JP3778547B2 - Cab door structure in construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a door structure of a cab in a construction machine that is disposed on, for example, a hydraulic excavator and is used by an operator to get on and off.
[0002]
[Prior art]
Generally, in construction machines such as this type of hydraulic excavator, there is one in which the operator's seat is provided with a cab so as to be separated from the front working part. A door for opening and closing the opening is provided. By the way, as a door attached to the cab, there is a door configured to open and close along the side surface of the cab so that a large opening can be secured even if there is no wide space around. As such a door, for example, there is a slide type configured such that rollers provided at a plurality of upper and lower positions on the door side roll (run) each of a plurality of upper and lower guide rails provided on the cab side. In this way, when the slide type is configured, the guide rail provided below the cab is provided below the opening through which the operator enters and exits, so mud that adheres to the operator's shoes when getting on and off the cab. And sand may fall on the guide rails and accumulate, or mud and sand splashed by the traveling operation of the lower traveling body may accumulate, and this will impair smooth opening and closing of the door There was a problem. Therefore, for example, as shown in Japanese Patent Application Laid-Open No. 11-336128, a guide rail having a rail surface facing in the horizontal direction is provided below the cab, and a scraper is provided on a bracket that supports the roller so that the roller travels. It has been proposed that the scraper is configured to wipe off the mud accumulated on the rail surface of the guide rail in the previous stage, thereby enabling the smooth opening and closing of the door to be maintained.
[0003]
[Problems to be solved by the invention]
By the way, in the said conventional thing, it is the structure which wipes off the mud collected on the rail surface with a scraper, and the mud is easy to collect on the rail surface. Moreover, since the door on which the scraper is provided and the cab on which the guide rail is provided are in a relative movement relative to each other, in order to perform a smooth relative movement, the upper and lower sides are interposed between the scraper and the guide rail. A gap in the direction is required. As a result, even if the mud and sand on the rail surface of the guide rail are wiped off in advance by the scraper, mud and sand corresponding to the gap between the scraper and the rail are on the rail surface. Since the roller travels over the remaining mud or sand, it has a problem that the door is still difficult to open and close, and the door opening and closing work becomes heavy. There is also a problem that the present invention is to solve.
In addition, in the above-described conventional one, the door side edge of the guide rail is in a flat plate state in order to facilitate the removal of mud and sand placed on the rail surface. May come off the guide rail. For this reason, in this case, an auxiliary roller having an axial core facing the vertical direction is provided on the bracket on the door side, and the auxiliary roller is fitted into a groove-shaped guide rail provided separately on the lower surface of the cab. There is also a problem that the door is prevented from coming off and the configuration becomes complicated, and there is also a problem to be solved by the present invention.
[0004]
[Means for Solving the Problems]
The present invention has been created in view of the above-described circumstances and has been created for the purpose of solving these problems. The invention of claim 1 provides a door on the side of the cab that opens and closes an opening formed in the cab. When the slide mechanism for sliding along the guide rail is configured using a guide rail provided at the lower part of the cab and a roller supported on the door side so as to travel on the guide rail, the guide rail is columnar and has an outer peripheral surface. A plurality of rollers rolls, and the rollers are at least a pair of sides that respectively roll an upper roller that rolls at least the upper guide surface of the guide rail and side guide surfaces on both sides that sandwich the upper guide surface. It is the door structure of the cab in the construction machine comprised including the partial roller .
By doing so, it is possible to prevent mud and sand from accumulating on the guide rail so that the smooth opening / closing operation of the door is not impaired.
The invention according to claim 2, Oite to claim 1, the guide rail includes a rail body in which the columnar, is constituted by a plate which projects downwardly from the lower end of the rail body, the plate, the cab It is the door structure of the cab in the construction machine supported by the bracket provided in the downward direction via the support member arrange | positioned with a predetermined gap. By doing in this way, mud and sand do not accumulate under the guide rail.
A third aspect of the present invention is the cab door structure in the construction machine according to the second aspect, wherein the support member is formed in a cylindrical shape. By doing in this way, mud and sand do not accumulate on a support member.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings of FIGS.
In the drawings, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 has an upper swing body 3 supported on a crawler-type lower traveling body 2 so as to be rotatable. A front attachment 8 including member devices such as a boom 5, an arm 6, and a bucket 7 is attached to a substantially central portion of the frame 4. Further, a cab 9 is provided on one side of the front attachment 8 to allow an operator to sit down and operate the hydraulic excavator, and a tank chamber 10 such as a fuel tank or a hydraulic oil tank is provided on the other side. The basic configuration is the same as in the past.
[0006]
The cab 9 includes a pair of left and right side portions 9a and 9b and a pair of front and rear side portions 9c and 9d so as to constitute an operation room equipped with a seat (not shown) on which an operator is seated, various levers, meters, and the like. , And an upper ceiling surface portion 9e and a lower floor surface portion (provided on the gantry frame 4) 9f, and a side surface portion on the side not adjacent to the front attachment 8 (in this embodiment) 2, an opening is formed in the front half of the left side surface portion 9a), and a door 11 is provided in the opening so as to be freely slidable in the front-rear direction.
Between the door 11 and the left side surface portion 9a of the cab 9, upper, middle, and lower slide mechanisms U, M, and L are interposed at three places, an upper portion, an intermediate portion in the vertical direction, and a lower portion, respectively. The door 11 is attached via the slide mechanisms U, M, and L. Of the slide mechanisms U, M, and L, the present invention is applied to the lower slide mechanism L provided in the lower portion. Yes. Here, each of the slide mechanisms U and M located at the upper part and the middle part is provided with a conventionally used mechanism, and although detailed description thereof is omitted here, the upper slide mechanism U is a door front edge part. And a rail 9g provided on the front half of the upper portion of the left side surface portion 9a (not shown). Moreover, the intermediate part slide mechanism M is comprised using the roller provided in the door rear edge part, and the rail 9h provided in the second half part of the left side surface part 9a.
[0007]
Now, the lower slide mechanism L has the following configuration.
That is, the base end portion of the plate-like support bracket 12 projecting downward is located along the door side edge at the lower facing portion of the opening which is the front half of the lower surface of the floor portion 9f constituting the cab 9. It is provided integrally. A through hole 12a is formed at a front end (lower end) of the support bracket 12 with a predetermined gap, and a base of a plurality of support bodies (support members of the present invention) 13 is provided in each through hole 12a. The end portions are each fixed through. Each of these support bodies 13 is formed in a cylindrical bar shape, and the tip portion is set so as to protrude toward the door 11 and to be located inside the door side edge of the floor surface portion 9f. Each support body 13 is located below the cab floor surface portion 9f, and is provided in the horizontal direction so that mud is easily dropped and collected. However, the support body 13 has a predetermined gap. In addition, it is formed in a columnar shape, so that mud is not easily accumulated on the upper surface (upper outer peripheral surface) of the support body 13, but rather slides down the circumferential outer peripheral surface.
[0008]
On the other hand, 14 is a guide rail provided on the cab 9 side, and the guide rail 14 is formed in a curved shape so as to be gently curved along the door side edge. Further, the id rail 14 is formed in a columnar shape, and is formed by a rail body 14a in which substantially the entire outer peripheral surface can serve as a guide surface, and a plate surface that is formed long along the rail length direction of the rail body 14a and faces the vertical direction. And a guide plate (corresponding to the plate of the present invention) 14b. One end (upper end) of the guide plate 14b is fitted into the lower half of the rail body 14a and the other end ( The lower end portion protrudes downward from the lower end of the rail body 14a. A plurality of through holes 14c are formed in the other end portion of the guide plate 14b, and the guide rail 14 is interposed through the support body 13 by fixing the distal end portion of the support body 13 through these through holes 14c. It is set to be fixed to the support bracket 12 on the cab 9 side.
In the fixed state of the guide rail 14, the guide rail 14 is positioned below the door side edge of the floor surface portion 9f, and the rail body 14a is formed in a columnar shape and faces the horizontal direction facing upward. It has a configuration with almost no surface. For this reason, even if mud has fallen on the guide rail 14, the circumferential outer peripheral surface of the rail body 14 a is slid down, thereby making it difficult for mud and sand to accumulate on the guide rail 14. Furthermore, since the support body 13 is also provided with a predetermined gap in the lower part of the guide rail 14 and is formed in a columnar shape as described above, the lower part of the guide rail 14 is also mud. And it is set so that sand does not collect.
[0009]
A roller bracket 15 is attached to the front end portion of the lower end portion of the door 11 so as to protrude toward the cab 9, and the roller bracket 15 includes a mounting piece 15 a that is a horizontal plane and front and rear edges of the mounting piece portion 15 a. It is comprised with a pair of reinforcement piece part 15b which faces below from a part. The tip of the mounting piece 15a protrudes in a positional relationship facing the lower side of the floor 9f above the guide rail 14 on the cab 9 side with the door 11 attached to the opening. First, second, and third traveling rollers 16, 17, and 18 for rolling (running) the guide surface on the outer peripheral surface of the guide rail 14 are provided in the section.
Each of the first, second, and third traveling rollers 16, 17, and 18 is a roller surface 16a that is an arcuate recess so as to roll on the cylindrical outer peripheral surface (guide surface) of the guide rail 14. , 17a, 18a and roller bodies 16b, 17b, 18b, and roller shafts 16c, 17c, 18c bearing the rotation center of each of the roller bodies 16b, 17b, 18b.
[0010]
An opening 15c is formed at the front end of the roller bracket mounting piece 15a so as to be located on the rear side in the front-rear direction (upper side in FIG. 5). The roller shaft 16c of the first traveling roller 16 is fixed to the lower side surfaces of the left and right side edges of the opening 15c using a fixing piece 19 and a bolt 19a for screwing the fixing piece 19 to the mounting piece 15a. ing. Thus, the first traveling roller 16 is disposed on the roller bracket 15 with the roller shaft 16c facing in the left-right direction and the upper portion of the roller body 16b exposed upward from the opening 15c. The first traveling roller 16 is set so that the roller surface 16 a becomes an upper roller that comes into contact with the guide rail 14 from the upper side and rolls on the upper outer peripheral surface that is the upper guide surface of the guide rail 14.
[0011]
Further, a pair of left and right shaft fixing members 20 are fixed to the lower side surface located on the front side of the front end of the mounting piece 15a, and these shaft fixing members 20 are secondly equivalent to the side rollers of the present invention. The roller shafts 17c, 18c of the third traveling rollers 17, 18 are fixed in a state in which they are directed in the vertical direction. The second and third traveling rollers 17 and 18 are in such a positional relationship that the roller surfaces 17a and 18a are in contact with the left and right outer peripheral surfaces of the guide rail 14 facing each other and roll on the portions. These rollers 17 and 18 are configured to sandwich the guide rail 14 from both the left and right directions. As a result, during the operation in which each traveling roller 16, 17, 18 rolls on the guide rail 14, the door 11 is prevented from shaking in the left-right direction, and each traveling roller 16, 17, 18 is guided by the guide rail 14. It is set so as to be prevented from coming off to prevent it from coming off.
[0012]
In the embodiment of the present invention configured as described, when the operator gets on and off the hydraulic excavator 1, the door 11 disposed on the left side surface portion 9a of the cab 9 is connected to the upper, middle, lower slide mechanism U, Open and close via M and L. In this case, the lower slide mechanism L includes the first, second, and third traveling rollers 16, 17 attached to the roller bracket 15 on the door 11 side with the guide rail 14 provided below the cab floor surface portion 9 f. In this configuration, the guide surface of the guide rail 14 is a cylindrical outer peripheral surface. For this reason, as described above, the guide rail 14 has almost no horizontal surface on which mud and sand easily collect, and even if mud or sand falls on the guide rail 14, they do not collect on the guide rail 14. The smooth running by the first, second and third running rollers 16, 17, 18 is not impaired.
[0013]
In addition, in order to support the guide rail 14 on the cab 9 side, the support body 13 arranged in the horizontal direction is a cylindrical body, and the support body 13 of such a cylindrical body has a predetermined gap. It is configured to be arranged. For this reason, a columnar support body 13 with a predetermined gap exists between the guide rail 14 and the cab 9 where mud and sand tend to accumulate in the horizontal direction. There is no accumulation of sand.
[0014]
Further, in this configuration, the guide rail 14 is configured such that the first, second, and third traveling rollers 16, 17, and 18 travel, and the second and third rollers 17 and 18 move the guide rail 14 to the left and right. Since both sides are rolled so as to be sandwiched from both sides, it is possible to prevent the door 11 from swinging and to prevent the travel rollers 16, 17 and 18 from coming off the guide rail 14. Thus, the slide mechanism L that is reliable and has good operability can be configured without providing a separate rail for preventing detachment unlike the conventional one.
[0015]
Needless to say, the present invention is not limited to the above embodiment, and the rail shape is not a columnar shape, but a triangular shape, a quadrangular shape, a pentagonal shape as in the other embodiments shown in FIG. It can be set as the guide rail G of polygonal shapes, such as a shape and a hexagonal shape. In this case, the plurality of traveling rollers R are respectively the tops of those shown in FIGS. 7 (A), (B), (D), (E), (F), (G), (H), and (K). The upper roller rolls on the top facing the side, and the upper roller rolls on the side facing the top as shown in FIG. 7 (C), (I), (L) or (M). As a result of not being configured, it is convenient that mud or sand does not collect on the upper guide surface as in the case of the guide rail having a cylindrical shape as in the first embodiment described above. Furthermore, in FIG. 7 (J), although there is a side portion facing the top side, the traveling roller does not roll on the side portion, and the pair of upper rollers roll on the left and right inclined side portions. Since this is a thing, this thing is convenient because mud and sand do not collect on the rolling surface.
[Brief description of the drawings]
FIG. 1 is an overall side view of a hydraulic excavator.
FIG. 2 is an overall plan view of a hydraulic excavator.
FIG. 3 is a side view of a cab part.
4 is a cross-sectional view taken along line XX in FIG.
FIG. 5 is a bottom view of the lower slide mechanism.
6 is a cross-sectional view taken along line XX in FIG.
7 (A), (B), (C), (D), (E), (F), (G), (H), (I), (J), (K), FIG. (L), (M) is a pattern figure which shows the other example of a guide rail and a roller, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 9 Cab 9a Side surface part 9f Floor surface part 11 Door 12 Support bracket 13 Support body 14 Guide rail 14a Rail main body 14b Guide plate 15 Roller bracket 16 First traveling roller 16a Roller surface 17 Second traveling roller L Lower part Slide mechanism

Claims (3)

A slide mechanism for sliding the door that opens and closes the opening formed in the cab along the side surface of the cab, a guide rail provided at the lower part of the cab, and a roller that is supported on the door side so as to travel on the guide rail In configuring the guide rail, the guide rail is columnar, and a plurality of rollers roll on the outer peripheral surface. The roller sandwiches the upper guide surface and at least an upper roller that rolls on the upper guide surface of the guide rail. A door structure for a cab in a construction machine comprising a pair of side rollers that roll on side guide surfaces on both sides . Oite to claim 1, the guide rail includes a rail body in which the columnar, is constituted by a plate which projects downwardly from the lower end of the rail body, the plate, given a bracket provided below the cab The door structure of the cab in the construction machine supported via the support member arrange | positioned with a clearance gap. The cab door structure according to claim 2, wherein the support member is formed in a columnar shape.

Images