Auxiliary box air cylinder assembly with middle position air cylinder

Abstract

The auxiliary box air cylinder assembly with the middle position air cylinder comprises a range blocking air cylinder and the middle position air cylinder which are fixedly connected, and a first cavity is formed by the range blocking air cylinder and the middle position air cylinder. A cylinder cover is arranged at the axial rear end of the middle position cylinder; a second cavity is formed between the middle position air cylinder and the air cylinder cover. An air pipe mounting hole is formed in the position, located in the middle of the second cavity, of the air cylinder, an L-shaped air pipe connector is arranged in the air pipe mounting hole, and a filter screen is arranged in the L-shaped air pipe connector; by arranging the L-shaped air pipe connector, splashing water, water mist and condensate water can be prevented from entering the air cylinder from the source, clamping stagnation caused by rusting of the inner wall of the air cylinder and a piston in the middle position is prevented, and the problems that the whole vehicle is in spraying offline detection, the vehicle running process and the power takeoff using process are solved. And external water enters the air cylinder at the middle position through the ventilation plug, so that the inner wall of the air cylinder and the piston are rusted and clamped.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of transmission, specifically is a kind of vice box cylinder assembly with intermediate position cylinder. BACKGROUND

[0002] Most of the transmission of main and vice box structure adopts rear power take-off, for example QH50 / QH70 etc., when rear power take-off stops and takes power, vice box cylinder must have the function of keeping intermediate position, thus intermediate position cylinder is designed.No matter whether the transmission is aluminum alloy or cast iron, intermediate position cylinder adopts cast iron material and steel piston, conventional vent plug.

[0003] However, for example, for the transmission of Isuzu UD truck, vice box intermediate position cylinder inner wall and piston are often rusted, and then cause gear shifting to be stuck when vice box is switched in high-low gear after power take-off is used, vice box synchronizer cannot shift in time, cause vice box synchronizer to wear early and fail, once vice box synchronizer fails early (including zero kilometers), it is often that whole box is replaced to maintain;After many rounds of fault reproduction and cause analysis, the root cause of intermediate position cylinder rust is that vent plug is waterlogged, cylinder itself is cast iron material, rusts easily after meeting water;Piston surface is blue-treated, and rust prevention effect is poor.

[0004] Therefore, it is urgent to design a structure that can effectively prevent water from entering the cylinder, avoid cylinder rusting, or even if the cylinder is unfortunately waterlogged, delay rusting time, ensure the normal work of vice box cylinder and synchronizer, effectively avoid early damage of synchronizer, and reduce after-sales claims. INVENTION CONTENTS

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a vice box cylinder assembly with intermediate position cylinder, to solve the technical problem that water from outside enters the intermediate position cylinder through the vent plug, causing the inner wall and piston of the cylinder to rust and stick during vehicle spray off-line detection, vehicle operation and power take-off use.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A vice box cylinder assembly with intermediate position cylinder, comprising a range gear cylinder and an intermediate position cylinder fixedly connected, the range gear cylinder and the intermediate position cylinder form a first cavity;The axial rear end of the intermediate position cylinder is provided with a cylinder cover;The second cavity is formed between the intermediate position cylinder and the cylinder cover;

[0008] A gas pipe mounting hole is formed in the intermediate position cylinder in the second cavity, an L-shaped gas pipe joint is arranged in the gas pipe mounting hole, and a filter screen is arranged in the L-shaped gas pipe joint.

[0009] The range block cylinder is provided with a sub-gearbox shift fork shaft, and a range block piston is sleeved on the sub-gearbox shift fork shaft; a No. 1 O-shaped ring is arranged between the range block piston and the range block cylinder; the No. 1 O-shaped ring divides the first cavity into a low gear intake cavity and a high gear intake cavity.

[0010] The intermediate position cylinder is provided with a piston connecting shaft coaxial with the sub-gearbox shift fork shaft, and the piston connecting shaft extends out of the mounting hole of the intermediate position cylinder and is sleeved with a piston.

[0011] The side wall of the range block cylinder is provided with a low gear intake hole, and the low gear intake hole is communicated with the low gear intake cavity and the outside; the intermediate position cylinder is provided with a high gear intake hole, and the high gear intake hole is communicated with the high gear intake cavity and the outside; the cylinder cover is provided with an intake hole, and the intake hole is communicated with the second cavity and the outside.

[0012] The utility model also includes the following technical features:

[0013] The range block cylinder, the intermediate position cylinder and the cylinder cover are fixedly connected by bolts.

[0014] The sub-gearbox shift fork shaft and the range block piston are fixedly connected through a self-locking nut.

[0015] A clamping spring is arranged on the piston connecting shaft at the axial rear end of the piston.

[0016] A No. 1 gasket is arranged between the cylinder cover and the intermediate position cylinder.

[0017] A metal check ring is arranged between the intermediate position cylinder and the range block cylinder.

[0018] A No. 2 gasket is arranged between the intermediate position cylinder and the range block cylinder.

[0019] A No. 2 O-shaped ring is sleeved between the range block piston and the sub-gearbox shift fork shaft; and a No. 3 O-shaped ring is sleeved between the shift fork shaft through hole on the range block cylinder and the sub-gearbox shift fork shaft.

[0020] A No. 4 O-shaped ring is arranged between the outer wall of the piston at the axial middle part and the inner wall of the intermediate position cylinder, and a No. 5 O-shaped ring is arranged between the inner wall of the piston and the piston connecting shaft.

[0021] A No. 6 O-shaped ring is arranged between the inner wall of the piston at the axial front end and the piston connecting shaft, and a No. 7 O-shaped ring is arranged between the piston connecting shaft and the mounting hole on the intermediate position cylinder.

[0022] Compared with the prior art, the utility model has the beneficial technical effects that:

[0023] The utility model discloses a kind of vice box cylinder assemblies with intermediate position cylinder, including fixedly connected range stop cylinder 2 and intermediate position cylinder 4, range stop cylinder 2 and intermediate position cylinder 4 form first cavity;The axial rear end of intermediate position cylinder 4 is provided with cylinder cover 7;Second cavity is formed between intermediate position cylinder 4 and cylinder cover 7;Range stop piston 18 is provided with No. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is sectional view structural schematic diagram of the utility model.

[0025] The meaning of each reference numeral in the figure is: 1-vice box shift shaft, 2-range stop cylinder, 3-self-locking nut, 4-intermediate position cylinder, 5-vent plug, 6-No.1 gasket, 7-cylinder cover, 8-bolt, 9-clamp spring, 10-piston, 11-No.4 O-ring, 12-No.5 O-ring, 13-No.7 O-ring, 14-piston connecting shaft, 15-retainer ring, 16-No.2 gasket, 17-No.2 O-ring, 18-range stop piston, 19-No.1 O-ring, 20-No.3 O-ring, 21-low gear intake hole, 22-high gear intake hole, 23-intake hole, 25-L-shaped air pipe joint, 26-No.6 O-ring.

[0026] The specific content of the utility model is further explained in detail in connection with the following embodiments. DETAILED DESCRIPTION

[0027] It should be noted that all parts in the utility model, without special explanation, adopt parts known in the art.

[0028] The following gives the specific embodiment of the utility model, it should be explained that the utility model is not limited to the following specific embodiment, and equivalent transformation made on the basis of the technical scheme of the application falls within the protection scope of the utility model.

[0029] The utility model gives a kind of vice box cylinder assembly with intermediate position cylinder, including fixedly connected range stop cylinder 2 and intermediate position cylinder 4, range stop cylinder 2 and intermediate position cylinder 4 form first cavity;The axial rear end of intermediate position cylinder 4 is provided with cylinder cover 7;Second cavity is formed between intermediate position cylinder 4 and cylinder cover 7;Range stop piston 18 is provided with No.1 O-ring 19 between range stop cylinder 2;No.1 O-ring 19 divides first cavity into low gear intake cavity and high gear intake cavity;

[0030] Air pipe mounting hole is set up on intermediate position cylinder 4 in second cavity, L-shaped air pipe joint 25 is provided in air pipe mounting hole, filter screen is provided in L-shaped air pipe joint 25;

[0031] The range gear cylinder 2 is provided with a sub-gear shift fork shaft 1, and the range gear piston 18 is sleeved on the sub-gear shift fork shaft 1;

[0032] The intermediate position cylinder 4 is provided with a piston connecting shaft 14 coaxial with the sub-gear shift fork shaft 1, and the piston 10 is sleeved on the end of the piston connecting shaft 14 and extends out of the installation hole of the intermediate position cylinder 4;

[0033] The side wall of the range gear cylinder 2 is provided with a low gear intake hole 21, which is connected with the low gear intake cavity and the outside; the intermediate position cylinder 4 is provided with a high gear intake hole 22, which is connected with the high gear intake cavity and the outside; and the cylinder cover 7 is provided with an intake hole 23, which is connected with the second cavity and the outside.

[0034] In the above technical solution, generally, the piston 10 in the intermediate position cylinder 4 is at the rightmost side, when the intermediate position cylinder 4 needs to be used, the compressed air from the vehicle enters the cylinder through the intake hole 23 on the intermediate position cylinder cover 7. At this time, the compressed air will act on two working surfaces, one is the piston 10, and the other is the piston connecting shaft 14 through the air passage on the piston connecting shaft 14. At this time, no matter whether the range gear cylinder 2 is high gear or low gear, the intermediate position cylinder 4 will fix the range gear piston 18 in the range gear cylinder 2 at the intermediate position under the condition that the compressed air acts on both working surfaces, which meets the use condition. At this time, the L-shaped air pipe joint 25 on the intermediate position cylinder 4 will discharge the gas to the engine compartment.

[0035] After use, the intake compressed air from the intake hole 23 on the cylinder cover 7 is cut off, and the piston 10 and the piston connecting shaft 14 in the intermediate position cylinder 4 will be pushed back to the rightmost position by the range gear piston 18 in the range gear cylinder 2. In this process, the dry air in the engine compartment will be sucked into the intermediate position cylinder, and even a small amount of dust and impurities will be filtered out by the filter screen in the L-shaped air pipe joint 25.

[0036] By setting the L-shaped air pipe joint, the splashing water, water mist and condensed water can be prevented from entering the cylinder from the source, the rusting of the intermediate position cylinder inner wall and the piston caused by the rusting of the intermediate position cylinder inner wall and the piston is prevented, and the technical problem that the water from the outside enters the intermediate position cylinder through the breather plug to cause the rusting and jamming of the intermediate position cylinder inner wall and the piston during the spray off-line detection of the vehicle, the vehicle running process and the use process of the power take-off device is solved.

[0037] Preferably, the intermediate position cylinder 4 is made of cast aluminum, which can improve the neutral salt spray test from 0-15h red rust of the original cast iron to 169h white spot; the surface of the steel piston 10 and the piston connecting shaft 14 is nitrided, which can improve the neutral salt spray test from 0-15h red rust of the original blue to 502h without obvious change;

[0038] The range gear cylinder 2, the intermediate position cylinder 4 and the cylinder cover 7 are fixedly connected by bolts 8.

[0039] In the above technical solution, the bolt connection is convenient for installation and disassembly.

[0040] The auxiliary gearbox shift fork shaft 1 and the range gear piston 18 are fixedly connected by a self-locking nut 3.

[0041] In the above technical solution, the bolt connection is convenient for installation and disassembly.

[0042] A snap spring 9 is arranged on the piston connecting shaft 14 at the axial rear end of the piston 10.

[0043] In the above technical solution, the snap spring 9 is used to fix the piston 10 and prevent it from falling off the piston connecting shaft 14.

[0044] A first gasket 6 is arranged between the cylinder cover 7 and the intermediate position cylinder 4.

[0045] In the above technical solution, the gasket 6 is used to seal the second cavity.

[0046] A metal check ring 15 is arranged between the intermediate position cylinder 4 and the range gear cylinder 2.

[0047] In the above technical solution, the metal check ring 15 is used to limit the range of movement of the piston connecting shaft 14 towards the axial front end.

[0048] A second gasket 16 is arranged between the intermediate position cylinder 4 and the range gear cylinder 2.

[0049] In the above technical solution, the gasket 16 is used to seal the connection between the intermediate position cylinder 4 and the range gear cylinder 2, i.e. to seal the high gear intake cavity.

[0050] A second O-ring 17 is arranged between the range gear piston 18 and the auxiliary gearbox shift fork shaft 1; an O-ring 20 is arranged between the shift fork shaft on the range gear cylinder 2 and the auxiliary gearbox shift fork shaft 1.

[0051] In the above technical solution, the second O-ring 17 and the O-ring 20 are used to seal the low gear intake cavity.

[0052] A fourth O-ring 11 is arranged between the outer wall of the piston 10 at the axial middle part and the inner wall of the intermediate position cylinder 4, and a fifth O-ring 12 is arranged between the inner wall of the piston 10 and the piston connecting shaft 14.

[0053] In the above technical solution, the fourth O-ring 11 and the fifth O-ring 12 are used to seal the second cavity.

[0054] The inner wall of the piston 10 at the axial front end is provided with a No. 6 O-ring 26, and the piston connecting shaft 14 is provided with a No. 7 O-ring 13 between the mounting hole on the intermediate position cylinder 4.

[0055] In the above technical solution, the No. 7 O-ring 13 and the No. 6 O-ring 26 are used to seal the cavity formed by the piston 10 and the piston connecting shaft 14.

Claims

1. A secondary cylinder assembly with an intermediate position cylinder, characterized in that, It includes a range-blocking cylinder (2) and an intermediate position cylinder (4) that are fixedly connected, the range-blocking cylinder (2) and the intermediate position cylinder (4) forming a first cavity; a cylinder cover (7) is provided at the axial rear end of the intermediate position cylinder (4); a second cavity is formed between the intermediate position cylinder (4) and the cylinder cover (7); An air pipe mounting hole is provided on the cylinder (4) located in the middle of the second cavity. An L-shaped air pipe connector (25) is provided in the air pipe mounting hole, and a filter screen is provided in the L-shaped air pipe connector (25). The range-blocking cylinder (2) is provided with a secondary gearbox shift fork shaft (1), and a range-blocking piston (18) is sleeved on the secondary gearbox shift fork shaft (1); a first-order O-ring (19) is provided between the range-blocking piston (18) and the range-blocking cylinder (2); the first-order O-ring (19) divides the first cavity into a low-gear intake cavity and a high-gear intake cavity; The intermediate position cylinder (4) is provided with a piston connecting shaft (14) coaxial with the auxiliary box shift fork shaft (1). The end of the piston connecting shaft (14) extends out of the mounting hole on the intermediate position cylinder (4) and is fitted with a piston (10). The side wall of the range-blocking cylinder (2) is provided with a low-gear air inlet (21), which connects the low-gear air inlet chamber to the outside; the middle position cylinder (4) is provided with a high-gear air inlet (22), which connects the high-gear air inlet chamber to the outside; the cylinder cover (7) is provided with an air inlet (23), which connects the second cavity to the outside.

2. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, The range stop cylinder (2), the intermediate position cylinder (4), and the cylinder head (7) are fixedly connected by bolts (8).

3. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, The auxiliary gearbox shift fork shaft (1) and the range stop piston (18) are fixedly connected by a self-locking nut (3).

4. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, A retaining ring (9) is provided on the piston connecting shaft (14) located at the axial rear end of the piston (10).

5. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, A gasket (6) is provided between the cylinder head (7) and the intermediate cylinder (4).

6. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, A metal retaining ring (15) is provided between the intermediate position cylinder (4) and the range stop cylinder (2).

7. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, A second gasket (16) is provided between the intermediate position cylinder (4) and the range stop cylinder (2).

8. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, A No. 2 O-ring (17) is fitted between the range stop piston (18) and the auxiliary gearbox shift fork shaft (1); a No. 3 O-ring (20) is fitted between the shift fork shaft through hole on the range stop cylinder (2) and the auxiliary gearbox shift fork shaft (1).

9. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, A No. 4 O-ring (11) is provided between the outer wall of the piston (10) located in the middle of the axis and the inner wall of the cylinder (4) in the middle position, and a No. 5 O-ring (12) is provided between the inner wall of the piston (10) and the piston connecting shaft (14).

10. The auxiliary cylinder assembly with an intermediate position cylinder as described in claim 1, characterized in that, A No. 6 O-ring (26) is provided between the inner wall of the piston (10) located at the axial front end and the piston connecting shaft (14), and a No. 7 O-ring (13) is provided between the piston connecting shaft (14) and the mounting hole on the intermediate position cylinder (4).

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