JPH08247365A - Oil path-piping joint structure for vehicle - Google Patents

Abstract

PURPOSE: To provide an oil path-piping joint structure for vehicles, which is capable of easily holding the connection between oil path-pipings connected in an oil-tight state by an inexpensive structure. CONSTITUTION: In an oil path-piping joint structure for vehicles, with which an oil path-piping 10 on one side is fitted on and connected to an oil path-piping 12 on the other side, a slipping-off preventing metal fitting which can be freely loaded and unloaded when the oil path-pipings are fastened and unfastened, is provided on the oil path-piping 10 on one side, and an engagingly locking part 22 which is engaged with an engaging recessed part 18 or an engaging projected part formed on the outer peripheral surface of the oil path-piping 12 on the other side to restrict the movement of the oil path-piping 12 on the other side, is provided on the slipping-off preventing metal fitting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle oil passage pipe joint structure in which an oil passage pipe on one side and an oil passage pipe on the other side are fitted and connected to each other.

[0002]

2. Description of the Related Art Conventionally, in an oil passage pipe of a vehicle, one oil passage pipe is used for connection between oil passage pipes provided for an oil passage for supplying and discharging relatively low-pressure oil such as lubricating oil. This is done by using a joint structure in which the end portion is formed as a male screw and the other pipe end portion is formed as a female screw, and both pipes are screwed in to increase oil tightness, and at the same time, it is hard to come off.

[0003]

However, in the structure in which the oil passage pipes are screwed together as described above,
Since it is necessary to form a threaded portion on the end of the oil passage pipe, and the screwing operation is troublesome,
The manufacturing cost and assembly cost of oil passage piping were high. Therefore, for example, a structure is conceivable in which the oil passage pipes are simply connected in a state in which they are prevented from coming off with a configuration as shown in FIGS. 8 to 11. That is, as shown in FIGS. 8 and 9, the male oil passage pipe 53 whose outer periphery is sealed by the O-ring 52 is inserted into the female oil passage pipe 51, and the female oil passage pipe 51 is inserted.
A pair of elongated holes 54 formed along the outer periphery near the opening of the
54 and the concave groove 55 formed annularly on the outer circumference of the oil passage pipe 53 on the male side, the elongated holes 54, 5
A conceivable structure is one in which the elliptical ring fitting 56 is engaged with the groove 4 and the recessed groove 55 so as to be sandwiched therebetween. In this structure, due to the elasticity of the elliptical ring fitting 56, the elongated holes 54, 54 and the groove 5
5 is maintained, but the elliptical ring metal fitting 56 is lengthened by the contact of another object with the ring portions 56a, 56a extending to the outer ring so that the engagement can be manually released. There is a drawback that the oil passages are relatively easily removed from the holes 54, 54 and the concave groove 55, and the reliability of the connection between the oil passage pipes is low. In addition, the one shown in FIG. 10 (a), (b) or FIG. 11 has an end portion 62a in one oil passage pipe 61.
By bending a pair of leaf springs 62 fixed by welding or the like so as to spread outward from the vicinity of the fixed portion, and bending the outward expansion portion inward near the opening end 61a of the oil passage pipe 61, A long hole 63 that allows the other oil passage pipe to be inserted into a leaf spring 62 portion that faces the opening end 61a of the oil passage pipe 61 and faces the opening end 61a.
63 are respectively bored, the other oil passage pipes 64 are fitted into the one oil passage pipes 61 through the long holes 63, 63, and further, as shown in FIG. The leaf spring 62 is elastically biased so that the inner edges of the elongated holes 63, 63 are engaged with the annular recessed groove 65 formed on the outer peripheral surface of the oil passage pipe 61, or as shown in FIG. It is conceivable that the leaf spring 62 may be elastically biased so as to engage with the annular projection 66 formed on the outer circumference of the oil passage pipe 64 in a state of being prevented from coming off. When they contact each other, the position of the long hole 63 of the leaf spring 62 is likely to be a position where the engagement with the concave groove 65 or the ridge 66 of the oil passage pipe 64 is released, and therefore, the fitted oil passage pipe 61, There is a drawback that 64 can come off relatively easily. Sex is low.

The present invention has been made in view of the above circumstances, and the oil passages of a vehicle can be connected and held together in an oil-tight state in an oil-tight state with a reliable and simple prevention of disconnection with an inexpensive structure. The purpose is to provide a pipe joint structure.

[0005]

According to a first aspect of the present invention, there is provided a vehicle oil passage pipe joint structure according to the first structure, wherein the oil passage pipe on one side is detachable by fastening and releasing the fastening. The retaining metal is provided, and the locking portion that restricts the movement of the oil passage pipe on the other side by engaging with the recessed portion for engagement or the convex portion for engagement formed on the outer peripheral surface of the oil passage pipe on the other side prevents the slipping off. The characteristic feature is that it is provided on the metal fitting.

According to a second aspect of the present invention, there is provided an oil passage pipe joint structure for a vehicle according to the above-mentioned structure, wherein the engaging recesses or engaging portions formed on the outer peripheral surfaces of the oil passage pipes on the one side and the other side respectively. A locking portion that engages with the fitting convex portion in a state where the respective oil passage pipes are retained is provided in each of the split retaining metal fittings divided into two in a state where the radial direction of the both oil passage pipes is the perspective direction. In addition to being formed, the split retaining members can be fastened and fixed in the direction of distance from each other. The operation and effect of this characteristic configuration are as follows.

[0007]

In other words, according to the structure of claim 1, the oil passage pipe on one side is provided with the retaining metal fitting that can be detached by fastening and releasing the fastening, and the engagement is formed on the outer peripheral surface of the oil passage pipe on the other side. Since the retaining member is provided with a locking portion that engages with the concave portion or the convex portion for engagement and restricts the movement of the oil passage pipe on the other side,
Before fastening the retaining metal fitting to the oil passage pipe on one side, fit the oil passage pipe on the other side to the oil passage pipe on the one side, and then, the concave portion for engagement or the convex portion for engagement of the oil passage pipe on the other side. When the retaining metal fitting is fastened to the oil passage pipe on one side with the locking portion engaged with the oil passage pipe on the one side, the oil passage pipe on the one side and the oil passage pipe on the other side are engaged with each other in the pulling direction. The retaining part is firmly retained by the engagement of the retaining part with the retaining part. Then, in order to fit and connect both oil passage pipes in the retaining state, it is sufficient to simply form the retaining metal fitting, its fastener and a structure capable of being fastened, and the engaging concave portion or the engaging convex portion.

According to the second aspect of the present invention, the oil passage pipes are prevented from coming off in the engaging concave portions or engaging convex portions formed on the outer peripheral surfaces of the oil passage pipes on the one side and the other side, respectively. The locking parts that engage in this state are formed on each of the split retaining metal fittings that are divided into two in a state where the radial direction of both oil passage pipes is the perspective direction, and both split retaining metal fittings are in the perspective direction of each other. Since it is configured so that it can be fastened and fixed, the oil passage pipe on the other side is first fitted to the oil passage pipe on the one side, and then the split retaining metal member divided into two is fitted into the engaging recesses of both oil passage pipes. Or, in the state where the engaging portion is engaged with the engaging convex portion in the retaining state,
The two oil passage pipes are arranged so as to embrace the fitting portions, and then the two split retaining metal fittings are fastened and fixed with fasteners, whereby the both oil passage pipes are firmly prevented from coming off. In order to fit and connect both oil passage pipes in the retaining state, a pair of split retaining metal fittings in a two-divided state, a fastener and a structure capable of being fastened, and an engaging concave portion or an engaging convex portion are provided. All you have to do is form it.

[0009]

Therefore, according to the first and second aspects of the present invention, the oil-tight connection between the oil passage pipes is not the screw-type connection, but the engagement structure is simply formed on the other oil passage pipe. The metal fittings that can be engaged with can be simply attached to one oil passage pipe or to both oil passage pipes in a detachable manner, and it can be securely prevented from coming off without forming a screw part on the oil passage pipe. Since it is good, it is structurally simple, its fabrication is simple, and it can be constructed at low cost.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a riding lawn mower as an example of a vehicle. This riding lawn mower has a pair of left and right front wheels 1, 1
Also, the boarding operation unit 4 is provided at the front of the machine body 3 movably supported by the rear wheels 2 and 2, the driving unit 5 is provided at the rear part of the machine body 3, and the front mower 6 is provided at the lower front of the machine body. I am configuring.

An engine 7 and a radiator 8 located in front of the engine 7 are arranged in the prime mover 5, and in a drain oil passage of a hydrostatic continuously variable transmission (HST) (not shown). In order that the air-cooled oil cooler 9 provided in the radiator 8 can be used for cooling together with the radiator 8, the oil passage pipe 10 of the oil cooler 9 is arranged facing the cooling air passage to the radiator 8. The oil passage pipe 12 for supplying drain oil to the oil passage pipe 10 of the oil cooler 9, the oil passage pipe 12 for returning from the oil cooler 9 to the oil tank, and the oil passage pipes 10, 10 are as shown in FIG. Is connected to. The joint structure for making the connection will be described in detail below.

As shown in FIGS. 3 (a) and 3 (b), the oil passage pipes 10 and 10 made of metal tubes are end portions of a pair for supplying pressure oil to the oil cooler 9 and discharging pressure oil. Are bent in a rearward direction from the lateral side of the radiator 8 in a state of being positioned close to each other. Then, at the end thereof, the connecting member 1 made of a plate material extends over both oil passage pipes 10, 10.
3 is cross-linked. This connecting member 13 is an oil passage pipe 10,
10 are connected to each of 10 by welding or brazing, and a fastening member 14 described later can be fastened to the connecting member 13 with a bolt 15 in the middle of the oil passage pipes 10, 10 which are separated by a predetermined distance. Connect the nut portion 16 to the connecting member 13
It is provided in. On the other hand, the oil passage pipes 12 and 1 made of metal tubes to be inserted and fitted into the oil passage pipes 10 and 10 respectively.
The first annular groove 17 and the second annular groove 18 are formed as grooves over the entire circumference at the end of No. 2, and the first annular groove 17 near the end has an O-ring for oil-tight sealing. I am wearing 19. Then, the oil passage pipe 12 is inserted and fitted into the oil passage pipe 10, and the second annular recessed groove 18 forms the opening end 10 of the oil passage pipe 10.
Both of the oil passage pipes 12, 12
The sheet metal retaining member 14 having a bent piece 23 formed at its tip with semi-circular notches 22 and 22 as engaging portions that engage with the second annular recessed grooves 18 and 18, respectively.
The semicircular cutouts 22, 22 into the second annular groove 1
8 and 18 are engaged with each other and fastened to the fastening nut portion 16 with the bolt 15 to prevent the oil passage pipes 12, 12 from coming off from the oil passage pipes 10, 10 in an oil-tight state. .

Next, an embodiment of the second invention will be described.
A structure for connecting the oil passage pipe 12 to the oil passage pipe 10 of the oil cooler 9 will be described as in the first embodiment. As shown in FIGS. 4 (a) and 4 (b), the oil cooler 9 is formed with an annular groove 24, which forms a groove over the entire circumference, near the open ends 10a of the pair of oil passage pipes 10. In both cases, a first annular groove 25 and a second annular groove 26, which form a groove over the entire circumference, are formed near the open ends 12a of the pair of oil passage pipes 12 of the oil pump 11. An O-ring 27 for an oil-tight seal is attached to the first annular groove 25. Further, retaining fittings 28, 28 for preventing the oil passage pipe 12 from coming off in a state of being inserted and fitted into the oil passage pipe 10 are provided. This retaining metal fitting 28
Is a sheet metal material bent in a U-shape in a side view, and is a bent piece 29 on one end side of the retaining metal fitting 28.
The oil passage pipe 12 is inserted and fitted into the oil passage pipe 10,
When the annular groove 26 is located outside the open end 10a of the oil passage pipe 10, both oil passage pipes 12, 1
The semicircular cutout portions 30 and 30 are formed as engaging portions that engage with the second annular recessed grooves 26 and 26, respectively, and the oil passage pipe 10 is provided in the bent piece 31 on the other end side. ，
Semi-circular cutout portions 32, 32 are formed as engaging portions that engage with the annular recessed grooves 24, 24 of 10, respectively. Then, the oil passage pipe 10 and the oil passage pipe 1 are actually in a retaining state.
When retaining the connection part with 2,
Prepare two oil passages 8 and 28, and oil passage pipe 10 and oil passage pipe 12
At the connection position with the semi-circular cutout parts 30, 30, 32, 32, the second annular recessed groove 26,
26, the annular recessed grooves 24, 24 so that the second annular recessed grooves 26, 26 and the annular recessed groove 2 are engaged with each other over substantially the entire circumference thereof.
Through-hole 3 formed with the flat plate portions 33, 33 between the bent pieces 29, 31 in a state in which 4, 24 are held.
By tightening the bolts 35 and the nuts 36 that pass through the oil passages 4 and 34,
2 and 12 will be retained in an oil-tight state.

Another Embodiment Another embodiment of the second invention will be described. As shown in FIG.
Similar to the embodiment of the second invention, the retaining metal fittings 28, 28
And one of the oil passage pipes 10,
The annular ridges 37, 38 as engaging projections over the entire circumference of the outer peripheral surface are formed near the respective open ends 10a, 12a of the oil passage pipe 12 inserted and fitted in the oil passage pipe 10 in an oil tight state.
Is formed. Then, the oil passage pipe 10 is connected to the oil passage pipe 12
Oil passage piping 1 in the state where they are inserted and fitted and face each other
A pair of retaining metal fittings 28, so as to sandwich 0 and 12
28 is fastened with bolts 35 and nuts 36 and fixed.
Each bent piece 2 of the retaining metal fittings 28, 28 in the fastening
The oil passages 9 and 31 are provided so that the respective semicircular cutout portions 30 and 32 are fitted to the outer peripheral surface of the furrow apart from the respective open ends 10a and 12a of the respective annular ridges 37 and 38. Even if the pipes 10 and 12 try to come out from each other, the movements of the annular projections 37 and 38 to the bent pieces 29 and 31 are prevented from coming into contact with the bent pieces 29 and 31, so that they are prevented from coming off.

Another embodiment of the second invention will be described. As shown in FIGS. 6A, 6 </ b> B, and 7, the pair of retaining metal fittings 39 are for fixing one end 39 a in a connected state and fastening the other end with a crocodile bolt 40 and a nut 41. The retainer 39 is made of sheet metal in which the flanges 42 are connected in series, and each retainer 39 is bent into a semi-cylindrical shape, and the bent pieces 43, 43 that form the bottoms of both ends thereof are formed.
The semicircular cutout portions 46 and 47 that engage with the annular recessed grooves 44 and 45 of the oil passage pipes 10 and 12 are formed in the base plate. With this structure, the oil passage pipes 10 and 12 fitted and connected to each other are connected.
When preventing the disengagement of the oil, the pair of retaining metal fittings 39, 39 is provided at the connection portion of the fitting-connected oil passage pipes 10, 12.
After making the flange portions 42, 42 of each other slightly apart from each other, and making the semicircular cutout portions 46, 47 substantially engage with the annular concave grooves 44, 45 of the oil passage pipes 10, 12,
The flange portions 42, 42 are brought into close contact with each other so that the annular recessed grooves 44, 45 and the semicircular cutout portions 46, 47 are completely engaged with each other, and then the flange portions 42 are secured by the bolt 40 and the nut 41. , 42 are fastened and fixed.

In the second aspect of the present invention, one oil passage pipe may be formed with a concave groove for engagement, and the other oil passage pipe may be formed with a convex ridge for engagement.

In the first invention and the second invention, the engaging groove or engaging convex portion of the oil passage pipe is not formed over the entire circumference of the pipe, but is formed only partly along the circumferential direction. good.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall side view showing a riding lawn mower as an example of a work vehicle.

FIG. 2 is a schematic explanatory view showing an oil cooler.

FIG. 3 is a vertical cross-sectional side view (a) and a vertical cross-sectional rear view (b) showing the oil passage pipe retaining structure in the first invention.

FIG. 4 is a vertical cross-sectional side view (a) and a vertical cross-sectional rear view (b) showing an oil passage pipe retaining structure in the second invention.

FIG. 5 is a vertical sectional side view showing an oil passage pipe retaining structure according to another embodiment of the second invention.

FIG. 6 is a vertical sectional front view (a) and a vertical sectional side view (b) showing an oil passage pipe retaining structure according to another embodiment of the second invention.

FIG. 7 is a perspective view showing a split retainer of the oil passage pipe retainer structure of FIG. 6;

FIG. 8 is a vertical sectional side view showing an oil passage pipe retaining structure of a first comparative example.

FIG. 9 is a vertical sectional front view showing a retaining structure for an oil passage pipe of a first comparative example.

FIG. 10 is a vertical sectional side view (a) showing a retaining structure for an oil passage pipe of a second comparative example, and a perspective view thereof (b).

FIG. 11 is a vertical sectional front view showing an oil passage pipe retaining structure according to another embodiment of the second comparative example.

[Explanation of symbols]

 10, 12 Oil passage pipe 18 Engagement recess 20 Engagement fitting 22 Engagement part 24 26 Engagement recess 37, 38 Engagement projection 39 Split retaining fitting

Claims (2)

[Claims] 1. An oil passage pipe joint structure for a vehicle, wherein an oil passage pipe (10) on one side and an oil passage pipe (12) on the other side are fitted and connected to each other, wherein the oil on the one side is provided. The passage pipe (10) is provided with a retaining metal fitting (20) which is detachable by fastening and releasing the fastening, and an engaging recess (1) formed on the outer peripheral surface of the oil passage pipe (12) on the other side.
8) or the convex portion for engagement to engage with the oil passage pipe (1
2) A vehicle oil passage pipe joint structure in which a retaining portion (22) for restricting the movement of 2) is provided in the retaining metal fitting (20). 2. An oil passage pipe joint structure for a vehicle, wherein an oil passage pipe (10) on one side and an oil passage pipe (12) on the other side are fitted and connected to each other. Side oil passage piping (10), (1
Engagement recesses (24), (26) formed on the outer peripheral surface of 2)
Alternatively, the engaging projections (37) and (38) are provided with locking portions (28) and (30) which engage with each other in a state where the oil passage pipes (10) and (12) are prevented from coming off. Line piping (10),
The split retaining fittings (39) and (39) are divided into two parts with the radial direction of (12) being the perspective direction, and both split retaining fittings (39) and (39) are formed.
The oil passage pipe joint structure of the vehicle configured so that they can be fastened and fixed to each other in the perspective direction.