does not turn with respect to the traveling frame  3 A (a state in which the operator seat  7  faces forward), the first flat portion  46  and the second flat portion  47  are in contact with each other. Alternatively, the third flat portion  48  and the fourth flat portion  49  are in contact with or close to each other. In particular, a configuration where the first flat portion  46  and the second flat portion  47  are close to each other and the third flat portion  48  and the fourth flat portion  49  are close to each other (a first configuration), a configuration where either one of a pair of the first flat portion  46  and the second flat portion.  47  and a pair of the third flat portion  48  and the fourth flat portion  49  is in contact with each other and the other is in proximity with each other (a second configuration), or a configuration where the first flat portion  46  and the second flat portion.  47  are contact with each other and the third flat portion  48  and the fourth flat portion  49  are in contact with each other (a third configuration) is employed. 
     As shown in  FIG. 7 , in the case of the embodiment, the first configuration is employed. In particular, the first flat portion  46  and the second flat portion  47  are close to each other, and a gap G 1  is formed between the first flat portion  46  and the second flat portion  47 . The third flat portion  48  and the fourth flat portion  49  are close to each other, and a gap G 2  is formed between the third flat portion  48  and the fourth flat portion  49 . It is preferable that the gaps G 1  and G 2  are each set to about several mm (for example, about 1 mm to 3 mm). The gaps G 1  and G 2  serve as clearances (spaces) that facilitate the operation of inserting the lower shaft portion  19  of the inner shaft  14  between the second flat portion  47  and the fourth flat portion  49 . The gaps G 1  and G 2  allow the inner shaft  14  to rotate about the turn axis X 1  only by a slight angle (for example, about 1° to 3°), but do not allow free rotation. 
     When the outer sleeve  13  rotates about the turn axis X 1  together with the turn base plate  9  from the state where the first flat portion  46  faces the second flat portion  47  and is close to the second flat portion  47  and the third flat portion  48  faces the fourth flat portion  49  and is close to the fourth flat portion  49  (see the left diagram of  FIG. 17 ), the first flat portion  46  comes into contact with the second flat portion  47  and the third flat portion  48  comes into contact with the fourth flat portion  49  (see the right diagram of  FIG. 17 ). In this manner, the rotation of the inner shaft  14  is restricted (blocked). As described above, the first flat portion  46 , the second flat portion  47 , the third flat portion  48 , and the fourth flat portion  49  constitute a turn restrictor mechanism for restricting the rotation of the inner shaft  14  with respect to the traveling frame  3 A (for making the inner shaft non-rotatable). 
     As described above, in the case of the present embodiment, the turn restrictor mechanism has two flat portions (the first flat portion  46  and the third flat portion  48 ) provided on the inner shaft  14  and has two flat portions (the second flat portion  47  and the fourth flat portion  49 ) provided on the traveling frame  3 A. However, the configuration of the turn restrictor mechanism is not limited thereto. 
     For example, the turn restrictor mechanism may be constituted of one flat portion provided on the inner shaft  14  and one flat portion provided on the traveling frame  3 A. One flat portion (for example, the first flat portion  46 ) provided on the inner shaft  14  and one flat portion (for example, the second flat portion  47 ) provided on the traveling frame  3 A are provided at positions facing each other. In this case, the rotation of the inner shaft  14  with respect to the traveling frame  3 A is restricted by the contact of the one flat portion provided on the traveling frame  3 A with the one flat portion provided on the inner shaft  14 . 
     In addition, for example, the turn restrictor mechanism may be constituted of three or more flat portions provided on the inner shaft  14  and three or more flat portions provided on the traveling frame  3 A. The three or more flat portions provided on the inner shaft  14  and the three or more flat portions provided on the traveling frame  3 A are provided at positions facing each other. As an example, the turn restrictor mechanism may employ a configuration where four flat portions are provided on the inner shaft  14  at the same position (the same height) in the axial direction of the inner shaft  14  and at positions different by 90° in the circumferential direction and where the traveling frame  3 A is provided with other four flat portions at positions facing the other four flat portions. In this case, the rotation of the inner shaft  14  with respect to the traveling frame  3 A is restricted by contacting the four flat portions provided on the traveling frame  3 A with the four flat portions provided on the inner shaft  14 . 
     As shown in  FIG. 11 , the lower surface of the lower shaft portion  19  of the inner shaft  14  is provided with a plurality of connection ports (ports)  19   a  to  19   k  to which pipes (hydraulic hoses) connected to hydraulic equipment arranged below the turn base plate  9  are connected. The connection ports  19   a  to  19   k  communicate with the connection ports  15   a  to  15   k  through a fluid tube formed inside the sleeve body  15 . In particular, the connection port  19   a  communicates with the connection port  15   a . The connection port  19   b  communicates with the connection port  15   b . The connection port  19   c  communicates with the connection port  15   c . The connection port  19   d  communicates with the connection port  15   d . The connection port  19   e  communicates with the connection port  15   e . The connection port  19   f  communicates with the connection port  15   f . The connection port  19   g  communicates with the connection port  15   g . The connection port  19   h  communicates with the connection port  15   h . The connection port  19   i  communicates with the connection port  15   i . The connection port  19   j  communicates with the connection port  15   j . The connection port  19   k  communicates with the connection port  15   k.    
     A drain pipe for returning the return fluid from the first traveling motor M 1  and the second traveling motor M 2  to the operation fluid tank T 2  is connected to the connection port  19   a . A pipe for circulating the operation fluid used to shorten the angle cylinder is connected to the connection port  19   b . A pipe through which the operation fluid for extending the angle cylinder is circulated is connected to the connection port  19   c . The connection port  19   d  is connected to a pipe through which the operation fluid for backward traveling of the second traveling motor M 2  flows. The connection port  19   e  is connected to a pipe that circulates the operation fluid for reverse traveling of the first traveling motor M 1 . The connection port  19   f  is connected to a pipe through which the operation fluid for forward driving of the second traveling motor M 2  is circulated. The connection port  19   g  is connected to a pipe through which the operation fluid for forward driving of the first traveling motor M 1  flows. A pipe for circulating the operation fluid for shortening the dozer cylinder C 1  is connected to the connection port  19   h . A pipe that circulates the operation fluid for extending the dozer cylinder C 1  is connected to the connection port  19   i . The connection port  19   j  is connected to a pipe through which the operation fluid for transmitting the boom operating pilot pressure for releasing the holding lock valve of the dozer cylinder C 1  is circulated. The connection port  19   k  is connected to a pipe through which the operation fluid for shifting the first traveling motor M 1  and the second traveling motor M 2  flows. 
     Referring to  FIG. 11 , the arrangement of the plurality of connection ports  19   a  to  19   k  in the lower shaft portion  19  will be described. One connection port (the connection port  19   a ) is arranged such that the center thereof is located at the turn axis X 1 . Four connection ports  19   d ,  19   e ,  19   f , and  19   g  are arranged around the connection port  19   a  such that the centers of the connection ports  19   d ,  19   e ,  19   f , and  19   g  are located on a concentric circle CC 1  whose center is the turn axis X 1 . The four connection ports  19   d ,  19   e ,  19   f , and  19   g  are arranged such that the intervals between the adjacent connection ports are uneven in the direction along the concentric circle CC 1 . In particular, the distance between the connection ports  19   d  and  19   e  is the largest, the distance between the connection ports  19   d  and  19   f  and the distance between the connection ports  19   e  and  19   g  are the second largest, and the distance between the connection ports  19   f  and  19   g  are the smallest. 
     A connection port  19   j  is arranged between the connection port  19   d  and the connection port  19   e  in the direction around the turn axis X 1 . The connection port  19   c  is arranged between the connection port  19   d  and the connection port  19   f . The connection port  19   b  is arranged between the connection port  19   e  and the connection port  19   g . The connection port  19   k  is arranged between the connection port  19   f  and the connection port  19   g . The connection port  19   j  is arranged at a position overlapped with the concentric circle CC 1 . The connection ports  19   b ,  19   c ,  19   k  are arranged outside the concentric circle CC 1 . That is, the connection port  19   j  is located closer to the turn axis X 1  than the connection ports  19   b ,  19   c ,  19   k . The center of the connection port  19   j  and the center of the connection port  19   k  are arranged on the same straight line L 1  that extends in the front-rear direction through the turn axis X 1 . The distance between the center of the connection port  19   j  and the turn axis X 1  is shorter than the distance between the center of the connection port  19   k  and the turn axis X 1 , shorter than the distance between the center of the connection port  19   b  and the turn axis X 1 , and shorter than the distance between the center of the connection port  19   c  and the turn axis X 1 . 
     The connection port  19   h  is arranged between the connection port  19   d  and the connection port  19   j  in the direction around the turn axis X 1 . The connection port  19   i  is arranged between the connection port  19   e  and the connection port  19   j  in the direction around the turn axis X 1 . The connection ports  19   h  and  19   i  are arranged at positions outside the other connection ports (the connection ports other than the connection ports  19   h  and  19   i ) (arranged at positions separating from the turn axis X 1 ). The centers of the connection ports  19   b  and  19   c  are arranged on a concentric circle CC 2  centered on the turn axis X 1 . The centers of the connection ports  19   h  and  19   i  are arranged on a concentric circle CC 3  centered on the turn axis X 1 . The relation between the diameters of the concentric circles CC 1 , CC 2 , CC 3  is represented by CC 1 &lt;CC 2 &lt;CC 3 . The diameters of the connection ports  19   b ,  19   c ,  19   j , and  19   k  are smaller than the diameters of the other connection ports  19   a ,  19   d ,  19   e ,  19   f ,  19   g ,  19   h , and  19   i.    
     The connection ports  19   a  to  19   k  can be arranged in a narrow space on the bottom surface of the lower shaft portion  19  by arranging the plurality of connection ports  19   a  to  19   k  as described above. Thus, even in the configuration in which the outer circumferential surface of the lower shaft portion  19  is cut out to form the flat portions (the first flat portion  46  and the third flat portion  48 ), the connection ports  19   a  to  19   k  can be surely arranged on the bottom surface of the lower shaft portion  19 . 
     As shown in  FIG. 6 , a grease bath  50  is provided between the turn base plate  9  and the traveling frame  3 A. The grease bus  50  is arranged below the turn base plate  9  and above the traveling frame  3 A. 
     The grease bath  50  has an upper tubular portion  51 , a first horizontal portion  52 , an inclined portion  53 , a second horizontal portion  54 , and a lower tubular portion  55 . The upper cylindrical portion  51  is arranged along the outer circumferential surface of the upper portion of the lower shaft portion  19  of the inner shaft  14 . The first horizontal portion  52  extends outward from the upper tubular portion  51  (separates away from the turn axis X 1 ). The inclined portion  53  extends obliquely downward from the outer end portion of the first horizontal portion  52 . In particular, the inclined portion  53  extends so as to move downward as it is separated from the inner shaft  14 . The second horizontal portion  54  extends outward from the lower end of the inclined portion  53 . The lower tubular portion  55  extends downward from the outer end of the second horizontal portion  54  along the inner circumferential surface of the support portion  37 . 
     The space S 1  surrounded by the upper tubular portion  51  of the grease bath  50 , the first horizontal portion  52 , the inclined portion  53 , the second horizontal portion  54 , the turn base plate  9  and the turn bearing  8  is filled with the grease to form a grease reservoir. The inner race  8 A of the turn bearing  8  and the pinion  11  attached to the output shaft of the slewing motor M 3  is engaged with each other in the grease reservoir, thereby ensuring the lubricity between the inner race  8 A and the pinion  11 . 
     As shown in  FIG. 6 , the second seal portion  56  is provided on the outer circumferential surface of the lower shaft portion  19  of the inner shaft  14 . The second seal portion  56  is provided below the turn base plate  9  and above the turn restrictor mechanism (the first flat portion  46 , the second flat portion  47 , the third flat portion  48 , the fourth flat portion  49 ). The second seal portion  56  seals a gap between the outer circumferential surface of the inner shaft  14  and the inner circumferential surface of the grease bath  50 . In particular, the second seal portion  56  seals a gap between the outer circumferential surface of the lower shaft portion  19  of the inner shaft  14  and the inner circumferential surface of the upper tubular portion  51  of the grease bath  50 . The second seal portion  56  has a second seal member  57  attached to the outer circumferential surface of the lower shaft portion  19 . An annular groove  19 A is formed on the outer circumferential surface of the lower shaft portion  19 , and the second seal member  57  is attached to a concave groove  19 A. The second seal member  57  is made of, for example, an annular seal material such as an O-ring. The outer circumferential surface of the lower shaft portion  19  and the inner circumferential surface of the grease bath  50  are sealed by the second seal portion  56 , and thus it is possible to prevent the grease and the fluid from leaking out between the inner shaft  14  and the grease bath  50 . 
     The configuration of the second seal portion  56  is not limited to the above-described configuration. For example, the outer circumferential surface of the lower shaft portion  19  is formed to be an outer circumferential surface having no concave groove  19 A, and the second seal member  57  formed of an elastic band (a rubber band or the like) may be attached. 
     The working machine  1  according to the embodiment has the following effects. 
     The working machine  1  includes: the traveling device  3  having the traveling frame  3 A; the turn base plate  9  supported on the traveling frame  3 A and configured to turn around an axis extending in the vertical direction, the turn base plate  9  having an opening portion (a first opening portion)  9 A through which the axis extends; and the swivel joint  12  including: the outer sleeve  13  fixed to the turn base plate  9 ; and the inner shaft  14  inserted to the opening portion  9 A and inserted to the outer sleeve  13  so as to rotate about the axis, the inner shaft  14  being configured to restrictively rotate with respect to the traveling frame  3 A. The outer sleeve  13  has the flange portion  17 A fixed to the turn base plate  9  on a periphery of the opening portion  9 A and covering the opening portion  9 A. 
     According to the configuration, since the outer sleeve  13  of the swivel joint  12  has the flange portion  17 A that is fixed to the turn base plate  9  around the opening portion  9 A and covers the opening portion  9 A, it is possible to prevent the parts and tools from falling from the opening portion  9 A provided on the turn base plate  9  and to prevent the fluid from dropping from the opening portion  9 A. 
     In addition, the inner shaft  14  has an outer diameter smaller than an inner diameter of the opening portion  9 A. The flange portion  17 A is fixed to an upper surface of the turn base plate  9  on the periphery of the opening portion  9 A. 
     According to the configuration, the swivel joint  12  can be removed upward in removing the swivel joint  12  from the turn base plate  9 . Thus, the swivel joint  12 , which is a heavy object, can be lifted and removed, and thus the upward removing can be performed more easy compared to the downward removing of the swivel joint  12 . In addition, when the swivel joint  12  is attached to the turn base plate  9 , it can be attached from above the turn base plate  9 , so that the attachment can be easily performed. Also, by removing the swivel joint  12  in the upward direction, the fluid does not drip during the removing of the swivel joint  12 , and the worker or the like can avoid the dirt. 
     In addition, the working machine  1  includes the turn restrictor mechanism to restrict rotation of the inner shaft  14  with respect to the traveling frame  3 A. The turn restrictor mechanism has: the first flat portion  46  provided on an outer circumferential surface of the inner shaft  14 ; and the second flat portion  47  provided to the traveling frame  3 A, and opposed to the first flat portion  46  and contacted to the first flat portion  46  to restrict the rotation of the inner shaft  14  with respect to the traveling frame  3 A. 
     According to the configuration, the inner shaft  14  can be prevented from rotating with respect to the traveling frame  3 A with a simple configuration in which the inner shaft  14  and the traveling frame  3 A are provided with the flat portions (the first flat portion  46  and the second flat portion  47 ). Thus, a special stopper or the like for stopping the inner shaft  14  from rotating with respect to the traveling frame  3 A is not required. In addition, since the rotation can be stopped by the contact between the flat portions (the first flat portion  46  and the second flat portion  47 ), the turn restrictor mechanism can receive a large rotation torque, and thus the turn restrictor mechanism is prevented from being damaged. 
     In addition, the turn restrictor mechanism has: the third flat portion  48  provided to a position different from a position of the first flat portion in a circumferential direction of the outer circumferential surface of the inner shaft  14 ; and the fourth flat portion  49  provided to the traveling frame  3 A, and opposed to the second flat portion  47  and contacted to the second flat portion  47  to restrict the rotation of the inner shaft  14  with respect to the traveling frame  3 A. 
     According to the configuration, in addition to the contact between the first flat portion  46  and the second flat portion  47 , the contact between the third flat portion  48  and the fourth flat portion  49  can also restrict the rotation of the inner shaft  14  with respect to the traveling frame  3 A. Thus, the inner shaft  14  can be reliably prevented from rotating with respect to the traveling frame  3 A. 
     In addition, the outer sleeve  13  has the first seal portion  44  provided on the surface opposed to the turn base plate  9 , the first seal portion  44  sealing between the outer sleeve  13  and the turn base plate  9 . 
     According to the configuration, the gap between the outer sleeve  13  and the turn base plate  9  can be sealed by the first seal portion  44 , so that the fluid, dust, and the like can be prevented from falling from the gap to the traveling frame  3 A through the opening portion  9 A. 
     In addition, the outer sleeve  13  has the inserting portion  17 B inserted to the opening portion  9 A. The first seal portion  44  is provided on the outer circumferential surface of the inserting portion and seals between the outer circumferential surface and the inner circumferential surface of the opening portion  9 A. 
     According to the configuration, the gap between the outer circumferential surface of the insertion portion  17 B and the inner circumferential surface of the first opening portion  9 A is sealed by the first seal portion  44 , so that the fluid, dust, and the like can be prevented from falling from the gap to the traveling frame  3 A. In addition, by providing the first seal portion  44  on the outer circumferential surface of the insertion portion  17 B, the outer diameter of the swivel joint  12  can be made smaller compared to a diameter provided when the seal portion is provided on the lower surface of the flange portion  17 A or the like. In this manner, the turn motor M 3  can be arranged close to the swivel joint  12  while preventing the turn motor M 3  and the swivel joint  12  from interfering with each other. 
     In addition, the working machine  1  includes the grease bath  50  provided between the turn base plate  9  and the traveling frame  3 A. The outer circumferential surface of the inner shaft  14  has the second seal portion  56  sealing between the outer circumferential surface and the inner circumferential surface of the grease bath  50 . 
     According to the configuration, since the gap between the outer circumferential surface of the lower shaft portion  19  and the inner circumferential surface of the grease bath  50  is sealed by the second seal portion  56 , it is possible to prevent the grease or fluid from leaking out from the gap. In addition, since the lower shaft portion  19  of the inner shaft  14  is prevented from rotating by the turn restrictor mechanism, the second seal portion  56  does not slide with respect to the grease bath  50 . In this manner, the excellent sealing performance can be ensured, and the durability of the second seal portion  56  can be improved. 
     In the above description, the embodiment of the present invention has been explained. However, all the features of the embodiment disclosed in this application should be considered just as examples, and the embodiment does not restrict the present invention accordingly. A scope of the present invention is shown not in the above-described embodiment but in claims, and is intended to include all modifications within and equivalent to a scope of the claims.