JP3523421B2 - Rear frame structure of rear engine vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear frame structure for a rear engine vehicle, and more particularly to a technique for improving maintainability of an engine and its peripheral parts.

[0002]

2. Description of the Related Art Conventionally, in a rear engine vehicle such as a bus in which an engine is mounted behind a rear axle, the rear axle to the rearmost end of the vehicle is aimed to secure a sufficient wheelbase within a certain length of the vehicle body. In order to reduce the rear overhang in the front-rear direction of the vehicle, an engine layout is known in which the engine and the transmission are placed laterally in the vehicle rear direction in the vehicle width direction and the rear wheels are driven. No. 43519, etc.).

By the way, in a rear engine vehicle, when the engine and the transmission are placed sideways, the maintainability of the engine and its peripheral parts may be deteriorated. Therefore, a rear frame (support frame) for mounting the engine and the transmission assembly. A rear frame structure having improved maintainability has been devised by connecting the rear frame to the lower surface of the rear end of the side rail with a fastening member composed of a bolt and a nut in a freely attachable and detachable manner. -4
8833 publication).

[0004]

However, in the structure in which the rear frame is connected from the lower surface of the rear end of the side rail, it is difficult to mount the rear frame unless there is equipment such as a pit, and the output of the transmission is high. When performing light maintenance such as transfers connected to the shaft,
There was a problem that it took too much time to remove the entire rear frame.

In view of the conventional problems as described above, the present invention improves the mountability of the rear frame to the side rails and allows the rear engine vehicle to perform light maintenance without removing the entire rear frame. The purpose of the present invention is to provide a rear frame structure.

[0006]

Therefore, according to the invention of claim 1, in a rear frame structure of a rear engine vehicle in which an engine is mounted laterally behind a rear axle, a side rail extending in a longitudinal direction of a vehicle body is provided. A mounting bracket that is removably attached to the upper surface of the rear end portion by a first fastening member, a first cross member that is coupled to the mounting bracket and extends in the vehicle width direction, and is located behind the first cross member. A second cross member extending in the vehicle width direction; a first side member that serves as a fixed portion on the front side of the engine and that connects the first cross member and the second cross member; A first engine fixing bracket which is connected to one cross member and serves as a fixing portion on one side of the rear side of the engine, and another of the rear side of the engine which is connected to the second cross member. A second engine fixing bracket serving as a fixing portion on one side, and the first cross member and the second cross member that are located between the first side member and the first and second engine fixing brackets. A second side member connected to the second side member and the second side member facing the rear side of the engine.
And a side frame removably coupled to the one end of the cross member by the second fastening member.

According to a second aspect of the present invention, in addition to the rear frame structure of the rear engine vehicle according to the first aspect, a first frame connecting the first engine fixing bracket and a position between both ends of the second side member is connected. A connecting member of Claim 3
In addition to the rear frame structure of the rear engine vehicle according to claim 1 or 2, the invention described in the above is a radiator attachment bracket for attaching a radiator to the other end of the second cross member facing the front side of the engine. Combined.

According to a fourth aspect of the present invention, in addition to the rear frame structure for a rear engine vehicle according to any one of the first to third aspects, the first engine is provided along the first cross member. A second connecting member is provided to connect the fixing bracket and the second side member. In the invention according to claim 5, the side frame extends in the vertical direction, and first and second vertical members extend substantially in the vertical direction, and extend in the vehicle front-rear direction to connect the first and second vertical members. And a third connecting member, wherein the first and second vertical members and the third connecting member are separably fastened by a third fastening member.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of an embodiment of a rear frame structure of a rear engine vehicle according to the present invention. A pair of side rails 1 extending in the vehicle front-rear direction is shown.
A rear frame (supporting frame) 2 for mounting the engine 20 and its peripheral parts (details will be described later) is detachably attached to the upper surface of the rear end of a and 1b by a bolt and nut (not shown). Are joined by.

An engine 20, a clutch 21 integrally assembled with the engine 20, and a transmission 22 are horizontally mounted on the rear frame 2 in the vehicle width direction. The output (driving force) from the transmission 22 is
Transfer 23, propeller shaft 24, turning device 2
5, the propeller shaft 27 and the differential gear 2 in which the universal joints 26a and 26b are interposed
8 is transmitted to the rear axle 29. Incidentally, 30 which has not been described above is a cross member as a cross member forming a part of the frame of the vehicle body, and 31 is a radiator.

As shown in FIG. 2, the rear frame 2 includes mounting brackets 3a and 3b which are mounting portions to the upper surfaces of the rear ends of the side rails 1a and 1b, and the mounting brackets 3a and 3b.
a front end cross member 4 (first cross member) that is coupled to the vehicle b and extends in the vehicle width direction to form a front end portion of the rear frame 2, and a rear end of the front end cross member 4 that extends in the vehicle width direction. The rear end cross member 5 (second cross member) that is present to form the rear end of the rear frame 2 and a front engine mount (fixing portion) that fixes the front side of the engine 20 and the front end cross member 4 A side member 6 (first side member) that connects the rear end cross member 5 with the rear end cross member 5;
Rear engine mount 7a for fixing one side of the rear side
(First engine fixing bracket), a rear engine mount 7b (second engine fixing bracket) coupled to the rear end cross member 5 and fixing the other side of the engine 20, a side member 6 and a rear engine. Mount 7a,
7b, a side member 8 (second side member) that connects the front end cross member 4 and the rear end cross member 5, and the rear engine mount 7a and the side member 8
Of the engine 2 and a reinforcing member 9 (first connecting member) that enhances the rigidity of the rear frame 2 by connecting the positions of both ends of the engine 2 to each other.
A radiator mounting bracket 10 that is coupled to one end of a rear end cross member 5 that is the front side of 0 and that mounts a radiator 31, and a side frame 11 that is detachably coupled to the other end of the rear end cross member 5 are configured. Has been done. The mounting brackets 3a and 3b, the front end cross member 4, the rear end cross member 5, the side member 6, the rear engine mounts 7a and 7b, the side member 8, the reinforcing member 9, and the radiator mounting bracket 10 are welded at their joints. It is fixed by. Note that these bonds may be permanent bonds similar to welding, for example, rivet bonds or the like.

The side frame 11 is further separable. That is, side members 11a and 11b (first vertical members) that extend in the vertical direction and are connected to each other, and side members 11c that extend in the vertical direction.
(Second vertical member) and side members 11a and 11c
And a connecting member 11d (third connecting member) that connects the lower ends of the two members, and each member is connected to each other by a fastening member 16 including a bolt and a nut (see FIG. 3 (b)). ). It should be noted that the side frame 11 does not have to have a configuration in which each member can be separated as in the present embodiment, and for example, each member may be integrally joined to each other by welding or the like.

Here, the connection form of the side rails 1a and 1b and the rear frame 2 and the connection form of the side frame 11 will be described with reference to FIG. In FIG. 3 (a) showing the details of the joint between the side rail 1a and the mounting bracket 3a, the mounting bracket 3a is fixed to the member 12 having a channel-shaped cross section by welding or the like inside the cross section in order to increase the rigidity of the member 12. A triangular reinforcing member 13
The front end cross member 4 having a channel-shaped cross section is fixed to the upper inside of the cross section by welding or the like. And the mounting bracket 3 configured in this way
The a is fastened to the upper surface of the rear end of the side rail 1a by a fastening member 14 including a bolt and a nut. In this case, as shown in FIG. 3 (a), if the height of the front end cross member 4 is set to be substantially the same as the total height of the mounting bracket 3a and the side rails 1a, the flange 4a at the lower end of the front end cross member 4 is used to form the rear end. Since the movement of the frame 2 is restricted, the connection of the rear frame 2 is made more rigid, which is preferable. The cross-sectional shapes of the mounting bracket 3a and the front end cross member 4 do not necessarily have to be the channel shape as in the present embodiment, and may be, for example, an angle shape or a box shape.

As shown in FIG. 3B, the side frame 11 and the rear end cross member 5 are connected to each other at the lower end of the side member 11a which constitutes the side frame 11 at one end of the rear end cross member 5. The parts are connected by a fastening member 15 composed of a bolt and a nut. According to the rear frame structure having the above-described configuration, when the engine 20, the clutch 21, the transmission 22, etc. mounted on the rear frame 2 are disassembled and maintained, the side rails 1a, 1
By separating b from the rear frame 2, such disassembly and maintenance can be performed outside the vehicle body, and maintainability is improved. Further, since the rear frame 2 is connected to the upper surfaces of the rear end portions of the side rails 1a and 1b, for example, the rear frame 2 on which the engine 20 is mounted by a forklift or the like is attached to the rear end portions of the side rails 1a and 1b. The upper frame can be positioned and brought into contact with the upper face, and can be easily joined from the upper part by a fastening member including a bolt and a nut, so that the rear frame 2 can be easily attached and detached even without large equipment such as a pit. Further, at the time of performing light maintenance such as inspection and maintenance of the transfer 23, the rear frame 2 can be removed by removing the side frame 11, or side members 11a to 11c and the connecting member 11d which configure the side frame 11 as necessary. Light maintenance can be performed without it, and maintainability can be improved. That is, the rear frame 2 is removed to perform maintenance outside the vehicle body, or only the side frame 11 is removed to remove the engine 2
Since it is possible to carry out light maintenance of 0 peripheral parts, these selections are made according to the difficulty of maintenance, and maintainability can be further improved.

FIG. 4 shows another embodiment of the rear frame structure of the rear engine vehicle according to the present invention.
In addition to the configuration of the rear frame 2 shown in FIG. 1, a connecting member 17 that connects the side member 8 and the rear engine mount 7a
The (second connecting member) is joined along the front end cross member 4 by welding or the like. This connecting member 1
7, when the propeller shaft 27 between the deflector 25 and the differential gear 28 falls off, the connecting member 17 and the reinforcing member 9 restrict the vertical movement of the propeller shaft 27, and thus the propeller shaft 2
7 can be prevented from hitting an oil pan (not shown) located below the engine 20, and the strength of the rear engine mount 7a can be improved.

[0016]

As described above, according to the first aspect of the invention, when the engine or the like mounted on the rear frame is disassembled and maintained, the rear frame is mounted on the side of the rear frame with the engine and the like mounted. Since it can be separated from the rail, that is, the vehicle body, such disassembly and maintenance can be performed outside the vehicle body, and maintainability is improved. Further, since the rear frame is connected to the upper surface of the rear end of the side rail, the rear frame can be easily attached and detached even without a large facility such as a pit. Furthermore, since the side frame can be removed without removing the entire rear frame at the time of inspecting and maintaining the engine peripheral parts such as the transfer, the maintainability can be improved.

According to the second aspect of the invention, since the first connecting member for connecting the first engine fixing bracket and the position between both ends of the second side member is provided, the first engine fixing bracket is provided. It is possible to improve the strength of the rear frame and the torsional strength of the entire rear frame. According to the invention described in claim 3, since the radiator mounting bracket for mounting the radiator is coupled to the other end of the second cross member, it is not necessary to provide the radiator mounting bracket in the engine room, and the inside of the engine room is wide. Therefore, maintainability can be improved.

According to the fourth aspect of the invention, the first engine fixing bracket and the second engine fixing bracket are provided along the first cross member.
Since the second connecting member for connecting to the side member is provided, the strength of the first engine fixing bracket is improved, and, for example, when the propeller shaft passes under the second connecting member. When the propeller shaft falls off, the upward movement of the propeller shaft is restricted by the second connecting member, and it is possible to prevent the propeller shaft from hitting an oil pan or the like located under the engine.

According to the fifth aspect of the present invention, the side frame can be further separated, so that it is possible to remove only a part of the side frame, if necessary, without removing the entire side frame, further improving maintainability. can do.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a rear frame structure according to the present invention.

FIG. 2 is a detailed configuration diagram of the same rear frame as above.

FIG. 3 is a view showing a combined form of the above rear frame,
(a) Detailed view of the side rail joint, (b) Detailed view of the side frame joint

FIG. 4 is a schematic configuration diagram showing another embodiment of the rear frame structure according to the present invention.

[Explanation of symbols]

1a, 1b Side rail 2 rear frame 3a, 3b mounting bracket 4 Front end cross member 5 Rear end cross member 6 side members 7a, 7b Rear engine mount 8 side members 9 Reinforcement member 10 radiator mounting bracket 11 side frame 11a-11c Side member 11d connection member 20 engine 29 Rear axle 31 radiator

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hide Iiyama, 1-chome, Ichichome, Ageo City, Saitama Prefecture, Nissan Nissan Diesel Industry Co., Ltd. (56) References 58-43519 (JP, U) -48833 (JP, U) Actual development Sho 59-135230 (JP, U) Actual development Sho 59-24623 (JP, U) Actual development Sho 59-135229 (JP, U) (58) Fields investigated (Int.Cl . ^7, DB name) B60K 5/04 B60K 5/10 B60K 5/12 B62D 21/00 B62D 21/02 B62D 21/12 B62D 25/08

Claims (5)

(57) [Claims] 1. In a rear frame structure of a rear engine vehicle in which an engine is mounted laterally behind a rear axle, a first fastening member is detachably attached to an upper surface of a rear end of a side rail extending in a longitudinal direction of a vehicle body. A mounting bracket, a first cross member coupled to the mounting bracket and extending in the vehicle width direction, and a second cross member located rearward of the first cross member and extending in the vehicle width direction, A first side member that serves as a fixed portion on the front side of the engine and that connects the first cross member and the second cross member, and one side of the rear side of the engine that is coupled to the first cross member A first engine fixing bracket serving as a fixing portion on one side, and a second engine fixing bracket serving as a fixing portion on the other side of the rear side of the engine that is coupled to the second cross member. A second side member that is located between the first side member and the first and second engine fixing brackets and connects the first cross member and the second cross member; A rear frame structure for a rear engine vehicle, comprising: a side frame removably coupled by a second fastening member to one end of the second cross member facing the side. 2. A rear frame structure for a rear engine vehicle according to claim 1, further comprising a first connecting member for connecting the first engine fixing bracket and a position between both ends of the second side member. The rear frame structure of the rear engine car, which is characterized by that. 3. A radiator mounting bracket for mounting a radiator to the other end portion of the second cross member facing the front side of the engine, in addition to the rear frame structure of the rear engine vehicle according to claim 1 or 2. The rear frame structure of the rear engine car is characterized by combining 4. The rear frame structure for a rear engine vehicle according to claim 1, wherein the first engine fixing bracket and the second engine fixing bracket are provided along the first cross member. A rear frame structure for a rear engine vehicle, characterized in that a second connecting member for connecting with a side member is provided. 5. The side frame includes first and second vertical members extending in a substantially vertical direction, and a third vertical member extending in a vehicle body front-rear direction to connect the first and second vertical members. And a connecting member, wherein the first and second vertical members and the third connecting member are separably fastened by a third fastening member. The rear frame structure of the rear engine vehicle according to any one of 4 above.