Gear shifting device of wheel excavator

Abstract

The utility model provides a gear shifting device of a wheel excavator, which aims at solving the problem of gear shifting failure caused by the fact that connection between an oil cylinder and a control rod of an existing mechanical transmission is easy to loosen under the vibration working condition, and improves reliability by improving a connecting structure and a sealing design. A metal locking nut and an elastic rubber top bolt are matched, and the concave cambered surface of the top head is in elastic contact with the threaded section of the control rod to restrain vibration loosening; the specific length-width ratio design of the second connecting hole compensates manufacturing and mounting errors; the end cover shaft sleeve is provided with a sealing ring to isolate pollutants and prevent oil leakage; the oil cylinder is welded with the groove of the mounting seat to ensure the axis positioning precision, and the structural performance is optimized by the weight-reducing through holes. The gear shifting stability and operation safety of the wheel excavator under complex working conditions are remarkably improved, connection looseness and transmission failure are effectively avoided, the service life of equipment is prolonged, and the gear shifting device meets the high-reliability requirement in the field of engineering machinery.

Description

TECHNICAL FIELD

[0001] The utility model relates to transmission gear shifting device technical field, concretely relates to a wheel excavator gear shifting device. BACKGROUND

[0002] The existing wheel excavator usually adopts mechanical transmission, a hydraulic drive transmission assembly (publication number CN220151816U) is a two-gear transmission with high low speed, the input shaft and the output shaft are rotationally connected in the transmission shell body, the input shaft is fixedly connected with the high-speed driving gear and the low-speed driving gear, the output shaft is rotationally connected with the high-speed driven gear meshing with the high-speed driving gear and the low-speed driven gear meshing with the low-speed driving gear, the output shaft is provided with a switching shaft sleeve between the high-speed and low-speed driven gears, and the high-speed or low-speed driven gears are fixedly connected with the output shaft through the switching shaft sleeve to realize gear shifting.

[0003] But some problems are found in the use process, because of the special working condition environment of the excavator, the transmission often has great vibration, the oil cylinder and the control rod are driven through a linkage plate, there is an adjusting gap between the control rod side and the control rod hole wall, and the vibration will make the bolts fixedly connecting the control rod and the linkage plate loose in the long-term use, so that the transmission cooperation between the oil cylinder and the control rod is not precise, gear shifting is not accurate, and even gear shifting fails. UTILITY MODEL CONTENTS

[0004] The utility model provides a wheel excavator gear shifting device can effectively solve the above -mentioned problem.

[0005] The utility model is realized as follows:

[0006] A wheel excavator gear shifting device, comprising:

[0007] End cover, be located in the casing of transmission;

[0008] Double piston rod oil cylinder, the double piston rod oil cylinder is fixed on the outside of casing through bolt, the double piston rod oil cylinder includes a piston rod;

[0009] Control rod, the control rod passes through the end cover and is located in the casing and can slide along the axial direction, the control rod still is fixed with a shift fork;

[0010] Connecting rod, one end of the connecting rod is provided with a first connecting hole matched with the piston rod, the other end of the connecting rod is provided with a second connecting hole matched with the control rod, the control rod has a gap with the hole wall of the second connecting hole, and the second connecting hole is a long slot hole, a threaded hole is further arranged on the end of the connecting rod close to the second connecting hole, the threaded hole is perpendicular to and communicates with the second connecting hole, a jack is matched with the threaded hole, and a fixing nut is arranged on the jack, the piston rod and the control rod are fixed with the connecting rod through nuts.

[0011] As a further improvement, the ratio of the width D of the second connecting hole to the diameter X of the connecting end of the control rod is 1.05-1.07:1, and the ratio of the width D to the length L of the second connecting hole is 1:1.15-1.2.

[0012] As a further improvement, the jack comprises a jack body and a top head, a connecting column is arranged on one end of the jack body, the top head is sleeved on the connecting column, and the top head can rotate, and the end of the top head away from the connecting column is an inner concave arc surface.

[0013] As a further improvement, the top head is made of high-temperature-resistant rubber material.

[0014] As a further improvement, the rubber material of the top head has a Shore hardness of 80-90 degrees.

[0015] As a further improvement, an axle sleeve is arranged on the end cover, the control rod passes through the axle sleeve, first and second sealing rings are arranged outside the axle sleeve, and a third sealing ring is arranged inside the axle sleeve.

[0016] As a further improvement, the piston rod and the control rod are fixed with the connecting rod through lock nuts.

[0017] As a further improvement, a mounting seat is arranged on the side surface of the double-piston-rod oil cylinder, a recess for placing the double-piston-rod oil cylinder is arranged on the mounting seat, the double-piston-rod oil cylinder is fixedly welded to the mounting seat, and the mounting seat is fixed to the housing of the transmission through bolts.

[0018] The beneficial effects of the utility model are:

[0019] On the basis of effectively compensating for manufacturing and installation errors, ensuring assembly convenience and maintaining connection strength, a jack is designed on the connecting rod to abut the connecting end of the control rod from the side, and the jack is tightened after installation, filling the one-sided gap in the length direction of the long slot hole, so that the connection structure is more stable, and the anti-loosening performance is stronger than that of the traditional rigid connection.

[0020] And the rubber top head with certain elasticity is adopted, the inner concave arc surface of the top head is in elastic contact with the threaded section of the control rod, and part of energy can be absorbed to reduce vibration displacement under the vibration environment;

[0021] Secondly, the end cover shaft sleeve adopts combined sealing ring design, forms multiple protective barriers, effectively prevents external pollutants from invading and prevents internal lubricating oil from leaking, and prolongs the service life of the device;

[0022] The device improves the above, significantly enhances the gear shifting stability and operation safety of the wheel excavator under complex working conditions, effectively avoids the problems of connection loosening and transmission failure caused by vibration, and guarantees long-term reliable operation of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 is a schematic diagram of the overall installation structure provided by the embodiments of the present application.

[0025] Figure 2 is an exploded view of the gear shifting device provided by the embodiments of the present application.

[0026] Figure 3 is a sectional view of the connecting rod in the installed state provided by the embodiments of the present application.

[0027] Figure 4 is a schematic diagram of the double-piston rod oil cylinder and the mounting seat structure provided by the embodiments of the present application.

[0028] Reference signs:

[0029] 1, shell; 2, end cover; 3, control rod; 4, connecting rod; 41, first connecting hole; 42, second connecting hole; 5, double-piston rod oil cylinder; 51, piston rod; 6, jackscrew; 61, jack body; 62, fixed nut; 63, top head; 7, shift fork; 8, mounting seat; 81, groove; 9, shaft sleeve; 91, first sealing ring; 92, second sealing ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only to represent selected embodiments of the present application.

[0031] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] Referring to Figures 1-4 As shown in FIG. 1, a gear shifting device of a wheel excavator is applied to a two-gear transmission. The transmission has a housing 1, an input shaft and an output shaft rotatably connected in the housing 1, a high-speed driving gear and a low-speed driving gear fixedly connected on the input shaft, a high-speed driven gear meshing with the high-speed driving gear and a low-speed driven gear meshing with the low-speed driving gear rotatably connected on the output shaft, and a switching shaft sleeve 9 arranged between the high-speed driven gear and the low-speed driven gear on the output shaft. The switching shaft sleeve 9 is used to form a fixed connection between the high-speed driven gear or the low-speed driven gear and the output shaft, so as to realize the switching of the gear position. The device provided by the present application comprises:

[0033] An end cover 2 is arranged on the housing 1 of the transmission;

[0034] A double-piston rod oil cylinder 5 is arranged outside the housing 1. The double-piston rod oil cylinder 5 comprises a piston rod 51.

[0035] A control rod 3 is arranged in the housing 1 and can slide axially through the end cover 2. A shift fork 7 is further fixed on the control rod 3. The shift fork 7 is used to shift the switching shaft sleeve 9.

[0036] The connecting rod 4 is provided with a first connecting hole 41 on one end of the connecting rod 4, which is assembled with the piston rod 51, and a second connecting hole 42 on the other end, which is assembled with the control rod 3. The control rod 3 has a gap with the hole wall of the second connecting hole 42, and the second connecting hole 42 is a long slot hole, which is to avoid the cumulative tolerance of the assembly position and manufacturing size of the piston rod 51 and the control rod 3, so that the connecting rod 4 cannot be installed. The connecting rod 4 is also provided with a threaded hole near one end of the second connecting hole 42, which is perpendicular to and communicates with the second connecting hole 42. A jack 6 is fitted in the threaded hole, and a fixing nut 62 is provided on the jack 6. The piston rod 51 and the control rod 3 are fixed with the connecting rod 4 by nuts. After the piston rod 51 is inserted into the first connecting hole 41 and fixed, the control rod 3 is inserted into the second connecting hole 42 and the jack 6 is tightened, so that the jack 6 abuts against the control rod 3 and locks the fixing nut 62 to fix the position of the jack 6, and then the nut is fixed. Four equidistant through holes are also provided on the side of the connecting rod 4 to reduce weight under the condition of ensuring structural strength.

[0037] Specifically, the structure of the second connecting hole 42 can adopt the following technical scheme: the ratio of the width D of the second connecting hole 42 to the diameter X of the connecting end of the control rod 3 is 1.05-1.07:1, and the ratio of the width D to the length L of the second connecting hole 42 is 1:1.1-1.2. Within this processing parameter, the connection strength of the second connecting hole 42 and the control rod 3 can be ensured not to be affected, and installation is also facilitated.

[0038] Specifically, the structure of the jack 6 can adopt the following technical scheme: the jack 6 includes a body 61 and a top head 63. A connecting column is provided on one end of the body 61, and the top head 63 is sleeved on the connecting column and can rotate. The end of the top head 63 away from the connecting column is an inner concave arc surface. The advantages are that the contact area of the top head 63 with the control rod 3 is larger, which can provide better support strength, and the top head 63 and the body 61 can rotate, so that the inner concave arc surface of the top head 63 always fits the side of the connecting rod 4 during the tightening of the jack 6.

[0039] Specifically, in order to better slow down and absorb vibration, the top head 63 is made of high-temperature-resistant rubber material. Since the connecting end of the control rod 3 has a long external thread on the side, the rubber material can better contact with it.

[0040] Specifically, the rubber material of the top head 63 is polyurethane, and the Shore hardness is 80-90 degrees, which can limit the deformation of the top head 63 and is not easy to deform greatly.

[0041] Specifically, in order to make the control rod 3 better slide through the end cover 2 and have better sealing, the end cover 2 is provided with a shaft sleeve 9, the control rod 3 passes through the shaft sleeve 9, the outer side of the shaft sleeve 9 is provided with a first sealing ring 91 and a second sealing ring 92, and the inner side is provided with a third sealing ring, the shaft sleeve 9 enables the control rod 3 to better slide through the end cover 2, the sealing ring can prevent impurities such as dust and oil stains from entering the inside of the transmission, at the same time, prevent the lubricating oil in the shell 1 from leaking, and ensure the normal work of the control rod 3 and the cleanliness of the inside of the transmission.

[0042] Specifically, in order to make the connection of the connecting rod 4 more stable and reliable, the piston rod 51 and the control rod 3 are both fixed with the connecting rod 4 by means of a lock nut, such as a nylon insert self-locking nut or a metal locking nut, and in the embodiment, the metal locking nut is preferably adopted, which realizes reliable anti-loosening effect through special thread design and metal elastic deformation.

[0043] Specifically, the double-piston rod oil cylinder 5 is provided with a mounting seat 8 on the side surface, the mounting seat 8 is integrally made of high-strength steel material, such as Q345, the mounting seat 8 is provided with a recess 81 for placing the double-piston rod oil cylinder 5, the depth and width of the recess 81 are accurately designed according to the outer diameter size of the double-piston rod oil cylinder 5, the depth ensures that there is a gap of 1-2 mm between the outer wall of the oil cylinder and the bottom of the recess 81 after the oil cylinder is placed, and a plurality of welding bevels are uniformly arranged on the two side walls of the recess 81 along the length direction, the angle of the bevel is 45°±5°, and the depth is 1 / 2-2 / 3 of the wall thickness of the mounting seat 8, the bevels are used for welding connection of the double-piston rod oil cylinder 5 and the mounting seat 8, the welding firmness and the strength of the welding seam can be ensured by reasonably arranging the bevels, the axial direction of the double-piston rod oil cylinder 5 can be better determined, the double-piston rod oil cylinder 5 is welded and fixed with the mounting seat 8, and the mounting seat 8 is fixed on the shell 1 of the transmission through bolts.

[0044] The preferred embodiments of the utility model are described above only, and are not used for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A shift device for a wheel excavator, characterized in that, The utility model relates to a kind of transmission control rod locking mechanism, including: End cover (2) is located on the shell (1) of transmission; Control rod (3), the control rod (3) is slidably arranged in shell (1) by passing through the end cover (2), and a shift fork (7) is further fixed on the control rod (3); Double piston rod oil cylinder (5), the double piston rod oil cylinder (5) is fixed outside shell (1) by bolt, and the double piston rod oil cylinder (5) includes a piston rod (51); Connecting rod (4), the first connecting hole (41) of being assembled with the piston rod (51) is arranged on one end of the connecting rod (4), the second connecting hole (42) of being assembled with the control rod (3) is arranged on the other end, the hole wall of the second connecting hole (42) has gap with the control rod (3), and the second connecting hole (42) is long slot hole, the threaded through hole close to one end of the second connecting hole (42) is further arranged on the connecting rod (4), the threaded through hole is perpendicular with the second connecting hole (42) and communicates, the threaded through hole is adapted to a jamb (6), a fixed nut (62) is arranged on the jamb (6), and the piston rod (51) and the control rod (3) are fixed with the connecting rod (4) using nut.

2. A gear shifting device for a wheel excavator according to claim 1, characterized in that The ratio of the width D of the second connecting hole (42) and the diameter X of the connecting end of the control rod (3) is 1.05-1.07:1, and the ratio of the width D and the length L of the second connecting hole (42) is 1:1.15-1.

2.

3. A gear shifting device for a wheel excavator according to claim 2, characterized in that The jamb (6) includes a plug body (61) and a top head (63), one end of the plug body (61) is provided with a connecting column, the top head (63) is sleeved on the connecting column, and the top head (63) can rotate, and the end of the top head (63) away from the connecting column is a concave arc surface.

4. A gear shifting device for a wheel excavator according to claim 3, characterized in that The top head (63) is made of high-temperature-resistant rubber material.

5. A gear shifting device for a wheel excavator according to claim 4, characterized in that The rubber material of the top head (63) has a Shore hardness of 80-90 degrees.

6. A shift device for a wheel excavator according to claim 1, characterized in that The end cover (2) is provided with a shaft sleeve (9), the control rod (3) passes through the shaft sleeve (9), the first sealing ring (91) and the second sealing ring (92) are arranged outside the shaft sleeve (9) at a distance, and the third sealing ring is arranged inside.

7. A shift device for a wheel excavator according to claim 1, characterized in that The piston rod (51) and the control rod (3) are fixed with the connecting rod (4) using lock nuts.

8. A shift device for a wheel excavator according to claim 1, characterized in that The double piston rod oil cylinder (5) is provided with a mounting seat (8) on the side, the mounting seat (8) is provided with a groove (81) for placing the double piston rod oil cylinder (5), the double piston rod oil cylinder (5) is welded and fixed with the mounting seat (8), and the mounting seat (8) is fixed on the shell (1) of transmission by bolt.

Images