JP2018095026A - Mounting structure for steering gear box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure for steering gear box, capable of achieving cost reduction and avoiding degradation in selection flexibility of layout conditions and shapes of a steering gear box.SOLUTION: The mounting structure for steering gear box, used to mount a steering gear box 50 on a chassis frame 10 of a vehicle 1, includes: a main bracket 60 mounted on the chassis frame 10; an intermediate bracket 61 connecting between the steering gear box 50 and the main bracket 60. The intermediate bracket 61 is structured so that the shape of the intermediate bracket 61 can be changed according to the steering gear box 50.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a steering gear box mounting structure.

  In a vehicle steering mechanism, a power steering for assisting a steering operation by a driver is widely known. In power steering, a steering gear box that amplifies the rotational force of a steering wheel by a hydraulic or electric gear mechanism is used.

  When the steering gear box is mounted on a vehicle such as a truck, the steering gear box is often fixed to the vehicle frame by a bracket as a connecting member. For example, Patent Document 1 discloses a snowplow in which a gear box is attached to a side rail of a vehicle body frame via a gear box bracket.

  The steering gear box has different layout conditions, that is, the mounting position and the mounting angle in the vehicle depending on various factors. The factors include, for example, the required steering angle of the vehicle, the size of the tire, whether the vehicle to be mounted is a large truck or a medium truck, and whether the vehicle type is a front single-axle car or a front biaxial car , Etc. In addition, the shape of the steering gear box varies depending on the type of the steering gear box.

JP 2006-15788 A

  However, if the bracket for fixing the steering gear box to the vehicle frame is separately prepared for each layout condition or shape specification of the steering gear box, it will hinder cost reduction. On the other hand, if it is going to make a bracket common to each specification, it will be necessary to make the layout condition and shape of a steering gear box common, and there exists a possibility of restricting the choice of the arrangement and the kind of a steering gear box. That is, it has been impossible to achieve both cost reduction related to the bracket for fixing the steering gear box, layout conditions of the steering gear box, and freedom of shape selection.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a steering gear box that can reduce the cost and does not reduce the layout conditions of the steering gear box and the degree of freedom in selecting the shape. It is to provide a mounting structure.

  In order to achieve the above object, a steering gear box mounting structure according to the present invention is a steering gear box mounting structure for mounting a steering gear box to a vehicle frame, and includes a main bracket mounted on the frame, An intermediate bracket for connecting a steering gear box and the main bracket, and the intermediate bracket can change a shape of the intermediate bracket according to the steering gear box.

  According to the mounting structure according to the present invention, for example, by preparing an intermediate bracket according to the layout conditions and shape specifications of the steering gear box, the main bracket can be made common over the variations of the specifications. Further, at this time, the difference in the above specifications can be absorbed by the variation of the intermediate bracket, so that the layout condition and shape of the steering gear box are not limited. Therefore, the mounting structure can suppress an increase in cost due to a difference in specifications without limiting the specifications of the steering gear box.

  According to the present invention, it is possible to provide a steering gear box mounting structure that can reduce the cost and does not reduce the layout conditions of the steering gear box and the degree of freedom in selecting the shape.

1 is a side configuration diagram of a vehicle to which a steering gear box mounting structure according to the present invention is applied. 1 is a top view showing a chassis frame of a vehicle to which a steering gear box mounting structure according to the present invention is applied. It is the elements on larger scale of the attachment structure concerning this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the content demonstrated below, In the range which does not change the summary, it can change arbitrarily and can implement. In addition, the drawings used for the description of the embodiments schematically show constituent members, and are partially emphasized, enlarged, reduced, or omitted to deepen the understanding. In some cases, the scale, shape, and the like are not accurately represented.

  FIG. 1 is a side view of a vehicle 1 to which a steering gear box mounting structure according to the present invention is applied.

  In the present embodiment, the vehicle 1 is a so-called cab-over type engine truck, and is configured as a front 1-axis rear 2-axis drive vehicle. However, the vehicle 1 may be a truck of a hybrid vehicle or a truck of an electric vehicle, and may have another axle configuration such as a front 2-axis and a rear 2-axis. The vehicle 1 includes a chassis frame 10 as a “frame”, a cab 20, a cargo box 30, and a plurality of wheels 40.

  The chassis frame 10 is a ladder-like skeleton that is long in the front-rear direction of the vehicle 1, and is a skeleton of a vehicle body that supports heavy objects mounted on the vehicle 1 such as an engine and a transmission (not shown) in addition to the cab 20 and the cargo box 30. is there.

  The cab 20 is a structure including a driver's seat 21 and is provided above the front portion of the chassis frame 10.

  The cargo box 30 is a structure on which luggage or the like is loaded, and is provided above the rear portion of the chassis frame 10.

  In the present embodiment, the wheels 40 are two wheels each attached to a front axle 43 and a rear two axles, which will be described later, and some or all of these wheels 40 are drive wheels. The vehicle 1 is run. The wheels 40 are suspended from the chassis frame 10 via an axle 43 described later, and support the weight of the vehicle 1.

  The cab 20 includes a driver wheel 21 and a steering wheel 22 for a driver of the vehicle 1 to perform a steering operation. The rotational torque applied to the steering wheel 22 is transmitted to the steering gear box 50 via the steering shaft 23 that extends under the floor of the driver's seat 21.

  The steering gear box 50 assists the steering operation by amplifying the torque applied to the steering wheel 22. When the vehicle 1 is a large truck, a relatively large rotational torque is required for steering the vehicle 1, and therefore, the steering gear box 50 is not hydraulic but is hydraulic.

  FIG. 2 is a top view showing the chassis frame 10 of the vehicle 1 to which the steering gear box mounting structure according to the present invention is applied. Here, the direction indicated by the arrow in FIG. 2 corresponds to the front of the vehicle 1, that is, the traveling direction.

  More specifically, the chassis frame 10 includes a left side rail 11L, a right side rail 11R, and a plurality of cross members 12. The left side rail 11L and the right side rail 11R extend in the front-rear direction of the vehicle 1 and are arranged parallel to each other in the vehicle width direction.

  The plurality of cross members 12 connect the left side rail 11L and the right side rail 11R to constitute the chassis frame 10 integrally. Further, some of the cross members 12 fix, for example, an engine (not shown) and support the weight thereof.

  The chassis frame 10 also supports an axle 43 serving as a common rotational axis for the left front wheel 41 and the right front wheel 42 among a plurality of wheels 40 included in the vehicle 1 via a suspension (not shown). The suspension employs an axle suspension type in the present embodiment, but may employ an independent suspension type that supports the left front wheel 41 and the right front wheel 42 independently.

  The steering gear box 50 includes a torque input unit 51, a torque output unit 52, and a pitman arm 53.

  Torque input unit 51 receives torque from a steering operation via steering shaft 23. At this time, the torque input unit 51 receives torque having the rotation direction in the height direction of the vehicle 1.

  The torque output unit 52 is configured to protrude from the steering gear box 50 with the vehicle width direction as a rotation axis, amplifies the torque input to the torque input unit 51 by hydraulic pressure, and converts the rotation direction to output. .

  One end side of the pitman arm 53 is bolted to the torque output unit 52, and the other end side of the pitman arm 53 swings in the front-rear direction of the vehicle 1 by the torque of the torque output unit 52. Here, the other end side of the pitman arm 53 is connected to the left front wheel 41 and the right front wheel 42 via a link mechanism (not shown). As the pitman arm 53 swings, the left front wheel 41 and the right front wheel 42 are steered.

  The steering gear box 50 is attached to the chassis frame 10 via a main bracket 60 and an intermediate bracket 61.

  The main bracket 60 not only fixes the steering gear box 50 attached to the side surface in the vehicle width direction via the intermediate bracket 61, but is also connected to the cab 20 disposed on the upper portion of the main bracket 60, and the weight of the cab 20 I also support. Here, the main bracket 60 is connected to each of the right side rail 11R and the bottom of the cab 20 by bolts.

  The intermediate bracket 61 has one side surface connected to the main bracket 60 by a bolt and the other side surface connected to the steering gear box 50 by a bolt. Here, the steering gear box 50 has various layout conditions such as a position and an installation angle arranged in the vehicle 1 and a shape of the steering gear box 50 according to specifications. Therefore, the shape of the other side surface of the intermediate bracket 61, that is, the connection surface with the steering gear box 50, is appropriately changed in accordance with the specifications of the steering gear box 50 and the arrangement of the bolt holes to be formed.

  Next, the aspect of the intermediate bracket 61 will be described in detail. FIG. 3 is a partially enlarged view of the steering gear box mounting structure according to the present invention. Here, two different specifications among the specifications of the steering gear box 50 will be described as a first specification and a second specification, respectively. More specifically, FIG. 3 shows a mounting structure of a steering gear box 50 (hereinafter referred to as a steering gear box 50A) according to the first specification as FIG. 3 (a), and the steering gear box according to the second specification. FIG. 3B shows a mounting structure of 50 (hereinafter referred to as a steering gear box 50B).

  3A and 3B, the shape, size, and arrangement angle of the steering gear box 50 are different between the first specification and the second specification. Further, since the shapes of the torque input unit 51, the torque output unit 52, and the pitman arm 53 are different depending on the difference between the steering gear box 50A and the steering gear box 50B, they are given different symbols (A or A at the end). B is attached.) Further, in FIGS. 3A and 3B, the size of the right front wheel 42 is also different, and is referred to as a right front wheel 42A and a right front wheel 42B, respectively.

  In FIG. 3A, for example, when the steering gear box 50A is mounted parallel to the right side rail 11R, the intermediate bracket 61 has a connection surface with the steering gear box 50A parallel to the right side rail 11R. The intermediate bracket 61A having such a shape is formed.

  In contrast, in FIG. 3B, the steering gear box 50B is connected with an angle to the right side rail 11R so as not to limit the required steering angle for steering the large right front wheel 42B. ing. More specifically, the steering gear box 50B is provided so as to approach the right side rail 11R in the direction opposite to the traveling direction (that is, the rear of the vehicle). Therefore, the intermediate bracket 61 is formed as an intermediate bracket 61B having such a shape that a connection surface with the steering gear box 50B is provided with an angle with respect to the right side rail 11R. That is, the connection surface between the intermediate bracket 61 and the steering gear box 50B approaches the right side rail 11R as it goes rearward of the vehicle.

  As shown in FIGS. 3A and 3B, the intermediate bracket 61 is formed in a different shape for each variation of specifications such as the steering gear box 50. However, the intermediate bracket 61 is thin because it only connects the main bracket 60 and the steering gear box 50, and even if a variation is prepared, it is relatively inexpensive.

  On the other hand, as described above, the main bracket 60 needs to support not only the steering gear box 50 but also the weight of the cab 20, so that a certain size and strength are required, and the weight of the main bracket 60 is also increased. Therefore, if the main bracket 60 is prepared for each variation of specifications such as the steering gear box 50, the manufacturing cost is increased.

  In the mounting structure of the steering gear box 50 according to the present invention, as described above, the intermediate bracket 61 absorbs the difference in each specification, so that the main bracket 60 can be shared over the variations. Further, the variation of the intermediate bracket 61 does not limit the degree of freedom in selecting the arrangement and type of the steering gear box 50.

  As described above, according to the present invention, it is possible to provide a steering gear box mounting structure that can reduce the cost and does not reduce the layout condition of the steering gear box and the degree of freedom in selecting the shape.

  Although the description of the embodiment of the steering gear box mounting structure according to the present invention is finished above, the embodiment is not limited to the above embodiment. For example, in the above-described embodiment, the difference in the specification of the steering gear box 50 has been described as the difference in the mounting angle with respect to the right side rail 11 </ b> R, but, for example, when the installation position of the steering gear box 50 differs in the front-rear direction of the vehicle 1. Even if it exists, the attachment structure which concerns on this invention is applicable.

1 Vehicle 10 Chassis Frame 11L Left Side Rail 11R Right Side Rail 12 Cross Member 20 Cab 21 Driver's Seat 22 Steering Wheel 23 Steering Shaft 30 Cargo Box 40 Wheel 41 Left Front Wheel 42, 42A, 42B Right Front Wheel 43 Axle 50, 50A, 50B Steering Gearbox 51, 51A, 51B Torque input section 52, 52A, 52B Torque output section 53, 53A, 53B Pitman arm 60 Main bracket 61, 61A, 61B Intermediate bracket

Claims (1)

A steering gear box mounting structure for mounting a steering gear box on a vehicle frame,
A main bracket attached to the frame;
An intermediate bracket connecting the steering gear box and the main bracket;
The intermediate bracket has a steering gear box mounting structure in which the shape of the intermediate bracket can be changed according to the steering gear box.

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