Full-floating type arrangement method for power-assisted steering oil cylinder

Abstract

The invention relates to a full-floating type arrangement method for a power-assisted steering oil cylinder. The problems existing in an arrangement method that one end of the power-assisted steering oil cylinder of a heavy truck is fixed and the other end of the power-assisted steering oil cylinder is floating at present are solved. An oil cylinder (1) is installed in a long hole (k) formed in a support (4), a trunnion base (12), a trunnion (11) and a lining (9) are welded to the upper position and the lower position of the oil cylinder (1), the lining (9) is installed in a round hole of a sliding block (8) in a pressed mode, the sliding block (8) provided with the lining (9) is installed on the trunnion (11) in a clearance fit mode, a pressing plate (7) is installed on the trunnion (11), a nut (6) is screwed on the trunnion (11), and a gap exists between the sliding block (8) and the pressing plate (7) in the axial direction of the trunnion (11). The sliding block (8) can freely slide in the long hole (k) of the support (4), and the pressing plate (7) can freely move in the length direction of the long hole (k) of the support (4) within the limited range of the guide strip (a1) and the guide strip (a2).

Description

Technical Field

[0001] The invention relates to a steering power-assist oil cylinder, and in particular to a full-floating arrangement method of a steering power-assist oil cylinder. Background Art

[0002] At present, the layout method of heavy-duty truck steering power cylinder is a fixed one-end and floating one-end layout method. With this layout method, the power cylinder has a rod cavity and a rodless cavity, which leads to the difference in the steering control force and oil volume requirements in the left and right directions when the vehicle turns left and right. And when the power assistance is required, the cylinder diameter is large and the piston rod diameter is small. Usually, the cylinder cannot achieve middle support, and the only layout method is to use a fixed one-end and floating one-end layout method. There is no support point in the middle of the cylinder. Due to the increase in the weight of the cylinder, the cylinder barrel and piston rod will be worn eccentrically and the bending moment of the piston rod will increase. After long-term use, it will cause the piston rod to bend and the cylinder to leak. If failures are to be avoided, multiple small-diameter power cylinders must be used to implement power assistance, which will significantly increase the difficulty of cylinder layout, the complexity of the steering hydraulic system, and the cost. Summary of the invention

[0003] This patent is proposed to solve the following problems: when the vehicle turns left and right, the difference in steering control force and oil demand in the left and right directions is aggravated; when large power assistance is required, if a single cylinder power assistance is used, the eccentric wear of the cylinder barrel and piston rod and the bending moment borne by the piston rod will increase, and long-term use will lead to piston rod bending and cylinder leakage failure; if multi-cylinder power assistance is used, it will lead to the difficulty of cylinder layout, the complexity of the steering hydraulic system and the cost will increase significantly.

[0004] The present invention is achieved by the following technical solutions:

[0005] A fully floating arrangement method for a steering power cylinder, wherein a grooved support (4) is fixed on a crossbeam (3) or a vehicle axle by welding or bolt connection, the two ends of the crossbeam (3) are fixed on the inner sides of the left and right longitudinal beams of a vehicle frame, the cylinder (1) is installed in the groove of the support (4), the upper and lower wing surfaces of the support (4) are provided with long holes (k) perpendicular to the axis of the cylinder (1), the two ends of the piston rod of the cylinder (1) are respectively connected to a left swing arm (2) and a right swing arm (5), the cylinder (1) is symmetrically welded with a trunnion base (12) and a trunnion (11) in sequence at the middle upper and lower positions along the axis, the trunnion (11) is located on the trunnion base (12), a bushing (9) is pressed into a circular hole of a slider (8), the slider (8) provided with the bushing (9) is installed on the trunnion (11), the bushing (9) and the trunnion (11) are clearance-matched, and then a pressure plate (12) with a hole in the middle is installed. 7) is installed on the ear shaft (11), and then the nut (6) is tightened on the ear shaft (11) with a shoulder and a thread at the end, so that the slider (8) and the pressure plate (7) are limited in the axial direction of the ear shaft (11), and there is a gap between the slider (8) and the pressure plate (7) along the axial direction of the ear shaft (11), ensuring that the slider (8) and the pressure plate (7) can rotate freely relative to the axis of the ear shaft (11), and the slider (8) can slide freely in the long hole (k) of the support (4). Guide strips (a1) and guide strips (a2) are welded on both sides of the long hole (k) on the wing surface of the support (4), respectively. The pressure plate (7) can move freely on the wing surface of the support (4) along the length direction of the long hole (k) of the support (4) within the limited range of the guide strips (a1) and the guide strips (a2), ensuring that the cylinder ear shaft (11) does not rotate along the axis of the cylinder during the movement.

[0006] The piston rod of the oil cylinder (1) is of full length, and the effective action areas of the left and right working chambers of the oil cylinder are the same.

[0007] The present invention overcomes the problem of large differences in steering control force and oil volume requirements in the left and right directions when the vehicle turns left and right; it overcomes the problem that when a large power assist is required, if a single oil cylinder is used for power assist, the cylinder barrel and the piston rod will be worn eccentrically and the bending moment borne by the piston rod will increase, and long-term use will lead to the occurrence of piston rod bending and oil cylinder leakage failures; if multi-cylinder power assist is used, the use of the present invention overcomes the problems of difficulty in arranging the oil cylinders, the complexity of the steering hydraulic system and the significant increase in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the full floating arrangement of the steering power cylinder of the present invention;

[0009] Figure 2 It is a schematic diagram of the connection between the oil cylinder and the support of the present invention;

[0010] Figure 3 It is a schematic diagram of the oil cylinder piston rod of the present invention;

[0011] Figure 4 It is an exploded view of the connecting parts of the oil cylinder and the support of the present invention. DETAILED DESCRIPTION

[0012] The invention discloses a fully floating arrangement method of a steering booster oil cylinder.

[0013] See also Figure 1 , Figure 2 The support (4) is fixed on the cross beam (3) by welding or bolt connection, and the cross beam (3) is fixed to the inner sides of the left and right longitudinal beams of the frame through both ends. Of course, the support (4) can also be fixed on the axle. The oil cylinder (1) is installed in the long hole (k) of the support (4), and the two ends of the piston rod of the oil cylinder (1) are respectively connected to the left swing arm (2) and the right swing arm (5).

[0014] See also Figure 3 The piston rod of the oil cylinder (1) is of full length, and the effective action areas of the left and right working chambers of the oil cylinder are the same.

[0015] See also Figure 4 The oil cylinder (1) is symmetrically welded with a trunnion base (12) and a trunnion (11) at the middle upper and lower positions along the axis. The bushing (9) is pressed into the round hole of the slider (8), and the slider (8) equipped with the bushing (9) is installed on the trunnion (11), and the bushing (9) and the trunnion (11) are clearance-matched. Then, the pressure plate (7) with a hole in the middle is installed on the trunnion (11), and the nut (6) is tightened on the trunnion (11) with a shoulder and a thread at the end, so that the slider (8) and the pressure plate (7) are limited in the axial direction of the trunnion (11), and there is a certain gap between the slider (8) and the pressure plate (7) along the axial direction of the trunnion (11), so as to ensure that the slider (8) and the pressure plate (7) can rotate freely relative to the axis. The slider (8) can slide freely in the long hole (k) of the support (4), and a guide strip (a1) and a guide strip (a2) are respectively welded on both sides of the long hole (k) on the wing surface of the support (4). The pressure plate (7) can move freely on the wing surface of the support (4) along the length direction of the long hole (k) of the support (4) within the limited range of the guide strips (a1) and (a2), thereby ensuring that the cylinder ear shaft (11) does not rotate along the cylinder axis during the movement, resulting in failure of the cylinder booster.

[0016] The working principle of the present invention is as follows:

[0017] When the piston rod of the oil cylinder (1) performs steering assistance to the left, the oil cylinder (1) will generate a rotational motion along the axis of the ear shaft (11), and at the same time, the ear shaft (11) of the oil cylinder (1) will move inward along the long hole (k) of the support (4). During the movement, the ear shaft (11) of the oil cylinder (1) rotates in the bushing (9), and the slider (8) slides freely in the long hole (k) of the support (4). During the movement, the oil cylinder (1) is reliably supported on the support (4), which can effectively prevent the oil cylinder from eccentric wear and the piston rod from bending failure, and effectively realize the steering assistance function of the oil cylinder. When the piston rod of the oil cylinder (1) performs steering assistance to the right, the principle is the same as above.

[0018] The oil cylinder piston rod in the present invention not only plays the role of the oil cylinder thrust rod, but also plays the role of connecting the left and right steering swing arms and determining the angular relationship of the left and right swing arms; the oil cylinder adopts a connection and installation method in which the middle floating support is adopted and the two ends move freely within the rotation trajectory defined by the swing arm; the oil cylinder can rotate freely along the ear shaft, and at the same time, the oil cylinder can move linearly along the guide long hole driven by the ear shaft.

Claims

1. A fully floating arrangement method for a steering power cylinder, characterized in that: The grooved support (4) is fixed on the cross beam (3), and the two ends of the cross beam (3) are fixed on the inner sides of the left and right longitudinal beams of the vehicle frame. The oil cylinder (1) is installed in the groove of the support (4). The upper and lower wing surfaces of the support (4) are provided with long holes (k) perpendicular to the axis of the oil cylinder (1). The two ends of the piston rod of the oil cylinder (1) are respectively connected to the left swing arm (2) and the right swing arm (5). The oil cylinder (1) is symmetrically welded with a trunnion base (12) and a trunnion (11) in sequence at the middle upper and lower positions along the axis. The trunnion (11) is located on the trunnion base (12). The bushing (9) is pressed into the circular hole of the slider (8). The slider (8) equipped with the bushing (9) is installed on the trunnion (11). The bushing (9) and the trunnion (11) are clearance-matched. Then the pressing plate (7) with a hole in the middle is installed on the trunnion (11). , and then tighten the nut (6) onto the ear shaft (11) so that the slider (8) and the pressure plate (7) are limited in the axial direction of the ear shaft (11). There is a gap between the slider (8) and the pressure plate (7) along the axial direction of the ear shaft (11), ensuring that the slider (8) and the pressure plate (7) can rotate freely relative to the axis of the ear shaft (11), and the slider (8) can slide freely in the long hole (k) of the support (4). Guide strips (a1) and guide strips (a2) are welded on both sides of the long hole (k) on the wing surface of the support (4), respectively. The pressure plate (7) can move freely on the wing surface of the support (4) along the length direction of the long hole (k) of the support (4) within the limited range of the guide strips (a1) and the guide strips (a2), ensuring that the cylinder ear shaft (11) does not rotate along the axis of the cylinder during the movement.

2. A fully floating arrangement method of a steering power cylinder according to claim 1, characterized in that: The piston rod of the oil cylinder (1) is of full length, and the effective action areas of the left and right working chambers of the oil cylinder are the same.

3. The method for fully floating arrangement of a steering power cylinder according to claim 1, characterized in that: The grooved support (4) is fixed on the crossbeam (3) by welding or bolt connection.

4. The method for fully floating arrangement of a steering power cylinder according to claim 1, characterized in that: The grooved support (4) is fixed on the vehicle axle.

5. The method for fully floating arrangement of a steering power cylinder according to claim 1, characterized in that: The end of the nut (6) is provided with a shaft shoulder.

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