A full-floating arrangement for a power steering cylinder

Abstract

The present application relates to a kind of steering assist cylinder full floating arrangement method, solve the current heavy truck steering assist cylinder one end fixed, one end floating arrangement method exists Problem.Oil cylinder (1) is installed in the long hole (k) opened in support (4), and the trunnion base (12) is welded on the upper and lower position of oil cylinder (1), trunnion (11), bushing (9) is pressed into the round hole of slider (8), slider (8) is assembled with clearance on trunnion (11) with bushing (9), pressing plate (7) is assembled on trunnion (11), nut (6) is tightened on trunnion (11), slider (8) and pressing plate (7) exist clearance along the axial direction of trunnion (11), slider (8) can freely slide in the long hole (k) of support (4), and pressing plate (7) can be freely moved along the length direction of long hole (k) of support (4) within the range defined by guide bar (a1) and guide bar (a2).

Description

TECHNICAL FIELD

[0001] The present application relates to a steering assist cylinder, in particular to a full-floating arrangement method of a steering assist cylinder. BACKGROUND

[0002] The current arrangement method of the heavy truck steering assist cylinder is one end fixed and one end floating. With this arrangement method, the assist cylinder has a rod cavity and a rodless cavity, which exacerbates the difference in steering control force and oil demand between the left and right directions when the vehicle turns left and right. And in the case of large assist demand, the cylinder diameter is large and the piston rod diameter is small. Usually, the oil cylinder cannot realize the middle support, and can only adopt the arrangement method of one end fixed and one end floating. There is no support point in the middle of the oil cylinder, and due to the increase of the weight of the oil cylinder, the eccentric wear of the cylinder barrel and the piston rod and the bending moment of the piston rod are increased, which will cause the piston rod to bend and the oil cylinder to leak after long-term use. If you want to avoid failure, you must use multiple small-diameter assist cylinders to implement assist, which will significantly increase the difficulty of oil cylinder arrangement, the complexity of the steering hydraulic system and the cost. SUMMARY

[0003] The present application is proposed to solve the problem of the difference in steering control force and oil demand between the left and right directions when the vehicle turns left and right; in the case of large assist demand, if a single oil cylinder assist is used, the eccentric wear of the cylinder barrel and the piston rod and the bending moment of the piston rod are increased, which will cause the piston rod to bend and the oil cylinder to leak after long-term use; if multiple oil cylinder assists are used, it will significantly increase the difficulty of oil cylinder arrangement, the complexity of the steering hydraulic system and the cost.

[0004] The present application is realized 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 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, and then the pressure plate ( 7) is mounted on the ear shaft (11), and 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). 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 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 large power assistance is required, if a single oil cylinder is used for power assistance, the cylinder barrel and piston rod will suffer eccentric wear and the bending moment borne by the piston rod will increase, and long-term use will lead to piston rod bending and cylinder leakage failures; if multiple oil cylinders are used for power assistance, the use of the present invention overcomes the problems of difficulty in oil cylinder arrangement, complexity of the steering hydraulic system and significant increase in cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0009] Figure 2 This 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 present invention relates to a fully floating arrangement method of a steering power-assisting oil cylinder.

[0013] See also Figure 1 、 Figure 2 The support (4) is fixed to the crossbeam (3) by welding or bolt connection. The crossbeam (3) is fixed to the inner sides of the left and right longitudinal beams of the frame through its two ends. Of course, the support (4) can also be fixed to the axle. The oil cylinder (1) is installed in the long hole (k) of the support (4). 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 working 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 circular hole of the slider (8), and 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 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). There is a certain gap between the slider (8) and the pressure plate (7) along the axial direction of the trunnion (11), ensuring 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 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), ensuring that the cylinder ear shaft (11) does not rotate along the cylinder axis during the movement, resulting in failure of the cylinder assist.

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

[0017] When the piston rod of the oil cylinder (1) is turned to the left for assisting steering, 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). The oil cylinder (1) is reliably supported on the support (4) during the movement, which can effectively prevent the oil cylinder from wearing out and the piston rod from bending, and effectively realize the steering assist function of the oil cylinder. When the piston rod of the oil cylinder (1) is turned to the right for assisting steering, the principle is the same as above.

[0018] In the present invention, the cylinder piston rod not only plays the role of a cylinder thrust rod, but also connects the left and right steering swing arms and determines the angular relationship between the left and right swing arms; the 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 cylinder can rotate freely along the ear shaft, and at the same time, the cylinder can move linearly along the guide long hole driven by the ear shaft.

Claims

1. A fully floating arrangement method for a power steering cylinder, characterized by: The grooved support (4) is fixed on the crossbeam (3), and the two ends of the crossbeam (3) are fixed on the inner sides of the left and right longitudinal beams of the 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 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 pressure plate (7) with the middle opening 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 movement.

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

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

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

Images