JP5417010B2 - Lubrication pipe - Google Patents

Description

  The present invention relates to a structure of an oil supply pipe mounted on a construction machine or the like.

Conventionally, a construction machine such as a hydraulic excavator has been provided with an oil supply pipe for supplying oil to a hydraulic drive motor or the like. In such an oil supply pipe, a detachable cap is attached so that oil can be prevented from leaking out in normal times and can be supplied when necessary.
For example, Patent Document 1 discloses a closure structure using a plug body that can be elastically deformed for the purpose of improving the water-stopping property of a hollow portion such as a pipe material and improving workability during attachment and removal. ing.

However, the conventional oil supply pipe has the following problems.
That is, in the oil supply pipe disclosed in the above publication, the elastic deformation of a plug body (cap) such as a resin foam is used to improve the water-stopping performance of the pipe material, and the detachability of the plug body. When applied to an oil supply pipe or the like mounted on a construction machine or the like, the plug may fall off due to slippage or intense vibration caused by oil.

  An object of the present invention is to provide an oil supply pipe capable of preventing a cap from falling off with a simple configuration even in an environment in which vibration is easily applied (for example, when mounted on a construction machine or the like). .

An oil supply pipe according to a first aspect of the present invention is an oil supply pipe in which a cap having a convex portion on an outer peripheral surface is fitted into an opening end portion and sealed, and includes a cap, a cylindrical main body portion, a fitting portion, It has. The fitting portion is formed on the inner peripheral surface of the main body portion, and is fitted with a convex portion formed on the outer peripheral surface of the cap. A plurality of convex portions formed on the outer peripheral surface of the cap are provided in an annular shape along the circumferential direction and along the insertion direction of the cap, and are provided along a direction substantially perpendicular to the outer peripheral surface. 1 surface and the 2nd surface which inclines downward toward the front end side inserted in an opening edge part.
Here, in the structure of the oil supply pipe in which the opening end is sealed using a cap having an unevenness for preventing falling off on the outer peripheral surface, the inner peripheral surface of the cylindrical main body is fitted to the unevenness on the cap side. A fitting part is provided.

Here, as said fitting part, the convex part or recessed part caught on the recessed part or convex part by the side of a cap may be sufficient, and the annular groove | channel etc. which were formed in steps may be sufficient. Further, the fitting portion does not need to be completely locked so as not to be movable in the insertion direction, for example, in a fitting state between the convex portion and the concave portion, or the convex portion and the convex portion, and a predetermined play is generated. You may fit in a certain state.
As a result, compared to conventional oil supply pipes that have a flat inner peripheral surface, the cap does not easily fall off while maintaining the hermeticity even with oil supply pipes that allow oil to flow inside. be able to. As a result, it is possible to effectively prevent the cap from dropping off even under the condition that it is mounted on a construction machine such as a hydraulic excavator and is constantly subjected to large vibrations.

An oil supply pipe according to a second aspect of the present invention is the oil supply pipe according to the first aspect of the present invention, wherein the fitting portion is provided in the vicinity of the opening end in the main body.
Here, the fitting part which fits into the unevenness | corrugation of a cap and prevents the cap from falling off is provided in the vicinity of the opening end in the main body part of the oil supply pipe.
Thereby, the outer peripheral part of the cap inserted in the inner peripheral part of a main-body part can be hold | maintained in the opening edge part vicinity. Therefore, a drop-off preventing function can be easily obtained at the initial stage of cap insertion.

An oil supply pipe according to a third aspect of the present invention is the oil supply pipe according to the first or second aspect of the present invention, wherein the fitting portion is provided at a position recessed from the opening end portion of the main body portion by a predetermined distance.
Here, the fitting part which fits into the unevenness | corrugation of a cap and prevents a cap from falling is provided in the position of the back | inner side from the opening edge part in the main-body part of an oil supply pipe | tube.
Thereby, the outer peripheral part of the cap inserted in the inner peripheral part of a main-body part can be hold | maintained in the state inserted firmly to the back. Therefore, a drop-off prevention mechanism can be obtained with the cap firmly inserted.

An oil supply pipe according to a fourth aspect of the present invention is the oil supply pipe according to the first or third aspect of the present invention, wherein the inner diameter of the main body portion is closer to the inner diameter D1 on the opening end side than the fitting portion, and the portion of the fitting portion. Assuming that the inner diameter D2 is the inner diameter D3 on the back side of the fitting portion, the relationship of D2 <D3 <D1 is satisfied.
Here, a difference is provided in the inner diameter dimension on the front side and the back side of the fitting portion when viewed from the opening end portion. Specifically, the inner diameter dimension on the back side is made smaller than the inner diameter dimension on the near side.
As a result, it is possible to configure an oil supply pipe that is easy to mount and difficult to come off during installation.

An oil supply pipe according to a fifth aspect of the present invention is the oil supply pipe according to any one of the first to fourth aspects of the present invention, wherein the rear end portion of the fitting portion is formed in a curved shape or a tapered shape. ing.
Here, in consideration of the detachability after the cap is attached, the back side portion of the fitting portion to be fitted to the concave and convex portions of the cap is curved or tapered.

  Thereby, the removal of the cap after attachment and detachment can be facilitated, and workability when the oil supply pipe is supplied with oil can be improved.

  According to the oil supply pipe according to the present invention, it is possible to effectively prevent the cap from dropping off even under the condition that the oil supply pipe is mounted on a construction machine such as a hydraulic excavator and is always subjected to a large vibration.

The perspective view which shows the structure of the hydraulic shovel carrying the oil supply pipe | tube which concerns on one Embodiment of this invention. The front view which shows the structure of the periphery of the turning motor mounted in the hydraulic excavator of FIG. (A) is a front view which shows the cap with which the opening end part of the oil supply pipe connected to the turning motor of FIG. 2 is mounted | worn. (B) is sectional drawing which shows the structure of the opening edge part vicinity of the oil supply pipe | tube with which the cap is mounted | worn. (A) is sectional drawing which shows the state at the time of mounting | wearing with the said cap at the opening edge part of the said oil supply pipe | tube. (B) is an expanded sectional view which shows the structure around the protrusion part formed in the internal peripheral surface of the said oil supply pipe | tube. (A) is sectional drawing which shows the state with which the cap was mounted | worn with the oil supply pipe | tube which concerns on other embodiment of this invention. (B) is an expanded sectional view which shows the structure of the opening edge part vicinity of the oil supply pipe | tube. (A) is sectional drawing which shows the state with which the cap was mounted | worn with the oil supply pipe | tube which concerns on further another embodiment of this invention. (B) is an expanded sectional view which shows the structure of the opening edge part vicinity of the oil supply pipe | tube.

An oil supply pipe according to an embodiment of the present invention will be described below with reference to FIGS.
[Configuration of hydraulic excavator 1 as a whole]
As shown in FIG. 1, a hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, a swivel base 3, a work implement 4, a counterweight 5, a vehicle body portion 6, an equipment room 9, and a cab 10. And.

The lower traveling body 2 has the crawler belt P wound around the left and right ends in the traveling direction to rotate the hydraulic excavator 1 forward and backward, and the swivel base 3 is mounted on the upper surface side in a state where the swivel base 3 can be turned. Yes.
The swivel base 3 can be swung in any direction on the lower traveling body 2 by a swivel motor 20 to be described later. The work machine 4, the counterweight 5, the vehicle body portion 6, and the cab 10 are mounted on the upper surface. ing.

  The work machine 4 is configured to include a boom 11, an arm 12 attached to the tip of the boom 11, and a bucket 13 attached to the tip of the arm 12. The work machine 4 moves the boom 11, the arm 12, the bucket 13 and the like up and down by the hydraulic cylinders 11a, 12a and 13a included in a hydraulic circuit (not shown), and the earth and sand and gravel on the site of the civil engineering work. Excavation work.

The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and hardened. The counterweight 5 has a vehicle body portion 6 on the swivel base 3 to balance the vehicle body during mining. It is provided behind.
As shown in FIG. 1, the vehicle body 6 is disposed at a position adjacent to the counterweight 5 and has an upper opening for inspection covered by an openable engine hood 14. Inside the vehicle body section 6 are housed an engine, a cooling core (not shown), a turning motor 20 described later, and the like, which are power sources for driving the lower traveling body 2 and the work implement 4.

The equipment room 9 is disposed behind the work machine 4 and houses a fuel tank, a hydraulic oil tank, an operation valve, and the like (not shown).
The cab 10 has an indoor space in which an operator of the hydraulic excavator 1 gets on and off, and is disposed on the left front side which is the side of the work machine 4 on the swivel 3 so that the tip of the work machine 4 can be seen. ing.

(Swivel motor 20)
The turning motor 20 is mounted on the lower traveling body 2 inside the vehicle body 6 and turns the above-described turning base 3 in a desired direction. Further, as shown in FIG. 2, the turning motor 20 turns the turntable 3 on the lower traveling body 2 by rotating a pinion gear 23 via a speed reducer 21 and a turning shaft 22.
Here, the revolving motor 20 is connected to an oil supply pipe 40 having a cap 30 attached to the opening end. During maintenance or the like, oil is supplied to and exchanged with respect to the turning motor 20 through the oil supply pipe 40.

(Structure of oil supply pipe 40 and cap 30)
The oil supply pipe 40 of this embodiment is a cylindrical metal pipe, and a cap 30 shown in FIG. 3A is attached to the opening end portion to prevent oil leakage.

The cap 30 includes a head portion 31 and a trunk portion 32 as shown in FIG. The head portion 31 is a portion that is gripped when the cap 30 is removed, and is connected to the trunk portion 32 via a collar-shaped portion. The trunk | drum 32 has the cyclic | annular convex parts 33a and 33b at the front-end | tip part and the center part, respectively.
The convex portions 33 a and 33 b have inclined surfaces that are acute with respect to the insertion direction, and are formed so as to protrude from the outer peripheral surface of the body portion 32. When the cap 30 is attached to the opening end portion of the oil supply pipe 40, the convex portions 33a and 33b advance along the inner peripheral surface 41a of the main body portion 41 of the oil supply tube 40, and the convex portion 33b on the distal end side will be described later. It is locked when it gets over the protruding part (fitting part) 42 to be engaged.

As shown in FIG. 3B, the oil supply pipe 40 includes a cylindrical main body 41 and an annular protrusion 42 formed at a predetermined position on the inner peripheral surface 41a.
The projecting portion 42 is formed at a position recessed from the opening end portion of the oil supply pipe 40 by a predetermined distance in accordance with the convex portions 33 a and 33 b formed on the cap 30. Therefore, as shown to Fig.4 (a), when the cap 30 is inserted deeply, the cap 30 can be hold | maintained in the oil supply pipe 40 side by the convex part 33b of the cap 30 fitting. In addition, by providing the protrusion 42 at a position deeper from the opening end than in the vicinity of the opening end as described above, it is possible to recognize that the cap 30 has been fitted until the cap 30 is firmly inserted.

Here, as shown in FIG. 4B, the inner diameter of the main body portion 41 of the oil supply pipe 40 is provided with a difference before and after the protruding portion 42. Specifically, assuming that the inner diameter D1, the inner diameter D2 of the protruding portion 42, and the inner diameter D3 on the inner side of the projecting portion 42 in order from the opening end side of the oil supply pipe 40, the following relational expression (1) is satisfied. The inner diameter is set.
D2 <D3 <D1 (1)
Thereby, when the cap 30 is attached, the inner diameter on the opening end side is large, so that the cap 30 is easily inserted. Further, since the inner diameter of the rear side of the fitting projection 42 is smaller than the opening end side, the convex portion 33b of the attached cap 30 abuts against the portion of the inner diameter D3 while being elastically deformed. can do.

  Furthermore, the protrusion part 42 has the taper part 42a in the edge part of the back | inner side in the part protruded from the internal peripheral surface 41a. The taper portion 42a is an inclined surface formed so as to include a smooth R-shaped curved surface portion. By providing such a tapered portion 42a (inclined surface), it is possible to weaken the force required to release the fitted state when the cap 30 once inserted is removed.

Thereby, the detachability of the cap 30 at the time of performing the oil supply operation | work with respect to the oil supply pipe | tube 40 can be improved.
In the present embodiment, as described above, the oil supply pipe 40 is provided with the protruding portion 42 that protrudes radially inward from the inner peripheral surface 41a in order to fit the convex portions 33a and 33b on the cap 30 side.
As a result, even when the oil supply pipe 40 is used in an environment in which oil is supplied to the inside and is always subjected to severe vibrations and impacts like the hydraulic excavator 1, it is formed on the inner peripheral surface 41a of the oil supply pipe 40. The projected portion 42 and the convex portions 33a and 33b on the cap 30 side can be fitted. Therefore, it is possible to prevent the cap 30 from falling off the oil supply pipe 40 as compared with the conventional oil supply pipe structure. Further, by providing the protrusion 42 that fits with the protrusions 33a and 33b of the cap 30 on the oil supply pipe 40 side, when the cap 30 is mounted, the operator can prevent the protrusions 33a and 33b from being inserted in the process of inserting the cap 30. It is possible to recognize that the cap 30 is securely attached from the sense of getting over the protrusion 42. That is, the cap 30 can be pushed in until it is fully inserted using the feeling obtained when fitting with the protrusion 42 formed on the oil supply pipe 40 side.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.
(A)
In the said embodiment, the example which formed the protrusion part 42 as a fitting part in the position which only the predetermined distance deepened from the opening edge part in the internal peripheral surface 41a of the main-body part 41 of the oil supply pipe 40 demonstrated. However, the present invention is not limited to this.

For example, as shown in FIGS. 5A and 5B, a protrusion 142 as a fitting portion may be provided in the vicinity of the opening end portion of the inner peripheral surface 141 a of the main body portion 141 of the oil supply pipe 140. .
In this case, when the cap 30 is mounted, since the convex portions 33a and 33b on the cap 30 side come into contact with the protrusion 142 immediately after the start of insertion, the cap 30 can be easily prevented from falling off. it can.

(B)
In the said embodiment, the example which formed only one projection part 42 as a fitting part in the position which only the predetermined distance deepened from the opening edge part in the internal peripheral surface 41a of the main-body part 41 of the oil supply pipe 40 is demonstrated. did. However, the present invention is not limited to this.
For example, as shown in FIGS. 6 (a) and 6 (b), the fitting portion is provided in the vicinity of the opening end of the inner peripheral surface 241a of the main body 241 of the oil supply pipe 240 and a position recessed by a predetermined distance. The protrusions 242 and 243 may be provided.

  In this case, when the cap 30 is mounted, the convex portions 33a and 33b on the cap 30 side come into contact with the protrusions 242 and 243, so that a double drop-off preventing function can be obtained. .

(C)
In the above-described embodiment, the protruding portion 42 protruding from the inner peripheral surface 41a of the main body portion 41 of the oil supply pipe 40 is used as a fitting portion that is fitted to the convex portions 33a and 33b provided on the outer peripheral surface of the cap 30. An example was given and explained. However, the present invention is not limited to this.
For example, on the inner peripheral surface of the oil supply pipe 40, if a concave portion that fits into the convex portion on the cap side or a concave portion on the cap side is provided, a convex portion that fits into the concave portion is provided. Good.
That is, for the fitting between the outer peripheral surface of the cap and the inner peripheral surface of the oil supply pipe, various combinations such as a combination of a concave portion and a convex portion, a combination of a convex portion and a convex portion, a combination of a concave portion and a concave portion, etc. Combinations can be employed.

(D)
In the said embodiment, as shown to Fig.4 (a) etc., the projection part 42 of the oil supply pipe 40 is fitted in the recessed part between the convex parts 33a and 33b of the cap 30 with a predetermined play. Explained with an example. However, the present invention is not limited to this.
For example, the structure which fits in the state without the play which cannot move in the insertion direction between both convex parts of the cap side may be sufficient. In other words, the present invention may be a fitting structure in which the amount of play is irrelevant between the unevenness on the cap side and the fitting portion on the oil supply pipe side.

(E)
In the above embodiment, an example in which a rubber member is used as the cap 30 has been described. However, the present invention is not limited to this.
For example, a cap molded as an elastic foamed resin member may be used.

(F)
In the above embodiment, an example in which the present invention is applied to the oil supply pipe 40 connected to the swing motor 20 mounted on the hydraulic excavator 1 has been described. However, the present invention is not limited to this.
For example, the present invention may be applied to an oil supply pipe connected to various devices mounted on other construction machines such as a bulldozer and a wheel loader, or an oil supply mounted and connected to an apparatus other than the construction machine. You may apply this invention with respect to a pipe | tube.

  The oil supply pipe of the present invention is mounted on a construction machine such as a hydraulic excavator, and has the effect of effectively preventing the cap from falling off even under conditions in which large vibrations are always applied. The present invention can be widely applied to various types of oil supply pipes used in places where vibrations are easily applied.

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Swivel base 4 Working machine 5 Counterweight 6 Car body part 9 Equipment room 10 Cab 11 Boom 11a Hydraulic cylinder 12 Arm 12a Hydraulic cylinder 13 Bucket 13a Hydraulic cylinder 14 Engine hood 20 Turning motor 21 Reduction gear 22 Turning shaft 23 Pinion Gear 30 Cap 31 Head 32 Body 33a, 33b Protrusion 40 Oil supply pipe 41 Main body 41a Inner peripheral surface 42 Projection (fitting part)
42a Taper part 140 Oil supply pipe 141 Main body part 141a Inner peripheral surface 142 Projection part (fitting part)
240 Oil supply pipe 241 Main body 241a Inner peripheral surface 242 Protrusion (fitting part)
243 Protruding part (fitting part)
D1, D2, D3 Inner diameter

JP 2005-321080 A (published on November 17, 2005)

Claims (5)

A cap having a convex portion on the outer peripheral surface is an oil supply pipe that is fitted into the opening end and sealed.
The cap;
A cylindrical body,
Are formed on the inner peripheral surface of the main body portion, and a fitting portion to be fitted to the front Kitotsu portion formed on an outer peripheral surface of the cap,
Equipped with a,
A plurality of the convex portions formed on the outer peripheral surface of the cap are provided in an annular shape along the circumferential direction and along the insertion direction of the cap, and are provided along a direction substantially perpendicular to the outer peripheral surface. The first surface formed and the second surface inclined downward toward the tip end side inserted into the opening end.
Refueling pipe. The fitting portion is provided in the vicinity of the opening end portion in the main body portion.
The oil supply pipe according to claim 1. The fitting portion is provided at a position recessed from the opening end portion of the main body portion by a predetermined distance.
The oil supply pipe according to claim 1 or 2. As for the inner diameter of the main body, assuming that the inner diameter D1 is closer to the opening end than the fitting portion, the inner diameter D2 is a portion of the fitting portion, and the inner diameter D3 is a portion farther than the fitting portion, D2 <D3 <Satisfying the relationship of D1.
The oil supply pipe according to claim 1 or 3. The rear end of the fitting portion is formed in a curved surface shape or a tapered shape,
The oil supply pipe according to any one of claims 1 to 4.

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