TWI784677B - Wheel advance and retreat device and tire testing machine with wheel advance and retreat device - Google Patents

Abstract

The present invention can reduce the influence of the vibration of the device on the measured values when the tires with a larger size than ordinary passenger car tires are tested. The drum advancing and retreating device (400) has: a rotating drum (4) abutting against the tire; a drum housing (40) rotatably supporting the rotating drum (4); a chassis (100); a pair of ball screws ( 153); a pair of ball nuts (155); and a pair of linear guides (161). The underframe (100) is capable of advancing and retreating to support the drum housing (40). The base frame (100) has a plurality of vertical plates including a pair of first vertical plates arranged directly under the pair of ball screws (153) and a pair of second vertical plates arranged right under the pair of linear guides (161). board (115).

Description

Wheel advance and retreat device and tire testing machine equipped with wheel advance and retreat device

The present invention relates to a drum advancing and retreating device for advancing and retreating a rotating drum toward a tire for a predetermined test of a tire, and a tire testing machine equipped with the drum advancing and retreating device.

Conventionally, tire testing machines for measuring the uniformity of tires and the like are known. This tire testing machine has: a main shaft capable of supporting the rotation of the tire around a rotation center shaft extending in an up and down direction; on the outer surface of the tire; and a load sensor that measures the load applied to the rotating drum. When the tire installed on the main shaft is filled with air to push the rotating drum to the outer surface of the tire, the tire is rotated by the main shaft, and the load sensor installed on the shaft portion of the rotating drum measures the load variation data of the tire. Based on the measured load variation data, the uniformity of the tire is evaluated.

As mentioned above, in order to measure the load variation during tire rotation by the load cell in the tire testing machine, the device is required to have sufficient rigidity. Especially when the rigidity of the device is insufficient, the vibration of the device will be transmitted to the load cell and affect the measured value. Therefore, in the Japanese Industrial Standard JIS D4233-2001, the group standard JASO C67-2000, SAE J332REV. NOV2002, etc., the vibration suppression device specifications are established so that the measured value of the load sensor will not be affected.

Patent Document 1 discloses a drum advancing and retreating device that enables a rotating drum to advance and retreat relative to the ground of a tire. This device includes: a base fixed to a test site, and a bracket that rotatably supports a rotating drum and is capable of advancing and retreating relative to the base. The base has a box shape extending in the front-rear direction. Furthermore, the base has a pair of rails respectively extending in the front-rear direction arranged on the upper surface thereof, and a ball screw extending in the front-rear direction between the pair of rails. On the other hand, the brackets each have a bearing block disposed on the lower surface thereof and engaged with the pair of rails, respectively, and a nut engaged with the ball screw. When the ball screw is rotated, its rotational driving force is transmitted to the bracket through the nut, so that the bracket moves forward and backward along the pair of rails. As a result, the rotating drum rotatably supported by the bracket can abut against the outer peripheral surface of the tire. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese PCT Publication No. 2018-504586

[Problem to be solved by the invention]

In the structure of the drum advancing and retreating device described in Patent Document 1, when testing a tire larger than that of an ordinary passenger car, the vibration of the device is insufficient to measure the load cell. Value issues. Specifically, the international standard ISO13326 1998 specifies the diameter of the rotating hub for tires for ordinary passenger cars and large-diameter tires for trucks and buses, and the diameter of rotating hubs for tires for ordinary passenger cars. The wheel diameter is in the range of 830 mm to 1000 mm (reference value 854 mm), and the wheel diameter of the rotating wheel wheel of tires for trucks and buses is in the range of 1520 mm to 1710 mm (reference value 1600 mm). In the latter case, the weight of the rotating drum becomes very heavy. Therefore, when the rigidity of the device is low and the natural frequency is low, the device tends to vibrate, and the vibration tends to affect the measured value of the load cell. The technology described in Patent Document 1 does not disclose specific techniques such as maintaining the rigidity of the base for the above-mentioned conditions. Therefore, when testing a tire larger than that of an ordinary passenger car, there may be a relative measurement value that cannot be ignored. The problem of the impact of vibration on the device. [Outline of Invention]

The present invention was developed in view of the above-mentioned problems, and provides a wheel advancing and retreating device and a tire testing machine equipped with the wheel advancing and retreating device, even when testing a tire larger than that of an ordinary passenger car, it can still The purpose is to reduce the influence of the vibration of the device on the measured value. [Means used to solve the problem]

According to the present invention, there is provided a drum advancing and retreating device included in a tire testing machine in which the rotation center axis of the tire is extended in the vertical direction in a tire testing position and the tire is in a horizontal position at the above-mentioned rotation center. Rotate around the axle and carry out the predetermined test on the above tire. The drum advancing and retreating device includes: a cylindrical rotating drum, a drum housing, a chassis, a load detector, at least one ball screw, a driving source, at least one ball nut, and a plurality of linear guides. The rotating drum has a drum shaft extending in the vertical direction and a drum peripheral surface abutting against the peripheral surface of the tire. The drum housing rotatably supports the rotating drum around the shaft of the drum. The bottom frame is configured with a frame top plate below the above-mentioned drum housing. The chassis supports the wheel housing movable in the front-rear direction so that the wheel peripheral surface of the rotating wheel comes into contact with and separates from the wheel peripheral surface of the tire. The load detector can detect the load from the tire on the rotating drum. At least one ball screw is supported by the frame top plate so as to be rotatable around an axis extending in the front-rear direction. The drive source is capable of rotating the at least one ball screw around the shaft. At least one ball nut is mounted on the drum housing, and engages with the at least one ball screw so that the drum housing moves in the front-rear direction by the rotation of the at least one ball screw by the driving source. A plurality of linear guides extend in the front-rear direction and the at least one ball screw is arranged at intervals in the left-right direction on the frame top plate, and supports the drum housing movably in the front-rear direction. The bottom frame has a plurality of vertical plates and a plurality of horizontal plates. The plurality of vertical plates extend in the vertical direction and the front-rear direction, and are arranged in a row in the left-right direction, and support the above-mentioned frame top plate, respectively. A plurality of vertical plates including: at least one first vertical plate arranged so as to overlap the at least one ball screw from the vertical direction, and a plurality of vertical plates arranged to overlap the plurality of linear guides from the vertical direction 2nd longitudinal board. The plurality of horizontal plates are respectively connected to the plurality of vertical plates in the left and right directions.

Hereinafter, one embodiment of the tire testing machine 1 of the present invention will be described in detail with reference to the drawings. 1 and 2 are a plan view and a side view showing a tire testing machine 1 according to this embodiment. 3 is a perspective view showing part of the tire testing machine 1 according to this embodiment. In addition, in the following drawings, although the advancing and retreating direction of the rotating drum 4 of the drum advancing and retreating device 400 constituting a part of the tire testing machine 1 is taken as the front and rear directions, and each direction of up and down and left and right is shown, these directions are not It is used to define the structure or use mode of the drum advancing and retreating device and tire testing machine related to the present invention.

The tire testing machine 1 is equipped with: a main body frame 1S, a main shaft 2, a tire transfer mechanism 3, a drum advancing and retreating device 400 (Fig. 4 ) including a rotating drum 4 and a pair of upper and lower load sensors 4L (load detectors), and a lifting unit 50 (lifting mechanism) and marking unit 60. The tire testing machine 1 rotates the tire T around the tire rotation center axis in a horizontal posture in which the rotation center axis of the tire T ( FIG. 2 ) extends in the vertical direction at a predetermined tire test position P, and tests the tire T Carry out scheduled trials. In this embodiment, the tire testing machine 1 performs a predetermined test on tires T for trucks and buses.

The main body frame 1S is disposed substantially in the center of the tire testing machine 1, and a tire testing position P is formed inside it. Also, the main body frame 1S supports the main shaft 2 so as to be rotatable. The main body frame 1S has a bottom frame 100 , an intermediate frame 101 , and an upper frame 102 ( FIGS. 2 and 3 ).

The spindle 2 rotates around a reference rotation center axis 2S that is supported at the tire test position P so that the tire T can extend vertically. The spindle 2 has a lower spindle 21 and an upper spindle 22 ( FIGS. 2 and 3 ).

The tire transfer mechanism 3 (FIG. 2) is arranged along the horizontal transfer direction D1 in plan to pass through the tire test position P. In addition to carrying the tire T in a horizontal posture into the tire test position P, it can also transfer the tire T from the tire test position P to the tire test position P. The test position P is carried out along the conveyance direction D1.

The rotating drum 4 is rotatably supported by the drum advancing and retreating device 400 ( FIG. 4 ). The rotating drums 4 are disposed facing each other at the tire test position P (spindle 2 ) at a predetermined interval in a direction (left-right direction) substantially perpendicular to the conveyance direction D1 of the tire T conveyed by the tire conveyance mechanism 3 . This rotary drum 4 has a drum shaft 4S extending in a direction parallel to the reference rotation center axis 2S of the main shaft 2 (vertical direction) and a drum peripheral surface, and is a cylindrical member freely rotatable around the drum shaft. , a simulated road surface 4A on which the tire T travels is formed on the peripheral surface of the above-mentioned wheel. The simulated road surface 4A is in contact with the outer peripheral surface of the tire T, and the rotating drum 4 is driven by the tire T to rotate.

In addition, the present embodiment corresponds to the tire T for trucks and buses, and the diameter (diameter) of the rotating drum 4 is set in the range from 1520 mm to 1710 mm (reference value 1600 mm), and the rotating drum 4 is a drum having at least 1500 mm. A large diameter and heavy rotating body.

The drum advancing and retreating device 400 pushes the rotating drum 4 in the horizontal direction so as to approach (advance) and disengage (reverse) relative to the tire T. In addition, other structures of the drum advancing and retreating device 400 related to this embodiment will be described in detail later.

A pair of upper and lower load sensors 4L (load detectors) are respectively arranged on the vertical extension line (only the upper side is shown in FIG. 1 ) of the rotation central axis (drum shaft 4S) of the rotating drum 4 to detect and measure the rotating drum. 4 is subjected to the load from the tire T. The load sensor 4L is used to support the rotating drum 4 on the drum advancing and retreating device 400, and is equipped with one on the upper and lower parts of the rotating drum 4, and measures the force acting on the vertical direction of the axis of the rotating drum 4. load. In addition, in this embodiment, the load sensor 4L is a 2-axis load sensor, and the above-mentioned tire load is controlled (the advance and retreat position of the rotating drum 4 is controlled so that the pressing load of the rotating drum 4 relative to the tire T becomes a predetermined value). range), and measure RFV (radial force variation: the magnitude of the tire radial force variation) and LFV (lateral force variation: the magnitude of the tire axial force variation). That is, the tire testing machine 1 according to this embodiment uses a combination of a ball screw and a motor described later to bring the rotating drum 4 close to the main shaft 2, and make the tire T contact the simulated road surface 4A of the rotating drum 4 with the load sensor The 4L measures the load variation when the tire rotates and constitutes a tire uniformity testing machine for evaluating the uniformity of the tire T.

The tire conveyance mechanism 3 has a structure of a belt conveyor. The tire conveyance mechanism 3 has a carry-in conveyor 7 , a carry-in conveyor 8 , a carry-out conveyor 9 , a carry-in rack 7S, and a carry-out rack 9S. FIG. 1 shows that the tire T is conveyed from the right side (upstream side) to the left side (downstream side).

The carry-in conveyor 7 conveys the tire T to the tire test position P. As shown in FIG. The tire T carried by the carry-in conveyor 7 is transferred to the upstream portion of the conveyance conveyor 8 . The conveyance conveyor 8 receives the tire T from the carry-in conveyor 7 and carries the tire T into the tire test position P. As shown in FIG. The conveyance belt 8 stops the tire T at the tire test position P temporarily. Subsequently, when a predetermined test is applied to the tire T, the conveyance conveyor 8 further conveys the tire T downstream. The tire T conveyed by the conveyance conveyor 8 is transferred to the carry-out conveyor 9 . The delivery conveyor 9 receives the tire T from the conveyance conveyor 8, and further conveys the tire T downstream.

Furthermore, the carry-in conveyor 7 , the conveyance conveyor 8 , and the carry-out conveyor 9 are rotationally driven by a drive unit (not shown) included in the tire conveyance mechanism 3 . In addition, the conveying conveyor belt 8 can be raised and lowered by an unillustrated air cylinder included in the above-mentioned drive unit. The tire T carried into the tire test position P is transferred to the lower main shaft 21 by the descent of the conveyance belt 8 . FIG. 3 shows a state in which the conveyance conveyor belt 8 has moved to the lowermost lower position. When the conveyance conveyor 8 moves toward the uppermost upper position, the conveyance conveyor 8 is arranged at the same height as the carry-in conveyor 7 and the carry-out conveyor 9, and the tire T can be conveyed.

The carry-in conveyor 7 is rotatably supported by the carry-in frame 7S, and the carry-out conveyor 9 is rotatably supported by the carry-out frame 9S. In addition, the carry-out stand 9S supports a marking unit 60 ( FIG. 2 ) for marking the tire T according to the test result of the tire test position P. As shown in FIG.

The lift unit 50 ( FIG. 3 ) supports the upper spindle 22 liftably and rotatably. More specifically, the elevating unit 50 moves the upper main shaft 22 up and down relative to the lower main shaft 21 so that the tire T can be arranged between the lower main shaft 21 and the upper main shaft 22 . The elevating unit 50 can move up and down along a pair of left and right guide frames 102A ( FIG. 3 ) of the upper frame 102 in FIGS. 2 and 3 .

The lower main shaft 21 is capable of holding the lower flange 61 of the flange portion below the lower flange portion of the tire T in the above-mentioned horizontal posture from below, and supports the tire T from below through the lower flange 61 . The tire T is allowed to rotate around the reference rotation center axis 2S.

The upper main shaft 22 is an upper flange 62 that can hold and install the upper flange portion of the tire T in the above-mentioned horizontal posture from above on the upper flange portion, and supports the tire T from above through the upper flange 62 so that The tire T is rotatable around the reference rotation center axis 2S.

Furthermore, when the tire T is arranged at the tire test position P, the tire rotation center axis of the tire T is made to coincide with the reference rotation center axis 2S of the spindle 2 . The tire testing machine 1 has a plurality of lower rims 61 and upper rims 62 corresponding to the size (outer diameter, inner diameter, width), shape, etc. of the tire T to be tested at the tire test position P, corresponding to each tire T. Appropriate lower rims 61 and upper rims 62 are arranged at the tire test position P. As shown in FIG.

Next, the drum advancing and retreating device 400 related to this embodiment will be further described in detail. 4 and 5 are perspective views showing the drum advancing and retreating device 400 of the tire testing machine 1 according to the present embodiment from the front and the rear, respectively. FIG. 6 is an exploded perspective view of the drum advancing and retreating device 400 in a state where the rotating drum 4 and the drum housing 40 described later are removed from the drum advancing and retreating device 400 shown in FIG. 4 . 7 shows a perspective view of the chassis 100 of the drum advancing and retreating device 400 in a state where the lower main shaft 21 and the drum advancing and retreating drive unit 150 are removed from the drum advancing and retreating device 400 shown in FIG. 6 . FIG. 8 is a cross-sectional perspective view of a section indicated by arrow VIII of the chassis 100 shown in FIG. 7 . FIG. 9 is a perspective view of a plurality of vertical plates 115 constituting the chassis 100 .

The drum advancing and retreating device 400 is installed in the tire testing machine 1 and constitutes a part of the tire testing machine 1 . Furthermore, as shown in FIG. 3 , the drum advancing and retreating device 400 supports the conveying belt 8 of the tire conveying mechanism 3 and rotatably supports the main shaft 2 including the lower main shaft 21 and the upper main shaft 22 .

The drum advancing and retreating device 400 has: the base frame 100 , the above-mentioned rotating drum 4 , the drum housing 40 , the above-mentioned load sensor 4L, the main shaft rotation driving part 105 and the drum advancing and retreating driving part 150 .

The drum housing 40 can rotatably support the rotating drum 4 around the above-mentioned drum shaft 4S.

The chassis 100 has a chassis top plate 112 arranged horizontally below the drum housing 40 . The base frame 100 is installed on the ground of the test site where the tire testing machine 1 is installed, and supports the wheel housing 40 movable in the front and rear directions so that the simulated road surface 4A (the outer surface of the wheel) of the rotating wheel 4 is relative to the outer periphery of the tire T. face to face.

The spindle rotation drive unit 105 is provided at the front end of the base frame 100 , and drives the lower spindle 21 of the spindle 2 to rotate around the reference rotation center axis 2S. The main shaft rotation driving unit 105 is composed of a motor, a gear box, a driving pulley, a driving belt, and a driven pulley, and transmits the rotational force of the motor to the lower main shaft 21 .

The drum advance and retreat driving unit 150 advances and retreats the drum housing 40 supporting the rotating drum 4 in the front-rear direction. The drum advance and retreat driving part 150 has: a motor M (drive source), a coupling 151, a pair of reducers 152, a pair of ball screws 153, a pair of ball screw support parts 154, a pair of ball nuts 155, a pair of linear Guide pieces (also called guide rails) 161 and four housing support parts (also called sliders) 162 .

The motor M can rotate the pair of ball screws 153 around shafts extending in the front-rear direction. The motor M can rotate in forward and reverse directions respectively. The motor M is fixed to the rear end of the bottom frame top plate 112 of the bottom frame 100 through a bracket. The coupling 151 is provided with a reduction gear 152 that transmits the output of the motor M to an orthogonal type, and a pair of reduction gears 152 are connected to the coupling 151 . The coupling 151 and the pair of speed reducers 152 transmit the rotational driving force of the motor M in synchronization with the pair of ball screws 153 . As a result, the pair of ball screws 153 are synchronously rotated in forward and reverse directions around the respective axes.

The pair of ball screw support portions 154 are arranged at intervals in the left-right direction on the front end portion of the chassis top plate 112 . At this time, the pair of ball screws 153 are arranged to face each other with a gap in the left-right direction. Each ball screw support portion 154 rotatably supports the front end of the ball screw 153 with an internal bearing, and fixes the position of the front end of the front end. Furthermore, the rear end portion of the ball screw 153 is inserted into the driven shaft portion of the above-mentioned speed reducer 152 to be connected and supported by the speed reducer 152 . At this time, the driven shaft portion of the output portion of the speed reducer 152 is a position where the rear end portion of the ball screw 153 is fixed in the rotational direction but not fixed in the front-rear direction. As a result, each ball screw 153 is supported by the chassis top plate 112 so as to be rotatable around an axis extending in the front-rear direction. In addition, it prevents the bearing and the reducer 152 from receiving unreasonable force from the ball screw 153 .

A pair of ball nuts 155 shown in FIG. 6 are respectively attached and fixed to a drum housing 40 described later. The pair of ball nuts 155 is engaged with each of the ball screws 153 so that the drum housing 40 moves in the front-back direction when the pair of ball screws 153 is rotated by one of the motors M. As shown in FIG.

A pair of linear guides 161 is attached to the chassis top plate 112 so as to extend in the front-rear direction and to be spaced apart from the pair of ball screws 153 in the left-right direction, and supports the drum case 40 so as to be movable in the front-rear direction. . In the present embodiment, the pair of linear guides 161 are arranged on the left and right outer sides of the pair of ball screws 153 . Each linear guide 161 is linearly arranged from the front end of the chassis top plate 112 to the rear end. In addition, the four housing support parts 162 are respectively fixed to the linear guide mounting part 414 ( FIG. 12 ) described later of the drum housing 40 , and are engaged with each linear guide along the pair of linear guides 161 so as to be movable back and forth. Item 161.

The base frame 100 has: a main shaft support plate 111 , a base frame top plate 112 , four vertical plates 115 and a plurality of horizontal plates 116 .

The spindle support plate 111 is a horizontal plate that partitions the front upper portion of the chassis 100 . As shown in FIG. 7 , a circular main bearing hole 111A penetrating through the spindle support plate 111 in the vertical direction is formed in the central portion of the spindle support plate 111 . 6 shows that the lower spindle 21 of the spindle 2 is inserted into the main bearing hole 111A from above, whereby the spindle support plate 111 (base frame 100 ) rotatably supports the lower spindle 21 (spindle 2 ). In addition, the upper spindle 22 of the spindle 2 is arranged above the lower spindle 21 through the tire T, and the lower spindle 21, the tire T, and the upper spindle 22 are integrally rotated around the reference rotation center axis 2S during the test. The base frame 100 has a spindle support plate 111 to support the spindle 2. Therefore, when the rotating drum 4 abuts against the tire T to apply a load, the high rigidity of the base frame 100 can suppress the inclination of the lower spindle 21 relative to the reference rotation center axis 2S.

The chassis top plate 112 is a horizontal plate that partitions the rear upper portion of the chassis 100 . As shown in FIG. 6 , the above-mentioned main shaft support plate 111 is disposed at a position lower than the chassis top plate 112 . Moreover, as shown in FIG. 7 , the chassis top plate 112 has a pair of linear guide mounting portions 112A, a pair of front side support portions 112B, and a pair of rear side support portions 112C. The pair of linear guide mounting portions 112A is a portion to which the aforementioned pair of linear guides 161 is fixed. Also, the pair of front side support portions 112B are portions to which the pair of ball screw support portions 154 are fixed. Moreover, a pair of rear side support part 112C is a part which fixes the bracket of the reduction gear 152 of FIG.5, FIG.6.

Next, in the base frame 100 shown in FIG. 7 , the structure for supporting the main shaft support plate 111 and the base frame top plate 112 will be further described in detail. As shown in FIGS. 8 and 9 , the underframe 100 has a structure with high rigidity especially in the traveling direction of the drum and in the vertical direction by four vertical plates 115 and a plurality of horizontal plates 116 .

The four vertical plates 115 are arranged so that they extend in the vertical direction and the front-rear direction respectively and are arranged in the left-right direction, and support the main shaft support plate 111 and the chassis top plate 112 respectively.

Among the four vertical plates 115 described above, the left and right inner two vertical plates 115 are respectively defined as first vertical plates. The two first vertical plates are arranged so as to overlap the above-mentioned pair of ball screws 153 ( FIG. 6 ) when viewed from the vertical direction. That is, when each ball screw 153 is projected downward, it overlaps each first vertical plate. In other words, each first vertical plate is arranged vertically below the ball screw 153 so as to be parallel to the ball screw 153 . In addition, each first vertical plate is disposed so as to overlap with both the ball screw support portion 154 and the speed reducer 152 shown in FIG. 6 , as seen from the vertical direction. As a result, the first vertical plates are positioned vertically below the straight line connecting the left-right central portion of one front support portion 112B and the left-right central portion of one rear support portion 112C shown in FIG. 7 .

Similarly, among the above-mentioned four vertical plates 115, the left and right outer two vertical plates 115 are respectively defined as second vertical plates, and the two second vertical plates are arranged so as to be aligned with the above-mentioned pair of linear guides when viewed from the up and down direction. The pieces 161 (FIG. 6) overlap. That is, when each linear guide 161 is projected downward, it overlaps with each 2nd vertical board. In other words, each second vertical plate is arranged vertically below the linear guide 161 in parallel with the linear guide 161 . Furthermore, each second vertical plate is also positioned vertically below the linear guide mounting portion 112A shown in FIG. 7 .

In addition, the plurality of horizontal plates 116 are respectively connected to the above-mentioned plurality of vertical plates 115 in the left-right direction. Furthermore, as shown in FIG. 7 , an opening 116B is formed in a front side horizontal plate 116A of the frontmost horizontal plate 116 . A drive belt of the spindle rotation drive unit 105 ( FIG. 4 ) is inserted through the opening 116B.

When the structure of the four vertical plates 115 is further described in detail, each vertical plate 115 has a vertical plate main body 115A, an upper plate 115B (upper support plate), and a lower plate 115C (lower installation plate) ( FIG. 9 ).

The vertical plate main body 115A includes an upper end portion 115A1 and a lower end portion 115A2, and is a plate-shaped portion extending in the vertical direction and the front-rear direction ( FIG. 8 , FIG. 9 ).

The upper plate 115B is connected to the upper end portion 115A1 so as to extend from the upper end portion 115A1 of the vertical plate main body 115A in the left and right directions, and supports the chassis top plate 112 . In the present embodiment, the upper plate 115B is arranged only on the rear side portion of the vertical plate main body 115A ( FIG. 9 ).

The lower plate 115C is connected to the lower end portion 115A2 so as to extend from the lower end portion 115A2 of the vertical plate main body 115A in the left and right directions, and is installed on the floor of the test site. In addition, other members may be interposed between the floor and the lower plate 115C.

In addition, the upper end portion 115A1 of the vertical plate main body 115A of each vertical plate 115 described above has a rear upper end portion 115F ( FIG. 8 ) and a front upper end portion 115D ( FIG. 9 ). The rear upper end portion 115F is connected to the above-mentioned upper plate 115B. Furthermore, the front upper end portion 115D is arranged in front of the rear upper end portion 115F at a position lower than the rear upper end portion 115F, and supports the main shaft support plate 111 .

In this embodiment, the above-mentioned four vertical plates 115 are made of well-known H-shaped steel. That is, as shown in FIG. 9 , four H-shaped steels are arranged adjacent to each other in an I-shaped posture along the vertical direction. On the upper surface of the rear side of the four H-shaped steels, a top plate placement surface 115S on which the chassis top plate 112 can be placed is formed. On the other hand, each of the front upper end portions of the four H-shaped steels is notched to form a support plate placement surface 115T on which the main shaft support plate 111 can be placed. As mentioned above, four H-shaped steels with a large second moment constitute the skeleton part of the chassis 100 , thereby reducing the number of welds in the chassis 100 , and realizing a cheap and high-rigidity chassis 100 .

In addition, among the four vertical plates 115 , the inner two vertical plates 115 (first vertical plates) are formed with rectangular openings 115E ( FIG. 8 , FIG. 9 ). As a result, the second moment of the two outer vertical plates 115 is set larger than the second moment of the two inner vertical plates 115 (second vertical plates). As mentioned above, maintaining the high rigidity of the left and right outer vertical plates 115, since the left and right inner vertical plates 115 can be provided with a thinner thickness or openings or notches, the welding workability of the chassis 100 can be improved. In particular, since openings 115E are formed in the two inner vertical plates 115 , access to the inside is easy, and joining by welding of the four vertical plates 115 and the plurality of horizontal plates 116 can be easily performed. Furthermore, in the present embodiment, the opening 115E is not formed in the vertical plate 115 below the linear guide 161 , but the opening 115E is formed in the vertical plate 115 below the ball screw 153 . Since the linear guide 161 has the function of supporting the drum housing 40, the opening 115E is not formed in the vertical plate 115 directly below it, and not only the vibration caused by bending due to the bending moment but also the vibration in the vertical direction can be suppressed. On the other hand, since the ball screw 153 does not have the function of directly supporting the drum housing 40 , vibration in the vertical direction as described above is less likely to occur. Therefore, the opening 115E can be formed in the vertical plate 115 directly below it. On the other hand, in other embodiments, when the openings 115E are formed in the left and right outer vertical plates 115, the accessibility from the outside is improved, and the welding work inside the chassis 100 can be easily performed.

In addition, the drum advance and retreat device 400 has four intermediate frame support parts 113 (support legs). The four intermediate frame support parts 113 are respectively connected to the four corners of the bottom frame 100 so as to surround the bottom frame 100 . Each intermediate frame supporting part 113 has respectively: the lower end portion that is arranged on the ground; The upper end portion that supports the intermediate frame 101 and the upper frame 102 to support the lifting unit 50 (lifting mechanism); department. A plurality of intermediate frame support parts 113 bear the self-weight of the lifting unit 50, the intermediate frame 101 and the upper frame 102, and are connected to the bottom frame 100, thereby improving the setting stability of the bottom frame 100 and further reducing the device's dependence on the measured value. The effect of vibration.

10 is a perspective view of the drum housing 40 of the drum advancing and retreating device 400 according to the present embodiment. 11 and 12 are exploded perspective views of the drum housing 40 .

The drum housing 40 has a lower housing 41 and an upper housing 42 . The lower case 41 is shown as a U-shaped structure from the front, and the upper case 42 is connected to the upper end of the lower case 41 . As a result, a wheel housing space 40S is formed between the lower case 41 and the upper case 42 . The wheel housing space 40S is a space capable of housing the rotating wheel 4 so that the simulated road surface 4A of the rotating wheel 4 is exposed in front of the wheel housing 40 .

The lower case 41 has a bottom 411 (bottom wall), a pair of left and right side parts 412 (side walls), a pair of left and right ball screw blocks 413 (nut holding parts), four linear guide mounting parts 414 (held by support portion); and a plurality of side reinforcing plates 415 on the left and right sides.

The configuration is such that the bottom portion 411 extends horizontally toward the lower side of the rotating drum 4 to rotatably support the rotating drum 4 . The bottom 411 has: a bottom plate 411A, a plurality of bottom horizontal plates 411B, and a plurality of bottom vertical plates 411C. The bottom plate 411A is a plate material that becomes the bottom portion of the bottom portion 411 . A circular hub bearing hole 41S is formed in the center of the bottom plate 411A ( FIG. 11 ). The hub bearing hole 41S receives the lower end of the hub shaft 4S of the rotating hub 4 . A plurality of bottom horizontal plates 411B and a plurality of bottom vertical plates 411C are connected to the lower surface of the bottom plate 411A in a lattice shape, so as to enhance the rigidity of the bottom 411 .

A pair of left and right side portions 412 are erected from both left and right end portions of the bottom portion 411 . Each side portion 412 has: a side bottom plate 412A, a side upper plate 412B, a plurality of front and rear side horizontal plates 412C, and a side cover 412D. The side bottom plate 412A is a plate material that becomes the bottom portion of the side portion 412 and is connected to the end of the bottom plate 411A. The side upper plate 412B is connected to the upper end of the side bottom plate 412A, and partitions the upper end of the side portion 412 . A plurality of side horizontal plates 412C are fixed to the side bottom plate 412A, and connect the end of the bottom plate 411A and the side upper plate 412B up and down. The side cover 412D is fixed to each plate to close the space formed by the side bottom plate 412A, the bottom plate 411A, the side upper plate 412B, and the plurality of side horizontal plates 412C shown in FIG. 12 from the outside. As a result, the side portion 412 has a box-shaped structure, and the high rigidity of the wheel housing 40 is maintained.

A pair of left and right ball screw bearing blocks 413 are respectively disposed inside the frontmost bottom horizontal plate 411B among the plurality of bottom horizontal plates 411B. Each ball screw block 413 has a box shape, and is formed with a ball screw insertion hole 413A for receiving the ball screw 153 . In addition, the ball nut 155 described above is fixed to the ball screw block 413 ( FIG. 6 ). That is, the ball screw block 413 holds the ball nut 155 so that the wheel housing 40 can move relative to the bottom frame 100 in the front and rear directions. Furthermore, in the present embodiment, each ball screw block 413 is arranged in front of the hub shaft 4S of the hub housing 40 . Moreover, as shown in FIG. 10 , a hole for receiving the ball screw 153 is also formed in the frontmost bottom horizontal plate 411B. As mentioned above, disposing the ball nut 155 on the bottom 411 can shorten the vertical distance (relative height) between the ball screw 153 and the rotary drum 4 . Therefore, when the rotating hub 4 abuts against the tire T, the bending moment generated can be reduced, and the deformation of the hub housing 40 can be suppressed.

The four linear guide installation parts 414 are respectively disposed at the four corners of the bottom 411, front, rear, left, and right, and respectively fix the above-mentioned housing support part 162 (FIG. 6). As a result, the drum housing 40 is supported by the pair of left and right linear guides 161 through the four housing support portions 162 so as to be movable in the front-rear direction.

A plurality of left and right side reinforcing plates 415 are fixed to the left and right ends of the bottom 411 in a front-rear arrangement to enhance the rigidity of the bottom 411 and the pair of left and right side parts 412 .

The upper housing 42 is arranged horizontally above the rotating drum 4 and supports the rotating drum 4 rotatably. The upper housing 42 has: an upper housing bottom plate 420 , a pair of front and rear upper housing horizontal plates 421 , and a plurality of left and right upper housing vertical plates 422 . The upper housing 42 also has a lattice structure as above, which can increase the rigidity of the drum housing 40 . A circular hub bearing hole 42S is formed in the center of the upper housing bottom plate 420 . The drum bearing hole 42S receives the upper end portion of the drum shaft 4S of the rotating drum 4 . In addition, the aforementioned pair of left and right side portions 412 connect the bottom portion 411 and the upper case 42 to each other in the vertical direction.

As described above, each part of the lower housing 41 constituting the drum housing 40 has a small box-shaped structure, and the assembly thereof can enhance the rigidity of the drum housing 40 of the can-making structure. Therefore, to reduce the weight of the drum housing 40 , the natural vibration frequency of the drum housing 40 can be relatively high. And, as shown in FIG. 11 , although the upper part of the upper case 42 is open and does not have a box-shaped structure, the height of the upper case 42 can be maintained by a plurality of upper case horizontal plates 421 and a plurality of upper case vertical plates 422. rigidity. As a result, the weight of the drum housing 40 can be reduced compared to the case where a member is provided to close the upper surface of the upper housing 42 .

Then, when the rotating drum 4 is pressed toward the tire T, the rotating drum 4 is twisted and vibrates around the horizontal axis as indicated by the arrows around the dotted line in FIG. 10 . However, in the present embodiment, a plurality of side reinforcing plates 415 ( FIG. 12 ) or inclined covers 416 ( FIG. 10 ) are provided around the junction of the pair of left and right side portions 412 and the bottom 411 , and each side portion 412 has a box. type structure. Therefore, twisting of the rotating drum 4 and the drum housing 40 supporting it as described above can be suppressed.

In addition, the above-mentioned pair of upper and lower load sensors 4L are respectively installed in the hub bearing hole 41S of the lower housing 41 and the hub bearing hole 42S of the upper housing 42 . That is, the upper load sensor 4L (upper side load sensor) among the upper and lower pair of load sensors 4L is installed on the upper casing 42 (upper wall) of the drum casing 40 to detect The load on the above-mentioned hub shaft 4S. Also, the lower load sensor 4L (lower side load sensor) among the upper and lower pair of load sensors 4L is installed in the drum bearing hole 41S of the bottom 411 of the lower housing 41, and detects the The load on the above-mentioned hub shaft 4S. In particular, in this embodiment, a pair of ball nuts 155 are arranged on the left and right outer sides of the lower load cell 4L, and these members are arranged at substantially the same height in the vertical direction. Therefore, the load sensor 4L is less susceptible to tipping of the drum housing 40 .

Also, as described above, the left and right ball nuts 155 and the pair of ball screw blocks 413 holding them are disposed at the front end portion of the bottom portion 411 of the drum housing 40 . Therefore, the distance between the ball screw support portion 154 supporting the ball screw 153 and the ball nut 155 is shortened ( FIG. 6 ), and the rigidity of the wire can be improved. In addition, the transmission path of the load transmitted in the order of the tire T, the rotating drum 4, the drum housing 40, the ball nut 155, the ball screw 153, and the ball screw support portion 154 is shortened, and the load of the drum housing 40 can be suppressed. Topple or twist. Further, the load from the tire T on the rotating drum 4 (drum housing 40 ) is hardly applied to the speed reducer 152 supporting the rear end portion of the ball screw 153 .

As described above, in this embodiment, the chassis 100 that supports the drum housing 40 so that the rotating drum 4 can move forward and backward relative to the tire T has: the first vertical plate corresponding to the ball screw 153 and arranged directly below it; The linear guide 161 is arranged on the second vertical plate directly below it. Therefore, even if the load from the tire T is applied to the ball screw 153 and the linear guide 161 from the wheel housing 40 to the rotating drum 4, each vertical plate can still This load is stably received in the vertical direction. Therefore, in order to conduct a test with a tire T having a larger size than that of a general passenger car, even when the rotating drum 4 having a large weight continuing to a predetermined specification is supported on the drum housing 40, the test can be performed. The high rigidity and natural vibration frequency of the base frame 100 are maintained, so the vibration of the drum advancing and retreating device 400 can be suppressed, and the influence of its vibration on the measured value of the load sensor 4L can be reduced. In particular, each vertical plate suppresses deformation in the front-back direction and the up-down direction of the drum case 40 , and makes the drum case 40 less likely to vibrate. Also, as in the present embodiment, when the height of the center of gravity of the drum housing 40 including the rotating drum 4 and the driving support point of the ball screw 153 and the guiding position of the linear guide 161 are shifted up and down, the drum can be viewed from the side. When the housing 40 is closed, the drum housing 40 becomes easy to swing in the front and rear directions. At this time, the wheel housing 40 has a large bending moment acting on the bottom frame 100 , which deforms the bottom frame 100 and tends to swing. In the above case, the base frame 100 according to this embodiment has the beam structure with a strong bending moment as described above, and the influence of vibration on the measured value of the load cell 4L can be reduced as described above.

In addition, according to the above structure, the size of the drum advancing and retreating device 400 can be reduced by the structure of the chassis 100 including the first vertical plate and the second vertical plate, and its weight and cost can also be reduced. As a result, transportation and installation to the test site become easy. In particular, when a ship is used for transporting the drum advancing and retreating device 400 and the tire testing machine 1 equipped with it, commercially available containers can be used, and transport costs and transport time can be reduced.

Also, in this embodiment, the drum housing 40 including the rotating drum 4 can be moved forward and backward stably with respect to the tire T by a plurality of ball screws 153 and a plurality of ball nuts 155 . In addition, a plurality of first vertical plates are disposed directly below the plurality of ball screws 153, so that even when the rotating drum 4 receives a load from the tire T and is applied to the plurality of ball screws 153 from the drum housing 40, each vertical plate The plate is still stable against this load in the up-down direction.

In addition, in this embodiment, the position of the ball screw 153 in the height direction can be arranged close to the center of gravity of the drum housing 40 including the rotating drum 4, and the ball screw bearing block of the drum housing 40 can be sufficiently ensured. 413 Rigidity. Therefore, the vibration of the drum housing 40 can be suppressed, and the bottom frame 100 can stably receive the vibration in the vertical direction.

Also, as in the present embodiment, when the drum housing 40 is moved back and forth by two (plural) ball screws 153, the two ball screw blocks 413 can be arranged in the left and right direction in relation to the drum shaft 4S and the load sense. Different positions of detector 4L. On the other hand, when one ball screw 153 is used to move the drum case 40 back and forth, one ball screw block 413 is disposed below the load cell 4L so that the rotating drum can be included. 4, the offset of the center of gravity position of the drum housing 40 becomes larger. In this case, it becomes relatively difficult to maintain a high natural frequency of the chassis 100 compared to the case where two (plural) ball screws 153 are provided.

In addition, in the present embodiment, the pair of linear guides 161 stably supports the left and right outer parts of the drum housing 40 , so that the movement of the drum housing 40 can be guided more stably. Also, since the linear guide 161 and the ball screw 153 are all arranged to overlap the vertical plate 115, the natural frequency can be relatively increased compared to the case where they are arranged not to overlap the vertical plate 115. In addition, since the pair of linear guides 161 are provided on both inner sides of the pair of ball screws 153, they are provided on the left and right pair of side portions 412 (side walls) relatively closer to the drum housing 40, so that the rotating drum can be rotated. The decrease in the natural frequency of vibration due to the deformation of the wheel housing 40 when the load from the tire T is applied is relatively increased.

In addition, in this embodiment, among the four vertical plates 115 including two first vertical plates and two second vertical plates, the second moment of the two vertical plates on the left and right outer sides is set to be larger than that of the two vertical plates on the left and right inner sides. The second moment of is large. According to the above structure, the high rigidity of the left and right outer vertical plates can be maintained, so the thickness of the left and right inner vertical plates can be reduced to reduce the weight and cost of the chassis 100, or openings can be provided in the left and right inner vertical plates or The notches can improve the welding workability of the chassis 100 .

Furthermore, the second moments of the inner two vertical plates 115 (second vertical plates) among the four vertical plates 115 are set larger than the second moments of the outer two vertical plates (first vertical plates). According to the above structure, the pair of linear guides 161 which are relatively easily affected by vibration and the base frame 100 which maintains high rigidity through the two second vertical plates arranged below the overlapping position can mainly receive Bending moment from the drum housing 40 . Therefore, the rigidity of the two first vertical plates arranged so as to overlap the two ball screws 153 which are relatively easily affected by vibration can be relatively reduced.

Moreover, in this embodiment, each vertical plate 115 has: a vertical plate main body 115A, an upper plate 115B, and a lower plate 115C, so that the stability of each vertical plate 115 can be improved. Therefore, even when a load from the tire T is applied to the rotating drum 4 from the drum housing 40 to the ball screw 153 and the linear guide 161 , each vertical plate can further stably receive the load in the vertical direction.

In addition, the present embodiment utilizes high-rigidity general-purpose H-shaped steel, so that the rigidity of the chassis 100 including the plurality of vertical plates 115 can be improved at low cost compared with the case of using dedicated steel materials. In addition, as in the present embodiment, by arranging the above-mentioned H-shaped steel in an I-shape, the second moment of the beam constituting the chassis 100 can be increased, the deformation with respect to the bending moment can be suppressed, and the vibration of the drum housing 40 can be stably suppressed. . In addition, it is easy to arrange other components on the upper part of the I-shaped structure, and the installation on the ground can be improved through the lower part.

In addition, in this embodiment, the main shaft 2 can be rotatably supported through the main shaft support plate 111 through the plurality of vertical plates 115 of the underframe 100, so the underframe 100 can stably receive the tire T and the rotating drum 4 when they push each other. load. Therefore, the vibration of the drum advancing and retreating device 400 is reduced, and the toppling of the main shaft 2 can be suppressed.

In addition, in this embodiment, the bottom 411 of the drum housing 40 has two ball screw blocks 413, so the rotating drum 4 and the ball screw 153 are arranged close to each other in the vertical direction, and the toppling of the rotating drum 4 can be suppressed. , to reverse.

In addition, in the present embodiment, the two ball screw blocks 413 are arranged in front of the drum shaft 4S of the rotary drum 4 . In addition, the drum advancing and retreating device 400 further includes a pair of bottom frame top plates 112 respectively installed on the bottom frame 100, supporting the front end of the ball screw 153 and capable of receiving the load applied to the ball screw 153 from the drum housing 40. The support portion 154 . According to the above configuration, the distance between the ball screw support portion 154 and the ball nut 155 in the front and rear direction is small, thereby shortening the transmission path of the load, suppressing the toppling and torsion of the drum housing 40 and suppressing vibration.

In addition, in this embodiment, in order to test the large-sized tire T for trucks or buses, even if the predetermined specification is continued, the rotating drum 4 with a diameter of 1500 mm or more is supported on the drum housing 40. The high rigidity and natural vibration frequency of the underframe 100 can be maintained, thereby suppressing the vibration of the wheel advancing and retreating device 400 caused by the rotation of the rotating wheel 4 or the rotating wheel 4 being subjected to the load from the tire T, and reducing the sense of load caused by its vibration 4L influence on the measured value.

Moreover, in this embodiment, a plurality of intermediate frame support parts 113 bear the dead weight of the lifting unit 50 (intermediate frame 101, upper frame 102), and are connected to the bottom frame 100, which can improve the installation stability of the bottom frame 100 and further reduce the Influence of vibration of the device on the measured value.

As mentioned above, the drum advancing and retreating device 400 and the tire testing machine 1 equipped with it according to one embodiment of the present invention have been described, but the present invention is not limited to these forms, and the following modified embodiments are also possible.

(1) In the above-mentioned embodiment, as shown in FIG. 6 , although a pair of ball screws 153 and a pair of linear guides 161 have been arranged on the bottom frame top plate 112 of the bottom frame 100, the description has been made. limited to this. One ball screw 153 may be disposed between the pair of linear guides 161, preferably at the center thereof. At this time, only one ball nut 155 installed on the drum housing 40 and engaged with the ball screw 153 is required. In addition, one vertical plate 115 among the plurality of vertical plates 115 may be disposed vertically below the ball screw 153 (reducer 152 and ball screw 153 ).

In addition, in FIG. 6 , a pair of linear guides 161 may be arranged on the inner side in the left-right direction, and a pair of ball screws 153 may be arranged on both left and right outer sides of the pair of linear guides 161 . At this time, since the pair of ball screws 153 are arranged on the left and right outer sides than the pair of linear guides 161 , the operator can easily perform maintenance of the ball screws 153 and the ball nut 155 . In addition, since the linear guide 161 and the ball screw 153 are arranged so that all of them overlap the vertical plate 115 , the natural frequency can be relatively increased compared to the case where they are not overlapped with the vertical plate 115 . In addition, at this time, it is only necessary to arrange the four vertical plates 115 vertically below each linear guide 161 and each ball screw 153 . Also, three or more ball screws 153 and three or more linear guides 161 may be arranged on the chassis top plate 112, and vertical plates 115 may be arranged vertically below each ball screw 153 and each linear guide 161. In other words, a plurality of ball screws 153 and a plurality of linear guides 161 can be respectively arranged on the bottom frame top plate 112 . At this time, the vertical plate 115 vertically below the ball screw 153 constitutes the first vertical plate of the present invention, and the vertical plate 115 vertically below the linear guide 161 constitutes the second vertical plate of the present invention.

(2) Also, in the above-mentioned embodiment, the state in which the left and right ball nuts 155 and the pair of ball screw blocks 413 holding them are arranged at the front end portion of the bottom portion 411 of the drum housing 40 has been described. The present invention is not limited thereto, and may be arranged at the front and rear central parts or rear end parts of the bottom 411 . Furthermore, when these members are disposed at the rear end of the bottom portion 411 , the support of the ball screw 153 may be entrusted to the speed reducer 152 , and the ball screw support portion 154 may be disposed directly in front of the speed reducer 152 .

According to the present invention, there is provided a drum advancing and retreating device included in a tire testing machine in which the rotation center axis of the tire is extended in the vertical direction in a tire testing position and the tire is in a horizontal position at the above-mentioned rotation center. Rotate around the axle and carry out the predetermined test on the above tire. The drum advancing and retreating device includes: a cylindrical rotating drum, a drum housing, a chassis, a load detector, at least one ball screw, a driving source, at least one ball nut, and a plurality of linear guides. The rotating drum has a drum shaft extending in the vertical direction and a drum peripheral surface abutting against the peripheral surface of the tire. The drum housing rotatably supports the rotating drum around the shaft of the drum. The bottom frame is configured with a frame top plate below the above-mentioned drum housing. The chassis supports the wheel housing movable in the front-rear direction so that the wheel peripheral surface of the rotating wheel comes into contact with and separates from the wheel peripheral surface of the tire. The load detector can detect the load from the tire on the rotating drum. At least one ball screw is supported by the frame top plate so as to be rotatable around an axis extending in the front-rear direction. The drive source is capable of rotating the at least one ball screw around the shaft. At least one ball nut is mounted on the drum housing, and engages with the at least one ball screw so that the drum housing moves in the front-rear direction by the rotation of the at least one ball screw by the driving source. A plurality of linear guides extend in the front-rear direction and the at least one ball screw is arranged at intervals in the left-right direction on the frame top plate, and supports the drum housing movably in the front-rear direction. The bottom frame has a plurality of vertical plates and a plurality of horizontal plates. The plurality of vertical plates extend in the vertical direction and the front-rear direction, and are arranged in a row in the left-right direction, and support the above-mentioned frame top plate, respectively. A plurality of vertical plates including: at least one first vertical plate arranged so as to overlap the at least one ball screw from the vertical direction, and a plurality of vertical plates arranged to overlap the plurality of linear guides from the vertical direction 2nd longitudinal board. The plurality of horizontal plates are respectively connected to the plurality of vertical plates in the left and right directions.

According to this configuration, the chassis that supports the drum housing so that the rotating drum can advance and retreat relative to the tire has: the first vertical plate corresponding to the ball screw and arranged directly below it; and the linear guide corresponding to and arranged directly below it Even if the load from the tire is applied to the ball screw and linear guide from the wheel housing, each vertical plate can stably receive the load in the vertical direction. Therefore, in order to test a tire having a size larger than that of an ordinary passenger car tire, even in the case where a rotating drum having a large weight continuing to a predetermined specification is supported on the drum housing, the chassis can still be maintained. Due to the high rigidity and natural vibration frequency, the vibration of the wheel advance and retreat device can be suppressed by the rotation of the rotating wheel and the load from the wheel to reduce the impact of its vibration on the measured value of the load detector.

In the above configuration, the at least one ball screw includes a plurality of ball screws that are arranged at intervals in the left and right directions and is rotatably supported on the frame top plate, and the at least one ball nut includes a plurality of ball screws that are respectively connected to the plurality of ball screws. The plurality of ball nuts to be engaged, and the at least one first vertical plate of the plurality of vertical plates may include a plurality of first vertical plates respectively arranged to overlap the plurality of ball screws when viewed from the vertical direction.

According to this configuration, the drum housing including the rotating drum can stably advance and retreat relative to the tire by the plurality of ball screws and the plurality of ball nuts. In addition, a plurality of first vertical plates are disposed directly under the plurality of ball screws, so that even if the rotating drum receives a load from the tire and is applied to the plurality of ball wheel rods from the drum housing, each vertical plate can still move along. This load is stably received vertically.

In the above configuration, the plurality of ball screws are composed of two ball screws arranged opposite to each other in the left and right directions, and the plurality of linear guides are composed of two linear guides arranged on the left and right outer sides of the two ball screws. The above-mentioned plurality of first vertical plates are composed of two first vertical plates that are respectively arranged to overlap with the above-mentioned two ball screws in the vertical direction, and the above-mentioned plurality of second vertical plates are respectively arranged in the vertical direction. Consists of two second vertical plates overlapping the above two linear guides.

According to this configuration, the pair of linear guides can stably support the left and right outer parts of the drum case, so that the movement of the drum case can be guided more stably. In addition, since all the linear guides and the ball screws are arranged so as to overlap the vertical plates, the natural frequency can be relatively increased compared to the case where the vertical plates are not overlapped.

On the other hand, in the above configuration, the plurality of linear guides are composed of two linear guides arranged opposite to each other in the left-right direction, and the plurality of ball screws are formed by placing on the left and right outer sides of the two linear guides. The above-mentioned plurality of first vertical plates are composed of two first vertical plates that are respectively arranged to overlap the above-mentioned two ball screws in the vertical direction, and the above-mentioned plurality of second vertical plates are composed of upper and lower The direction indicator is arranged so as to be composed of two second vertical plates overlapping the above two linear guides.

According to this configuration, the pair of ball screws is arranged on the left and right outer sides than the pair of linear guides, and the operator can easily perform maintenance on the ball screws and ball nuts. In addition, since all the linear guides and the ball screws are arranged so as to overlap the vertical plates, the natural frequency can be relatively increased compared to the case where the vertical plates are not overlapped.

In the above-mentioned structure, among the four vertical plates including the two first vertical plates and the two second vertical plates, the second moments of the left and right outer two vertical plates are set to be larger than the left and right inner two vertical plates. It is better to have a large second moment.

According to this configuration, the rigidity of the left and right outer vertical plates can be maintained high, so the thickness of the left and right inner vertical plates can be reduced to reduce the weight of the chassis, or openings or notches can be provided in the left and right inner vertical plates to lift the chassis. welding workability.

In the above structure, it is preferable that the second moments of the two second vertical plates are set larger than the second moments of the two first vertical plates.

According to this structure, it is possible to receive the transmission from the wheel case mainly by the two linear guides that are relatively easily affected by vibration and the two second vertical plates arranged below the overlapped position that maintain a high rigidity. the bending moment. Therefore, the rigidity of the two first vertical plates arranged so as to overlap with the two ball screws that are relatively less susceptible to vibration can be relatively reduced.

In the above configuration, the plurality of vertical plates respectively include: a vertical plate main body, including an upper end portion and a lower end portion, and extending in the up-down direction and the front-rear direction; and a lower installation plate extending from the lower end of the vertical plate main body to the lower end respectively in the left and right direction, and is installed on the ground.

According to this configuration, the plurality of vertical plates have an I-shaped cross-sectional structure to improve their stability. Therefore, even if the rotating drum receives a load from the tire from the drum housing to the ball screw and linear guide, each vertical plate can still move along. This load can be received more stably in the vertical direction.

In the above structure, it is preferable that each of the plurality of vertical plates is formed of H-shaped steel.

According to this configuration, the H-shaped steel having high rigidity and general use is used for each vertical plate, and the rigidity of the chassis including a plurality of vertical plates can be improved inexpensively and reliably compared with the case of using a dedicated steel material.

In the above configuration, the chassis further includes a main shaft support plate configured to support a main shaft, the main shaft rotatably supports the tire at the tire test position, and the upper end of the vertical plate main body of the plurality of vertical plates is Preferably, each has: a rear upper end connected to the upper support plate, and a front upper end that is disposed in front of the rear upper end at a position lower than the rear upper end and supports the main shaft support plate.

According to this configuration, the main shaft can be rotatably supported by the plurality of vertical plates of the chassis and the main shaft support plate, so the load when the tire and the rotating drum are pressed against each other can be stably received by the chassis. Therefore, the vibration of the drum advancing and retreating device is reduced, and the toppling of the main shaft can be suppressed.

In the above-mentioned configuration, the above-mentioned drum housing has: an upper wall arranged above the above-mentioned rotating drum and rotatably supporting the above-mentioned rotating drum; a bottom wall arranged below the above-mentioned rotating drum and rotatably and a pair of left and right side walls, which are respectively arranged on the left and right sides of the above-mentioned rotating drum, and the above-mentioned upper wall and the above-mentioned bottom wall are connected to each other. Preferably, the at least one nut holding portion of the at least one ball nut can move the wheel housing relative to the bottom frame in a front-rear direction.

According to this configuration, since the bottom wall of the drum case has at least one nut holding portion, the rotating drum and the ball screw are arranged close to each other in the vertical direction, and the falling and twisting of the rotating drum can be suppressed.

In the above-mentioned configuration, at least one ball screw support which is installed on the frame top plate of the above-mentioned base frame and supports the front end portion of the at least one ball screw capable of receiving the load applied to the at least one ball screw from the drum housing is further provided. It is preferable that the at least one nut holding portion is arranged in front of the hub shaft.

According to this configuration, the distance between the ball screw support part and the ball nut in the front-rear direction can be reduced, so that the transmission path of the load from the rotating drum to the ball screw support part is shortened, and the fall and twist of the drum housing can be further suppressed. .

In the above configuration, the rotating drum is used for testing tires for trucks and buses at the tire testing position, and the diameter of the rotating drum is preferably set to be 1500 mm or more.

According to this configuration, in order to test large-sized tires for trucks or buses, the height of the chassis can be maintained even when a rotating drum with a diameter of 1500 mm or more is supported on the drum housing according to predetermined specifications. The rigidity and natural frequency of vibration, therefore, the vibration of the wheel advance and retreat device can be suppressed by the rotation of the rotating wheel and the load from the wheel by the rotating wheel, and the influence of its vibration on the measured value of the load detector can be reduced.

A tire testing machine according to another aspect of the present invention includes: a main shaft capable of rotating the tire around the rotation center axis at the tire test position so that the tire's rotation center axis extends in the vertical direction to a horizontal posture; and a conveying device. , the above-mentioned tire can be carried into the above-mentioned tire test position, and can be carried out from the above-mentioned tire test position; and any one of the drum advancing and retreating devices described above can make the above-mentioned rotating drum contact with the outer periphery of the above-mentioned tire arranged at the above-mentioned tire testing position. Leave.

According to this configuration, there is provided a tire testing machine capable of reducing the influence of vibration of the device on measured values when testing tires larger than ordinary passenger car tires.

In the above-mentioned configuration, the above-mentioned main shaft has: an upper main shaft supporting the above-mentioned tire in the above-mentioned horizontal posture from above; The above-mentioned tires can be arranged between the above-mentioned lower main shaft, so that the above-mentioned upper main shaft can be raised and lowered relative to the above-mentioned lower main shaft. The base frame preferably has: a lower end disposed on the ground; an upper end supporting the elevating mechanism; and a frame connecting portion connected to the base frame.

According to this configuration, a plurality of supporting legs bear the weight of the lifting mechanism and are connected to the base frame, thereby improving the installation stability of the base frame and further reducing the influence of the device on the vibration of the measured value.

According to this configuration, there are provided a wheel advancing and retreating device and a tire testing machine equipped therewith, which can reduce the influence of the vibration of the device on the measured value when testing a tire larger than a normal passenger car tire.

1: Tire testing machine 1S: Main frame 2: Spindle 2S: Reference axis of rotation 3: Tire handling mechanism 4:Rotating the drum 4A: simulated road surface 4L: Load Sensor (Load Detector) 4S: hub shaft 7: Move into the conveyor belt 7S: Move into the stand 8: Handling conveyor belt 9: Move out the conveyor belt 9S: Move out the bracket 21: Lower spindle 22: Upper spindle 40: wheel housing 50: Lifting unit 60: mark unit 61: Lower rim 62: Upper rim 100: chassis 101: middle frame 102: Upper shelf 105: Spindle rotation drive unit 111:Spindle support plate 111A: Main bearing hole 112: Bottom frame top plate 112A: Linear guide installation part 112B: front support part 112C: rear side support 115: Longitudinal plate 116: horizontal board 150: Wheel advance and retreat drive unit 151:Coupling 152: Reducer 153: ball screw 154: Ball screw support part 155: ball nut 161: Linear guide (rail) 162: Housing support part (slider) 400: Drum advance and retreat device D1: Transport direction M: motor P: tire test position T: tire

[ Fig. 1 ] A plan view showing a tire testing machine according to an embodiment of the present invention. [ Fig. 2 ] A side view showing a tire testing machine according to an embodiment of the present invention. [ Fig. 3 ] A perspective view showing part of a tire testing machine according to an embodiment of the present invention. [ Fig. 4 ] A perspective view showing a drum advancing and retreating device of a tire testing machine according to an embodiment of the present invention. [ Fig. 5 ] A perspective view showing a drum advancing and retreating device according to an embodiment of the present invention. [ Fig. 6 ] An exploded perspective view showing a drum advancing and retreating device according to an embodiment of the present invention. [ Fig. 7 ] A perspective view showing a chassis of a drum advancing and retreating device according to an embodiment of the present invention. [ Fig. 8] Fig. 8 is a sectional perspective view showing a chassis of a drum advancing and retreating device according to an embodiment of the present invention. [ Fig. 9 ] A perspective view showing a plurality of vertical plates constituting the chassis of the drum advancing and retreating device according to an embodiment of the present invention. [ Fig. 10 ] A perspective view showing a drum case of a drum advancing and retreating device according to an embodiment of the present invention. [ Fig. 11 ] An exploded perspective view showing a drum housing of a drum advancing and retreating device according to an embodiment of the present invention. [ Fig. 12 ] An exploded perspective view showing a drum housing of a drum advancing and retreating device according to an embodiment of the present invention.

2: Spindle

21: Lower spindle

62: Upper rim

100: chassis

105: Spindle rotation drive unit

111:Spindle support plate

112: Bottom frame top plate

113: Intermediate frame support part

150: Wheel advance and retreat drive unit

151:Coupling

152: Reducer

153: ball screw

154: Ball screw support part

155: ball nut

161: Linear guide (rail)

162: Housing support part (slider)

M: motor

Claims (14)

A drum advancing and retreating device installed in a tire testing machine for performing a predetermined test on the tire with the tire rotated around the center axis of rotation in a horizontal posture in which the center axis of rotation of the tire extends in the vertical direction at a tire test position , the drum advancing and retreating device is provided with: a cylindrical rotating drum having a drum shaft extending up and down and a peripheral surface of the drum abutting against the peripheral surface of the above-mentioned tire; ground support around the shaft of the above-mentioned drum; the bottom frame is arranged below the above-mentioned drum housing and has a bottom frame top plate, which supports the above-mentioned drum housing that can move in the front and rear directions, so that the outer peripheral surface of the above-mentioned drum of the above-mentioned rotating drum is relatively The peripheral surface of the above-mentioned tire is separated; the load detector is capable of detecting that the above-mentioned rotating drum receives a load from the above-mentioned tire; at least one ball screw is supported on the above-mentioned underframe top plate in a manner that is rotatable around an axis extending in the front-rear direction; a driving source , can make the above-mentioned at least one ball screw rotate around the above-mentioned shaft; at least one ball nut is installed on the above-mentioned wheel shell, and the above-mentioned wheel shell is moved back and forth along with the rotation of the above-mentioned at least one ball screw by the above-mentioned driving source The at least one ball screw is engaged with the above-mentioned at least one ball screw in such a way as to move in the direction; and a plurality of linear guides are installed on the above-mentioned bottom in such a manner that the at least one ball screw is arranged at intervals in the left-right direction and extends in the front-rear direction. The top plate of the frame supports the above-mentioned drum casing so as to be movable in the front-rear direction, and the bottom frame has: a plurality of vertical plates respectively extending in the vertical direction and the front-back direction and arranged in a row in the left-right direction, respectively supporting the top plate of the bottom frame, It includes: at least one first vertical plate arranged so as to overlap the at least one ball screw from the vertical direction, and a plurality of second vertical plates respectively arranged to overlap the plurality of linear guides from the vertical direction, and a plurality of horizontal plates, respectively connected to the plurality of vertical plates in the left and right directions. The drum advancing and retreating device as described in claim 1, wherein the at least one ball screw, including a plurality of ball screws, are respectively rotatably supported on the bottom frame top plate in a manner of being spaced apart in the left and right directions, and the at least one ball screw nut , including a plurality of ball nuts respectively engaged with the plurality of ball screws, and the at least one first vertical plate of the plurality of vertical plates includes a plurality of vertical plates arranged to overlap with the plurality of ball screws respectively when viewed from the upper and lower directions. 1st longitudinal board. The cylinder advancing and retreating device according to claim 2, wherein the plurality of ball screws are composed of two ball screws arranged opposite to each other in the left and right directions, and the plurality of linear guides are arranged on the left and right sides of the two ball screws. The two outer linear guides are formed, and the above-mentioned plurality of first vertical plates are formed by two first vertical plates arranged to overlap with the above-mentioned two ball screws in the vertical direction. The plurality of second vertical plates are constituted by two second vertical plates arranged vertically so as to overlap the two linear guides. The drum advancing and retreating device as described in claim 2, wherein the plurality of linear guides are composed of two linear guides arranged opposite to each other in the left and right directions, and the plurality of ball screws are formed of two linear guides arranged on the above two linear guides. The two ball screws on the left and right outer sides of the above-mentioned plurality of first vertical plates are composed of two first vertical plates respectively arranged to overlap with the above-mentioned two ball screws in the vertical direction, and the above-mentioned plurality of second vertical plates The plate is composed of two second vertical plates arranged vertically so as to overlap the two linear guides. The drum advancing and retreating device as described in claim 3 or 4, wherein, among the four vertical plates including the above-mentioned two first vertical plates and the above-mentioned two second vertical plates, the second moments of the left and right outer two vertical plates are: Set larger than the second moment of the two vertical plates on the left and right inside. The drum advancing and retreating device according to claim 3 or 4, wherein the second moments of the two second vertical plates are set to be larger than the second moments of the two first vertical plates. The drum advancing and retreating device as described in any one of Claims 1 to 4, wherein the above-mentioned plurality of vertical plates respectively include: a vertical plate main body, including an upper end portion and a lower end portion, facing up and down and forward Extending in the rear direction; an upper support plate extending from the upper end of the vertical plate main body to the left and right directions and connected to the upper end, and supporting the bottom frame top plate; and a lower setting plate extending from the lower end of the vertical plate main body The parts are respectively extended in the left and right directions, are connected to the above-mentioned lower end part, and are installed on the ground. The drum advancing and retreating device as described in claim 6, wherein the above-mentioned plurality of vertical plates are respectively made of H-shaped steel. The drum advancing and retreating device according to claim 7, wherein the base frame further includes a main shaft support plate configured to support a main shaft, the main shaft rotatably supports the tire at the tire testing position, and the above-mentioned plurality of vertical plates The above-mentioned upper ends of the vertical plate main body respectively have: a rear-side upper end connected to the above-mentioned upper-side support plate, and a position lower than the rear-side upper end in front of the above-mentioned rear-side upper end, and supports the above-mentioned main shaft support plate. the front upper end of the . The drum advancing and retreating device according to any one of claims 1 to 4, wherein the drum housing has: an upper wall disposed above the rotating drum to rotatably support the rotating drum; a bottom The wall is arranged below the above-mentioned rotating drum and supports the above-mentioned rotating drum in a rotatable manner; and a pair of left and right side walls are respectively arranged on the left and right sides of the above-mentioned rotating drum. The above-mentioned upper wall and the above-mentioned bottom wall are connected to each other, and the above-mentioned bottom wall of the above-mentioned drum housing has at least one nut holding part respectively holding the above-mentioned at least one ball nut, so that the above-mentioned drum housing can be positioned relative to the above-mentioned bottom. The frame moves relative to the front and rear directions. The drum advancing and retreating device as described in Claim 10, further comprising at least one ball screw support part installed on the bottom frame top plate of the above bottom frame, and supporting the front end of the at least one ball screw to receive from the above wheel shell The load applied by the body to the at least one ball screw, and the at least one nut holding portion is arranged in front of the hub shaft. The drum advancing and retreating device as described in any one of Claims 1 to 4, wherein the above-mentioned rotating drum is used for testing tires for trucks and buses at the above-mentioned tire testing position, and the diameter of the above-mentioned rotating drum is set to be Above 1500mm. A tire testing machine comprising: a main shaft capable of rotating the above-mentioned tire in a horizontal position in which the center axis of rotation of the tire extends in the vertical direction at a tire test position around the center axis of rotation; and a tire transfer device capable of carrying the tire into the Tire test position, and carry out from above-mentioned tire test position; The outer peripheral surface of the above-mentioned tire arranged at the above-mentioned tire test position is contacted. The tire testing machine according to claim 13, wherein the main shaft has an upper main shaft for supporting the tire in the horizontal posture from above, and a lower main shaft for supporting the tire in the horizontal posture from below, and further includes an elevating mechanism. , in such a way that the tire can be arranged between the upper main shaft and the lower main shaft, that the upper main shaft can be raised and lowered relative to the lower main shaft, and the above-mentioned drum advancing and retreating device further has a plurality of supporting legs, and the plurality of The supporting legs are arranged around the bottom frame, and respectively have: a lower end disposed on the ground; an upper end supporting the lifting mechanism; and a frame connecting portion connected to the bottom frame.

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